зеркало из https://github.com/github/ruby.git
808 строки
19 KiB
C
808 строки
19 KiB
C
/**********************************************************************
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sprintf.c -
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$Author$
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$Date$
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created at: Fri Oct 15 10:39:26 JST 1993
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Copyright (C) 1993-2003 Yukihiro Matsumoto
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Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
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Copyright (C) 2000 Information-technology Promotion Agency, Japan
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**********************************************************************/
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#include "ruby.h"
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#include <ctype.h>
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#include <math.h>
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#define BIT_DIGITS(N) (((N)*146)/485 + 1) /* log2(10) =~ 146/485 */
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static void fmt_setup _((char*,int,int,int,int));
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static char*
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remove_sign_bits(str, base)
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char *str;
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int base;
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{
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char *s, *t;
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s = t = str;
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if (base == 16) {
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while (*t == 'f') {
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t++;
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}
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}
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else if (base == 8) {
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if (*t == '3') t++;
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while (*t == '7') {
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t++;
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}
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}
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else if (base == 2) {
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while (*t == '1') {
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t++;
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}
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}
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if (t > s) {
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while (*t) *s++ = *t++;
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*s = '\0';
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}
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return str;
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}
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static char
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sign_bits(base, p)
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int base;
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const char *p;
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{
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char c = '.';
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switch (base) {
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case 16:
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if (*p == 'X') c = 'F';
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else c = 'f';
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break;
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case 8:
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c = '7'; break;
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case 2:
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c = '1'; break;
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}
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return c;
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}
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#define FNONE 0
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#define FSHARP 1
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#define FMINUS 2
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#define FPLUS 4
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#define FZERO 8
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#define FSPACE 16
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#define FWIDTH 32
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#define FPREC 64
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#define CHECK(l) do {\
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while (blen + (l) >= bsiz) {\
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bsiz*=2;\
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}\
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rb_str_resize(result, bsiz);\
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buf = RSTRING(result)->ptr;\
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} while (0)
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#define PUSH(s, l) do { \
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CHECK(l);\
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memcpy(&buf[blen], s, l);\
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blen += (l);\
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} while (0)
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#define GETARG() (nextvalue != Qundef ? nextvalue : \
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posarg < 0 ? \
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(rb_raise(rb_eArgError, "unnumbered(%d) mixed with numbered", nextarg), 0) : \
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(posarg = nextarg++, GETNTHARG(posarg)))
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#define GETPOSARG(n) (posarg > 0 ? \
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(rb_raise(rb_eArgError, "numbered(%d) after unnumbered(%d)", n, posarg), 0) : \
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((n < 1) ? (rb_raise(rb_eArgError, "invalid index - %d$", n), 0) : \
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(posarg = -1, GETNTHARG(n))))
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#define GETNTHARG(nth) \
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((nth >= argc) ? (rb_raise(rb_eArgError, "too few arguments."), 0) : argv[nth])
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#define GETASTER(val) do { \
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t = p++; \
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n = 0; \
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for (; p < end && ISDIGIT(*p); p++) { \
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n = 10 * n + (*p - '0'); \
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} \
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if (p >= end) { \
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rb_raise(rb_eArgError, "malformed format string - %%*[0-9]"); \
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} \
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if (*p == '$') { \
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tmp = GETPOSARG(n); \
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} \
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else { \
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tmp = GETARG(); \
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p = t; \
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} \
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val = NUM2INT(tmp); \
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} while (0)
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/*
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* call-seq:
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* format(format_string [, arguments...] ) => string
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* sprintf(format_string [, arguments...] ) => string
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*
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* Returns the string resulting from applying <i>format_string</i> to
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* any additional arguments. Within the format string, any characters
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* other than format sequences are copied to the result. A format
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* sequence consists of a percent sign, followed by optional flags,
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* width, and precision indicators, then terminated with a field type
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* character. The field type controls how the corresponding
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* <code>sprintf</code> argument is to be interpreted, while the flags
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* modify that interpretation. The field type characters are listed
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* in the table at the end of this section. The flag characters are:
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*
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* Flag | Applies to | Meaning
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* ---------+--------------+-----------------------------------------
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* space | bdeEfgGioxXu | Leave a space at the start of
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* | | positive numbers.
