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4928 строки
139 KiB
C
4928 строки
139 KiB
C
/* Extended regular expression matching and search library,
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version 0.12.
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(Implements POSIX draft P10003.2/D11.2, except for
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internationalization features.)
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Copyright (C) 1993 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* AIX requires this to be the first thing in the file. */
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#if defined (_AIX) && !defined (REGEX_MALLOC)
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#pragma alloca
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#endif
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#define _GNU_SOURCE
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/* We need this for `regex.h', and perhaps for the Emacs include files. */
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#include <sys/types.h>
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/* We used to test for `BSTRING' here, but only GCC and Emacs define
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`BSTRING', as far as I know, and neither of them use this code. */
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#include <string.h>
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#ifndef bcmp
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#define bcmp(s1, s2, n) memcmp ((s1), (s2), (n))
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#endif
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#ifndef bcopy
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#define bcopy(s, d, n) memcpy ((d), (s), (n))
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#endif
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#ifndef bzero
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#define bzero(s, n) memset ((s), 0, (n))
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#endif
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#include <stdlib.h>
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/* Define the syntax stuff for \<, \>, etc. */
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/* This must be nonzero for the wordchar and notwordchar pattern
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commands in re_match_2. */
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#ifndef Sword
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#define Sword 1
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#endif
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#ifdef SYNTAX_TABLE
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extern char *re_syntax_table;
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#else /* not SYNTAX_TABLE */
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/* How many characters in the character set. */
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#define CHAR_SET_SIZE 256
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static char re_syntax_table[CHAR_SET_SIZE];
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static void
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init_syntax_once ()
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{
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register int c;
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static int done = 0;
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if (done)
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return;
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bzero (re_syntax_table, sizeof re_syntax_table);
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for (c = 'a'; c <= 'z'; c++)
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re_syntax_table[c] = Sword;
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for (c = 'A'; c <= 'Z'; c++)
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re_syntax_table[c] = Sword;
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for (c = '0'; c <= '9'; c++)
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re_syntax_table[c] = Sword;
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re_syntax_table['_'] = Sword;
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done = 1;
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}
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#endif /* not SYNTAX_TABLE */
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#define SYNTAX(c) re_syntax_table[c]
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/* Get the interface, including the syntax bits. */
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#include "regex.h"
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/* isalpha etc. are used for the character classes. */
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#include <ctype.h>
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#ifndef isascii
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#define isascii(c) 1
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#endif
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#ifdef isblank
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#define ISBLANK(c) (isascii (c) && isblank (c))
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#else
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#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
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#endif
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#ifdef isgraph
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#define ISGRAPH(c) (isascii (c) && isgraph (c))
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#else
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#define ISGRAPH(c) (isascii (c) && isprint (c) && !isspace (c))
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#endif
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#define ISPRINT(c) (isascii (c) && isprint (c))
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#define ISDIGIT(c) (isascii (c) && isdigit (c))
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#define ISALNUM(c) (isascii (c) && isalnum (c))
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#define ISALPHA(c) (isascii (c) && isalpha (c))
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#define ISCNTRL(c) (isascii (c) && iscntrl (c))
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#define ISLOWER(c) (isascii (c) && islower (c))
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#define ISPUNCT(c) (isascii (c) && ispunct (c))
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#define ISSPACE(c) (isascii (c) && isspace (c))
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#define ISUPPER(c) (isascii (c) && isupper (c))
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#define ISXDIGIT(c) (isascii (c) && isxdigit (c))
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#ifndef NULL
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#define NULL 0
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#endif
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/* We remove any previous definition of `SIGN_EXTEND_CHAR',
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since ours (we hope) works properly with all combinations of
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machines, compilers, `char' and `unsigned char' argument types.
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(Per Bothner suggested the basic approach.) */
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#undef SIGN_EXTEND_CHAR
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#if __STDC__
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#define SIGN_EXTEND_CHAR(c) ((signed char) (c))
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#else /* not __STDC__ */
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/* As in Harbison and Steele. */
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#define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128)
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#endif
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/* Should we use malloc or alloca? If REGEX_MALLOC is not defined, we
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use `alloca' instead of `malloc'. This is because using malloc in
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re_search* or re_match* could cause memory leaks when C-g is used in
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Emacs; also, malloc is slower and causes storage fragmentation. On
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the other hand, malloc is more portable, and easier to debug.
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Because we sometimes use alloca, some routines have to be macros,
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not functions -- `alloca'-allocated space disappears at the end of the
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function it is called in. */
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#ifdef REGEX_MALLOC
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#define REGEX_ALLOCATE malloc
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#define REGEX_REALLOCATE(source, osize, nsize) realloc (source, nsize)
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#else /* not REGEX_MALLOC */
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/* Emacs already defines alloca, sometimes. */
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#ifndef alloca
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/* Make alloca work the best possible way. */
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#ifdef __GNUC__
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#define alloca __builtin_alloca
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#else /* not __GNUC__ */
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#if HAVE_ALLOCA_H
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#include <alloca.h>
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#else /* not __GNUC__ or HAVE_ALLOCA_H */
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#ifndef _AIX /* Already did AIX, up at the top. */
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char *alloca ();
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#endif /* not _AIX */
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#endif /* not HAVE_ALLOCA_H */
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#endif /* not __GNUC__ */
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#endif /* not alloca */
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#define REGEX_ALLOCATE alloca
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/* Assumes a `char *destination' variable. */
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#define REGEX_REALLOCATE(source, osize, nsize) \
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(destination = (char *) alloca (nsize), \
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bcopy (source, destination, osize), \
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destination)
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#endif /* not REGEX_MALLOC */
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/* True if `size1' is non-NULL and PTR is pointing anywhere inside
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`string1' or just past its end. This works if PTR is NULL, which is
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a good thing. */
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#define FIRST_STRING_P(ptr) \
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(size1 && string1 <= (ptr) && (ptr) <= string1 + size1)
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/* (Re)Allocate N items of type T using malloc, or fail. */
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#define TALLOC(n, t) ((t *) malloc ((n) * sizeof (t)))
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#define RETALLOC(addr, n, t) ((addr) = (t *) realloc (addr, (n) * sizeof (t)))
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#define REGEX_TALLOC(n, t) ((t *) REGEX_ALLOCATE ((n) * sizeof (t)))
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#define BYTEWIDTH 8 /* In bits. */
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#define STREQ(s1, s2) ((strcmp (s1, s2) == 0))
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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typedef char boolean;
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#define false 0
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#define true 1
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/* These are the command codes that appear in compiled regular
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expressions. Some opcodes are followed by argument bytes. A
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command code can specify any interpretation whatsoever for its
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arguments. Zero bytes may appear in the compiled regular expression.
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The value of `exactn' is needed in search.c (search_buffer) in Emacs.
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So regex.h defines a symbol `RE_EXACTN_VALUE' to be 1; the value of
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`exactn' we use here must also be 1. */
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typedef enum
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{
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no_op = 0,
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/* Followed by one byte giving n, then by n literal bytes. */
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exactn = 1,
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/* Matches any (more or less) character. */
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anychar,
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/* Matches any one char belonging to specified set. First
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following byte is number of bitmap bytes. Then come bytes
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for a bitmap saying which chars are in. Bits in each byte
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are ordered low-bit-first. A character is in the set if its
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bit is 1. A character too large to have a bit in the map is
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automatically not in the set. */
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charset,
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/* Same parameters as charset, but match any character that is
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not one of those specified. */
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charset_not,
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/* Start remembering the text that is matched, for storing in a
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register. Followed by one byte with the register number, in
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the range 0 to one less than the pattern buffer's re_nsub
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field. Then followed by one byte with the number of groups
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inner to this one. (This last has to be part of the
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start_memory only because we need it in the on_failure_jump
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of re_match_2.) */
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start_memory,
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/* Stop remembering the text that is matched and store it in a
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memory register. Followed by one byte with the register
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number, in the range 0 to one less than `re_nsub' in the
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pattern buffer, and one byte with the number of inner groups,
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just like `start_memory'. (We need the number of inner
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groups here because we don't have any easy way of finding the
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corresponding start_memory when we're at a stop_memory.) */
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stop_memory,
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/* Match a duplicate of something remembered. Followed by one
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byte containing the register number. */
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duplicate,
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/* Fail unless at beginning of line. */
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begline,
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/* Fail unless at end of line. */
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endline,
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/* Succeeds if at beginning of buffer (if emacs) or at beginning
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of string to be matched (if not). */
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begbuf,
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/* Analogously, for end of buffer/string. */
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endbuf,
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/* Followed by two byte relative address to which to jump. */
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jump,
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/* Same as jump, but marks the end of an alternative. */
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jump_past_alt,
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/* Followed by two-byte relative address of place to resume at
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in case of failure. */
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on_failure_jump,
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/* Like on_failure_jump, but pushes a placeholder instead of the
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current string position when executed. */
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on_failure_keep_string_jump,
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/* Throw away latest failure point and then jump to following
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two-byte relative address. */
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pop_failure_jump,
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/* Change to pop_failure_jump if know won't have to backtrack to
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match; otherwise change to jump. This is used to jump
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back to the beginning of a repeat. If what follows this jump
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clearly won't match what the repeat does, such that we can be
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sure that there is no use backtracking out of repetitions
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already matched, then we change it to a pop_failure_jump.
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Followed by two-byte address. */
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maybe_pop_jump,
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/* Jump to following two-byte address, and push a dummy failure
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point. This failure point will be thrown away if an attempt
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is made to use it for a failure. A `+' construct makes this
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before the first repeat. Also used as an intermediary kind
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of jump when compiling an alternative. */
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dummy_failure_jump,
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/* Push a dummy failure point and continue. Used at the end of
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alternatives. */
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push_dummy_failure,
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/* Followed by two-byte relative address and two-byte number n.
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After matching N times, jump to the address upon failure. */
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succeed_n,
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/* Followed by two-byte relative address, and two-byte number n.
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Jump to the address N times, then fail. */
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jump_n,
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/* Set the following two-byte relative address to the
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subsequent two-byte number. The address *includes* the two
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bytes of number. */
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set_number_at,
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wordchar, /* Matches any word-constituent character. */
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notwordchar, /* Matches any char that is not a word-constituent. */
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wordbeg, /* Succeeds if at word beginning. */
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wordend, /* Succeeds if at word end. */
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wordbound, /* Succeeds if at a word boundary. */
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notwordbound /* Succeeds if not at a word boundary. */
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#ifdef emacs
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,before_dot, /* Succeeds if before point. */
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at_dot, /* Succeeds if at point. */
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after_dot, /* Succeeds if after point. */
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/* Matches any character whose syntax is specified. Followed by
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a byte which contains a syntax code, e.g., Sword. */
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syntaxspec,
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/* Matches any character whose syntax is not that specified. */
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notsyntaxspec
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#endif /* emacs */
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} re_opcode_t;
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/* Common operations on the compiled pattern. */
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/* Store NUMBER in two contiguous bytes starting at DESTINATION. */
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#define STORE_NUMBER(destination, number) \
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do { \
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(destination)[0] = (number) & 0377; \
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(destination)[1] = (number) >> 8; \
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} while (0)
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/* Same as STORE_NUMBER, except increment DESTINATION to
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the byte after where the number is stored. Therefore, DESTINATION
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must be an lvalue. */
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#define STORE_NUMBER_AND_INCR(destination, number) \
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do { \
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STORE_NUMBER (destination, number); \
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(destination) += 2; \
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} while (0)
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/* Put into DESTINATION a number stored in two contiguous bytes starting
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at SOURCE. */
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#define EXTRACT_NUMBER(destination, source) \
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do { \
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(destination) = *(source) & 0377; \
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(destination) += SIGN_EXTEND_CHAR (*((source) + 1)) << 8; \
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} while (0)
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#ifdef DEBUG
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static void
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extract_number (dest, source)
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int *dest;
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unsigned char *source;
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{
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int temp = SIGN_EXTEND_CHAR (*(source + 1));
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*dest = *source & 0377;
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*dest += temp << 8;
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}
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#ifndef EXTRACT_MACROS /* To debug the macros. */
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#undef EXTRACT_NUMBER
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#define EXTRACT_NUMBER(dest, src) extract_number (&dest, src)
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#endif /* not EXTRACT_MACROS */
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#endif /* DEBUG */
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/* Same as EXTRACT_NUMBER, except increment SOURCE to after the number.
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SOURCE must be an lvalue. */
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#define EXTRACT_NUMBER_AND_INCR(destination, source) \
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do { \
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EXTRACT_NUMBER (destination, source); \
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(source) += 2; \
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} while (0)
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#ifdef DEBUG
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static void
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extract_number_and_incr (destination, source)
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int *destination;
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unsigned char **source;
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{
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extract_number (destination, *source);
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*source += 2;
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}
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#ifndef EXTRACT_MACROS
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#undef EXTRACT_NUMBER_AND_INCR
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#define EXTRACT_NUMBER_AND_INCR(dest, src) \
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extract_number_and_incr (&dest, &src)
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#endif /* not EXTRACT_MACROS */
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#endif /* DEBUG */
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/* If DEBUG is defined, Regex prints many voluminous messages about what
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it is doing (if the variable `debug' is nonzero). If linked with the
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main program in `iregex.c', you can enter patterns and strings
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interactively. And if linked with the main program in `main.c' and
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the other test files, you can run the already-written tests. */
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#ifdef DEBUG
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/* We use standard I/O for debugging. */
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#include <stdio.h>
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/* It is useful to test things that ``must'' be true when debugging. */
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#include <assert.h>
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static int debug = 0;
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#define DEBUG_STATEMENT(e) e
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#define DEBUG_PRINT1(x) if (debug) printf (x)
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#define DEBUG_PRINT2(x1, x2) if (debug) printf (x1, x2)
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#define DEBUG_PRINT3(x1, x2, x3) if (debug) printf (x1, x2, x3)
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#define DEBUG_PRINT4(x1, x2, x3, x4) if (debug) printf (x1, x2, x3, x4)
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#define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) \
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if (debug) print_partial_compiled_pattern (s, e)
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#define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) \
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if (debug) print_double_string (w, s1, sz1, s2, sz2)
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extern void printchar ();
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/* Print the fastmap in human-readable form. */
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void
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print_fastmap (fastmap)
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char *fastmap;
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{
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unsigned was_a_range = 0;
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unsigned i = 0;
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while (i < (1 << BYTEWIDTH))
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{
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if (fastmap[i++])
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{
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was_a_range = 0;
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printchar (i - 1);
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while (i < (1 << BYTEWIDTH) && fastmap[i])
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{
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was_a_range = 1;
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i++;
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}
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if (was_a_range)
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{
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printf ("-");
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printchar (i - 1);
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}
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}
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}
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putchar ('\n');
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}
|
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|
||
|
||
/* Print a compiled pattern string in human-readable form, starting at
|
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the START pointer into it and ending just before the pointer END. */
|
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void
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print_partial_compiled_pattern (start, end)
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unsigned char *start;
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unsigned char *end;
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{
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int mcnt, mcnt2;
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unsigned char *p = start;
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unsigned char *pend = end;
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if (start == NULL)
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{
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printf ("(null)\n");
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return;
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}
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/* Loop over pattern commands. */
|
||
while (p < pend)
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{
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switch ((re_opcode_t) *p++)
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{
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case no_op:
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printf ("/no_op");
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break;
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case exactn:
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mcnt = *p++;
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printf ("/exactn/%d", mcnt);
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do
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{
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putchar ('/');
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printchar (*p++);
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}
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while (--mcnt);
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break;
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case start_memory:
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mcnt = *p++;
|
||
printf ("/start_memory/%d/%d", mcnt, *p++);
|
||
break;
|
||
|
||
case stop_memory:
|
||
mcnt = *p++;
|
||
printf ("/stop_memory/%d/%d", mcnt, *p++);
|
||
break;
|
||
|
||
case duplicate:
|
||
printf ("/duplicate/%d", *p++);
|
||
break;
|
||
|
||
case anychar:
|
||
printf ("/anychar");
|
||
break;
|
||
|
||
case charset:
|
||
case charset_not:
|
||
{
|
||
register int c;
|
||
|
||
printf ("/charset%s",
|
||
(re_opcode_t) *(p - 1) == charset_not ? "_not" : "");
|
||
|
||
assert (p + *p < pend);
|
||
|
||
for (c = 0; c < *p; c++)
|
||
{
|
||
unsigned bit;
|
||
unsigned char map_byte = p[1 + c];
|
||
|
||
putchar ('/');
|
||
|
||
for (bit = 0; bit < BYTEWIDTH; bit++)
|
||
if (map_byte & (1 << bit))
|
||
printchar (c * BYTEWIDTH + bit);
|
||
}
|
||
p += 1 + *p;
|
||
break;
|
||
}
|
||
|
||
case begline:
|
||
printf ("/begline");
|
||
break;
|
||
|
||
case endline:
|
||
printf ("/endline");
|
||
break;
|
||
|
||
case on_failure_jump:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
printf ("/on_failure_jump/0/%d", mcnt);
|
||
break;
|
||
|
||
case on_failure_keep_string_jump:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
printf ("/on_failure_keep_string_jump/0/%d", mcnt);
|
||
break;
|
||
|
||
case dummy_failure_jump:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
printf ("/dummy_failure_jump/0/%d", mcnt);
|
||
break;
|
||
|
||
case push_dummy_failure:
|
||
printf ("/push_dummy_failure");
|
||
break;
|
||
|
||
case maybe_pop_jump:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
printf ("/maybe_pop_jump/0/%d", mcnt);
|
||
break;
|
||
|
||
case pop_failure_jump:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
printf ("/pop_failure_jump/0/%d", mcnt);
|
||
break;
|
||
|
||
case jump_past_alt:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
printf ("/jump_past_alt/0/%d", mcnt);
|
||
break;
|
||
|
||
case jump:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
printf ("/jump/0/%d", mcnt);
|
||
break;
|
||
|
||
case succeed_n:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
extract_number_and_incr (&mcnt2, &p);
|
||
printf ("/succeed_n/0/%d/0/%d", mcnt, mcnt2);
|
||
break;
|
||
|
||
case jump_n:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
extract_number_and_incr (&mcnt2, &p);
|
||
printf ("/jump_n/0/%d/0/%d", mcnt, mcnt2);
|
||
break;
|
||
|
||
case set_number_at:
|
||
extract_number_and_incr (&mcnt, &p);
|
||
extract_number_and_incr (&mcnt2, &p);
|
||
printf ("/set_number_at/0/%d/0/%d", mcnt, mcnt2);
|
||
break;
|
||
|
||
case wordbound:
|
||
printf ("/wordbound");
|
||
break;
|
||
|
||
case notwordbound:
|
||
printf ("/notwordbound");
|
||
break;
|
||
|
||
case wordbeg:
|
||
printf ("/wordbeg");
|
||
break;
|
||
|
||
case wordend:
|
||
printf ("/wordend");
|
||
|
||
#ifdef emacs
|
||
case before_dot:
|
||
printf ("/before_dot");
|
||
break;
|
||
|
||
case at_dot:
|
||
printf ("/at_dot");
|
||
break;
|
||
|
||
case after_dot:
|
||
printf ("/after_dot");
|
||
break;
|
||
|
||
case syntaxspec:
|
||
printf ("/syntaxspec");
|
||
mcnt = *p++;
|
||
printf ("/%d", mcnt);
|
||
break;
|
||
|
||
case notsyntaxspec:
|
||
printf ("/notsyntaxspec");
|
||
mcnt = *p++;
|
||
printf ("/%d", mcnt);
|
||
break;
|
||
#endif /* emacs */
|
||
|
||
case wordchar:
|
||
printf ("/wordchar");
|
||
break;
|
||
|
||
case notwordchar:
|
||
printf ("/notwordchar");
|
||
break;
|
||
|
||
case begbuf:
|
||
printf ("/begbuf");
|
||
break;
|
||
|
||
case endbuf:
|
||
printf ("/endbuf");
|
||
break;
|
||
|
||
default:
|
||
printf ("?%d", *(p-1));
|
||
}
|
||
}
|
||
printf ("/\n");
|
||
}
|
||
|
||
|
||
void
|
||
print_compiled_pattern (bufp)
|
||
struct re_pattern_buffer *bufp;
|
||
{
|
||
unsigned char *buffer = bufp->buffer;
|
||
|
||
print_partial_compiled_pattern (buffer, buffer + bufp->used);
|
||
printf ("%d bytes used/%d bytes allocated.\n", bufp->used, bufp->allocated);
|
||
|
||
if (bufp->fastmap_accurate && bufp->fastmap)
|
||
{
|
||
printf ("fastmap: ");
|
||
print_fastmap (bufp->fastmap);
|
||
}
|
||
|
||
printf ("re_nsub: %d\t", bufp->re_nsub);
|
||
printf ("regs_alloc: %d\t", bufp->regs_allocated);
|
||
printf ("can_be_null: %d\t", bufp->can_be_null);
|
||
printf ("newline_anchor: %d\n", bufp->newline_anchor);
|
||
printf ("no_sub: %d\t", bufp->no_sub);
|
||
printf ("not_bol: %d\t", bufp->not_bol);
|
||
printf ("not_eol: %d\t", bufp->not_eol);
|
||
printf ("syntax: %d\n", bufp->syntax);
|
||
/* Perhaps we should print the translate table? */
|
||
}
|
||
|
||
|
||
void
|
||
print_double_string (where, string1, size1, string2, size2)
|
||
const char *where;
|
||
const char *string1;
|
||
const char *string2;
|
||
int size1;
|
||
int size2;
|
||
{
|
||
unsigned this_char;
|
||
|
||
if (where == NULL)
|
||
printf ("(null)");
|
||
else
|
||
{
|
||
if (FIRST_STRING_P (where))
|
||
{
|
||
for (this_char = where - string1; this_char < size1; this_char++)
|
||
printchar (string1[this_char]);
|
||
|
||
where = string2;
|
||
}
|
||
|
||
for (this_char = where - string2; this_char < size2; this_char++)
|
||
printchar (string2[this_char]);
|
||
}
|
||
}
|
||
|
||
#else /* not DEBUG */
|
||
|
||
#undef assert
|
||
#define assert(e)
|
||
|
||
#define DEBUG_STATEMENT(e)
|
||
#define DEBUG_PRINT1(x)
|
||
#define DEBUG_PRINT2(x1, x2)
|
||
#define DEBUG_PRINT3(x1, x2, x3)
|
||
#define DEBUG_PRINT4(x1, x2, x3, x4)
|
||
#define DEBUG_PRINT_COMPILED_PATTERN(p, s, e)
|
||
#define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2)
|
||
|
||
#endif /* not DEBUG */
|
||
|
||
/* Set by `re_set_syntax' to the current regexp syntax to recognize. Can
|
||
also be assigned to arbitrarily: each pattern buffer stores its own
|
||
syntax, so it can be changed between regex compilations. */
|
||
reg_syntax_t re_syntax_options = RE_SYNTAX_EMACS;
|
||
|
||
|
||
/* Specify the precise syntax of regexps for compilation. This provides
|
||
for compatibility for various utilities which historically have
|
||
different, incompatible syntaxes.