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* ---------+--------------+-----------------------------------------
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* (digit)$ | all | Specifies the absolute argument number
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* | | for this field. Absolute and relative
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* | | argument numbers cannot be mixed in a
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* | | sprintf string.
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* ---------+--------------+-----------------------------------------
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* # | beEfgGoxX | Use an alternative format. For the
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* | | conversions `o', `x', `X', and `b',
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* | | prefix the result with ``0'', ``0x'', ``0X'',
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* | | and ``0b'', respectively. For `e',
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* | | `E', `f', `g', and 'G', force a decimal
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* | | point to be added, even if no digits follow.
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* | | For `g' and 'G', do not remove trailing zeros.
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* ---------+--------------+-----------------------------------------
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* + | bdeEfgGioxXu | Add a leading plus sign to positive numbers.
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* ---------+--------------+-----------------------------------------
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* - | all | Left-justify the result of this conversion.
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* ---------+--------------+-----------------------------------------
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* 0 (zero) | all | Pad with zeros, not spaces.
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* ---------+--------------+-----------------------------------------
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* * | all | Use the next argument as the field width.
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* | | If negative, left-justify the result. If the
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* | | asterisk is followed by a number and a dollar
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* | | sign, use the indicated argument as the width.
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*
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*
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* The field width is an optional integer, followed optionally by a
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* period and a precision. The width specifies the minimum number of
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* characters that will be written to the result for this field. For
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* numeric fields, the precision controls the number of decimal places
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* displayed. For string fields, the precision determines the maximum
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* number of characters to be copied from the string. (Thus, the format
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* sequence <code>%10.10s</code> will always contribute exactly ten
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* characters to the result.)
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*
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* The field types are:
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*
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* Field | Conversion
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* ------+--------------------------------------------------------------
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* b | Convert argument as a binary number.
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* c | Argument is the numeric code for a single character.
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* d | Convert argument as a decimal number.
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* E | Equivalent to `e', but uses an uppercase E to indicate
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* | the exponent.
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* e | Convert floating point argument into exponential notation
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* | with one digit before the decimal point. The precision
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* | determines the number of fractional digits (defaulting to six).
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* f | Convert floating point argument as [-]ddd.ddd,
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* | where the precision determines the number of digits after
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* | the decimal point.
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* G | Equivalent to `g', but use an uppercase `E' in exponent form.
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* g | Convert a floating point number using exponential form
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* | if the exponent is less than -4 or greater than or
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* | equal to the precision, or in d.dddd form otherwise.
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* i | Identical to `d'.
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* o | Convert argument as an octal number.
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* p | The valuing of argument.inspect.
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* s | Argument is a string to be substituted. If the format
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* | sequence contains a precision, at most that many characters
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* | will be copied.
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* u | Treat argument as an unsigned decimal number.
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* X | Convert argument as a hexadecimal number using uppercase
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* | letters. Negative numbers will be displayed with two
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* | leading periods (representing an infinite string of
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* | leading 'FF's.
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* x | Convert argument as a hexadecimal number.
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* | Negative numbers will be displayed with two
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* | leading periods (representing an infinite string of
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* | leading 'ff's.
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*
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* Examples:
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*
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* sprintf("%d %04x", 123, 123) #=> "123 007b"
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* sprintf("%08b '%4s'", 123, 123) #=> "01111011 ' 123'"
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* sprintf("%1$*2$s %2$d %1$s", "hello", 8) #=> " hello 8 hello"
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* sprintf("%1$*2$s %2$d", "hello", -8) #=> "hello -8"
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* sprintf("%+g:% g:%-g", 1.23, 1.23, 1.23) #=> "+1.23: 1.23:1.23"
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*/
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VALUE
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rb_f_sprintf(argc, argv)
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int argc;
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VALUE *argv;
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{
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VALUE fmt;
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const char *p, *end;
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char *buf;
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int blen, bsiz;
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VALUE result;
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int width, prec, flags = FNONE;
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int nextarg = 1;
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int posarg = 0;
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int tainted = 0;
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VALUE nextvalue;
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VALUE tmp;
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VALUE str;
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fmt = GETNTHARG(0);
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if (OBJ_TAINTED(fmt)) tainted = 1;
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StringValue(fmt);
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fmt = rb_str_new4(fmt);
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p = RSTRING(fmt)->ptr;
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end = p + RSTRING(fmt)->len;
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blen = 0;
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bsiz = 120;
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result = rb_str_buf_new(bsiz);
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buf = RSTRING(result)->ptr;
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for (; p < end; p++) {
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const char *t;
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int n;
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for (t = p; t < end && *t != '%'; t++) ;
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PUSH(p, t - p);
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if (t >= end) {
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/* end of fmt string */
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goto sprint_exit;
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}
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p = t + 1; /* skip `%' */
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width = prec = -1;
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nextvalue = Qundef;
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retry:
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switch (*p) {
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default:
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if (ISPRINT(*p))
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rb_raise(rb_eArgError, "malformed format string - %%%c", *p);
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else
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rb_raise(rb_eArgError, "malformed format string");
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break;
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case ' ':
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flags |= FSPACE;
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p++;
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goto retry;
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case '#':
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flags |= FSHARP;
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p++;
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goto retry;
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case '+':
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flags |= FPLUS;
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p++;
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goto retry;
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case '-':
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flags |= FMINUS;
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p++;
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goto retry;
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case '0':
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flags |= FZERO;
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p++;
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goto retry;
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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n = 0;
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for (; p < end && ISDIGIT(*p); p++) {
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n = 10 * n + (*p - '0');
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}
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if (p >= end) {
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rb_raise(rb_eArgError, "malformed format string - %%[0-9]");
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}
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if (*p == '$') {
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if (nextvalue != Qundef) {
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rb_raise(rb_eArgError, "value given twice - %d$", n);
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}
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nextvalue = GETPOSARG(n);
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p++;
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goto retry;
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}
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width = n;
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flags |= FWIDTH;
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goto retry;
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case '*':
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if (flags & FWIDTH) {
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rb_raise(rb_eArgError, "width given twice");
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}
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flags |= FWIDTH;
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GETASTER(width);
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if (width < 0) {
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flags |= FMINUS;
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width = -width;
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}
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p++;
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goto retry;
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case '.':
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if (flags & FPREC) {
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rb_raise(rb_eArgError, "precision given twice");
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}
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flags |= FPREC;
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prec = 0;
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p++;
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if (*p == '*') {
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GETASTER(prec);
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if (prec < 0) { /* ignore negative precision */