|
||
|
||
The argument SYNTAX is a bit mask comprised of the various bits
|
||
defined in regex.h. We return the old syntax. */
|
||
|
||
reg_syntax_t
|
||
re_set_syntax (syntax)
|
||
reg_syntax_t syntax;
|
||
{
|
||
reg_syntax_t ret = re_syntax_options;
|
||
|
||
re_syntax_options = syntax;
|
||
return ret;
|
||
}
|
||
|
||
/* This table gives an error message for each of the error codes listed
|
||
in regex.h. Obviously the order here has to be same as there. */
|
||
|
||
static const char *re_error_msg[] =
|
||
{ NULL, /* REG_NOERROR */
|
||
"No match", /* REG_NOMATCH */
|
||
"Invalid regular expression", /* REG_BADPAT */
|
||
"Invalid collation character", /* REG_ECOLLATE */
|
||
"Invalid character class name", /* REG_ECTYPE */
|
||
"Trailing backslash", /* REG_EESCAPE */
|
||
"Invalid back reference", /* REG_ESUBREG */
|
||
"Unmatched [ or [^", /* REG_EBRACK */
|
||
"Unmatched ( or \\(", /* REG_EPAREN */
|
||
"Unmatched \\{", /* REG_EBRACE */
|
||
"Invalid content of \\{\\}", /* REG_BADBR */
|
||
"Invalid range end", /* REG_ERANGE */
|
||
"Memory exhausted", /* REG_ESPACE */
|
||
"Invalid preceding regular expression", /* REG_BADRPT */
|
||
"Premature end of regular expression", /* REG_EEND */
|
||
"Regular expression too big", /* REG_ESIZE */
|
||
"Unmatched ) or \\)", /* REG_ERPAREN */
|
||
};
|
||
|
||
/* Subroutine declarations and macros for regex_compile. */
|
||
|
||
static void store_op1 (), store_op2 ();
|
||
static void insert_op1 (), insert_op2 ();
|
||
static boolean at_begline_loc_p (), at_endline_loc_p ();
|
||
static boolean group_in_compile_stack ();
|
||
static reg_errcode_t compile_range ();
|
||
|
||
/* Fetch the next character in the uncompiled pattern---translating it
|
||
if necessary. Also cast from a signed character in the constant
|
||
string passed to us by the user to an unsigned char that we can use
|
||
as an array index (in, e.g., `translate'). */
|
||
#define PATFETCH(c) \
|
||
do {if (p == pend) return REG_EEND; \
|
||
c = (unsigned char) *p++; \
|
||
if (translate) c = translate[c]; \
|
||
} while (0)
|
||
|
||
/* Fetch the next character in the uncompiled pattern, with no
|
||
translation. */
|
||
#define PATFETCH_RAW(c) \
|
||
do {if (p == pend) return REG_EEND; \
|
||
c = (unsigned char) *p++; \
|
||
} while (0)
|
||
|
||
/* Go backwards one character in the pattern. */
|
||
#define PATUNFETCH p--
|
||
|
||
|
||
/* If `translate' is non-null, return translate[D], else just D. We
|
||
cast the subscript to translate because some data is declared as
|
||
`char *', to avoid warnings when a string constant is passed. But
|
||
when we use a character as a subscript we must make it unsigned. */
|
||
#define TRANSLATE(d) (translate ? translate[(unsigned char) (d)] : (d))
|
||
|
||
|
||
/* Macros for outputting the compiled pattern into `buffer'. */
|
||
|
||
/* If the buffer isn't allocated when it comes in, use this. */
|
||
#define INIT_BUF_SIZE 32
|
||
|
||
/* Make sure we have at least N more bytes of space in buffer. */
|
||
#define GET_BUFFER_SPACE(n) \
|
||
while (b - bufp->buffer + (n) > bufp->allocated) \
|
||
EXTEND_BUFFER ()
|
||
|
||
/* Make sure we have one more byte of buffer space and then add C to it. */
|
||
#define BUF_PUSH(c) \
|
||
do { \
|
||
GET_BUFFER_SPACE (1); \
|
||
*b++ = (unsigned char) (c); \
|
||
} while (0)
|
||
|
||
|
||
/* Ensure we have two more bytes of buffer space and then append C1 and C2. */
|
||
#define BUF_PUSH_2(c1, c2) \
|
||
do { \
|
||
GET_BUFFER_SPACE (2); \
|
||
*b++ = (unsigned char) (c1); \
|
||
*b++ = (unsigned char) (c2); \
|
||
} while (0)
|
||
|
||
|
||
/* As with BUF_PUSH_2, except for three bytes. */
|
||
#define BUF_PUSH_3(c1, c2, c3) \
|
||
do { \
|
||
GET_BUFFER_SPACE (3); \
|
||
*b++ = (unsigned char) (c1); \
|
||
*b++ = (unsigned char) (c2); \
|
||
*b++ = (unsigned char) (c3); \
|
||
} while (0)
|
||
|
||
|
||
/* Store a jump with opcode OP at LOC to location TO. We store a
|
||
relative address offset by the three bytes the jump itself occupies. */
|
||
#define STORE_JUMP(op, loc, to) \
|
||
store_op1 (op, loc, (to) - (loc) - 3)
|
||
|
||
/* Likewise, for a two-argument jump. */
|
||
#define STORE_JUMP2(op, loc, to, arg) \
|
||
store_op2 (op, loc, (to) - (loc) - 3, arg)
|
||
|
||
/* Like `STORE_JUMP', but for inserting. Assume `b' is the buffer end. */
|
||
#define INSERT_JUMP(op, loc, to) \
|
||
insert_op1 (op, loc, (to) - (loc) - 3, b)
|
||
|
||
/* Like `STORE_JUMP2', but for inserting. Assume `b' is the buffer end. */
|
||
#define INSERT_JUMP2(op, loc, to, arg) \
|
||
insert_op2 (op, loc, (to) - (loc) - 3, arg, b)
|
||
|
||
|
||
/* This is not an arbitrary limit: the arguments which represent offsets
|
||
into the pattern are two bytes long. So if 2^16 bytes turns out to
|
||
be too small, many things would have to change. */
|
||
#define MAX_BUF_SIZE (1L << 16)
|
||
|
||
|
||
/* Extend the buffer by twice its current size via realloc and
|
||
reset the pointers that pointed into the old block to point to the
|
||
correct places in the new one. If extending the buffer results in it
|
||
being larger than MAX_BUF_SIZE, then flag memory exhausted. */
|
||
#define EXTEND_BUFFER() \
|
||
do { \
|
||
unsigned char *old_buffer = bufp->buffer; \
|
||
if (bufp->allocated == MAX_BUF_SIZE) \
|
||
return REG_ESIZE; \
|
||
bufp->allocated <<= 1; \
|
||
if (bufp->allocated > MAX_BUF_SIZE) \
|
||
bufp->allocated = MAX_BUF_SIZE; \
|
||
bufp->buffer = (unsigned char *) realloc (bufp->buffer, bufp->allocated);\
|
||
if (bufp->buffer == NULL) \
|
||
return REG_ESPACE; \
|
||
/* If the buffer moved, move all the pointers into it. */ \
|
||
if (old_buffer != bufp->buffer) \
|
||
{ \
|
||
b = (b - old_buffer) + bufp->buffer; \
|
||
begalt = (begalt - old_buffer) + bufp->buffer; \
|
||
if (fixup_alt_jump) \
|
||
fixup_alt_jump = (fixup_alt_jump - old_buffer) + bufp->buffer;\
|
||
if (laststart) \
|
||
laststart = (laststart - old_buffer) + bufp->buffer; \
|
||
if (pending_exact) \
|
||
pending_exact = (pending_exact - old_buffer) + bufp->buffer; \
|
||
} \
|
||
} while (0)
|
||
|
||
|
||
/* Since we have one byte reserved for the register number argument to
|
||
{start,stop}_memory, the maximum number of groups we can report
|
||
things about is what fits in that byte. */
|
||
#define MAX_REGNUM 255
|
||
|
||
/* But patterns can have more than `MAX_REGNUM' registers. We just
|
||
ignore the excess. */
|
||
typedef unsigned regnum_t;
|
||
|
||
|
||
/* Macros for the compile stack. */
|
||
|
||
/* Since offsets can go either forwards or backwards, this type needs to
|
||
be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1. */
|
||
typedef int pattern_offset_t;
|
||
|
||
typedef struct
|
||
{
|
||
pattern_offset_t begalt_offset;
|
||
pattern_offset_t fixup_alt_jump;
|
||
pattern_offset_t inner_group_offset;
|
||
pattern_offset_t laststart_offset;
|
||
regnum_t regnum;
|
||
} compile_stack_elt_t;
|
||
|
||
|
||
typedef struct
|
||
{
|
||
compile_stack_elt_t *stack;
|
||
unsigned size;
|
||
unsigned avail; /* Offset of next open position. */
|
||
} compile_stack_type;
|
||
|
||
|
||
#define INIT_COMPILE_STACK_SIZE 32
|
||
|
||
#define COMPILE_STACK_EMPTY (compile_stack.avail == 0)
|
||
#define COMPILE_STACK_FULL (compile_stack.avail == compile_stack.size)
|
||
|
||
/* The next available element. */
|
||
#define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail])
|
||
|
||
|
||
/* Set the bit for character C in a list. */
|
||
#define SET_LIST_BIT(c) \
|
||
(b[((unsigned char) (c)) / BYTEWIDTH] \
|
||
|= 1 << (((unsigned char) c) % BYTEWIDTH))
|
||
|
||
|
||
/* Get the next unsigned number in the uncompiled pattern. */
|
||
#define GET_UNSIGNED_NUMBER(num) \
|
||
{ if (p != pend) \
|
||
{ \
|
||
PATFETCH (c); \
|
||
while (ISDIGIT (c)) \
|
||
{ \
|
||
if (num < 0) \
|
||
num = 0; \
|
||
num = num * 10 + c - '0'; \
|
||
if (p == pend) \
|
||
break; \
|
||
PATFETCH (c); \
|
||
} \
|
||
} \
|
||
}
|
||
|
||
#define CHAR_CLASS_MAX_LENGTH 6 /* Namely, `xdigit'. */
|
||
|
||
#define IS_CHAR_CLASS(string) \
|
||
(STREQ (string, "alpha") || STREQ (string, "upper") \
|
||
|| STREQ (string, "lower") || STREQ (string, "digit") \
|
||
|| STREQ (string, "alnum") || STREQ (string, "xdigit") \
|
||
|| STREQ (string, "space") || STREQ (string, "print") \
|
||
|| STREQ (string, "punct") || STREQ (string, "graph") \
|
||
|| STREQ (string, "cntrl") || STREQ (string, "blank"))
|
||
|
||
/* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX.
|
||
Returns one of error codes defined in `regex.h', or zero for success.
|
||
|
||
Assumes the `allocated' (and perhaps `buffer') and `translate'
|
||
fields are set in BUFP on entry.
|
||
|
||
If it succeeds, results are put in BUFP (if it returns an error, the
|
||
contents of BUFP are undefined):
|
||
`buffer' is the compiled pattern;
|
||
`syntax' is set to SYNTAX;
|
||
`used' is set to the length of the compiled pattern;
|
||
`fastmap_accurate' is zero;
|
||
`re_nsub' is the number of subexpressions in PATTERN;
|
||
`not_bol' and `not_eol' are zero;
|
||
|
||
The `fastmap' and `newline_anchor' fields are neither
|
||
examined nor set. */
|
||
|
||
static reg_errcode_t
|
||
regex_compile (pattern, size, syntax, bufp)
|
||
const char *pattern;
|
||
int size;
|
||
reg_syntax_t syntax;
|
||
struct re_pattern_buffer *bufp;
|
||
{
|
||
/* We fetch characters from PATTERN here. Even though PATTERN is
|
||
`char *' (i.e., signed), we declare these variables as unsigned, so
|
||
they can be reliably used as array indices. */
|
||
register unsigned char c, c1;
|
||
|
||
/* A random tempory spot in PATTERN. */
|
||
const char *p1;
|
||
|
||
/* Points to the end of the buffer, where we should append. */
|
||
register unsigned char *b;
|
||
|
||
/* Keeps track of unclosed groups. */
|
||
compile_stack_type compile_stack;
|
||
|
||
/* Points to the current (ending) position in the pattern. */
|
||
const char *p = pattern;
|
||
const char *pend = pattern + size;
|
||
|
||
/* How to translate the characters in the pattern. */
|
||
char *translate = bufp->translate;
|
||
|
||
/* Address of the count-byte of the most recently inserted `exactn'
|
||
command. This makes it possible to tell if a new exact-match
|
||
character can be added to that command or if the character requires
|
||
a new `exactn' command. */
|
||
unsigned char *pending_exact = 0;
|
||
|
||
/* Address of start of the most recently finished expression.
|
||
This tells, e.g., postfix * where to find the start of its
|
||
operand. Reset at the beginning of groups and alternatives. */
|
||
unsigned char *laststart = 0;
|
||
|
||
/* Address of beginning of regexp, or inside of last group. */
|
||
unsigned char *begalt;
|
||
|
||
/* Place in the uncompiled pattern (i.e., the {) to
|
||
which to go back if the interval is invalid. */
|
||
const char *beg_interval;
|
||
|
||
/* Address of the place where a forward jump should go to the end of
|
||
the containing expression. Each alternative of an `or' -- except the
|
||
last -- ends with a forward jump of this sort. */
|
||
unsigned char *fixup_alt_jump = 0;
|
||
|
||
/* Counts open-groups as they are encountered. Remembered for the
|
||
matching close-group on the compile stack, so the same register
|
||
number is put in the stop_memory as the start_memory. */
|
||
regnum_t regnum = 0;
|
||
|
||
#ifdef DEBUG
|
||
DEBUG_PRINT1 ("\nCompiling pattern: ");
|
||
if (debug)
|
||
{
|
||
unsigned debug_count;
|
||
|
||
for (debug_count = 0; debug_count < size; debug_count++)
|
||
printchar (pattern[debug_count]);
|
||
putchar ('\n');
|
||
}
|
||
#endif /* DEBUG */
|
||
|
||
/* Initialize the compile stack. */
|
||
compile_stack.stack = TALLOC (INIT_COMPILE_STACK_SIZE, compile_stack_elt_t);
|
||
if (compile_stack.stack == NULL)
|
||
return REG_ESPACE;
|
||
|
||
compile_stack.size = INIT_COMPILE_STACK_SIZE;
|
||
compile_stack.avail = 0;
|
||
|
||
/* Initialize the pattern buffer. */
|
||
bufp->syntax = syntax;
|
||
bufp->fastmap_accurate = 0;
|
||
bufp->not_bol = bufp->not_eol = 0;
|
||
|
||
/* Set `used' to zero, so that if we return an error, the pattern
|
||
printer (for debugging) will think there's no pattern. We reset it
|
||
at the end. */
|
||
bufp->used = 0;
|
||
|
||
/* Always count groups, whether or not bufp->no_sub is set. */
|
||
bufp->re_nsub = 0;
|
||
|
||
#if !defined (emacs) && !defined (SYNTAX_TABLE)
|
||
/* Initialize the syntax table. */
|
||
init_syntax_once ();
|
||
#endif
|
||
|
||
if (bufp->allocated == 0)
|
||
{
|
||
if (bufp->buffer)
|
||
{ /* If zero allocated, but buffer is non-null, try to realloc
|
||
enough space. This loses if buffer's address is bogus, but
|
||
that is the user's responsibility. */
|
||
RETALLOC (bufp->buffer, INIT_BUF_SIZE, unsigned char);
|
||
}
|
||
else
|
||
{ /* Caller did not allocate a buffer. Do it for them. */
|
||
bufp->buffer = TALLOC (INIT_BUF_SIZE, unsigned char);
|
||
}
|
||
if (!bufp->buffer) return REG_ESPACE;
|
||
|
||
bufp->allocated = INIT_BUF_SIZE;
|
||
}
|
||
|
||
begalt = b = bufp->buffer;
|
||
|
||
/* Loop through the uncompiled pattern until we're at the end. */
|
||
while (p != pend)
|
||
{
|
||
PATFETCH (c);
|
||
|
||
switch (c)
|
||
{
|
||
case '^':
|
||
{
|
||
if ( /* If at start of pattern, it's an operator. */
|
||
p == pattern + 1
|
||
/* If context independent, it's an operator. */
|
||
|| syntax & RE_CONTEXT_INDEP_ANCHORS
|
||
/* Otherwise, depends on what's come before. */
|
||
|| at_begline_loc_p (pattern, p, syntax))
|
||
BUF_PUSH (begline);
|
||
else
|
||
goto normal_char;
|
||
}
|
||
break;
|
||
|
||
|
||
case '$':
|
||
{
|
||
if ( /* If at end of pattern, it's an operator. */
|
||
p == pend
|
||
/* If context independent, it's an operator. */
|
||
|| syntax & RE_CONTEXT_INDEP_ANCHORS
|
||
/* Otherwise, depends on what's next. */
|
||
|| at_endline_loc_p (p, pend, syntax))
|
||
BUF_PUSH (endline);
|
||
else
|
||
goto normal_char;
|
||
}
|
||
break;
|
||
|
||
|
||
case '+':
|
||
case '?':
|
||
if ((syntax & RE_BK_PLUS_QM)
|
||
|| (syntax & RE_LIMITED_OPS))
|
||
goto normal_char;
|
||
handle_plus:
|
||
case '*':
|
||
/* If there is no previous pattern... */
|
||
if (!laststart)
|
||
{
|
||
if (syntax & RE_CONTEXT_INVALID_OPS)
|
||
return REG_BADRPT;
|
||
else if (!(syntax & RE_CONTEXT_INDEP_OPS))
|
||
goto normal_char;
|
||
}
|
||
|
||
{
|
||
/* Are we optimizing this jump? */
|
||
boolean keep_string_p = false;
|
||
|
||
/* 1 means zero (many) matches is allowed. */
|
||
char zero_times_ok = 0, many_times_ok = 0;
|
||
|
||
/* If there is a sequence of repetition chars, collapse it
|
||
down to just one (the right one). We can't combine
|
||
interval operators with these because of, e.g., `a{2}*',
|
||
which should only match an even number of `a's. */
|
||
|
||
for (;;)
|
||
{
|
||
zero_times_ok |= c != '+';
|
||
many_times_ok |= c != '?';
|
||
|
||
if (p == pend)
|
||
break;
|
||
|
||
PATFETCH (c);
|
||
|
||
if (c == '*'
|
||
|| (!(syntax & RE_BK_PLUS_QM) && (c == '+' || c == '?')))
|
||
;
|
||
|
||
else if (syntax & RE_BK_PLUS_QM && c == '\\')
|
||
{
|
||
if (p == pend) return REG_EESCAPE;
|
||
|
||
PATFETCH (c1);
|
||
if (!(c1 == '+' || c1 == '?'))
|
||
{
|
||
PATUNFETCH;
|
||
PATUNFETCH;
|
||
break;
|
||
}
|
||
|
||
c = c1;
|
||
}
|
||
else
|
||
{
|
||
PATUNFETCH;
|
||
break;
|
||
}
|
||
|
||
/* If we get here, we found another repeat character. */
|
||
}
|
||
|
||
/* Star, etc. applied to an empty pattern is equivalent
|
||
to an empty pattern. */
|
||
if (!laststart)
|
||
break;
|
||
|
||
/* Now we know whether or not zero matches is allowed
|
||
and also whether or not two or more matches is allowed. */
|
||
if (many_times_ok)
|
||
{ /* More than one repetition is allowed, so put in at the
|
||
end a backward relative jump from `b' to before the next
|
||
jump we're going to put in below (which jumps from
|
||
laststart to after this jump).
|
||
|
||
But if we are at the `*' in the exact sequence `.*\n',
|
||
insert an unconditional jump backwards to the .,
|
||
instead of the beginning of the loop. This way we only
|
||
push a failure point once, instead of every time
|
||
through the loop. */
|
||
assert (p - 1 > pattern);
|
||
|
||
/* Allocate the space for the jump. */
|
||
GET_BUFFER_SPACE (3);
|
||
|
||
/* We know we are not at the first character of the pattern,
|
||
because laststart was nonzero. And we've already
|
||
incremented `p', by the way, to be the character after
|
||
the `*'. Do we have to do something analogous here
|
||
for null bytes, because of RE_DOT_NOT_NULL? */
|
||
if (TRANSLATE (*(p - 2)) == TRANSLATE ('.')
|
||
&& zero_times_ok
|
||
&& p < pend && TRANSLATE (*p) == TRANSLATE ('\n')
|
||
&& !(syntax & RE_DOT_NEWLINE))
|
||
{ /* We have .*\n. */
|
||
STORE_JUMP (jump, b, laststart);
|
||
keep_string_p = true;
|
||
}
|
||
else
|
||
/* Anything else. */
|
||
STORE_JUMP (maybe_pop_jump, b, laststart - 3);
|
||
|
||
/* We've added more stuff to the buffer. */
|
||
b += 3;
|
||
}
|
||
|
||
/* On failure, jump from laststart to b + 3, which will be the
|
||
end of the buffer after this jump is inserted. */
|
||
GET_BUFFER_SPACE (3);
|
||
INSERT_JUMP (keep_string_p ? on_failure_keep_string_jump
|
||
: on_failure_jump,
|
||
laststart, b + 3);
|
||
pending_exact = 0;
|
||
b += 3;
|
||
|
||
if (!zero_times_ok)
|
||
{
|
||
/* At least one repetition is required, so insert a
|
||
`dummy_failure_jump' before the initial
|
||
`on_failure_jump' instruction of the loop. This
|
||
effects a skip over that instruction the first time
|
||
we hit that loop. */
|
||
GET_BUFFER_SPACE (3);
|
||
INSERT_JUMP (dummy_failure_jump, laststart, laststart + 6);
|
||
b += 3;
|
||
}
|
||
}
|
||
break;
|
||
|
||
|
||
case '.':
|
||
laststart = b;
|
||
BUF_PUSH (anychar);
|
||
break;
|
||
|
||
|
||
case '[':
|
||
{
|
||
boolean had_char_class = false;
|
||
|
||
if (p == pend) return REG_EBRACK;
|
||
|
||
/* Ensure that we have enough space to push a charset: the
|
||
opcode, the length count, and the bitset; 34 bytes in all. */
|
||
GET_BUFFER_SPACE (34);
|
||
|
||
laststart = b;
|
||
|
||
/* We test `*p == '^' twice, instead of using an if
|
||
statement, so we only need one BUF_PUSH. */
|
||
BUF_PUSH (*p == '^' ? charset_not : charset);
|
||
if (*p == '^')
|
||
p++;
|
||
|
||
/* Remember the first position in the bracket expression. */
|
||
p1 = p;
|
||
|
||
/* Push the number of bytes in the bitmap. */
|
||
BUF_PUSH ((1 << BYTEWIDTH) / BYTEWIDTH);
|
||
|
||
/* Clear the whole map. */
|
||
bzero (b, (1 << BYTEWIDTH) / BYTEWIDTH);
|
||
|
||
/* charset_not matches newline according to a syntax bit. */
|
||
if ((re_opcode_t) b[-2] == charset_not
|
||
&& (syntax & RE_HAT_LISTS_NOT_NEWLINE))
|
||
SET_LIST_BIT ('\n');
|
||
|
||
/* Read in characters and ranges, setting map bits. */
|
||
for (;;)
|
||
{
|
||
if (p == pend) return REG_EBRACK;
|
||
|
||
PATFETCH (c);
|
||
|
||
/* \ might escape characters inside [...] and [^...]. */
|
||
if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\')
|
||
{
|
||
if (p == pend) return REG_EESCAPE;
|
||
|
||
PATFETCH (c1);
|
||
SET_LIST_BIT (c1);
|
||
continue;
|
||
}
|
||
|
||
/* Could be the end of the bracket expression. If it's
|
||
not (i.e., when the bracket expression is `[]' so
|
||
far), the ']' character bit gets set way below. */
|
||
if (c == ']' && p != p1 + 1)
|
||
break;
|
||
|
||
/* Look ahead to see if it's a range when the last thing
|
||
was a character class. */
|
||
if (had_char_class && c == '-' && *p != ']')
|
||
return REG_ERANGE;
|
||
|
||
/* Look ahead to see if it's a range when the last thing
|
||
was a character: if this is a hyphen not at the
|
||
beginning or the end of a list, then it's the range
|
||
operator. */
|
||
if (c == '-'
|
||
&& !(p - 2 >= pattern && p[-2] == '[')
|
||
&& !(p - 3 >= pattern && p[-3] == '[' && p[-2] == '^')
|
||
&& *p != ']')
|
||
{
|
||
reg_errcode_t ret
|
||
= compile_range (&p, pend, translate, syntax, b);
|
||
if (ret != REG_NOERROR) return ret;
|
||
}
|
||
|
||
else if (p[0] == '-' && p[1] != ']')
|
||
{ /* This handles ranges made up of characters only. */
|
||
reg_errcode_t ret;
|
||
|
||
/* Move past the `-'. */
|
||
PATFETCH (c1);
|
||
|
||
ret = compile_range (&p, pend, translate, syntax, b);
|
||
if (ret != REG_NOERROR) return ret;
|
||
}
|
||
|
||
/* See if we're at the beginning of a possible character
|
||
class. */
|
||
|
||
else if (syntax & RE_CHAR_CLASSES && c == '[' && *p == ':')
|
||
{ /* Leave room for the null. */
|
||
char str[CHAR_CLASS_MAX_LENGTH + 1];
|
||
|
||
PATFETCH (c);
|
||
c1 = 0;
|
||
|
||
/* If pattern is `[[:'. */
|
||
if (p == pend) return REG_EBRACK;
|
||
|
||
for (;;)
|
||
{
|
||
PATFETCH (c);
|
||
if (c == ':' || c == ']' || p == pend
|
||
|| c1 == CHAR_CLASS_MAX_LENGTH)
|
||
break;
|
||
str[c1++] = c;
|
||
}
|
||
str[c1] = '\0';
|
||
|
||
/* If isn't a word bracketed by `[:' and:`]':
|
||
undo the ending character, the letters, and leave
|
||
the leading `:' and `[' (but set bits for them). */
|
||
if (c == ':' && *p == ']')
|
||
{
|
||
int ch;
|
||
boolean is_alnum = STREQ (str, "alnum");
|
||
boolean is_alpha = STREQ (str, "alpha");
|
||
boolean is_blank = STREQ (str, "blank");
|
||
boolean is_cntrl = STREQ (str, "cntrl");
|
||
boolean is_digit = STREQ (str, "digit");
|
||
boolean is_graph = STREQ (str, "graph");
|
||
boolean is_lower = STREQ (str, "lower");
|
||
boolean is_print = STREQ (str, "print");
|
||
boolean is_punct = STREQ (str, "punct");
|
||
boolean is_space = STREQ (str, "space");
|
||
boolean is_upper = STREQ (str, "upper");
|
||
boolean is_xdigit = STREQ (str, "xdigit");
|
||
|
||
if (!IS_CHAR_CLASS (str)) return REG_ECTYPE;
|
||
|
||
/* Throw away the ] at the end of the character
|
||
class. */
|
||
PATFETCH (c);
|
||
|
||
if (p == pend) return REG_EBRACK;
|
||
|
||
for (ch = 0; ch < 1 << BYTEWIDTH; ch++)
|
||
{
|
||
if ( (is_alnum && ISALNUM (ch))
|
||
|| (is_alpha && ISALPHA (ch))
|
||
|| (is_blank && ISBLANK (ch))
|
||
|| (is_cntrl && ISCNTRL (ch))
|
||
|| (is_digit && ISDIGIT (ch))
|
||
|| (is_graph && ISGRAPH (ch))
|
||
|| (is_lower && ISLOWER (ch))
|
||
|| (is_print && ISPRINT (ch))
|
||
|| (is_punct && ISPUNCT (ch))
|
||
|| (is_space && ISSPACE (ch))
|
||
|| (is_upper && ISUPPER (ch))
|
||
|| (is_xdigit && ISXDIGIT (ch)))
|
||
SET_LIST_BIT (ch);
|
||
}
|
||
had_char_class = true;
|
||
}
|
||
else
|
||
{
|
||
c1++;
|
||
while (c1--)
|
||
PATUNFETCH;
|
||
SET_LIST_BIT ('[');
|
||
SET_LIST_BIT (':');
|
||
had_char_class = false;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
had_char_class = false;
|
||
SET_LIST_BIT (c);
|
||
}
|
||
}
|
||
|
||
/* Discard any (non)matching list bytes that are all 0 at the
|
||
end of the map. Decrease the map-length byte too. */
|
||
while ((int) b[-1] > 0 && b[b[-1] - 1] == 0)
|
||
b[-1]--;
|
||
b += b[-1];
|
||
}
|
||
break;
|
||
|
||
|
||
case '(':
|
||
if (syntax & RE_NO_BK_PARENS)
|
||
goto handle_open;
|
||
else
|
||
goto normal_char;
|
||
|
||
|
||
case ')':
|
||
if (syntax & RE_NO_BK_PARENS)
|
||
goto handle_close;
|
||
else
|
||
goto normal_char;
|
||
|
||
|
||
case '\n':
|
||
if (syntax & RE_NEWLINE_ALT)
|
||
goto handle_alt;
|
||
else
|
||
goto normal_char;
|
||
|
||
|
||
case '|':
|
||
if (syntax & RE_NO_BK_VBAR)
|
||
goto handle_alt;
|
||
else
|
||
goto normal_char;
|
||
|
||
|
||
case '{':
|
||
if (syntax & RE_INTERVALS && syntax & RE_NO_BK_BRACES)
|
||
goto handle_interval;
|
||
else
|
||
goto normal_char;
|
||
|
||
|
||
case '\\':
|
||
if (p == pend) return REG_EESCAPE;
|
||
|
||
/* Do not translate the character after the \, so that we can
|
||
distinguish, e.g., \B from \b, even if we normally would
|
||
translate, e.g., B to b. */
|
||
PATFETCH_RAW (c);
|
||
|
||
switch (c)
|
||
{
|
||
case '(':
|
||
if (syntax & RE_NO_BK_PARENS)
|
||
goto normal_backslash;
|
||
|
||
handle_open:
|
||
bufp->re_nsub++;
|
||
regnum++;
|
||
|
||
if (COMPILE_STACK_FULL)
|
||
{
|
||
RETALLOC (compile_stack.stack, compile_stack.size << 1,
|
||
compile_stack_elt_t);
|
||
if (compile_stack.stack == NULL) return REG_ESPACE;
|
||
|
||
compile_stack.size <<= 1;
|
||
}
|
||
|
||
/* These are the values to restore when we hit end of this
|
||
group. They are all relative offsets, so that if the
|
||
whole pattern moves because of realloc, they will still
|
||
be valid. */
|
||
COMPILE_STACK_TOP.begalt_offset = begalt - bufp->buffer;
|
||
COMPILE_STACK_TOP.fixup_alt_jump
|
||
= fixup_alt_jump ? fixup_alt_jump - bufp->buffer + 1 : 0;
|
||
COMPILE_STACK_TOP.laststart_offset = b - bufp->buffer;
|
||
COMPILE_STACK_TOP.regnum = regnum;
|
||
|
||
/* We will eventually replace the 0 with the number of
|
||
groups inner to this one. But do not push a
|
||
start_memory for groups beyond the last one we can
|
||
represent in the compiled pattern. */
|
||
if (regnum <= MAX_REGNUM)
|
||
{
|
||
COMPILE_STACK_TOP.inner_group_offset = b - bufp->buffer + 2;
|
||
BUF_PUSH_3 (start_memory, regnum, 0);
|
||
}
|
||
|
||
compile_stack.avail++;
|
||
|
||
fixup_alt_jump = 0;
|
||
laststart = 0;
|
||
begalt = b;
|
||
/* If we've reached MAX_REGNUM groups, then this open
|
||
won't actually generate any code, so we'll have to
|
||
clear pending_exact explicitly. */
|
||
pending_exact = 0;
|
||
break;
|
||
|
||
|
||
case ')':
|
||
if (syntax & RE_NO_BK_PARENS) goto normal_backslash;
|
||
|
||
if (COMPILE_STACK_EMPTY)
|
||
{
|
||
if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)
|
||
goto normal_backslash;
|
||
else
|
||
return REG_ERPAREN;
|
||
}
|
||
|
||
handle_close:
|
||
if (fixup_alt_jump)
|
||
{ /* Push a dummy failure point at the end of the
|
||
alternative for a possible future
|
||
`pop_failure_jump' to pop. See comments at
|
||
`push_dummy_failure' in `re_match_2'. */
|
||
BUF_PUSH (push_dummy_failure);
|
||
|
||
/* We allocated space for this jump when we assigned
|
||
to `fixup_alt_jump', in the `handle_alt' case below. */
|
||
STORE_JUMP (jump_past_alt, fixup_alt_jump, b - 1);
|
||
}
|
||
|
||
/* See similar code for backslashed left paren above. */
|
||
if (COMPILE_STACK_EMPTY)
|
||
{
|
||
if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)
|
||
goto normal_char;
|
||
else
|
||
return REG_ERPAREN;
|
||
}
|
||
|
||
/* Since we just checked for an empty stack above, this
|
||
``can't happen''. */
|
||
assert (compile_stack.avail != 0);
|
||
{
|
||
/* We don't just want to restore into `regnum', because
|
||
later groups should continue to be numbered higher,
|
||
as in `(ab)c(de)' -- the second group is #2. */
|
||
regnum_t this_group_regnum;
|
||
|
||
compile_stack.avail--;
|
||
begalt = bufp->buffer + COMPILE_STACK_TOP.begalt_offset;
|
||
fixup_alt_jump
|
||
= COMPILE_STACK_TOP.fixup_alt_jump
|
||
? bufp->buffer + COMPILE_STACK_TOP.fixup_alt_jump - 1
|
||
: 0;
|
||
laststart = bufp->buffer + COMPILE_STACK_TOP.laststart_offset;
|
||
this_group_regnum = COMPILE_STACK_TOP.regnum;
|
||
/* If we've reached MAX_REGNUM groups, then this open
|
||
won't actually generate any code, so we'll have to
|
||
clear pending_exact explicitly. */
|
||
pending_exact = 0;
|
||
|
||
/* We're at the end of the group, so now we know how many
|
||
groups were inside this one. */
|
||
if (this_group_regnum <= MAX_REGNUM)
|
||
{
|
||
unsigned char *inner_group_loc
|
||
= bufp->buffer + COMPILE_STACK_TOP.inner_group_offset;
|
||
|
||
*inner_group_loc = regnum - this_group_regnum;
|
||
BUF_PUSH_3 (stop_memory, this_group_regnum,
|
||
regnum - this_group_regnum);
|
||
}
|
||
}
|
||
break;
|
||
|
||
|
||
case '|': /* `\|'. */
|
||
if (syntax & RE_LIMITED_OPS || syntax & RE_NO_BK_VBAR)
|
||
goto normal_backslash;
|
||
handle_alt:
|
||
if (syntax & RE_LIMITED_OPS)
|
||
goto normal_char;
|
||
|
||
/* Insert before the previous alternative a jump which
|
||
jumps to this alternative if the former fails. */
|
||
GET_BUFFER_SPACE (3);
|
||
INSERT_JUMP (on_failure_jump, begalt, b + 6);
|
||
pending_exact = 0;
|
||
b += 3;
|
||
|
||
/* The alternative before this one has a jump after it
|
||
which gets executed if it gets matched. Adjust that
|
||
jump so it will jump to this alternative's analogous
|
||
jump (put in below, which in turn will jump to the next
|
||
(if any) alternative's such jump, etc.). The last such
|
||
jump jumps to the correct final destination. A picture:
|
||
_____ _____
|
||
| | | |
|
||
| v | v
|
||
a | b | c
|
||
|
||
If we are at `b', then fixup_alt_jump right now points to a
|
||
three-byte space after `a'. We'll put in the jump, set
|
||
fixup_alt_jump to right after `b', and leave behind three
|
||
bytes which we'll fill in when we get to after `c'. */
|
||
|
||
if (fixup_alt_jump)
|
||
STORE_JUMP (jump_past_alt, fixup_alt_jump, b);
|
||
|
||
/* Mark and leave space for a jump after this alternative,
|
||
to be filled in later either by next alternative or
|
||
when know we're at the end of a series of alternatives. */
|
||
fixup_alt_jump = b;
|
||
GET_BUFFER_SPACE (3);
|
||
b += 3;
|
||
|
||
laststart = 0;
|
||
begalt = b;
|
||
break;
|
||
|
||
|
||
case '{':
|
||
/* If \{ is a literal. */
|
||
if (!(syntax & RE_INTERVALS)
|
||
/* If we're at `\{' and it's not the open-interval
|
||
operator. */
|
||
|| ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
|
||
|| (p - 2 == pattern && p == pend))
|
||
goto normal_backslash;
|
||
|
||
handle_interval:
|
||
{
|
||
/* If got here, then the syntax allows intervals. */
|
||
|
||
/* At least (most) this many matches must be made. */
|
||
int lower_bound = -1, upper_bound = -1;
|
||
|
||
beg_interval = p - 1;
|
||
|
||
if (p == pend)
|
||
{
|
||
if (syntax & RE_NO_BK_BRACES)
|
||
goto unfetch_interval;
|
||
else
|
||
return REG_EBRACE;
|
||
}
|
||
|
||
GET_UNSIGNED_NUMBER (lower_bound);
|
||
|
||
if (c == ',')
|
||
{
|
||
GET_UNSIGNED_NUMBER (upper_bound);
|
||
if (upper_bound < 0) upper_bound = RE_DUP_MAX;
|
||
}
|
||
else
|
||
/* Interval such as `{1}' => match exactly once. */
|
||
upper_bound = lower_bound;
|
||
|
||
if (lower_bound < 0 || upper_bound > RE_DUP_MAX
|
||
|| lower_bound > upper_bound)
|
||
{
|
||
if (syntax & RE_NO_BK_BRACES)
|
||
goto unfetch_interval;
|
||
else
|
||
return REG_BADBR;
|
||
}
|
||
|
||
if (!(syntax & RE_NO_BK_BRACES))
|
||
{
|
||
if (c != '\\') return REG_EBRACE;
|
||
|
||
PATFETCH (c);
|
||
}
|
||
|
||
if (c != '}')
|
||
{
|
||
if (syntax & RE_NO_BK_BRACES)
|
||
goto unfetch_interval;
|
||
else
|
||
return REG_BADBR;
|
||
}
|
||
|
||
/* We just parsed a valid interval. */
|
||
|
||
/* If it's invalid to have no preceding re. */
|
||
if (!laststart)
|
||
{
|
||
if (syntax & RE_CONTEXT_INVALID_OPS)
|
||
return REG_BADRPT;
|
||
else if (syntax & RE_CONTEXT_INDEP_OPS)
|
||
laststart = b;
|
||
else
|
||
goto unfetch_interval;
|
||
}
|
||
|
||
/* If the upper bound is zero, don't want to succeed at
|
||
all; jump from `laststart' to `b + 3', which will be
|
||
the end of the buffer after we insert the jump. */
|
||
if (upper_bound == 0)
|
||
{
|
||
GET_BUFFER_SPACE (3);
|
||
INSERT_JUMP (jump, laststart, b + 3);
|
||
b += 3;
|
||
}
|
||
|
||
/* Otherwise, we have a nontrivial interval. When
|
||
we're all done, the pattern will look like:
|
||
set_number_at <jump count> <upper bound>
|
||
set_number_at <succeed_n count> <lower bound>
|
||
succeed_n <after jump addr> <succed_n count>
|
||
<body of loop>
|
||
jump_n <succeed_n addr> <jump count>
|
||
(The upper bound and `jump_n' are omitted if
|
||
`upper_bound' is 1, though.) */
|
||
else
|
||
{ /* If the upper bound is > 1, we need to insert
|
||
more at the end of the loop. */
|
||
unsigned nbytes = 10 + (upper_bound > 1) * 10;
|
||
|
||
GET_BUFFER_SPACE (nbytes);
|
||
|
||
/* Initialize lower bound of the `succeed_n', even
|
||
though it will be set during matching by its
|
||
attendant `set_number_at' (inserted next),
|
||
because `re_compile_fastmap' needs to know.
|
||
Jump to the `jump_n' we might insert below. */
|
||
INSERT_JUMP2 (succeed_n, laststart,
|
||
b + 5 + (upper_bound > 1) * 5,
|
||
lower_bound);
|
||
b += 5;
|
||
|
||
/* Code to initialize the lower bound. Insert
|
||
before the `succeed_n'. The `5' is the last two
|
||
bytes of this `set_number_at', plus 3 bytes of
|
||
the following `succeed_n'. */
|
||
insert_op2 (set_number_at, laststart, 5, lower_bound, b);
|
||
b += 5;
|
||
|
||
if (upper_bound > 1)
|
||
{ /* More than one repetition is allowed, so
|
||
append a backward jump to the `succeed_n'
|
||
that starts this interval.
|
||
|
||
When we've reached this during matching,
|
||
we'll have matched the interval once, so
|
||
jump back only `upper_bound - 1' times. */
|
||
STORE_JUMP2 (jump_n, b, laststart + 5,
|
||
upper_bound - 1);
|
||
b += 5;
|
||
|
||
/* The location we want to set is the second
|
||
parameter of the `jump_n'; that is `b-2' as
|
||
an absolute address. `laststart' will be
|
||
the `set_number_at' we're about to insert;
|
||
`laststart+3' the number to set, the source
|
||
for the relative address. But we are
|
||
inserting into the middle of the pattern --
|
||
so everything is getting moved up by 5.
|
||
Conclusion: (b - 2) - (laststart + 3) + 5,
|
||
i.e., b - laststart.
|
||
|
||
We insert this at the beginning of the loop
|
||
so that if we fail during matching, we'll
|
||
reinitialize the bounds. */
|
||
insert_op2 (set_number_at, laststart, b - laststart,
|
||
upper_bound - 1, b);
|
||
b += 5;
|
||
}
|
||
}
|
||
pending_exact = 0;
|
||
beg_interval = NULL;
|
||
}
|
||
break;
|
||
|
||
unfetch_interval:
|
||
/* If an invalid interval, match the characters as literals. */
|
||
assert (beg_interval);
|
||
p = beg_interval;
|
||
beg_interval = NULL;
|
||
|
||
/* normal_char and normal_backslash need `c'. */
|
||
PATFETCH (c);
|
||
|
||
if (!(syntax & RE_NO_BK_BRACES))
|
||
{
|
||
if (p > pattern && p[-1] == '\\')
|
||
goto normal_backslash;
|
||
}
|
||
goto normal_char;
|
||
|
||
#ifdef emacs
|
||
/* There is no way to specify the before_dot and after_dot
|
||
operators. rms says this is ok. --karl */
|
||
case '=':
|
||
BUF_PUSH (at_dot);
|
||
break;
|
||
|
||
case 's':
|
||
laststart = b;
|
||
PATFETCH (c);
|
||
BUF_PUSH_2 (syntaxspec, syntax_spec_code[c]);
|
||
break;
|
||
|
||
case 'S':
|
||
laststart = b;
|
||
PATFETCH (c);
|
||
BUF_PUSH_2 (notsyntaxspec, syntax_spec_code[c]);
|
||
break;
|
||
#endif /* emacs */
|
||
|
||
|
||
case 'w':
|
||
laststart = b;
|
||
BUF_PUSH (wordchar);
|
||
break;
|
||
|
||
|
||
case 'W':
|
||
laststart = b;
|
||
BUF_PUSH (notwordchar);
|
||
break;
|
||
|
||
|
||
case '<':
|
||
BUF_PUSH (wordbeg);
|
||
break;
|
||
|
||
case '>':
|
||
BUF_PUSH (wordend);
|
||
break;
|
||
|
||
case 'b':
|
||
BUF_PUSH (wordbound);
|
||
break;
|
||
|
||
case 'B':
|
||
BUF_PUSH (notwordbound);
|
||
break;
|
||
|
||
case '`':
|
||
BUF_PUSH (begbuf);
|
||
break;
|
||
|
||
case '\'':
|
||
BUF_PUSH (endbuf);
|
||
break;
|
||
|
||
case '1': case '2': case '3': case '4': case '5':
|
||
case '6': case '7': case '8': case '9':
|
||
if (syntax & RE_NO_BK_REFS)
|
||
goto normal_char;
|
||
|
||
c1 = c - '0';
|
||
|
||
if (c1 > regnum)
|
||
return REG_ESUBREG;
|
||
|
||
/* Can't back reference to a subexpression if inside of it. */
|
||
if (group_in_compile_stack (compile_stack, c1))
|
||
goto normal_char;
|
||
|
||
laststart = b;
|
||
BUF_PUSH_2 (duplicate, c1);
|
||
break;
|
||
|
||
|
||
case '+':
|
||
case '?':
|
||
if (syntax & RE_BK_PLUS_QM)
|
||
goto handle_plus;
|
||
else
|
||
goto normal_backslash;
|
||
|
||
default:
|
||
normal_backslash:
|
||
/* You might think it would be useful for \ to mean
|
||
not to translate; but if we don't translate it
|
||
it will never match anything. */
|
||
c = TRANSLATE (c);
|
||
goto normal_char;
|
||
}
|
||
break;
|
||
|
||
|
||
default:
|
||
/* Expects the character in `c'. */
|
||
normal_char:
|
||
/* If no exactn currently being built. */
|
||
if (!pending_exact
|
||
|
||
/* If last exactn not at current position. */
|
||
|| pending_exact + *pending_exact + 1 != b
|
||
|
||
/* We have only one byte following the exactn for the count. */
|
||
|| *pending_exact == (1 << BYTEWIDTH) - 1
|
||
|
||
/* If followed by a repetition operator. */
|
||
|| *p == '*' || *p == '^'
|
||
|| ((syntax & RE_BK_PLUS_QM)
|
||
? *p == '\\' && (p[1] == '+' || p[1] == '?')