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flags &= ~FPREC;
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}
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p++;
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goto retry;
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}
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for (; p < end && ISDIGIT(*p); p++) {
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prec = 10 * prec + (*p - '0');
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}
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if (p >= end) {
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rb_raise(rb_eArgError, "malformed format string - %%.[0-9]");
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}
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goto retry;
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case '\n':
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p--;
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case '\0':
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case '%':
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if (flags != FNONE) {
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rb_raise(rb_eArgError, "illegal format character - %%");
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}
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PUSH("%", 1);
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break;
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case 'c':
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{
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VALUE val = GETARG();
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char c;
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if (!(flags & FMINUS))
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while (--width > 0)
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PUSH(" ", 1);
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c = NUM2INT(val) & 0xff;
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PUSH(&c, 1);
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while (--width > 0)
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PUSH(" ", 1);
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}
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break;
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case 's':
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case 'p':
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{
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VALUE arg = GETARG();
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long len;
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if (*p == 'p') arg = rb_inspect(arg);
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str = rb_obj_as_string(arg);
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if (OBJ_TAINTED(str)) tainted = 1;
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len = RSTRING(str)->len;
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if (flags&FPREC) {
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if (prec < len) {
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len = prec;
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}
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}
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if (flags&FWIDTH) {
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if (width > len) {
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CHECK(width);
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width -= len;
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if (!(flags&FMINUS)) {
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while (width--) {
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buf[blen++] = ' ';
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}
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}
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memcpy(&buf[blen], RSTRING(str)->ptr, len);
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blen += len;
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if (flags&FMINUS) {
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while (width--) {
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buf[blen++] = ' ';
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}
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}
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break;
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}
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}
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PUSH(RSTRING(str)->ptr, len);
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}
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break;
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case 'd':
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case 'i':
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case 'o':
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case 'x':
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case 'X':
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case 'b':
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case 'B':
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case 'u':
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{
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volatile VALUE val = GETARG();
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char fbuf[32], nbuf[64], *s, *t;
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char *prefix = 0;
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int sign = 0;
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char sc = 0;
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long v = 0;
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int base, bignum = 0;
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int len, pos;
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switch (*p) {
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case 'd':
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case 'i':
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sign = 1; break;
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case 'o':
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case 'x':
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case 'X':
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case 'b':
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case 'B':
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case 'u':
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default:
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if (flags&(FPLUS|FSPACE)) sign = 1;
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break;
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}
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if (flags & FSHARP) {
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switch (*p) {
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case 'o':
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prefix = "0"; break;
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case 'x':
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prefix = "0x"; break;
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case 'X':
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prefix = "0X"; break;
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case 'b':
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prefix = "0b"; break;
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case 'B':
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prefix = "0B"; break;
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}
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if (prefix) {
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width -= strlen(prefix);
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}
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}
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bin_retry:
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switch (TYPE(val)) {
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case T_FLOAT:
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val = rb_dbl2big(RFLOAT(val)->value);
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if (FIXNUM_P(val)) goto bin_retry;
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bignum = 1;