|
||
: (*p == '+' || *p == '?'))
|
||
|| ((syntax & RE_INTERVALS)
|
||
&& ((syntax & RE_NO_BK_BRACES)
|
||
? *p == '{'
|
||
: (p[0] == '\\' && p[1] == '{'))))
|
||
{
|
||
/* Start building a new exactn. */
|
||
|
||
laststart = b;
|
||
|
||
BUF_PUSH_2 (exactn, 0);
|
||
pending_exact = b - 1;
|
||
}
|
||
|
||
BUF_PUSH (c);
|
||
(*pending_exact)++;
|
||
break;
|
||
} /* switch (c) */
|
||
} /* while p != pend */
|
||
|
||
|
||
/* Through the pattern now. */
|
||
|
||
if (fixup_alt_jump)
|
||
STORE_JUMP (jump_past_alt, fixup_alt_jump, b);
|
||
|
||
if (!COMPILE_STACK_EMPTY)
|
||
return REG_EPAREN;
|
||
|
||
free (compile_stack.stack);
|
||
|
||
/* We have succeeded; set the length of the buffer. */
|
||
bufp->used = b - bufp->buffer;
|
||
|
||
#ifdef DEBUG
|
||
if (debug)
|
||
{
|
||
DEBUG_PRINT1 ("\nCompiled pattern: ");
|
||
print_compiled_pattern (bufp);
|
||
}
|
||
#endif /* DEBUG */
|
||
|
||
return REG_NOERROR;
|
||
} /* regex_compile */
|
||
|
||
/* Subroutines for `regex_compile'. */
|
||
|
||
/* Store OP at LOC followed by two-byte integer parameter ARG. */
|
||
|
||
static void
|
||
store_op1 (op, loc, arg)
|
||
re_opcode_t op;
|
||
unsigned char *loc;
|
||
int arg;
|
||
{
|
||
*loc = (unsigned char) op;
|
||
STORE_NUMBER (loc + 1, arg);
|
||
}
|
||
|
||
|
||
/* Like `store_op1', but for two two-byte parameters ARG1 and ARG2. */
|
||
|
||
static void
|
||
store_op2 (op, loc, arg1, arg2)
|
||
re_opcode_t op;
|
||
unsigned char *loc;
|
||
int arg1, arg2;
|
||
{
|
||
*loc = (unsigned char) op;
|
||
STORE_NUMBER (loc + 1, arg1);
|
||
STORE_NUMBER (loc + 3, arg2);
|
||
}
|
||
|
||
|
||
/* Copy the bytes from LOC to END to open up three bytes of space at LOC
|
||
for OP followed by two-byte integer parameter ARG. */
|
||
|
||
static void
|
||
insert_op1 (op, loc, arg, end)
|
||
re_opcode_t op;
|
||
unsigned char *loc;
|
||
int arg;
|
||
unsigned char *end;
|
||
{
|
||
register unsigned char *pfrom = end;
|
||
register unsigned char *pto = end + 3;
|
||
|
||
while (pfrom != loc)
|
||
*--pto = *--pfrom;
|
||
|
||
store_op1 (op, loc, arg);
|
||
}
|
||
|
||
|
||
/* Like `insert_op1', but for two two-byte parameters ARG1 and ARG2. */
|
||
|
||
static void
|
||
insert_op2 (op, loc, arg1, arg2, end)
|
||
re_opcode_t op;
|
||
unsigned char *loc;
|
||
int arg1, arg2;
|
||
unsigned char *end;
|
||
{
|
||
register unsigned char *pfrom = end;
|
||
register unsigned char *pto = end + 5;
|
||
|
||
while (pfrom != loc)
|
||
*--pto = *--pfrom;
|
||
|
||
store_op2 (op, loc, arg1, arg2);
|
||
}
|
||
|
||
|
||
/* P points to just after a ^ in PATTERN. Return true if that ^ comes
|
||
after an alternative or a begin-subexpression. We assume there is at
|
||
least one character before the ^. */
|
||
|
||
static boolean
|
||
at_begline_loc_p (pattern, p, syntax)
|
||
const char *pattern, *p;
|
||
reg_syntax_t syntax;
|
||
{
|
||
const char *prev = p - 2;
|
||
boolean prev_prev_backslash = prev > pattern && prev[-1] == '\\';
|
||
|
||
return
|
||
/* After a subexpression? */
|
||
(*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash))
|
||
/* After an alternative? */
|
||
|| (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash));
|
||
}
|
||
|
||
|
||
/* The dual of at_begline_loc_p. This one is for $. We assume there is
|
||
at least one character after the $, i.e., `P < PEND'. */
|
||
|
||
static boolean
|
||
at_endline_loc_p (p, pend, syntax)
|
||
const char *p, *pend;
|
||
int syntax;
|
||
{
|
||
const char *next = p;
|
||
boolean next_backslash = *next == '\\';
|
||
const char *next_next = p + 1 < pend ? p + 1 : NULL;
|
||
|
||
return
|
||
/* Before a subexpression? */
|
||
(syntax & RE_NO_BK_PARENS ? *next == ')'
|
||
: next_backslash && next_next && *next_next == ')')
|
||
/* Before an alternative? */
|
||
|| (syntax & RE_NO_BK_VBAR ? *next == '|'
|
||
: next_backslash && next_next && *next_next == '|');
|
||
}
|
||
|
||
|
||
/* Returns true if REGNUM is in one of COMPILE_STACK's elements and
|
||
false if it's not. */
|
||
|
||
static boolean
|
||
group_in_compile_stack (compile_stack, regnum)
|
||
compile_stack_type compile_stack;
|
||
regnum_t regnum;
|
||
{
|
||
int this_element;
|
||
|
||
for (this_element = compile_stack.avail - 1;
|
||
this_element >= 0;
|
||
this_element--)
|
||
if (compile_stack.stack[this_element].regnum == regnum)
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
|
||
/* Read the ending character of a range (in a bracket expression) from the
|
||
uncompiled pattern *P_PTR (which ends at PEND). We assume the
|
||
starting character is in `P[-2]'. (`P[-1]' is the character `-'.)
|
||
Then we set the translation of all bits between the starting and
|
||
ending characters (inclusive) in the compiled pattern B.
|
||
|
||
Return an error code.
|
||
|
||
We use these short variable names so we can use the same macros as
|
||
`regex_compile' itself. */
|
||
|
||
static reg_errcode_t
|
||
compile_range (p_ptr, pend, translate, syntax, b)
|
||
const char **p_ptr, *pend;
|
||
char *translate;
|
||
reg_syntax_t syntax;
|
||
unsigned char *b;
|
||
{
|
||
unsigned this_char;
|
||
|
||
const char *p = *p_ptr;
|
||
int range_start, range_end;
|
||
|
||
if (p == pend)
|
||
return REG_ERANGE;
|
||
|
||
/* Even though the pattern is a signed `char *', we need to fetch
|
||
with unsigned char *'s; if the high bit of the pattern character
|
||
is set, the range endpoints will be negative if we fetch using a
|
||
signed char *.
|
||
|
||
We also want to fetch the endpoints without translating them; the
|
||
appropriate translation is done in the bit-setting loop below. */
|
||
range_start = ((unsigned char *) p)[-2];
|
||
range_end = ((unsigned char *) p)[0];
|
||
|
||
/* Have to increment the pointer into the pattern string, so the
|
||
caller isn't still at the ending character. */
|
||
(*p_ptr)++;
|
||
|
||
/* If the start is after the end, the range is empty. */
|
||
if (range_start > range_end)
|
||
return syntax & RE_NO_EMPTY_RANGES ? REG_ERANGE : REG_NOERROR;
|
||
|
||
/* Here we see why `this_char' has to be larger than an `unsigned
|
||
char' -- the range is inclusive, so if `range_end' == 0xff
|
||
(assuming 8-bit characters), we would otherwise go into an infinite
|
||
loop, since all characters <= 0xff. */
|
||
for (this_char = range_start; this_char <= range_end; this_char++)
|
||
{
|
||
SET_LIST_BIT (TRANSLATE (this_char));
|
||
}
|
||
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Failure stack declarations and macros; both re_compile_fastmap and
|
||
re_match_2 use a failure stack. These have to be macros because of
|
||
REGEX_ALLOCATE. */
|
||
|
||
|
||
/* Number of failure points for which to initially allocate space
|
||
when matching. If this number is exceeded, we allocate more
|
||
space, so it is not a hard limit. */
|
||
#ifndef INIT_FAILURE_ALLOC
|
||
#define INIT_FAILURE_ALLOC 5
|
||
#endif
|
||
|
||
/* Roughly the maximum number of failure points on the stack. Would be
|
||
exactly that if always used MAX_FAILURE_SPACE each time we failed.
|
||
This is a variable only so users of regex can assign to it; we never
|
||
change it ourselves. */
|
||
int re_max_failures = 2000;
|
||
|
||
typedef const unsigned char *fail_stack_elt_t;
|
||
|
||
typedef struct
|
||
{
|
||
fail_stack_elt_t *stack;
|
||
unsigned size;
|
||
unsigned avail; /* Offset of next open position. */
|
||
} fail_stack_type;
|
||
|
||
#define FAIL_STACK_EMPTY() (fail_stack.avail == 0)
|
||
#define FAIL_STACK_PTR_EMPTY() (fail_stack_ptr->avail == 0)
|
||
#define FAIL_STACK_FULL() (fail_stack.avail == fail_stack.size)
|
||
#define FAIL_STACK_TOP() (fail_stack.stack[fail_stack.avail])
|
||
|
||
|
||
/* Initialize `fail_stack'. Do `return -2' if the alloc fails. */
|
||
|
||
#define INIT_FAIL_STACK() \
|
||
do { \
|
||
fail_stack.stack = (fail_stack_elt_t *) \
|
||
REGEX_ALLOCATE (INIT_FAILURE_ALLOC * sizeof (fail_stack_elt_t)); \
|
||
\
|
||
if (fail_stack.stack == NULL) \
|
||
return -2; \
|
||
\
|
||
fail_stack.size = INIT_FAILURE_ALLOC; \
|
||
fail_stack.avail = 0; \
|
||
} while (0)
|
||
|
||
|
||
/* Double the size of FAIL_STACK, up to approximately `re_max_failures' items.
|
||
|
||
Return 1 if succeeds, and 0 if either ran out of memory
|
||
allocating space for it or it was already too large.
|
||
|
||
REGEX_REALLOCATE requires `destination' be declared. */
|
||
|
||
#define DOUBLE_FAIL_STACK(fail_stack) \
|
||
((fail_stack).size > re_max_failures * MAX_FAILURE_ITEMS \
|
||
? 0 \
|
||
: ((fail_stack).stack = (fail_stack_elt_t *) \
|
||
REGEX_REALLOCATE ((fail_stack).stack, \
|
||
(fail_stack).size * sizeof (fail_stack_elt_t), \
|
||
((fail_stack).size << 1) * sizeof (fail_stack_elt_t)), \
|
||
\
|
||
(fail_stack).stack == NULL \
|
||
? 0 \
|
||
: ((fail_stack).size <<= 1, \
|
||
1)))
|
||
|
||
|
||
/* Push PATTERN_OP on FAIL_STACK.
|
||
|
||
Return 1 if was able to do so and 0 if ran out of memory allocating
|
||
space to do so. */
|
||
#define PUSH_PATTERN_OP(pattern_op, fail_stack) \
|
||
((FAIL_STACK_FULL () \
|
||
&& !DOUBLE_FAIL_STACK (fail_stack)) \
|
||
? 0 \
|
||
: ((fail_stack).stack[(fail_stack).avail++] = pattern_op, \
|
||
1))
|
||
|
||
/* This pushes an item onto the failure stack. Must be a four-byte
|
||
value. Assumes the variable `fail_stack'. Probably should only
|
||
be called from within `PUSH_FAILURE_POINT'. */
|
||
#define PUSH_FAILURE_ITEM(item) \
|
||
fail_stack.stack[fail_stack.avail++] = (fail_stack_elt_t) item
|
||
|
||
/* The complement operation. Assumes `fail_stack' is nonempty. */
|
||
#define POP_FAILURE_ITEM() fail_stack.stack[--fail_stack.avail]
|
||
|
||
/* Used to omit pushing failure point id's when we're not debugging. */
|
||
#ifdef DEBUG
|
||
#define DEBUG_PUSH PUSH_FAILURE_ITEM
|
||
#define DEBUG_POP(item_addr) *(item_addr) = POP_FAILURE_ITEM ()
|
||
#else
|
||
#define DEBUG_PUSH(item)
|
||
#define DEBUG_POP(item_addr)
|
||
#endif
|
||
|
||
|
||
/* Push the information about the state we will need
|
||
if we ever fail back to it.
|
||
|
||
Requires variables fail_stack, regstart, regend, reg_info, and
|
||
num_regs be declared. DOUBLE_FAIL_STACK requires `destination' be
|
||
declared.
|
||
|
||
Does `return FAILURE_CODE' if runs out of memory. */
|
||
|
||
#define PUSH_FAILURE_POINT(pattern_place, string_place, failure_code) \
|
||
do { \
|
||
char *destination; \
|
||
/* Must be int, so when we don't save any registers, the arithmetic \
|
||
of 0 + -1 isn't done as unsigned. */ \
|
||
int this_reg; \
|
||
\
|
||
DEBUG_STATEMENT (failure_id++); \
|
||
DEBUG_STATEMENT (nfailure_points_pushed++); \
|
||
DEBUG_PRINT2 ("\nPUSH_FAILURE_POINT #%u:\n", failure_id); \
|
||
DEBUG_PRINT2 (" Before push, next avail: %d\n", (fail_stack).avail);\
|
||
DEBUG_PRINT2 (" size: %d\n", (fail_stack).size);\
|
||
\
|
||
DEBUG_PRINT2 (" slots needed: %d\n", NUM_FAILURE_ITEMS); \
|
||
DEBUG_PRINT2 (" available: %d\n", REMAINING_AVAIL_SLOTS); \
|
||
\
|
||
/* Ensure we have enough space allocated for what we will push. */ \
|
||
while (REMAINING_AVAIL_SLOTS < NUM_FAILURE_ITEMS) \
|
||
{ \
|
||
if (!DOUBLE_FAIL_STACK (fail_stack)) \
|
||
return failure_code; \
|
||
\
|
||
DEBUG_PRINT2 ("\n Doubled stack; size now: %d\n", \
|
||
(fail_stack).size); \
|
||
DEBUG_PRINT2 (" slots available: %d\n", REMAINING_AVAIL_SLOTS);\
|
||
} \
|
||
\
|
||
/* Push the info, starting with the registers. */ \
|
||
DEBUG_PRINT1 ("\n"); \
|
||
\
|
||
for (this_reg = lowest_active_reg; this_reg <= highest_active_reg; \
|
||
this_reg++) \
|
||
{ \
|
||
DEBUG_PRINT2 (" Pushing reg: %d\n", this_reg); \
|
||
DEBUG_STATEMENT (num_regs_pushed++); \
|
||
\
|
||
DEBUG_PRINT2 (" start: 0x%x\n", regstart[this_reg]); \
|
||
PUSH_FAILURE_ITEM (regstart[this_reg]); \
|
||
\
|
||
DEBUG_PRINT2 (" end: 0x%x\n", regend[this_reg]); \
|
||
PUSH_FAILURE_ITEM (regend[this_reg]); \
|
||
\
|
||
DEBUG_PRINT2 (" info: 0x%x\n ", reg_info[this_reg]); \
|
||
DEBUG_PRINT2 (" match_null=%d", \
|
||
REG_MATCH_NULL_STRING_P (reg_info[this_reg])); \
|
||
DEBUG_PRINT2 (" active=%d", IS_ACTIVE (reg_info[this_reg])); \
|
||
DEBUG_PRINT2 (" matched_something=%d", \
|
||
MATCHED_SOMETHING (reg_info[this_reg])); \
|
||
DEBUG_PRINT2 (" ever_matched=%d", \
|
||
EVER_MATCHED_SOMETHING (reg_info[this_reg])); \
|
||
DEBUG_PRINT1 ("\n"); \
|
||
PUSH_FAILURE_ITEM (reg_info[this_reg].word); \
|
||
} \
|
||
\
|
||
DEBUG_PRINT2 (" Pushing low active reg: %d\n", lowest_active_reg);\
|
||
PUSH_FAILURE_ITEM (lowest_active_reg); \
|
||
\
|
||
DEBUG_PRINT2 (" Pushing high active reg: %d\n", highest_active_reg);\
|
||
PUSH_FAILURE_ITEM (highest_active_reg); \
|
||
\
|
||
DEBUG_PRINT2 (" Pushing pattern 0x%x: ", pattern_place); \
|
||
DEBUG_PRINT_COMPILED_PATTERN (bufp, pattern_place, pend); \
|
||
PUSH_FAILURE_ITEM (pattern_place); \
|
||
\
|
||
DEBUG_PRINT2 (" Pushing string 0x%x: `", string_place); \
|
||
DEBUG_PRINT_DOUBLE_STRING (string_place, string1, size1, string2, \
|
||
size2); \
|
||
DEBUG_PRINT1 ("'\n"); \
|
||
PUSH_FAILURE_ITEM (string_place); \
|
||
\
|
||
DEBUG_PRINT2 (" Pushing failure id: %u\n", failure_id); \
|
||
DEBUG_PUSH (failure_id); \
|
||
} while (0)
|
||
|
||
/* This is the number of items that are pushed and popped on the stack
|
||
for each register. */
|
||
#define NUM_REG_ITEMS 3
|
||
|
||
/* Individual items aside from the registers. */
|
||
#ifdef DEBUG
|
||
#define NUM_NONREG_ITEMS 5 /* Includes failure point id. */
|
||
#else
|
||
#define NUM_NONREG_ITEMS 4
|
||
#endif
|
||
|
||
/* We push at most this many items on the stack. */
|
||
#define MAX_FAILURE_ITEMS ((num_regs - 1) * NUM_REG_ITEMS + NUM_NONREG_ITEMS)
|
||
|
||
/* We actually push this many items. */
|
||
#define NUM_FAILURE_ITEMS \
|
||
((highest_active_reg - lowest_active_reg + 1) * NUM_REG_ITEMS \
|
||
+ NUM_NONREG_ITEMS)
|
||
|
||
/* How many items can still be added to the stack without overflowing it. */
|
||
#define REMAINING_AVAIL_SLOTS ((fail_stack).size - (fail_stack).avail)
|
||
|
||
|
||
/* Pops what PUSH_FAIL_STACK pushes.
|
||
|
||
We restore into the parameters, all of which should be lvalues:
|
||
STR -- the saved data position.
|
||
PAT -- the saved pattern position.
|
||
LOW_REG, HIGH_REG -- the highest and lowest active registers.
|
||
REGSTART, REGEND -- arrays of string positions.
|
||
REG_INFO -- array of information about each subexpression.
|
||
|
||
Also assumes the variables `fail_stack' and (if debugging), `bufp',
|
||
`pend', `string1', `size1', `string2', and `size2'. */
|
||
|
||
#define POP_FAILURE_POINT(str, pat, low_reg, high_reg, regstart, regend, reg_info)\
|
||
{ \
|
||
DEBUG_STATEMENT (fail_stack_elt_t failure_id;) \
|
||
int this_reg; \
|
||
const unsigned char *string_temp; \
|
||
\
|
||
assert (!FAIL_STACK_EMPTY ()); \
|
||
\
|
||
/* Remove failure points and point to how many regs pushed. */ \
|
||
DEBUG_PRINT1 ("POP_FAILURE_POINT:\n"); \
|
||
DEBUG_PRINT2 (" Before pop, next avail: %d\n", fail_stack.avail); \
|
||
DEBUG_PRINT2 (" size: %d\n", fail_stack.size); \
|
||
\
|
||
assert (fail_stack.avail >= NUM_NONREG_ITEMS); \
|
||
\
|
||
DEBUG_POP (&failure_id); \
|
||
DEBUG_PRINT2 (" Popping failure id: %u\n", failure_id); \
|
||
\
|
||
/* If the saved string location is NULL, it came from an \
|
||
on_failure_keep_string_jump opcode, and we want to throw away the \
|
||
saved NULL, thus retaining our current position in the string. */ \
|
||
string_temp = POP_FAILURE_ITEM (); \
|
||
if (string_temp != NULL) \
|
||
str = (const char *) string_temp; \
|
||
\
|
||
DEBUG_PRINT2 (" Popping string 0x%x: `", str); \
|
||
DEBUG_PRINT_DOUBLE_STRING (str, string1, size1, string2, size2); \
|
||
DEBUG_PRINT1 ("'\n"); \
|
||
\
|
||
pat = (unsigned char *) POP_FAILURE_ITEM (); \
|
||
DEBUG_PRINT2 (" Popping pattern 0x%x: ", pat); \
|
||
DEBUG_PRINT_COMPILED_PATTERN (bufp, pat, pend); \
|
||
\
|
||
/* Restore register info. */ \
|
||
high_reg = (unsigned) POP_FAILURE_ITEM (); \
|
||
DEBUG_PRINT2 (" Popping high active reg: %d\n", high_reg); \
|
||
\
|
||
low_reg = (unsigned) POP_FAILURE_ITEM (); \
|
||
DEBUG_PRINT2 (" Popping low active reg: %d\n", low_reg); \
|
||
\
|
||
for (this_reg = high_reg; this_reg >= low_reg; this_reg--) \
|
||
{ \
|
||
DEBUG_PRINT2 (" Popping reg: %d\n", this_reg); \
|
||
\
|
||
reg_info[this_reg].word = POP_FAILURE_ITEM (); \
|
||
DEBUG_PRINT2 (" info: 0x%x\n", reg_info[this_reg]); \
|
||
\
|
||
regend[this_reg] = (const char *) POP_FAILURE_ITEM (); \
|
||
DEBUG_PRINT2 (" end: 0x%x\n", regend[this_reg]); \
|
||
\
|
||
regstart[this_reg] = (const char *) POP_FAILURE_ITEM (); \
|
||
DEBUG_PRINT2 (" start: 0x%x\n", regstart[this_reg]); \
|
||
} \
|
||
\
|
||
DEBUG_STATEMENT (nfailure_points_popped++); \
|
||
} /* POP_FAILURE_POINT */
|
||
|
||
/* re_compile_fastmap computes a ``fastmap'' for the compiled pattern in
|
||
BUFP. A fastmap records which of the (1 << BYTEWIDTH) possible
|
||
characters can start a string that matches the pattern. This fastmap
|
||
is used by re_search to skip quickly over impossible starting points.
|
||
|
||
The caller must supply the address of a (1 << BYTEWIDTH)-byte data
|
||
area as BUFP->fastmap.
|
||
|
||
We set the `fastmap', `fastmap_accurate', and `can_be_null' fields in
|
||
the pattern buffer.
|
||
|
||
Returns 0 if we succeed, -2 if an internal error. */
|
||
|
||
int
|
||
re_compile_fastmap (bufp)
|
||
struct re_pattern_buffer *bufp;
|
||
{
|
||
int j, k;
|
||
fail_stack_type fail_stack;
|
||
#ifndef REGEX_MALLOC
|
||
char *destination;
|
||
#endif
|
||
/* We don't push any register information onto the failure stack. */
|
||
unsigned num_regs = 0;
|
||
|
||
register char *fastmap = bufp->fastmap;
|
||
unsigned char *pattern = bufp->buffer;
|
||
unsigned long size = bufp->used;
|
||
const unsigned char *p = pattern;
|
||
register unsigned char *pend = pattern + size;
|
||
|
||
/* Assume that each path through the pattern can be null until
|
||
proven otherwise. We set this false at the bottom of switch
|
||
statement, to which we get only if a particular path doesn't
|
||
match the empty string. */
|
||
boolean path_can_be_null = true;
|
||
|
||
/* We aren't doing a `succeed_n' to begin with. */
|
||
boolean succeed_n_p = false;
|
||
|
||
assert (fastmap != NULL && p != NULL);
|
||
|
||
INIT_FAIL_STACK ();
|
||
bzero (fastmap, 1 << BYTEWIDTH); /* Assume nothing's valid. */
|
||
bufp->fastmap_accurate = 1; /* It will be when we're done. */
|
||
bufp->can_be_null = 0;
|
||
|
||
while (p != pend || !FAIL_STACK_EMPTY ())
|
||
{
|
||
if (p == pend)
|
||
{
|
||
bufp->can_be_null |= path_can_be_null;
|
||
|
||
/* Reset for next path. */
|
||
path_can_be_null = true;
|
||
|
||
p = fail_stack.stack[--fail_stack.avail];
|
||
}
|
||
|
||
/* We should never be about to go beyond the end of the pattern. */
|
||
assert (p < pend);
|
||
|
||
#ifdef SWITCH_ENUM_BUG
|
||
switch ((int) ((re_opcode_t) *p++))
|
||
#else
|
||
switch ((re_opcode_t) *p++)
|
||
#endif
|
||
{
|
||
|
||
/* I guess the idea here is to simply not bother with a fastmap
|
||
if a backreference is used, since it's too hard to figure out
|
||
the fastmap for the corresponding group. Setting
|
||
`can_be_null' stops `re_search_2' from using the fastmap, so
|
||
that is all we do. */
|
||
case duplicate:
|
||
bufp->can_be_null = 1;
|
||
return 0;
|
||
|
||
|
||
/* Following are the cases which match a character. These end
|
||
with `break'. */
|
||
|
||
case exactn:
|
||
fastmap[p[1]] = 1;
|
||
break;
|
||
|
||
|
||
case charset:
|
||
for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--)
|
||
if (p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH)))
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
|
||
case charset_not:
|
||
/* Chars beyond end of map must be allowed. */
|
||
for (j = *p * BYTEWIDTH; j < (1 << BYTEWIDTH); j++)
|
||
fastmap[j] = 1;
|
||
|
||
for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--)
|
||
if (!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))))
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
|
||
case wordchar:
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (SYNTAX (j) == Sword)
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
|
||
case notwordchar:
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (SYNTAX (j) != Sword)
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
|
||
case anychar:
|
||
/* `.' matches anything ... */
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
fastmap[j] = 1;
|
||
|
||
/* ... except perhaps newline. */
|
||
if (!(bufp->syntax & RE_DOT_NEWLINE))
|
||
fastmap['\n'] = 0;
|
||
|
||
/* Return if we have already set `can_be_null'; if we have,
|
||
then the fastmap is irrelevant. Something's wrong here. */
|
||
else if (bufp->can_be_null)
|
||
return 0;
|
||
|
||
/* Otherwise, have to check alternative paths. */
|
||
break;
|
||
|
||
|
||
#ifdef emacs
|
||
case syntaxspec:
|
||
k = *p++;
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (SYNTAX (j) == (enum syntaxcode) k)
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
|
||
case notsyntaxspec:
|
||
k = *p++;
|
||
for (j = 0; j < (1 << BYTEWIDTH); j++)
|
||
if (SYNTAX (j) != (enum syntaxcode) k)
|
||
fastmap[j] = 1;
|
||
break;
|
||
|
||
|
||
/* All cases after this match the empty string. These end with
|
||
`continue'. */
|
||
|
||
|
||
case before_dot:
|
||
case at_dot:
|
||
case after_dot:
|
||
continue;
|
||
#endif /* not emacs */
|
||
|
||
|
||
case no_op:
|
||
case begline:
|
||
case endline:
|
||
case begbuf:
|
||
case endbuf:
|
||
case wordbound:
|
||
case notwordbound:
|
||
case wordbeg:
|
||
case wordend:
|
||
case push_dummy_failure:
|
||
continue;
|
||
|
||
|
||
case jump_n:
|
||
case pop_failure_jump:
|
||
case maybe_pop_jump:
|
||
case jump:
|
||
case jump_past_alt:
|
||
case dummy_failure_jump:
|
||
EXTRACT_NUMBER_AND_INCR (j, p);
|
||
p += j;
|
||
if (j > 0)
|
||
continue;
|
||
|
||
/* Jump backward implies we just went through the body of a
|
||
loop and matched nothing. Opcode jumped to should be
|
||
`on_failure_jump' or `succeed_n'. Just treat it like an
|
||
ordinary jump. For a * loop, it has pushed its failure
|
||
point already; if so, discard that as redundant. */
|
||
if ((re_opcode_t) *p != on_failure_jump
|
||
&& (re_opcode_t) *p != succeed_n)
|
||
continue;
|
||
|
||
p++;
|
||
EXTRACT_NUMBER_AND_INCR (j, p);
|
||
p += j;
|
||
|
||
/* If what's on the stack is where we are now, pop it. */
|
||
if (!FAIL_STACK_EMPTY ()
|
||
&& fail_stack.stack[fail_stack.avail - 1] == p)
|
||
fail_stack.avail--;
|
||
|
||
continue;
|
||
|
||
|
||
case on_failure_jump:
|
||
case on_failure_keep_string_jump:
|
||
handle_on_failure_jump:
|
||
EXTRACT_NUMBER_AND_INCR (j, p);
|
||
|
||
/* For some patterns, e.g., `(a?)?', `p+j' here points to the
|
||
end of the pattern. We don't want to push such a point,
|
||
since when we restore it above, entering the switch will
|
||
increment `p' past the end of the pattern. We don't need
|
||
to push such a point since we obviously won't find any more
|
||
fastmap entries beyond `pend'. Such a pattern can match
|
||
the null string, though. */
|
||
if (p + j < pend)
|
||
{
|
||
if (!PUSH_PATTERN_OP (p + j, fail_stack))
|
||
return -2;
|
||
}
|
||
else
|
||
bufp->can_be_null = 1;
|
||
|
||
if (succeed_n_p)
|
||
{
|
||
EXTRACT_NUMBER_AND_INCR (k, p); /* Skip the n. */
|
||
succeed_n_p = false;
|
||
}
|
||
|
||
continue;
|
||
|
||
|
||
case succeed_n:
|
||
/* Get to the number of times to succeed. */
|
||
p += 2;
|
||
|
||
/* Increment p past the n for when k != 0. */
|
||
EXTRACT_NUMBER_AND_INCR (k, p);
|
||
if (k == 0)
|
||
{
|
||
p -= 4;
|
||
succeed_n_p = true; /* Spaghetti code alert. */
|
||
goto handle_on_failure_jump;
|
||
}
|
||
continue;
|
||
|
||
|
||
case set_number_at:
|
||
p += 4;
|
||
continue;
|
||
|
||
|
||
case start_memory:
|
||
case stop_memory:
|
||
p += 2;
|
||
continue;
|
||
|
||
|
||
default:
|
||
abort (); /* We have listed all the cases. */
|
||
} /* switch *p++ */
|
||
|
||
/* Getting here means we have found the possible starting
|
||
characters for one path of the pattern -- and that the empty
|
||
string does not match. We need not follow this path further.
|
||
Instead, look at the next alternative (remembered on the
|
||
stack), or quit if no more. The test at the top of the loop
|
||
does these things. */
|
||
path_can_be_null = false;
|
||
p = pend;
|
||
} /* while p */
|
||
|
||
/* Set `can_be_null' for the last path (also the first path, if the
|
||
pattern is empty). */
|
||
bufp->can_be_null |= path_can_be_null;
|
||
return 0;
|
||
} /* re_compile_fastmap */
|
||
|
||
/* Set REGS to hold NUM_REGS registers, storing them in STARTS and
|
||
ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use
|
||
this memory for recording register information. STARTS and ENDS
|
||
must be allocated using the malloc library routine, and must each
|
||
be at least NUM_REGS * sizeof (regoff_t) bytes long.
|
||
|
||
If NUM_REGS == 0, then subsequent matches should allocate their own
|
||
register data.
|
||
|
||
Unless this function is called, the first search or match using
|
||
PATTERN_BUFFER will allocate its own register data, without
|
||
freeing the old data. */
|
||
|
||
void
|
||
re_set_registers (bufp, regs, num_regs, starts, ends)
|
||
struct re_pattern_buffer *bufp;
|
||
struct re_registers *regs;
|
||
unsigned num_regs;
|
||
regoff_t *starts, *ends;
|
||
{
|
||
if (num_regs)
|
||
{
|
||
bufp->regs_allocated = REGS_REALLOCATE;
|
||
regs->num_regs = num_regs;
|
||
regs->start = starts;
|
||
regs->end = ends;
|
||
}
|
||
else
|
||
{
|
||
bufp->regs_allocated = REGS_UNALLOCATED;
|
||
regs->num_regs = 0;
|
||
regs->start = regs->end = (regoff_t) 0;
|
||
}
|
||
}
|
||
|
||
/* Searching routines. */
|
||
|
||
/* Like re_search_2, below, but only one string is specified, and
|
||
doesn't let you say where to stop matching. */
|
||
|
||
int
|
||
re_search (bufp, string, size, startpos, range, regs)
|
||
struct re_pattern_buffer *bufp;
|
||
const char *string;
|
||
int size, startpos, range;
|
||
struct re_registers *regs;
|
||
{
|
||
return re_search_2 (bufp, NULL, 0, string, size, startpos, range,
|
||
regs, size);
|
||
}
|
||
|
||
|
||
/* Using the compiled pattern in BUFP->buffer, first tries to match the
|
||
virtual concatenation of STRING1 and STRING2, starting first at index
|
||
STARTPOS, then at STARTPOS + 1, and so on.
|
||
|
||
STRING1 and STRING2 have length SIZE1 and SIZE2, respectively.
|
||
|
||
RANGE is how far to scan while trying to match. RANGE = 0 means try
|
||
only at STARTPOS; in general, the last start tried is STARTPOS +
|
||
RANGE.
|
||
|
||
In REGS, return the indices of the virtual concatenation of STRING1
|
||
and STRING2 that matched the entire BUFP->buffer and its contained
|
||
subexpressions.
|
||
|
||
Do not consider matching one past the index STOP in the virtual
|
||
concatenation of STRING1 and STRING2.
|
||
|
||
We return either the position in the strings at which the match was
|
||
found, -1 if no match, or -2 if error (such as failure
|
||
stack overflow). */
|
||
|
||
int
|
||
re_search_2 (bufp, string1, size1, string2, size2, startpos, range, regs, stop)
|
||
struct re_pattern_buffer *bufp;
|
||
const char *string1, *string2;
|
||
int size1, size2;
|
||
int startpos;
|
||
int range;
|
||
struct re_registers *regs;
|
||
int stop;
|
||
{
|
||
int val;
|
||
register char *fastmap = bufp->fastmap;
|
||
register char *translate = bufp->translate;
|
||
int total_size = size1 + size2;
|
||
int endpos = startpos + range;
|
||
|
||
/* Check for out-of-range STARTPOS. */
|
||
if (startpos < 0 || startpos > total_size)
|
||
return -1;
|
||
|
||
/* Fix up RANGE if it might eventually take us outside
|
||
the virtual concatenation of STRING1 and STRING2. */
|
||
if (endpos < -1)
|
||
range = -1 - startpos;
|
||
else if (endpos > total_size)
|
||
range = total_size - startpos;
|
||
|
||
/* If the search isn't to be a backwards one, don't waste time in a
|
||
search for a pattern that must be anchored. */
|
||
if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == begbuf && range > 0)
|
||
{
|
||
if (startpos > 0)
|
||
return -1;
|
||
else
|
||
range = 1;
|
||
}
|
||
|
||
/* Update the fastmap now if not correct already. */
|
||
if (fastmap && !bufp->fastmap_accurate)
|
||
if (re_compile_fastmap (bufp) == -2)
|
||
return -2;
|
||
|
||
/* Loop through the string, looking for a place to start matching. */
|
||
for (;;)
|
||
{
|
||
/* If a fastmap is supplied, skip quickly over characters that
|
||
cannot be the start of a match. If the pattern can match the
|
||
null string, however, we don't need to skip characters; we want
|
||
the first null string. */
|
||
if (fastmap && startpos < total_size && !bufp->can_be_null)
|
||
{
|
||
if (range > 0) /* Searching forwards. */
|
||
{
|
||
register const char *d;
|
||
register int lim = 0;
|
||
int irange = range;
|
||
|
||
if (startpos < size1 && startpos + range >= size1)
|
||
lim = range - (size1 - startpos);
|
||
|
||
d = (startpos >= size1 ? string2 - size1 : string1) + startpos;
|
||
|
||
/* Written out as an if-else to avoid testing `translate'
|
||
inside the loop. */
|
||
if (translate)
|
||
while (range > lim
|
||
&& !fastmap[(unsigned char)
|
||
translate[(unsigned char) *d++]])
|
||
range--;
|
||
else
|
||
while (range > lim && !fastmap[(unsigned char) *d++])
|
||
range--;
|
||
|
||
startpos += irange - range;
|
||
}
|
||
else /* Searching backwards. */
|
||
{
|
||
register char c = (size1 == 0 || startpos >= size1
|
||
? string2[startpos - size1]
|
||
: string1[startpos]);
|
||
|
||
if (!fastmap[(unsigned char) TRANSLATE (c)])
|
||
goto advance;
|
||
}
|
||
}
|
||
|
||
/* If can't match the null string, and that's all we have left, fail. */
|
||
if (range >= 0 && startpos == total_size && fastmap
|
||
&& !bufp->can_be_null)
|
||
return -1;
|
||
|
||
val = re_match_2 (bufp, string1, size1, string2, size2,
|
||
startpos, regs, stop);
|
||
if (val >= 0)
|
||
return startpos;
|
||
|
||
if (val == -2)
|
||
return -2;
|
||
|
||
advance:
|
||
if (!range)
|
||
break;
|
||
else if (range > 0)
|
||
{
|
||
range--;
|
||
startpos++;
|
||
}
|
||
else
|
||
{
|
||
range++;
|
||
startpos--;
|
||
}
|
||
}
|
||
return -1;
|
||
} /* re_search_2 */
|
||
|
||
/* Declarations and macros for re_match_2. */
|
||
|
||
static int bcmp_translate ();
|
||
static boolean alt_match_null_string_p (),
|
||
common_op_match_null_string_p (),
|
||
group_match_null_string_p ();
|
||
|
||
/* Structure for per-register (a.k.a. per-group) information.
|
||
This must not be longer than one word, because we push this value
|
||
onto the failure stack. Other register information, such as the
|
||
starting and ending positions (which are addresses), and the list of
|
||
inner groups (which is a bits list) are maintained in separate
|
||
variables.
|
||
|
||
We are making a (strictly speaking) nonportable assumption here: that
|
||
the compiler will pack our bit fields into something that fits into
|
||
the type of `word', i.e., is something that fits into one item on the
|
||
failure stack. */
|
||
typedef union
|
||
{
|
||
fail_stack_elt_t word;
|
||
struct
|
||
{
|
||
/* This field is one if this group can match the empty string,
|
||
zero if not. If not yet determined, `MATCH_NULL_UNSET_VALUE'. */
|
||
#define MATCH_NULL_UNSET_VALUE 3
|
||
unsigned match_null_string_p : 2;
|
||
unsigned is_active : 1;
|
||
unsigned matched_something : 1;
|
||
unsigned ever_matched_something : 1;
|
||
} bits;
|
||
} register_info_type;
|
||
|
||
#define REG_MATCH_NULL_STRING_P(R) ((R).bits.match_null_string_p)
|
||
#define IS_ACTIVE(R) ((R).bits.is_active)
|
||
#define MATCHED_SOMETHING(R) ((R).bits.matched_something)
|
||
#define EVER_MATCHED_SOMETHING(R) ((R).bits.ever_matched_something)
|
||
|
||
|
||
/* Call this when have matched a real character; it sets `matched' flags
|
||
for the subexpressions which we are currently inside. Also records
|
||
that those subexprs have matched. */
|
||
#define SET_REGS_MATCHED() \
|
||
do \
|
||
{ \
|
||
unsigned r; \
|
||
for (r = lowest_active_reg; r <= highest_active_reg; r++) \
|
||
{ \
|
||
MATCHED_SOMETHING (reg_info[r]) \
|
||
= EVER_MATCHED_SOMETHING (reg_info[r]) \
|
||
= 1; \
|
||
} \
|
||
} \
|
||
while (0)
|
||
|
||
|
||
/* This converts PTR, a pointer into one of the search strings `string1'
|
||
and `string2' into an offset from the beginning of that string. */
|
||
#define POINTER_TO_OFFSET(ptr) \
|
||
(FIRST_STRING_P (ptr) ? (ptr) - string1 : (ptr) - string2 + size1)
|
||
|
||
/* Registers are set to a sentinel when they haven't yet matched. */
|
||
#define REG_UNSET_VALUE ((char *) -1)
|
||
#define REG_UNSET(e) ((e) == REG_UNSET_VALUE)
|
||
|
||
|
||
/* Macros for dealing with the split strings in re_match_2. */
|
||
|
||
#define MATCHING_IN_FIRST_STRING (dend == end_match_1)
|
||
|
||
/* Call before fetching a character with *d. This switches over to
|
||
string2 if necessary. */
|
||
#define PREFETCH() \
|
||
while (d == dend) \
|
||
{ \
|
||
/* End of string2 => fail. */ \
|
||
if (dend == end_match_2) \
|
||
goto fail; \
|
||
/* End of string1 => advance to string2. */ \
|
||
d = string2; \
|
||
dend = end_match_2; \
|
||
}
|
||
|
||
|
||
/* Test if at very beginning or at very end of the virtual concatenation
|
||
of `string1' and `string2'. If only one string, it's `string2'. */
|
||
#define AT_STRINGS_BEG(d) ((d) == (size1 ? string1 : string2) || !size2)
|
||
#define AT_STRINGS_END(d) ((d) == end2)
|
||
|
||
|
||
/* Test if D points to a character which is word-constituent. We have
|
||
two special cases to check for: if past the end of string1, look at
|
||
the first character in string2; and if before the beginning of
|
||
string2, look at the last character in string1. */
|
||
#define WORDCHAR_P(d) \
|
||
(SYNTAX ((d) == end1 ? *string2 \
|
||
: (d) == string2 - 1 ? *(end1 - 1) : *(d)) \
|
||
== Sword)
|
||
|
||
/* Test if the character before D and the one at D differ with respect
|
||
to being word-constituent. */
|
||
#define AT_WORD_BOUNDARY(d) \
|
||
(AT_STRINGS_BEG (d) || AT_STRINGS_END (d) \
|
||
|| WORDCHAR_P (d - 1) != WORDCHAR_P (d))
|
||
|
||
|
||
/* Free everything we malloc. */
|
||
#ifdef REGEX_MALLOC
|
||
#define FREE_VAR(var) if (var) free (var); var = NULL
|
||
#define FREE_VARIABLES() \
|
||
do { \
|
||
FREE_VAR (fail_stack.stack); \
|
||
FREE_VAR (regstart); \
|
||
FREE_VAR (regend); \
|
||
FREE_VAR (old_regstart); \
|
||
FREE_VAR (old_regend); \
|
||
FREE_VAR (best_regstart); \
|
||
FREE_VAR (best_regend); \
|
||
FREE_VAR (reg_info); \
|
||
FREE_VAR (reg_dummy); \
|
||
FREE_VAR (reg_info_dummy); \
|
||
} while (0)
|
||
#else /* not REGEX_MALLOC */
|
||
/* Some MIPS systems (at least) want this to free alloca'd storage. */
|
||
#define FREE_VARIABLES() alloca (0)
|
||
#endif /* not REGEX_MALLOC */
|
||
|
||
|
||
/* These values must meet several constraints. They must not be valid
|
||
register values; since we have a limit of 255 registers (because
|
||
we use only one byte in the pattern for the register number), we can
|
||
use numbers larger than 255. They must differ by 1, because of
|
||
NUM_FAILURE_ITEMS above. And the value for the lowest register must
|
||
be larger than the value for the highest register, so we do not try
|
||
to actually save any registers when none are active. */
|
||
#define NO_HIGHEST_ACTIVE_REG (1 << BYTEWIDTH)
|
||
#define NO_LOWEST_ACTIVE_REG (NO_HIGHEST_ACTIVE_REG + 1)
|
||
|
||
/* Matching routines. */
|
||
|
||
#ifndef emacs /* Emacs never uses this. */
|
||
/* re_match is like re_match_2 except it takes only a single string. */
|
||
|
||
int
|
||
re_match (bufp, string, size, pos, regs)
|
||
struct re_pattern_buffer *bufp;
|
||
const char *string;
|
||
int size, pos;
|
||
struct re_registers *regs;
|
||
{
|
||
return re_match_2 (bufp, NULL, 0, string, size, pos, regs, size);
|
||
}
|
||
#endif /* not emacs */
|
||
|
||
|
||
/* re_match_2 matches the compiled pattern in BUFP against the
|
||
the (virtual) concatenation of STRING1 and STRING2 (of length SIZE1
|
||
and SIZE2, respectively). We start matching at POS, and stop
|
||
matching at STOP.
|
||
|
||
If REGS is non-null and the `no_sub' field of BUFP is nonzero, we
|
||
store offsets for the substring each group matched in REGS. See the
|
||
documentation for exactly how many groups we fill.
|
||
|
||
We return -1 if no match, -2 if an internal error (such as the
|
||
failure stack overflowing). Otherwise, we return the length of the
|
||
matched substring. */
|
||
|
||
int
|
||
re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop)
|
||
struct re_pattern_buffer *bufp;
|
||
const char *string1, *string2;
|
||
int size1, size2;
|
||
int pos;
|
||
struct re_registers *regs;
|
||
int stop;
|
||
{
|
||
/* General temporaries. */
|
||
int mcnt;
|
||
unsigned char *p1;
|
||
|
||
/* Just past the end of the corresponding string. */
|
||
const char *end1, *end2;
|
||
|
||
/* Pointers into string1 and string2, just past the last characters in
|
||
each to consider matching. */
|
||
const char *end_match_1, *end_match_2;
|
||
|
||
/* Where we are in the data, and the end of the current string. */
|
||
const char *d, *dend;
|
||
|
||
/* Where we are in the pattern, and the end of the pattern. */
|
||
unsigned char *p = bufp->buffer;
|
||
register unsigned char *pend = p + bufp->used;
|
||
|
||
/* We use this to map every character in the string. */
|
||
char *translate = bufp->translate;
|
||
|
||
/* Failure point stack. Each place that can handle a failure further
|
||
down the line pushes a failure point on this stack. It consists of
|
||
restart, regend, and reg_info for all registers corresponding to
|
||
the subexpressions we're currently inside, plus the number of such
|
||
registers, and, finally, two char *'s. The first char * is where
|
||
to resume scanning the pattern; the second one is where to resume
|
||
scanning the strings. If the latter is zero, the failure point is
|
||
a ``dummy''; if a failure happens and the failure point is a dummy,
|
||
it gets discarded and the next next one is tried. */
|
||
fail_stack_type fail_stack;
|
||
#ifdef DEBUG
|
||
static unsigned failure_id = 0;
|
||
unsigned nfailure_points_pushed = 0, nfailure_points_popped = 0;
|
||
#endif
|
||
|
||
/* We fill all the registers internally, independent of what we
|
||
return, for use in backreferences. The number here includes
|
||
an element for register zero. */
|
||
unsigned num_regs = bufp->re_nsub + 1;
|
||
|
||
/* The currently active registers. */
|
||
unsigned lowest_active_reg = NO_LOWEST_ACTIVE_REG;
|
||
unsigned highest_active_reg = NO_HIGHEST_ACTIVE_REG;
|
||
|
||
/* Information on the contents of registers. These are pointers into
|
||
the input strings; they record just what was matched (on this
|
||
attempt) by a subexpression part of the pattern, that is, the
|
||
regnum-th regstart pointer points to where in the pattern we began
|
||
matching and the regnum-th regend points to right after where we
|
||
stopped matching the regnum-th subexpression. (The zeroth register
|
||
keeps track of what the whole pattern matches.) */
|
||
const char **regstart = NULL, **regend = NULL;
|
||
|
||
/* If a group that's operated upon by a repetition operator fails to
|
||
match anything, then the register for its start will need to be
|
||
restored because it will have been set to wherever in the string we
|
||
are when we last see its open-group operator. Similarly for a
|
||
register's end. */
|
||
const char **old_regstart = NULL, **old_regend = NULL;
|
||
|
||
/* The is_active field of reg_info helps us keep track of which (possibly
|
||
nested) subexpressions we are currently in. The matched_something
|
||
field of reg_info[reg_num] helps us tell whether or not we have
|
||
matched any of the pattern so far this time through the reg_num-th
|
||
subexpression. These two fields get reset each time through any
|
||
loop their register is in. */
|
||
register_info_type *reg_info = NULL;
|
||
|
||
/* The following record the register info as found in the above
|
||
variables when we find a match better than any we've seen before.
|
||
This happens as we backtrack through the failure points, which in
|
||
turn happens only if we have not yet matched the entire string. */
|
||
unsigned best_regs_set = false;
|
||
const char **best_regstart = NULL, **best_regend = NULL;
|
||
|
||
/* Logically, this is `best_regend[0]'. But we don't want to have to
|
||
allocate space for that if we're not allocating space for anything
|
||
else (see below). Also, we never need info about register 0 for
|
||
any of the other register vectors, and it seems rather a kludge to
|
||
treat `best_regend' differently than the rest. So we keep track of
|
||
the end of the best match so far in a separate variable. We
|
||
initialize this to NULL so that when we backtrack the first time
|
||
and need to test it, it's not garbage. */
|
||
const char *match_end = NULL;
|
||
|
||
/* Used when we pop values we don't care about. */
|
||
const char **reg_dummy = NULL;
|
||
register_info_type *reg_info_dummy = NULL;
|
||
|
||
#ifdef DEBUG
|
||
/* Counts the total number of registers pushed. */
|
||
unsigned num_regs_pushed = 0;
|
||
#endif
|
||
|
||
DEBUG_PRINT1 ("\n\nEntering re_match_2.\n");
|
||
|
||
INIT_FAIL_STACK ();
|
||
|
||
/* Do not bother to initialize all the register variables if there are
|
||
no groups in the pattern, as it takes a fair amount of time. If
|
||
there are groups, we include space for register 0 (the whole
|
||
pattern), even though we never use it, since it simplifies the
|
||
array indexing. We should fix this. */
|
||
if (bufp->re_nsub)
|
||
{
|
||
regstart = REGEX_TALLOC (num_regs, const char *);
|
||
regend = REGEX_TALLOC (num_regs, const char *);
|
||
old_regstart = REGEX_TALLOC (num_regs, const char *);
|
||
old_regend = REGEX_TALLOC (num_regs, const char *);
|
||
best_regstart = REGEX_TALLOC (num_regs, const char *);
|
||
best_regend = REGEX_TALLOC (num_regs, const char *);
|
||
reg_info = REGEX_TALLOC (num_regs, register_info_type);
|
||
reg_dummy = REGEX_TALLOC (num_regs, const char *);
|
||
reg_info_dummy = REGEX_TALLOC (num_regs, register_info_type);
|
||
|
||
if (!(regstart && regend && old_regstart && old_regend && reg_info
|
||
&& best_regstart && best_regend && reg_dummy && reg_info_dummy))
|
||
{
|
||
FREE_VARIABLES ();
|
||
return -2;
|
||
}
|
||
}
|
||
#ifdef REGEX_MALLOC
|
||
else
|
||
{
|
||
/* We must initialize all our variables to NULL, so that
|
||
`FREE_VARIABLES' doesn't try to free them. */
|
||
regstart = regend = old_regstart = old_regend = best_regstart
|
||
= best_regend = reg_dummy = NULL;
|
||
reg_info = reg_info_dummy = (register_info_type *) NULL;
|
||
}
|
||
#endif /* REGEX_MALLOC */
|
||
|
||
/* The starting position is bogus. */
|
||
if (pos < 0 || pos > size1 + size2)
|
||
{
|
||
FREE_VARIABLES ();
|
||
return -1;
|
||
}
|
||
|
||
/* Initialize subexpression text positions to -1 to mark ones that no
|
||
start_memory/stop_memory has been seen for. Also initialize the
|
||
register information struct. */
|
||
for (mcnt = 1; mcnt < num_regs; mcnt++)
|
||
{
|
||
regstart[mcnt] = regend[mcnt]
|
||
= old_regstart[mcnt] = old_regend[mcnt] = REG_UNSET_VALUE;
|
||
|
||
REG_MATCH_NULL_STRING_P (reg_info[mcnt]) = MATCH_NULL_UNSET_VALUE;
|
||
IS_ACTIVE (reg_info[mcnt]) = 0;
|
||
MATCHED_SOMETHING (reg_info[mcnt]) = 0;
|
||
EVER_MATCHED_SOMETHING (reg_info[mcnt]) = 0;
|
||
}
|
||
|
||
/* We move `string1' into `string2' if the latter's empty -- but not if
|
||
`string1' is null. */
|
||
if (size2 == 0 && string1 != NULL)
|
||
{
|
||
string2 = string1;
|
||
size2 = size1;
|
||
string1 = 0;
|
||
size1 = 0;
|
||
}
|
||
end1 = string1 + size1;
|
||
end2 = string2 + size2;
|
||
|
||
/* Compute where to stop matching, within the two strings. */
|
||
if (stop <= size1)
|
||
{
|
||
end_match_1 = string1 + stop;
|
||
end_match_2 = string2;
|
||
}
|
||
else
|
||
{
|
||
end_match_1 = end1;
|
||
end_match_2 = string2 + stop - size1;
|
||
}
|
||
|
||
/* `p' scans through the pattern as `d' scans through the data.
|
||
`dend' is the end of the input string that `d' points within. `d'
|
||
is advanced into the following input string whenever necessary, but
|
||
this happens before fetching; therefore, at the beginning of the
|
||
loop, `d' can be pointing at the end of a string, but it cannot
|
||
equal `string2'. */
|
||
if (size1 > 0 && pos <= size1)
|
||
{
|
||
d = string1 + pos;
|
||
dend = end_match_1;
|
||
}
|
||
else
|
||
{
|
||
d = string2 + pos - size1;
|
||
dend = end_match_2;
|
||
}
|
||
|
||
DEBUG_PRINT1 ("The compiled pattern is: ");
|
||
DEBUG_PRINT_COMPILED_PATTERN (bufp, p, pend);
|
||
DEBUG_PRINT1 ("The string to match is: `");
|
||
DEBUG_PRINT_DOUBLE_STRING (d, string1, size1, string2, size2);
|
||
DEBUG_PRINT1 ("'\n");
|
||
|
||
/* This loops over pattern commands. It exits by returning from the
|
||
function if the match is complete, or it drops through if the match
|
||
fails at this starting point in the input data. */
|
||
for (;;)
|
||
{
|
||
DEBUG_PRINT2 ("\n0x%x: ", p);
|
||
|
||
if (p == pend)
|
||
{ /* End of pattern means we might have succeeded. */
|
||
DEBUG_PRINT1 ("end of pattern ... ");
|
||
|
||
/* If we haven't matched the entire string, and we want the
|
||
longest match, try backtracking. */
|
||
if (d != end_match_2)
|
||
{
|
||
DEBUG_PRINT1 ("backtracking.\n");
|
||
|
||
if (!FAIL_STACK_EMPTY ())
|
||
{ /* More failure points to try. */
|
||
boolean same_str_p = (FIRST_STRING_P (match_end)
|
||
== MATCHING_IN_FIRST_STRING);
|
||
|
||
/* If exceeds best match so far, save it. */
|
||
if (!best_regs_set
|
||
|| (same_str_p && d > match_end)
|
||
|| (!same_str_p && !MATCHING_IN_FIRST_STRING))
|
||
{
|
||
best_regs_set = true;
|
||
match_end = d;
|
||
|
||
DEBUG_PRINT1 ("\nSAVING match as best so far.\n");
|
||
|
||
for (mcnt = 1; mcnt < num_regs; mcnt++)
|
||
{
|
||
best_regstart[mcnt] = regstart[mcnt];
|
||
best_regend[mcnt] = regend[mcnt];
|
||
}
|
||
}
|
||
goto fail;
|
||
}
|
||
|
||
/* If no failure points, don't restore garbage. */
|
||
else if (best_regs_set)
|
||
{
|
||
restore_best_regs:
|
||
/* Restore best match. It may happen that `dend ==
|
||
end_match_1' while the restored d is in string2.
|
||
For example, the pattern `x.*y.*z' against the
|
||
strings `x-' and `y-z-', if the two strings are
|
||
not consecutive in memory. */
|
||
DEBUG_PRINT1 ("Restoring best registers.\n");
|
||
|
||
d = match_end;
|
||
dend = ((d >= string1 && d <= end1)
|
||
? end_match_1 : end_match_2);
|
||
|
||
for (mcnt = 1; mcnt < num_regs; mcnt++)
|
||
{
|
||
regstart[mcnt] = best_regstart[mcnt];
|
||
regend[mcnt] = best_regend[mcnt];
|
||
}
|
||
}
|
||
} /* d != end_match_2 */
|
||
|
||
DEBUG_PRINT1 ("Accepting match.\n");
|
||
|
||
/* If caller wants register contents data back, do it. */
|
||
if (regs && !bufp->no_sub)
|
||
{
|
||
/* Have the register data arrays been allocated? */
|
||
if (bufp->regs_allocated == REGS_UNALLOCATED)
|
||
{ /* No. So allocate them with malloc. We need one
|
||
extra element beyond `num_regs' for the `-1' marker
|
||
GNU code uses. */
|
||
regs->num_regs = MAX (RE_NREGS, num_regs + 1);
|
||
regs->start = TALLOC (regs->num_regs, regoff_t);
|
||
regs->end = TALLOC (regs->num_regs, regoff_t);
|
||
if (regs->start == NULL || regs->end == NULL)
|
||
return -2;
|
||
bufp->regs_allocated = REGS_REALLOCATE;
|
||
}
|
||
else if (bufp->regs_allocated == REGS_REALLOCATE)
|
||
{ /* Yes. If we need more elements than were already
|
||
allocated, reallocate them. If we need fewer, just
|
||
leave it alone. */
|
||
if (regs->num_regs < num_regs + 1)
|
||
{
|
||
regs->num_regs = num_regs + 1;
|
||
RETALLOC (regs->start, regs->num_regs, regoff_t);
|
||
RETALLOC (regs->end, regs->num_regs, regoff_t);
|
||
if (regs->start == NULL || regs->end == NULL)
|
||
return -2;
|
||
}
|
||
}
|
||
else
|
||
assert (bufp->regs_allocated == REGS_FIXED);
|
||
|
||
/* Convert the pointer data in `regstart' and `regend' to
|
||
indices. Register zero has to be set differently,
|
||
since we haven't kept track of any info for it. */
|
||
if (regs->num_regs > 0)
|
||
{
|
||
regs->start[0] = pos;
|
||
regs->end[0] = (MATCHING_IN_FIRST_STRING ? d - string1
|
||
: d - string2 + size1);
|
||
}
|
||
|
||
/* Go through the first `min (num_regs, regs->num_regs)'
|
||
registers, since that is all we initialized. */
|
||
for (mcnt = 1; mcnt < MIN (num_regs, regs->num_regs); mcnt++)
|
||
{
|
||
if (REG_UNSET (regstart[mcnt]) || REG_UNSET (regend[mcnt]))
|
||
regs->start[mcnt] = regs->end[mcnt] = -1;
|
||
else
|
||
{
|
||
regs->start[mcnt] = POINTER_TO_OFFSET (regstart[mcnt]);
|
||
regs->end[mcnt] = POINTER_TO_OFFSET (regend[mcnt]);
|
||
}
|
||
}
|
||
|
||
/* If the regs structure we return has more elements than
|
||
were in the pattern, set the extra elements to -1. If
|
||
we (re)allocated the registers, this is the case,
|
||
because we always allocate enough to have at least one
|
||
-1 at the end. */
|
||
for (mcnt = num_regs; mcnt < regs->num_regs; mcnt++)
|
||
regs->start[mcnt] = regs->end[mcnt] = -1;
|
||
} /* regs && !bufp->no_sub */
|
||
|
||
FREE_VARIABLES ();
|
||
DEBUG_PRINT4 ("%u failure points pushed, %u popped (%u remain).\n",
|
||
nfailure_points_pushed, nfailure_points_popped,
|
||
nfailure_points_pushed - nfailure_points_popped);
|
||
DEBUG_PRINT2 ("%u registers pushed.\n", num_regs_pushed);
|
||
|
||
mcnt = d - pos - (MATCHING_IN_FIRST_STRING
|
||
? string1
|
||
: string2 - size1);
|
||
|
||
DEBUG_PRINT2 ("Returning %d from re_match_2.\n", mcnt);
|
||
|
||
return mcnt;
|
||
}
|
||
|
||
/* Otherwise match next pattern command. */
|
||
#ifdef SWITCH_ENUM_BUG
|
||
switch ((int) ((re_opcode_t) *p++))
|
||
#else
|
||
switch ((re_opcode_t) *p++)
|
||
#endif
|
||
{
|
||
/* Ignore these. Used to ignore the n of succeed_n's which
|
||
currently have n == 0. */
|
||
case no_op:
|
||
DEBUG_PRINT1 ("EXECUTING no_op.\n");
|
||
break;
|
||
|
||
|
||
/* Match the next n pattern characters exactly. The following
|
||
byte in the pattern defines n, and the n bytes after that
|
||
are the characters to match. */
|
||
case exactn:
|
||
mcnt = *p++;
|
||
DEBUG_PRINT2 ("EXECUTING exactn %d.\n", mcnt);
|
||
|
||
/* This is written out as an if-else so we don't waste time
|
||
testing `translate' inside the loop. */
|
||
if (translate)
|
||
{
|
||
do
|
||
{
|
||
PREFETCH ();
|
||
if (translate[(unsigned char) *d++] != (char) *p++)
|
||
goto fail;
|
||
}
|
||
while (--mcnt);
|
||
}
|
||
else
|
||
{
|
||
do
|
||
{
|
||
PREFETCH ();
|
||
if (*d++ != (char) *p++) goto fail;
|
||
}
|
||
while (--mcnt);
|
||
}
|
||
SET_REGS_MATCHED ();
|
||
break;
|
||
|
||
|
||
/* Match any character except possibly a newline or a null. */
|
||
case anychar:
|
||
DEBUG_PRINT1 ("EXECUTING anychar.\n");
|
||
|
||
PREFETCH ();
|
||
|
||
if ((!(bufp->syntax & RE_DOT_NEWLINE) && TRANSLATE (*d) == '\n')
|
||
|| (bufp->syntax & RE_DOT_NOT_NULL && TRANSLATE (*d) == '\000'))
|
||
goto fail;
|
||
|
||
SET_REGS_MATCHED ();
|
||
DEBUG_PRINT2 (" Matched `%d'.\n", *d);
|
||
d++;
|
||
break;
|
||
|
||
|
||
case charset:
|
||
case charset_not:
|
||
{
|
||
register unsigned char c;
|
||
boolean not = (re_opcode_t) *(p - 1) == charset_not;
|
||
|
||
DEBUG_PRINT2 ("EXECUTING charset%s.\n", not ? "_not" : "");
|
||
|
||
PREFETCH ();
|
||
c = TRANSLATE (*d); /* The character to match. */
|
||
|
||
/* Cast to `unsigned' instead of `unsigned char' in case the
|
||
bit list is a full 32 bytes long. */
|
||
if (c < (unsigned) (*p * BYTEWIDTH)
|
||
&& p[1 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH)))
|
||
not = !not;
|
||
|
||
p += 1 + *p;
|
||
|
||
if (!not) goto fail;
|
||
|
||
SET_REGS_MATCHED ();
|
||
d++;
|
||
break;
|
||
}
|
||
|
||
|
||
/* The beginning of a group is represented by start_memory.
|
||
The arguments are the register number in the next byte, and the
|
||
number of groups inner to this one in the next. The text
|
||
matched within the group is recorded (in the internal
|
||
registers data structure) under the register number. */
|
||
case start_memory:
|
||
DEBUG_PRINT3 ("EXECUTING start_memory %d (%d):\n", *p, p[1]);
|
||
|
||
/* Find out if this group can match the empty string. */
|
||
p1 = p; /* To send to group_match_null_string_p. */
|
||
|
||
if (REG_MATCH_NULL_STRING_P (reg_info[*p]) == MATCH_NULL_UNSET_VALUE)
|
||
REG_MATCH_NULL_STRING_P (reg_info[*p])
|
||
= group_match_null_string_p (&p1, pend, reg_info);
|
||
|
||
/* Save the position in the string where we were the last time
|
||
we were at this open-group operator in case the group is
|
||
operated upon by a repetition operator, e.g., with `(a*)*b'
|
||
against `ab'; then we want to ignore where we are now in
|
||
the string in case this attempt to match fails. */
|
||
old_regstart[*p] = REG_MATCH_NULL_STRING_P (reg_info[*p])
|
||
? REG_UNSET (regstart[*p]) ? d : regstart[*p]
|
||
: regstart[*p];
|
||
DEBUG_PRINT2 (" old_regstart: %d\n",
|
||
POINTER_TO_OFFSET (old_regstart[*p]));
|
||
|
||
regstart[*p] = d;
|
||
DEBUG_PRINT2 (" regstart: %d\n", POINTER_TO_OFFSET (regstart[*p]));
|
||
|
||
IS_ACTIVE (reg_info[*p]) = 1;
|
||
MATCHED_SOMETHING (reg_info[*p]) = 0;
|
||
|
||
/* This is the new highest active register. */
|
||
highest_active_reg = *p;
|
||
|
||
/* If nothing was active before, this is the new lowest active
|
||
register. */
|
||
if (lowest_active_reg == NO_LOWEST_ACTIVE_REG)
|
||
lowest_active_reg = *p;
|
||
|
||
/* Move past the register number and inner group count. */
|
||
p += 2;
|
||
break;
|
||
|
||
|
||
/* The stop_memory opcode represents the end of a group. Its
|
||
arguments are the same as start_memory's: the register
|
||
number, and the number of inner groups. */
|
||
case stop_memory:
|
||
DEBUG_PRINT3 ("EXECUTING stop_memory %d (%d):\n", *p, p[1]);
|
||
|
||
/* We need to save the string position the last time we were at
|
||
this close-group operator in case the group is operated
|
||
upon by a repetition operator, e.g., with `((a*)*(b*)*)*'
|
||
against `aba'; then we want to ignore where we are now in
|
||
the string in case this attempt to match fails. */
|
||
old_regend[*p] = REG_MATCH_NULL_STRING_P (reg_info[*p])
|
||
? REG_UNSET (regend[*p]) ? d : regend[*p]
|
||
: regend[*p];
|
||
DEBUG_PRINT2 (" old_regend: %d\n",
|
||
POINTER_TO_OFFSET (old_regend[*p]));
|
||
|
||
regend[*p] = d;
|
||
DEBUG_PRINT2 (" regend: %d\n", POINTER_TO_OFFSET (regend[*p]));
|
||
|
||
/* This register isn't active anymore. */
|
||
IS_ACTIVE (reg_info[*p]) = 0;
|
||
|
||
/* If this was the only register active, nothing is active
|
||
anymore. */
|
||
if (lowest_active_reg == highest_active_reg)
|
||
{
|
||
lowest_active_reg = NO_LOWEST_ACTIVE_REG;
|
||
highest_active_reg = NO_HIGHEST_ACTIVE_REG;
|
||
}
|
||
else
|
||
{ /* We must scan for the new highest active register, since
|
||
it isn't necessarily one less than now: consider
|
||
(a(b)c(d(e)f)g). When group 3 ends, after the f), the
|
||
new highest active register is 1. */
|
||
unsigned char r = *p - 1;
|
||
while (r > 0 && !IS_ACTIVE (reg_info[r]))
|
||
r--;
|
||
|
||
/* If we end up at register zero, that means that we saved
|
||
the registers as the result of an `on_failure_jump', not
|
||
a `start_memory', and we jumped to past the innermost
|
||
`stop_memory'. For example, in ((.)*) we save
|
||
registers 1 and 2 as a result of the *, but when we pop
|
||
back to the second ), we are at the stop_memory 1.
|
||
Thus, nothing is active. */
|
||
if (r == 0)
|
||
{
|
||
lowest_active_reg = NO_LOWEST_ACTIVE_REG;
|
||
highest_active_reg = NO_HIGHEST_ACTIVE_REG;
|
||
}
|
||
else
|
||
highest_active_reg = r;
|
||
}
|
||
|
||
/* If just failed to match something this time around with a
|
||
group that's operated on by a repetition operator, try to
|
||
force exit from the ``loop'', and restore the register
|
||
information for this group that we had before trying this
|
||
last match. */
|
||
if ((!MATCHED_SOMETHING (reg_info[*p])
|
||
|| (re_opcode_t) p[-3] == start_memory)
|
||
&& (p + 2) < pend)
|
||
{
|
||
boolean is_a_jump_n = false;
|
||
|
||
p1 = p + 2;
|
||
mcnt = 0;
|
||
switch ((re_opcode_t) *p1++)
|
||
{
|
||
case jump_n:
|
||
is_a_jump_n = true;
|
||
case pop_failure_jump:
|
||
case maybe_pop_jump:
|
||
case jump:
|
||
case dummy_failure_jump:
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
if (is_a_jump_n)
|
||
p1 += 2;
|
||
break;
|
||
|
||
default:
|
||
/* do nothing */ ;
|
||
}
|
||
p1 += mcnt;
|
||
|
||
/* If the next operation is a jump backwards in the pattern
|
||
to an on_failure_jump right before the start_memory
|
||
corresponding to this stop_memory, exit from the loop
|
||
by forcing a failure after pushing on the stack the
|
||
on_failure_jump's jump in the pattern, and d. */
|
||
if (mcnt < 0 && (re_opcode_t) *p1 == on_failure_jump
|
||
&& (re_opcode_t) p1[3] == start_memory && p1[4] == *p)
|
||
{
|
||
/* If this group ever matched anything, then restore
|
||
what its registers were before trying this last
|
||
failed match, e.g., with `(a*)*b' against `ab' for
|
||
regstart[1], and, e.g., with `((a*)*(b*)*)*'
|
||
against `aba' for regend[3].
|
||
|
||
Also restore the registers for inner groups for,
|
||
e.g., `((a*)(b*))*' against `aba' (register 3 would
|
||
otherwise get trashed). */
|
||
|
||
if (EVER_MATCHED_SOMETHING (reg_info[*p]))
|
||
{
|
||
unsigned r;
|
||
|
||
EVER_MATCHED_SOMETHING (reg_info[*p]) = 0;
|
||
|
||
/* Restore this and inner groups' (if any) registers. */
|
||
for (r = *p; r < *p + *(p + 1); r++)
|
||
{
|
||
regstart[r] = old_regstart[r];
|
||
|
||
/* xx why this test? */
|
||
if ((int) old_regend[r] >= (int) regstart[r])
|
||
regend[r] = old_regend[r];
|
||
}
|
||
}
|
||
p1++;
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
PUSH_FAILURE_POINT (p1 + mcnt, d, -2);
|
||
|
||
goto fail;
|
||
}
|
||
}
|
||
|
||
/* Move past the register number and the inner group count. */
|
||
p += 2;
|
||
break;
|
||
|
||
|
||
/* \<digit> has been turned into a `duplicate' command which is
|
||
followed by the numeric value of <digit> as the register number. */
|
||
case duplicate:
|
||
{
|
||
register const char *d2, *dend2;
|
||
int regno = *p++; /* Get which register to match against. */
|
||
DEBUG_PRINT2 ("EXECUTING duplicate %d.\n", regno);
|
||
|
||
/* Can't back reference a group which we've never matched. */
|
||
if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno]))
|
||
goto fail;
|
||
|
||
/* Where in input to try to start matching. */
|
||
d2 = regstart[regno];
|
||
|
||
/* Where to stop matching; if both the place to start and
|
||
the place to stop matching are in the same string, then
|
||
set to the place to stop, otherwise, for now have to use
|
||
the end of the first string. */
|
||
|
||
dend2 = ((FIRST_STRING_P (regstart[regno])
|
||
== FIRST_STRING_P (regend[regno]))
|
||
? regend[regno] : end_match_1);
|
||
for (;;)
|
||
{
|
||
/* If necessary, advance to next segment in register
|
||
contents. */
|
||
while (d2 == dend2)
|
||
{
|
||
if (dend2 == end_match_2) break;
|
||
if (dend2 == regend[regno]) break;
|
||
|
||
/* End of string1 => advance to string2. */
|
||
d2 = string2;
|
||
dend2 = regend[regno];
|
||
}
|
||
/* At end of register contents => success */
|
||
if (d2 == dend2) break;
|
||
|
||
/* If necessary, advance to next segment in data. */
|
||
PREFETCH ();
|
||
|
||
/* How many characters left in this segment to match. */
|
||
mcnt = dend - d;
|
||
|
||
/* Want how many consecutive characters we can match in
|
||
one shot, so, if necessary, adjust the count. */
|
||
if (mcnt > dend2 - d2)
|
||
mcnt = dend2 - d2;
|
||
|
||
/* Compare that many; failure if mismatch, else move
|
||
past them. */
|
||
if (translate
|
||
? bcmp_translate (d, d2, mcnt, translate)
|
||
: bcmp (d, d2, mcnt))
|
||
goto fail;
|
||
d += mcnt, d2 += mcnt;
|
||
}
|
||
}
|
||
break;
|
||
|
||
|
||
/* begline matches the empty string at the beginning of the string
|
||
(unless `not_bol' is set in `bufp'), and, if
|
||
`newline_anchor' is set, after newlines. */
|
||
case begline:
|
||
DEBUG_PRINT1 ("EXECUTING begline.\n");
|
||
|
||
if (AT_STRINGS_BEG (d))
|
||
{
|
||
if (!bufp->not_bol) break;
|
||
}
|
||
else if (d[-1] == '\n' && bufp->newline_anchor)
|
||
{
|
||
break;
|
||
}
|
||
/* In all other cases, we fail. */
|
||
goto fail;
|
||
|
||
|
||
/* endline is the dual of begline. */
|
||
case endline:
|
||
DEBUG_PRINT1 ("EXECUTING endline.\n");
|
||
|
||
if (AT_STRINGS_END (d))
|
||
{
|
||
if (!bufp->not_eol) break;
|
||
}
|
||
|
||
/* We have to ``prefetch'' the next character. */
|
||
else if ((d == end1 ? *string2 : *d) == '\n'
|
||
&& bufp->newline_anchor)
|
||
{
|
||
break;
|
||
}
|
||
goto fail;
|
||
|
||
|
||
/* Match at the very beginning of the data. */
|
||
case begbuf:
|
||
DEBUG_PRINT1 ("EXECUTING begbuf.\n");
|
||
if (AT_STRINGS_BEG (d))
|
||
break;
|
||
goto fail;
|
||
|
||
|
||
/* Match at the very end of the data. */
|
||
case endbuf:
|
||
DEBUG_PRINT1 ("EXECUTING endbuf.\n");
|
||
if (AT_STRINGS_END (d))
|
||
break;
|
||
goto fail;
|
||
|
||
|
||
/* on_failure_keep_string_jump is used to optimize `.*\n'. It
|
||
pushes NULL as the value for the string on the stack. Then
|
||
`pop_failure_point' will keep the current value for the
|
||
string, instead of restoring it. To see why, consider
|
||
matching `foo\nbar' against `.*\n'. The .* matches the foo;
|
||
then the . fails against the \n. But the next thing we want
|
||
to do is match the \n against the \n; if we restored the
|
||
string value, we would be back at the foo.
|
||
|
||
Because this is used only in specific cases, we don't need to
|
||
check all the things that `on_failure_jump' does, to make
|
||
sure the right things get saved on the stack. Hence we don't
|
||
share its code. The only reason to push anything on the
|
||
stack at all is that otherwise we would have to change
|
||
`anychar's code to do something besides goto fail in this
|
||
case; that seems worse than this. */
|
||
case on_failure_keep_string_jump:
|
||
DEBUG_PRINT1 ("EXECUTING on_failure_keep_string_jump");
|
||
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p);
|
||
DEBUG_PRINT3 (" %d (to 0x%x):\n", mcnt, p + mcnt);
|
||
|
||
PUSH_FAILURE_POINT (p + mcnt, NULL, -2);
|
||
break;
|
||
|
||
|
||
/* Uses of on_failure_jump:
|
||
|
||
Each alternative starts with an on_failure_jump that points
|
||
to the beginning of the next alternative. Each alternative
|
||
except the last ends with a jump that in effect jumps past
|
||
the rest of the alternatives. (They really jump to the
|
||
ending jump of the following alternative, because tensioning
|
||
these jumps is a hassle.)
|
||
|
||
Repeats start with an on_failure_jump that points past both
|
||
the repetition text and either the following jump or
|
||
pop_failure_jump back to this on_failure_jump. */
|
||
case on_failure_jump:
|
||
on_failure:
|
||
DEBUG_PRINT1 ("EXECUTING on_failure_jump");
|
||
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p);
|
||
DEBUG_PRINT3 (" %d (to 0x%x)", mcnt, p + mcnt);
|
||
|
||
/* If this on_failure_jump comes right before a group (i.e.,
|
||
the original * applied to a group), save the information
|
||
for that group and all inner ones, so that if we fail back
|
||
to this point, the group's information will be correct.
|
||
For example, in \(a*\)*\1, we need the preceding group,
|
||
and in \(\(a*\)b*\)\2, we need the inner group. */
|
||
|
||
/* We can't use `p' to check ahead because we push
|
||
a failure point to `p + mcnt' after we do this. */
|
||
p1 = p;
|
||
|
||
/* We need to skip no_op's before we look for the
|
||
start_memory in case this on_failure_jump is happening as
|
||
the result of a completed succeed_n, as in \(a\)\{1,3\}b\1
|
||
against aba. */
|
||
while (p1 < pend && (re_opcode_t) *p1 == no_op)
|
||
p1++;
|
||
|
||
if (p1 < pend && (re_opcode_t) *p1 == start_memory)
|
||
{
|
||
/* We have a new highest active register now. This will
|
||
get reset at the start_memory we are about to get to,
|
||
but we will have saved all the registers relevant to
|
||
this repetition op, as described above. */
|
||
highest_active_reg = *(p1 + 1) + *(p1 + 2);
|
||
if (lowest_active_reg == NO_LOWEST_ACTIVE_REG)
|
||
lowest_active_reg = *(p1 + 1);
|
||
}
|
||
|
||
DEBUG_PRINT1 (":\n");
|
||
PUSH_FAILURE_POINT (p + mcnt, d, -2);
|
||
break;
|
||
|
||
|
||
/* A smart repeat ends with `maybe_pop_jump'.
|
||
We change it to either `pop_failure_jump' or `jump'. */
|
||
case maybe_pop_jump:
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p);
|
||
DEBUG_PRINT2 ("EXECUTING maybe_pop_jump %d.\n", mcnt);
|
||
{
|
||
register unsigned char *p2 = p;
|
||
|
||
/* Compare the beginning of the repeat with what in the
|
||
pattern follows its end. If we can establish that there
|
||
is nothing that they would both match, i.e., that we
|
||
would have to backtrack because of (as in, e.g., `a*a')
|
||
then we can change to pop_failure_jump, because we'll
|
||
never have to backtrack.
|
||
|
||
This is not true in the case of alternatives: in
|
||
`(a|ab)*' we do need to backtrack to the `ab' alternative
|
||
(e.g., if the string was `ab'). But instead of trying to
|
||
detect that here, the alternative has put on a dummy
|
||
failure point which is what we will end up popping. */
|
||
|
||
/* Skip over open/close-group commands. */
|
||
while (p2 + 2 < pend
|
||
&& ((re_opcode_t) *p2 == stop_memory
|
||
|| (re_opcode_t) *p2 == start_memory))
|
||
p2 += 3; /* Skip over args, too. */
|
||
|
||
/* If we're at the end of the pattern, we can change. */
|
||
if (p2 == pend)
|
||
{
|
||
/* Consider what happens when matching ":\(.*\)"
|
||
against ":/". I don't really understand this code
|
||
yet. */
|
||
p[-3] = (unsigned char) pop_failure_jump;
|
||
DEBUG_PRINT1
|
||
(" End of pattern: change to `pop_failure_jump'.\n");
|
||
}
|
||
|
||
else if ((re_opcode_t) *p2 == exactn
|
||
|| (bufp->newline_anchor && (re_opcode_t) *p2 == endline))
|
||
{
|
||
register unsigned char c
|
||
= *p2 == (unsigned char) endline ? '\n' : p2[2];
|
||
p1 = p + mcnt;
|
||
|
||
/* p1[0] ... p1[2] are the `on_failure_jump' corresponding
|
||
to the `maybe_finalize_jump' of this case. Examine what
|
||
follows. */
|
||
if ((re_opcode_t) p1[3] == exactn && p1[5] != c)
|
||
{
|
||
p[-3] = (unsigned char) pop_failure_jump;
|
||
DEBUG_PRINT3 (" %c != %c => pop_failure_jump.\n",
|
||
c, p1[5]);
|
||
}
|
||
|
||
else if ((re_opcode_t) p1[3] == charset
|
||
|| (re_opcode_t) p1[3] == charset_not)
|
||
{
|
||
int not = (re_opcode_t) p1[3] == charset_not;
|
||
|
||
if (c < (unsigned char) (p1[4] * BYTEWIDTH)
|
||
&& p1[5 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH)))
|
||
not = !not;
|
||
|
||
/* `not' is equal to 1 if c would match, which means
|
||
that we can't change to pop_failure_jump. */
|
||
if (!not)
|
||
{
|
||
p[-3] = (unsigned char) pop_failure_jump;
|
||
DEBUG_PRINT1 (" No match => pop_failure_jump.\n");
|
||
}
|
||
}
|
||
}
|
||
}
|
||
p -= 2; /* Point at relative address again. */
|
||
if ((re_opcode_t) p[-1] != pop_failure_jump)
|
||
{
|
||
p[-1] = (unsigned char) jump;
|
||
DEBUG_PRINT1 (" Match => jump.\n");
|
||
goto unconditional_jump;
|
||
}
|
||
/* Note fall through. */
|
||
|
||
|
||
/* The end of a simple repeat has a pop_failure_jump back to
|
||
its matching on_failure_jump, where the latter will push a
|
||
failure point. The pop_failure_jump takes off failure
|
||
points put on by this pop_failure_jump's matching
|
||
on_failure_jump; we got through the pattern to here from the
|
||
matching on_failure_jump, so didn't fail. */
|
||
case pop_failure_jump:
|
||
{
|
||
/* We need to pass separate storage for the lowest and
|
||
highest registers, even though we don't care about the
|
||
actual values. Otherwise, we will restore only one
|
||
register from the stack, since lowest will == highest in
|
||
`pop_failure_point'. */
|
||
unsigned dummy_low_reg, dummy_high_reg;
|
||
unsigned char *pdummy;
|
||
const char *sdummy;
|
||
|
||
DEBUG_PRINT1 ("EXECUTING pop_failure_jump.\n");
|
||
POP_FAILURE_POINT (sdummy, pdummy,
|
||
dummy_low_reg, dummy_high_reg,
|
||
reg_dummy, reg_dummy, reg_info_dummy);
|
||
}
|
||
/* Note fall through. */
|
||
|
||
|
||
/* Unconditionally jump (without popping any failure points). */
|
||
case jump:
|
||
unconditional_jump:
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p); /* Get the amount to jump. */
|
||
DEBUG_PRINT2 ("EXECUTING jump %d ", mcnt);
|
||
p += mcnt; /* Do the jump. */
|
||
DEBUG_PRINT2 ("(to 0x%x).\n", p);
|
||
break;
|
||
|
||
|
||
/* We need this opcode so we can detect where alternatives end
|
||
in `group_match_null_string_p' et al. */
|
||
case jump_past_alt:
|
||
DEBUG_PRINT1 ("EXECUTING jump_past_alt.\n");
|
||
goto unconditional_jump;
|
||
|
||
|
||
/* Normally, the on_failure_jump pushes a failure point, which
|
||
then gets popped at pop_failure_jump. We will end up at
|
||
pop_failure_jump, also, and with a pattern of, say, `a+', we
|
||
are skipping over the on_failure_jump, so we have to push
|
||
something meaningless for pop_failure_jump to pop. */
|
||
case dummy_failure_jump:
|
||
DEBUG_PRINT1 ("EXECUTING dummy_failure_jump.\n");
|
||
/* It doesn't matter what we push for the string here. What
|
||
the code at `fail' tests is the value for the pattern. */
|
||
PUSH_FAILURE_POINT (0, 0, -2);
|
||
goto unconditional_jump;
|
||
|
||
|
||
/* At the end of an alternative, we need to push a dummy failure
|
||
point in case we are followed by a `pop_failure_jump', because
|
||
we don't want the failure point for the alternative to be
|
||
popped. For example, matching `(a|ab)*' against `aab'
|
||
requires that we match the `ab' alternative. */
|
||
case push_dummy_failure:
|
||
DEBUG_PRINT1 ("EXECUTING push_dummy_failure.\n");
|
||
/* See comments just above at `dummy_failure_jump' about the
|
||
two zeroes. */
|
||
PUSH_FAILURE_POINT (0, 0, -2);
|
||
break;
|
||
|
||
/* Have to succeed matching what follows at least n times.
|
||
After that, handle like `on_failure_jump'. */
|
||
case succeed_n:
|
||
EXTRACT_NUMBER (mcnt, p + 2);
|
||
DEBUG_PRINT2 ("EXECUTING succeed_n %d.\n", mcnt);
|
||
|
||
assert (mcnt >= 0);
|
||
/* Originally, this is how many times we HAVE to succeed. */
|
||
if (mcnt > 0)
|
||
{
|
||
mcnt--;
|
||
p += 2;
|
||
STORE_NUMBER_AND_INCR (p, mcnt);
|
||
DEBUG_PRINT3 (" Setting 0x%x to %d.\n", p, mcnt);
|
||
}
|
||
else if (mcnt == 0)
|
||
{
|
||
DEBUG_PRINT2 (" Setting two bytes from 0x%x to no_op.\n", p+2);
|
||
p[2] = (unsigned char) no_op;
|
||
p[3] = (unsigned char) no_op;
|
||
goto on_failure;
|
||
}
|
||
break;
|
||
|
||
case jump_n:
|
||
EXTRACT_NUMBER (mcnt, p + 2);
|
||
DEBUG_PRINT2 ("EXECUTING jump_n %d.\n", mcnt);
|
||
|
||
/* Originally, this is how many times we CAN jump. */
|
||
if (mcnt)
|
||
{
|
||
mcnt--;
|
||
STORE_NUMBER (p + 2, mcnt);
|
||
goto unconditional_jump;
|
||
}
|
||
/* If don't have to jump any more, skip over the rest of command. */
|
||
else
|
||
p += 4;
|
||
break;
|
||
|
||
case set_number_at:
|
||
{
|
||
DEBUG_PRINT1 ("EXECUTING set_number_at.\n");
|
||
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p);
|
||
p1 = p + mcnt;
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p);
|
||
DEBUG_PRINT3 (" Setting 0x%x to %d.\n", p1, mcnt);
|
||
STORE_NUMBER (p1, mcnt);
|
||
break;
|
||
}
|
||
|
||
case wordbound:
|
||
DEBUG_PRINT1 ("EXECUTING wordbound.\n");
|
||
if (AT_WORD_BOUNDARY (d))
|
||
break;
|
||
goto fail;
|
||
|
||
case notwordbound:
|
||
DEBUG_PRINT1 ("EXECUTING notwordbound.\n");
|
||
if (AT_WORD_BOUNDARY (d))
|
||
goto fail;
|
||
break;
|
||
|
||
case wordbeg:
|
||
DEBUG_PRINT1 ("EXECUTING wordbeg.\n");
|
||
if (WORDCHAR_P (d) && (AT_STRINGS_BEG (d) || !WORDCHAR_P (d - 1)))
|
||
break;
|
||
goto fail;
|
||
|
||
case wordend:
|
||
DEBUG_PRINT1 ("EXECUTING wordend.\n");
|
||
if (!AT_STRINGS_BEG (d) && WORDCHAR_P (d - 1)
|
||
&& (!WORDCHAR_P (d) || AT_STRINGS_END (d)))
|
||
break;
|
||
goto fail;
|
||
|
||
#ifdef emacs
|
||
#ifdef emacs19
|
||
case before_dot:
|
||
DEBUG_PRINT1 ("EXECUTING before_dot.\n");
|
||
if (PTR_CHAR_POS ((unsigned char *) d) >= point)
|
||
goto fail;
|
||
break;
|
||
|
||
case at_dot:
|
||
DEBUG_PRINT1 ("EXECUTING at_dot.\n");
|
||
if (PTR_CHAR_POS ((unsigned char *) d) != point)
|
||
goto fail;
|
||
break;
|
||
|
||
case after_dot:
|
||
DEBUG_PRINT1 ("EXECUTING after_dot.\n");
|
||
if (PTR_CHAR_POS ((unsigned char *) d) <= point)
|
||
goto fail;
|
||
break;
|
||
#else /* not emacs19 */
|
||
case at_dot:
|
||
DEBUG_PRINT1 ("EXECUTING at_dot.\n");
|
||
if (PTR_CHAR_POS ((unsigned char *) d) + 1 != point)
|
||
goto fail;
|
||
break;
|
||
#endif /* not emacs19 */
|
||
|
||
case syntaxspec:
|
||
DEBUG_PRINT2 ("EXECUTING syntaxspec %d.\n", mcnt);
|
||
mcnt = *p++;
|
||
goto matchsyntax;
|
||
|
||
case wordchar:
|
||
DEBUG_PRINT1 ("EXECUTING Emacs wordchar.\n");
|
||
mcnt = (int) Sword;
|
||
matchsyntax:
|
||
PREFETCH ();
|
||
if (SYNTAX (*d++) != (enum syntaxcode) mcnt)
|
||
goto fail;
|
||
SET_REGS_MATCHED ();
|
||
break;
|
||
|
||
case notsyntaxspec:
|
||
DEBUG_PRINT2 ("EXECUTING notsyntaxspec %d.\n", mcnt);
|
||
mcnt = *p++;
|
||
goto matchnotsyntax;
|
||
|
||
case notwordchar:
|
||
DEBUG_PRINT1 ("EXECUTING Emacs notwordchar.\n");
|
||
mcnt = (int) Sword;
|
||
matchnotsyntax:
|
||
PREFETCH ();
|
||
if (SYNTAX (*d++) == (enum syntaxcode) mcnt)
|
||
goto fail;
|
||
SET_REGS_MATCHED ();
|
||
break;
|
||
|
||
#else /* not emacs */
|
||
case wordchar:
|
||
DEBUG_PRINT1 ("EXECUTING non-Emacs wordchar.\n");
|
||
PREFETCH ();
|
||
if (!WORDCHAR_P (d))
|
||
goto fail;
|
||
SET_REGS_MATCHED ();
|
||
d++;
|
||
break;
|
||
|
||
case notwordchar:
|
||
DEBUG_PRINT1 ("EXECUTING non-Emacs notwordchar.\n");
|
||
PREFETCH ();
|
||
if (WORDCHAR_P (d))
|
||
goto fail;
|
||
SET_REGS_MATCHED ();
|
||
d++;
|
||
break;
|
||
#endif /* not emacs */
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
continue; /* Successfully executed one pattern command; keep going. */
|
||
|
||
|
||
/* We goto here if a matching operation fails. */
|
||
fail:
|
||
if (!FAIL_STACK_EMPTY ())
|
||
{ /* A restart point is known. Restore to that state. */
|
||
DEBUG_PRINT1 ("\nFAIL:\n");
|
||
POP_FAILURE_POINT (d, p,
|
||
lowest_active_reg, highest_active_reg,
|
||
regstart, regend, reg_info);
|
||
|
||
/* If this failure point is a dummy, try the next one. */
|
||
if (!p)
|
||
goto fail;
|
||
|
||
/* If we failed to the end of the pattern, don't examine *p. */
|
||
assert (p <= pend);
|
||
if (p < pend)
|
||
{
|
||
boolean is_a_jump_n = false;
|
||
|
||
/* If failed to a backwards jump that's part of a repetition
|
||
loop, need to pop this failure point and use the next one. */
|
||
switch ((re_opcode_t) *p)
|
||
{
|
||
case jump_n:
|
||
is_a_jump_n = true;
|
||
case maybe_pop_jump:
|
||
case pop_failure_jump:
|
||
case jump:
|
||
p1 = p + 1;
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
p1 += mcnt;
|
||
|
||
if ((is_a_jump_n && (re_opcode_t) *p1 == succeed_n)
|
||
|| (!is_a_jump_n
|
||
&& (re_opcode_t) *p1 == on_failure_jump))
|
||
goto fail;
|
||
break;
|
||
default:
|
||
/* do nothing */ ;
|
||
}
|
||
}
|
||
|
||
if (d >= string1 && d <= end1)
|
||
dend = end_match_1;
|
||
}
|
||
else
|
||
break; /* Matching at this starting point really fails. */
|
||
} /* for (;;) */
|
||
|
||
if (best_regs_set)
|
||
goto restore_best_regs;
|
||
|
||
FREE_VARIABLES ();
|
||
|
||
return -1; /* Failure to match. */
|
||
} /* re_match_2 */
|
||
|
||
/* Subroutine definitions for re_match_2. */
|
||
|
||
|
||
/* We are passed P pointing to a register number after a start_memory.
|
||
|
||
Return true if the pattern up to the corresponding stop_memory can
|
||
match the empty string, and false otherwise.
|
||
|
||
If we find the matching stop_memory, sets P to point to one past its number.
|
||
Otherwise, sets P to an undefined byte less than or equal to END.
|
||
|
||
We don't handle duplicates properly (yet). */
|
||
|
||
static boolean
|
||
group_match_null_string_p (p, end, reg_info)
|
||
unsigned char **p, *end;
|
||
register_info_type *reg_info;
|
||
{
|
||
int mcnt;
|
||
/* Point to after the args to the start_memory. */
|
||
unsigned char *p1 = *p + 2;
|
||
|
||
while (p1 < end)
|
||
{
|
||
/* Skip over opcodes that can match nothing, and return true or
|
||
false, as appropriate, when we get to one that can't, or to the
|
||
matching stop_memory. */
|
||
|
||
switch ((re_opcode_t) *p1)
|
||
{
|
||
/* Could be either a loop or a series of alternatives. */
|
||
case on_failure_jump:
|
||
p1++;
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
|
||
/* If the next operation is not a jump backwards in the
|
||
pattern. */
|
||
|
||
if (mcnt >= 0)
|
||
{
|
||
/* Go through the on_failure_jumps of the alternatives,
|
||
seeing if any of the alternatives cannot match nothing.
|
||
The last alternative starts with only a jump,
|
||
whereas the rest start with on_failure_jump and end
|
||
with a jump, e.g., here is the pattern for `a|b|c':
|
||
|
||
/on_failure_jump/0/6/exactn/1/a/jump_past_alt/0/6
|
||
/on_failure_jump/0/6/exactn/1/b/jump_past_alt/0/3
|
||
/exactn/1/c
|
||
|
||
So, we have to first go through the first (n-1)
|
||
alternatives and then deal with the last one separately. */
|
||
|
||
|
||
/* Deal with the first (n-1) alternatives, which start
|
||
with an on_failure_jump (see above) that jumps to right
|
||
past a jump_past_alt. */
|
||
|
||
while ((re_opcode_t) p1[mcnt-3] == jump_past_alt)
|
||
{
|
||
/* `mcnt' holds how many bytes long the alternative
|
||
is, including the ending `jump_past_alt' and
|
||
its number. */
|
||
|
||
if (!alt_match_null_string_p (p1, p1 + mcnt - 3,
|
||
reg_info))
|
||
return false;
|
||
|
||
/* Move to right after this alternative, including the
|
||
jump_past_alt. */
|
||
p1 += mcnt;
|
||
|
||
/* Break if it's the beginning of an n-th alternative
|
||
that doesn't begin with an on_failure_jump. */
|
||
if ((re_opcode_t) *p1 != on_failure_jump)
|
||
break;
|
||
|
||
/* Still have to check that it's not an n-th
|
||
alternative that starts with an on_failure_jump. */
|
||
p1++;
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
if ((re_opcode_t) p1[mcnt-3] != jump_past_alt)
|
||
{
|
||
/* Get to the beginning of the n-th alternative. */
|
||
p1 -= 3;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Deal with the last alternative: go back and get number
|
||
of the `jump_past_alt' just before it. `mcnt' contains
|
||
the length of the alternative. */
|
||
EXTRACT_NUMBER (mcnt, p1 - 2);
|
||
|
||
if (!alt_match_null_string_p (p1, p1 + mcnt, reg_info))
|
||
return false;
|
||
|
||
p1 += mcnt; /* Get past the n-th alternative. */
|
||
} /* if mcnt > 0 */
|
||
break;
|
||
|
||
|
||
case stop_memory:
|
||
assert (p1[1] == **p);
|
||
*p = p1 + 2;
|
||
return true;
|
||
|
||
|
||
default:
|
||
if (!common_op_match_null_string_p (&p1, end, reg_info))
|
||
return false;
|
||
}
|
||
} /* while p1 < end */
|
||
|
||
return false;
|
||
} /* group_match_null_string_p */
|
||
|
||
|
||
/* Similar to group_match_null_string_p, but doesn't deal with alternatives:
|
||
It expects P to be the first byte of a single alternative and END one
|
||
byte past the last. The alternative can contain groups. */
|
||
|
||
static boolean
|
||
alt_match_null_string_p (p, end, reg_info)
|
||
unsigned char *p, *end;
|
||
register_info_type *reg_info;
|
||
{
|
||
int mcnt;
|
||
unsigned char *p1 = p;
|
||
|
||
while (p1 < end)
|
||
{
|
||
/* Skip over opcodes that can match nothing, and break when we get
|
||
to one that can't. */
|
||
|
||
switch ((re_opcode_t) *p1)
|
||
{
|
||
/* It's a loop. */
|
||
case on_failure_jump:
|
||
p1++;
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
p1 += mcnt;
|
||
break;
|
||
|
||
default:
|
||
if (!common_op_match_null_string_p (&p1, end, reg_info))
|
||
return false;
|
||
}
|
||
} /* while p1 < end */
|
||
|
||
return true;
|
||
} /* alt_match_null_string_p */
|
||
|
||
|
||
/* Deals with the ops common to group_match_null_string_p and
|
||
alt_match_null_string_p.
|
||
|
||
Sets P to one after the op and its arguments, if any. */
|
||
|
||
static boolean
|
||
common_op_match_null_string_p (p, end, reg_info)
|
||
unsigned char **p, *end;
|
||
register_info_type *reg_info;
|
||
{
|
||
int mcnt;
|
||
boolean ret;
|
||
int reg_no;
|
||
unsigned char *p1 = *p;
|
||
|
||
switch ((re_opcode_t) *p1++)
|
||
{
|
||
case no_op:
|
||
case begline:
|
||
case endline:
|
||
case begbuf:
|
||
case endbuf:
|
||
case wordbeg:
|
||
case wordend:
|
||
case wordbound:
|
||
case notwordbound:
|
||
#ifdef emacs
|
||
case before_dot:
|
||
case at_dot:
|
||
case after_dot:
|
||
#endif
|
||
break;
|
||
|
||
case start_memory:
|
||
reg_no = *p1;
|
||
assert (reg_no > 0 && reg_no <= MAX_REGNUM);
|
||
ret = group_match_null_string_p (&p1, end, reg_info);
|
||
|
||
/* Have to set this here in case we're checking a group which
|
||
contains a group and a back reference to it. */
|
||
|
||
if (REG_MATCH_NULL_STRING_P (reg_info[reg_no]) == MATCH_NULL_UNSET_VALUE)
|
||
REG_MATCH_NULL_STRING_P (reg_info[reg_no]) = ret;
|
||
|
||
if (!ret)
|
||
return false;
|
||
break;
|
||
|
||
/* If this is an optimized succeed_n for zero times, make the jump. */
|
||
case jump:
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
if (mcnt >= 0)
|
||
p1 += mcnt;
|
||
else
|
||
return false;
|
||
break;
|
||
|
||
case succeed_n:
|
||
/* Get to the number of times to succeed. */
|
||
p1 += 2;
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
|
||
if (mcnt == 0)
|
||
{
|
||
p1 -= 4;
|
||
EXTRACT_NUMBER_AND_INCR (mcnt, p1);
|
||
p1 += mcnt;
|
||
}
|
||
else
|
||
return false;
|
||
break;
|
||
|
||
case duplicate:
|
||
if (!REG_MATCH_NULL_STRING_P (reg_info[*p1]))
|
||
return false;
|
||
break;
|
||
|
||
case set_number_at:
|
||
p1 += 4;
|
||
|
||
default:
|
||
/* All other opcodes mean we cannot match the empty string. */
|
||
return false;
|
||
}
|
||
|
||
*p = p1;
|
||
return true;
|
||
} /* common_op_match_null_string_p */
|
||
|
||
|
||
/* Return zero if TRANSLATE[S1] and TRANSLATE[S2] are identical for LEN
|
||
bytes; nonzero otherwise. */
|
||
|
||
static int
|
||
bcmp_translate(
|
||
unsigned char *s1,
|
||
unsigned char *s2,
|
||
int len,
|
||
char *translate
|
||
)
|
||
{
|
||
register unsigned char *p1 = s1, *p2 = s2;
|
||
while (len)
|
||
{
|
||
if (translate[*p1++] != translate[*p2++]) return 1;
|
||
len--;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Entry points for GNU code. */
|
||
|
||
/* re_compile_pattern is the GNU regular expression compiler: it
|
||
compiles PATTERN (of length SIZE) and puts the result in BUFP.
|
||
Returns 0 if the pattern was valid, otherwise an error string.
|
||
|
||
Assumes the `allocated' (and perhaps `buffer') and `translate' fields
|
||
are set in BUFP on entry.
|
||
|
||
We call regex_compile to do the actual compilation. */
|
||
|
||
const char *
|
||
re_compile_pattern (pattern, length, bufp)
|
||
const char *pattern;
|
||
int length;
|
||
struct re_pattern_buffer *bufp;
|
||
{
|
||
reg_errcode_t ret;
|
||
|
||
/* GNU code is written to assume at least RE_NREGS registers will be set
|
||
(and at least one extra will be -1). */
|
||
bufp->regs_allocated = REGS_UNALLOCATED;
|
||
|
||
/* And GNU code determines whether or not to get register information
|
||
by passing null for the REGS argument to re_match, etc., not by
|
||
setting no_sub. */
|
||
bufp->no_sub = 0;
|
||
|
||
/* Match anchors at newline. */
|
||
bufp->newline_anchor = 1;
|
||
|
||
ret = regex_compile (pattern, length, re_syntax_options, bufp);
|
||
|
||
return re_error_msg[(int) ret];
|
||
}
|
||
|
||
/* Entry points compatible with 4.2 BSD regex library. We don't define
|
||
them if this is an Emacs or POSIX compilation. */
|
||
|
||
#if !defined (emacs) && !defined (_POSIX_SOURCE)
|
||
|
||
/* BSD has one and only one pattern buffer. */
|
||
static struct re_pattern_buffer re_comp_buf;
|
||
|
||
char *
|
||
re_comp (s)
|
||
const char *s;
|
||
{
|
||
reg_errcode_t ret;
|
||
|
||
if (!s)
|
||
{
|
||
if (!re_comp_buf.buffer)
|
||
return "No previous regular expression";
|
||
return 0;
|
||
}
|
||
|
||
if (!re_comp_buf.buffer)
|
||
{
|
||
re_comp_buf.buffer = (unsigned char *) malloc (200);
|
||
if (re_comp_buf.buffer == NULL)
|
||
return "Memory exhausted";
|
||
re_comp_buf.allocated = 200;
|
||
|
||
re_comp_buf.fastmap = (char *) malloc (1 << BYTEWIDTH);
|
||
if (re_comp_buf.fastmap == NULL)
|
||
return "Memory exhausted";
|
||
}
|
||
|
||
/* Since `re_exec' always passes NULL for the `regs' argument, we
|
||
don't need to initialize the pattern buffer fields which affect it. */
|
||
|
||
/* Match anchors at newlines. */
|
||
re_comp_buf.newline_anchor = 1;
|
||
|
||
ret = regex_compile (s, strlen (s), re_syntax_options, &re_comp_buf);
|
||
|
||
/* Yes, we're discarding `const' here. */
|
||
return (char *) re_error_msg[(int) ret];
|
||
}
|
||
|
||
|
||
int
|
||
re_exec (s)
|
||
const char *s;
|
||
{
|
||
const int len = strlen (s);
|
||
return
|
||
0 <= re_search (&re_comp_buf, s, len, 0, len, (struct re_registers *) 0);
|
||
}
|
||
#endif /* not emacs and not _POSIX_SOURCE */
|
||
|
||
/* POSIX.2 functions. Don't define these for Emacs. */
|
||
|
||
#ifndef emacs
|
||
|
||
/* regcomp takes a regular expression as a string and compiles it.
|
||
|
||
PREG is a regex_t *. We do not expect any fields to be initialized,
|
||
since POSIX says we shouldn't. Thus, we set
|
||
|
||
`buffer' to the compiled pattern;
|
||
`used' to the length of the compiled pattern;
|
||
`syntax' to RE_SYNTAX_POSIX_EXTENDED if the
|
||
REG_EXTENDED bit in CFLAGS is set; otherwise, to
|
||
RE_SYNTAX_POSIX_BASIC;
|
||
`newline_anchor' to REG_NEWLINE being set in CFLAGS;
|
||
`fastmap' and `fastmap_accurate' to zero;
|
||
`re_nsub' to the number of subexpressions in PATTERN.
|
||
|
||
PATTERN is the address of the pattern string.
|
||
|
||
CFLAGS is a series of bits which affect compilation.
|
||
|
||
If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we
|
||
use POSIX basic syntax.
|
||
|
||
If REG_NEWLINE is set, then . and [^...] don't match newline.
|
||
Also, regexec will try a match beginning after every newline.
|
||
|
||
If REG_ICASE is set, then we considers upper- and lowercase
|
||
versions of letters to be equivalent when matching.
|
||
|
||
If REG_NOSUB is set, then when PREG is passed to regexec, that
|
||
routine will report only success or failure, and nothing about the
|
||
registers.
|
||
|
||
It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for
|
||
the return codes and their meanings.) */
|
||
|
||
int
|
||
regcomp (preg, pattern, cflags)
|
||
regex_t *preg;
|
||
const char *pattern;
|
||
int cflags;
|
||
{
|
||
reg_errcode_t ret;
|
||
unsigned syntax
|
||
= (cflags & REG_EXTENDED) ?
|
||
RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC;
|
||
|
||
/* regex_compile will allocate the space for the compiled pattern. */
|
||
preg->buffer = 0;
|
||
preg->allocated = 0;
|
||
|
||
/* Don't bother to use a fastmap when searching. This simplifies the
|
||
REG_NEWLINE case: if we used a fastmap, we'd have to put all the
|
||
characters after newlines into the fastmap. This way, we just try
|
||
every character. */
|
||
preg->fastmap = 0;
|
||
|
||
if (cflags & REG_ICASE)
|
||
{
|
||
unsigned i;
|
||
|
||
preg->translate = (char *) malloc (CHAR_SET_SIZE);
|
||
if (preg->translate == NULL)
|
||
return (int) REG_ESPACE;
|
||
|
||
/* Map uppercase characters to corresponding lowercase ones. */
|
||
for (i = 0; i < CHAR_SET_SIZE; i++)
|
||
preg->translate[i] = ISUPPER (i) ? tolower (i) : i;
|
||
}
|
||
else
|
||
preg->translate = NULL;
|
||
|
||
/* If REG_NEWLINE is set, newlines are treated differently. */
|
||
if (cflags & REG_NEWLINE)
|
||
{ /* REG_NEWLINE implies neither . nor [^...] match newline. */
|
||
syntax &= ~RE_DOT_NEWLINE;
|
||
syntax |= RE_HAT_LISTS_NOT_NEWLINE;
|
||
/* It also changes the matching behavior. */
|
||
preg->newline_anchor = 1;
|
||
}
|
||
else
|
||
preg->newline_anchor = 0;
|
||
|
||
preg->no_sub = !!(cflags & REG_NOSUB);
|
||
|
||
/* POSIX says a null character in the pattern terminates it, so we
|
||
can use strlen here in compiling the pattern. */
|
||
ret = regex_compile (pattern, strlen (pattern), syntax, preg);
|
||
|
||
/* POSIX doesn't distinguish between an unmatched open-group and an
|
||
unmatched close-group: both are REG_EPAREN. */
|
||
if (ret == REG_ERPAREN) ret = REG_EPAREN;
|
||
|
||
return (int) ret;
|
||
}
|
||
|
||
|
||
/* regexec searches for a given pattern, specified by PREG, in the
|
||
string STRING.
|
||
|
||
If NMATCH is zero or REG_NOSUB was set in the cflags argument to
|
||
`regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at
|
||
least NMATCH elements, and we set them to the offsets of the
|
||
corresponding matched substrings.
|
||
|
||
EFLAGS specifies `execution flags' which affect matching: if
|
||
REG_NOTBOL is set, then ^ does not match at the beginning of the
|
||
string; if REG_NOTEOL is set, then $ does not match at the end.
|
||
|
||
We return 0 if we find a match and REG_NOMATCH if not. */
|
||
|
||
int
|
||
regexec (preg, string, nmatch, pmatch, eflags)
|
||
const regex_t *preg;
|
||
const char *string;
|
||
size_t nmatch;
|
||
regmatch_t pmatch[];
|
||
int eflags;
|
||
{
|
||
int ret;
|
||
struct re_registers regs;
|
||
regex_t private_preg;
|
||
int len = strlen (string);
|
||
boolean want_reg_info = !preg->no_sub && nmatch > 0;
|
||
|
||
private_preg = *preg;
|
||
|
||
private_preg.not_bol = !!(eflags & REG_NOTBOL);
|
||
private_preg.not_eol = !!(eflags & REG_NOTEOL);
|
||
|
||
/* The user has told us exactly how many registers to return
|
||
information about, via `nmatch'. We have to pass that on to the
|
||
matching routines. */
|
||
private_preg.regs_allocated = REGS_FIXED;
|
||
|
||
if (want_reg_info)
|
||
{
|
||
regs.num_regs = nmatch;
|
||
regs.start = TALLOC (nmatch, regoff_t);
|
||
regs.end = TALLOC (nmatch, regoff_t);
|
||
if (regs.start == NULL || regs.end == NULL)
|
||
return (int) REG_NOMATCH;
|
||
}
|
||
|
||
/* Perform the searching operation. */
|
||
ret = re_search (&private_preg, string, len,
|
||
/* start: */ 0, /* range: */ len,
|
||
want_reg_info ? ®s : (struct re_registers *) 0);
|
||
|
||
/* Copy the register information to the POSIX structure. */
|
||
if (want_reg_info)
|
||
{
|
||
if (ret >= 0)
|
||
{
|
||
unsigned r;
|
||
|
||
for (r = 0; r < nmatch; r++)
|
||
{
|
||
pmatch[r].rm_so = regs.start[r];
|
||
pmatch[r].rm_eo = regs.end[r];
|
||
}
|
||
}
|
||
|
||
/* If we needed the temporary register info, free the space now. */
|
||
free (regs.start);
|
||
free (regs.end);
|
||
}
|
||
|
||
/* We want zero return to mean success, unlike `re_search'. */
|
||
return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH;
|
||
}
|
||
|
||
|
||
/* Returns a message corresponding to an error code, ERRCODE, returned
|
||
from either regcomp or regexec. We don't use PREG here. */
|
||
|
||
size_t
|
||
regerror (errcode, preg, errbuf, errbuf_size)
|
||
int errcode;
|
||
const regex_t *preg;
|
||
char *errbuf;
|
||
size_t errbuf_size;
|
||
{
|
||
const char *msg;
|
||
size_t msg_size;
|
||
|
||
if (errcode < 0
|
||
|| errcode >= (sizeof (re_error_msg) / sizeof (re_error_msg[0])))
|
||
/* Only error codes returned by the rest of the code should be passed
|
||
to this routine. If we are given anything else, or if other regex
|
||
code generates an invalid error code, then the program has a bug.
|
||
Dump core so we can fix it. */
|
||
abort ();
|
||
|
||
msg = re_error_msg[errcode];
|
||
|
||
/* POSIX doesn't require that we do anything in this case, but why
|
||
not be nice. */
|
||
if (! msg)
|
||
msg = "Success";
|
||
|
||
msg_size = strlen (msg) + 1; /* Includes the null. */
|
||
|
||
if (errbuf_size != 0)
|
||
{
|
||
if (msg_size > errbuf_size)
|
||
{
|
||
strncpy (errbuf, msg, errbuf_size - 1);
|
||
errbuf[errbuf_size - 1] = 0;
|
||
}
|
||
else
|
||
strcpy (errbuf, msg);
|
||
}
|
||
|
||
return msg_size;
|
||
}
|
||
|
||
|
||
/* Free dynamically allocated space used by PREG. */
|
||
|
||
void
|
||
regfree (preg)
|
||
regex_t *preg;
|
||
{
|
||
if (preg->buffer != NULL)
|
||
free (preg->buffer);
|
||
preg->buffer = NULL;
|
||
|
||
preg->allocated = 0;
|
||
preg->used = 0;
|
||
|
||
if (preg->fastmap != NULL)
|
||
free (preg->fastmap);
|
||
preg->fastmap = NULL;
|
||
preg->fastmap_accurate = 0;
|
||
|
||
if (preg->translate != NULL)
|
||
free (preg->translate);
|
||
preg->translate = NULL;
|
||
}
|
||
|
||
#endif /* not emacs */
|
||
|
||
/*
|
||
Local variables:
|
||
make-backup-files: t
|
||
version-control: t
|
||
trim-versions-without-asking: nil
|
||
End:
|
||
*/
|