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break;
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case T_STRING:
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val = rb_str_to_inum(val, 0, Qtrue);
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goto bin_retry;
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case T_BIGNUM:
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bignum = 1;
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break;
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case T_FIXNUM:
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v = FIX2LONG(val);
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break;
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default:
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val = rb_Integer(val);
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goto bin_retry;
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}
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switch (*p) {
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case 'o':
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base = 8; break;
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case 'x':
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case 'X':
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base = 16; break;
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case 'b':
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case 'B':
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base = 2; break;
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case 'u':
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case 'd':
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case 'i':
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default:
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base = 10; break;
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}
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if (!bignum) {
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if (base == 2) {
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val = rb_int2big(v);
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goto bin_retry;
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}
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if (sign) {
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char c = *p;
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if (c == 'i') c = 'd'; /* %d and %i are identical */
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if (v < 0) {
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v = -v;
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sc = '-';
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width--;
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}
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else if (flags & FPLUS) {
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sc = '+';
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width--;
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}
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else if (flags & FSPACE) {
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sc = ' ';
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width--;
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}
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sprintf(fbuf, "%%l%c", c);
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sprintf(nbuf, fbuf, v);
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}
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else {
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s = nbuf;
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if (v < 0) {
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if (base == 10) {
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rb_warning("negative number for %%u specifier");
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}
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|
else if (!(flags&(FPREC|FZERO))) {
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strcpy(s, "..");
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s += 2;
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}
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}
|
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sprintf(fbuf, "%%l%c", *p == 'X' ? 'x' : *p);
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|
sprintf(s, fbuf, v);
|
|
if (v < 0) {
|
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char d = 0;
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|
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remove_sign_bits(s, base);
|
|
switch (base) {
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|
case 16:
|
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d = 'f'; break;
|
|
case 8:
|
|
d = '7'; break;
|
|
}
|
|
if (d && *s != d) {
|
|
memmove(s+1, s, strlen(s)+1);
|
|
*s = d;
|
|
}
|
|
}
|
|
}
|
|
s = nbuf;
|
|
}
|
|
else {
|
|
if (sign) {
|
|
tmp = rb_big2str(val, base);
|
|
s = RSTRING(tmp)->ptr;
|
|
if (s[0] == '-') {
|
|
s++;
|
|
sc = '-';
|
|
width--;
|
|
}
|
|
else if (flags & FPLUS) {
|
|
sc = '+';
|
|
width--;
|
|
}
|
|
else if (flags & FSPACE) {
|
|
sc = ' ';
|
|
width--;
|
|
}
|
|
}
|
|
else {
|
|
if (!RBIGNUM(val)->sign) {
|
|
val = rb_big_clone(val);
|
|
rb_big_2comp(val);
|
|
}
|
|
tmp = rb_big2str(val, base);
|
|
s = RSTRING(tmp)->ptr;
|
|
if (*s == '-') {
|
|
if (base == 10) {
|
|
rb_warning("negative number for %%u specifier");
|
|
}
|
|
else {
|
|
remove_sign_bits(++s, base);
|
|
tmp = rb_str_new(0, 3+strlen(s));
|
|
t = RSTRING(tmp)->ptr;
|
|
if (!(flags&(FPREC|FZERO))) {
|
|
strcpy(t, "..");
|
|
t += 2;
|
|
}
|
|
switch (base) {
|
|
case 16:
|
|
if (s[0] != 'f') strcpy(t++, "f"); break;
|
|
case 8:
|
|
if (s[0] != '7') strcpy(t++, "7"); break;
|
|
case 2:
|
|
if (s[0] != '1') strcpy(t++, "1"); break;
|
|
}
|
|
strcpy(t, s);
|
|
s = RSTRING(tmp)->ptr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pos = -1;
|
|
len = strlen(s);
|
|
|
|
if (*p == 'X') {
|
|
char *pp = s;
|
|
while (*pp) {
|
|
*pp = toupper(*pp);
|
|
pp++;
|
|
}
|
|
}
|
|
if ((flags&(FZERO|FPREC)) == FZERO) {
|
|
prec = width;
|
|
width = 0;
|
|
}
|
|
else {
|
|
if (prec < len) prec = len;
|
|
width -= prec;
|
|
}
|
|
if (!(flags&FMINUS)) {
|
|
CHECK(width);
|
|
while (width-- > 0) {
|
|
buf[blen++] = ' ';
|
|
}
|
|
}
|
|
if (sc) PUSH(&sc, 1);
|
|
if (prefix) {
|
|
int plen = strlen(prefix);
|
|
PUSH(prefix, plen);
|
|
}
|
|
CHECK(prec - len);
|
|
if (!bignum && v < 0) {
|
|
char c = sign_bits(base, p);
|
|
while (len < prec--) {
|
|
buf[blen++] = c;
|
|
}
|
|
}
|
|
else {
|
|
char c;
|
|
|
|
if (!sign && bignum && !RBIGNUM(val)->sign)
|
|
c = sign_bits(base, p);
|
|
else
|
|
c = '0';
|
|
while (len < prec--) {
|
|
buf[blen++] = c;
|
|
}
|
|
}
|
|
PUSH(s, len);
|
|
CHECK(width);
|
|
while (width-- > 0) {
|
|
buf[blen++] = ' ';
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 'f':
|
|
case 'g':
|
|
case 'G':
|
|
case 'e':
|
|
case 'E':
|
|
{
|
|
VALUE val = GETARG();
|
|
double fval;
|
|
int i, need = 6;
|
|
char fbuf[32];
|
|
|
|
fval = RFLOAT(rb_Float(val))->value;
|
|
if (isnan(fval) || isinf(fval)) {
|
|
char *expr;
|
|
|
|
if (isnan(fval)) {
|
|
expr = "NaN";
|
|
}
|
|
else {
|
|
expr = "Inf";
|
|
}
|
|
need = strlen(expr);
|
|
if ((!isnan(fval) && fval < 0.0) || (flags & FPLUS))
|
|
need++;
|
|
if ((flags & FWIDTH) && need < width)
|
|
need = width;
|
|
|
|
CHECK(need);
|
|
sprintf(&buf[blen], "%*s", need, "");
|
|
if (flags & FMINUS) {
|
|
if (!isnan(fval) && fval < 0.0)
|
|
buf[blen++] = '-';
|
|
else if (flags & FPLUS)
|
|
buf[blen++] = '+';
|
|
else if (flags & FSPACE)
|
|
blen++;
|
|
strncpy(&buf[blen], expr, strlen(expr));
|
|
}
|
|
else if (flags & FZERO) {
|
|
if (!isnan(fval) && fval < 0.0) {
|
|
buf[blen++] = '-';
|
|
need--;
|
|
}
|
|
else if (flags & FPLUS) {
|
|
buf[blen++] = '+';
|
|
need--;
|
|
}
|
|
else if (flags & FSPACE) {
|
|
blen++;
|
|
need--;
|
|
}
|
|
while (need-- - strlen(expr) > 0) {
|
|
buf[blen++] = '0';
|
|
}
|
|
strncpy(&buf[blen], expr, strlen(expr));
|
|
}
|
|
else {
|
|
if (!isnan(fval) && fval < 0.0)
|
|
buf[blen + need - strlen(expr) - 1] = '-';
|
|
else if (flags & FPLUS)
|
|
buf[blen + need - strlen(expr) - 1] = '+';
|
|
strncpy(&buf[blen + need - strlen(expr)], expr,
|
|
strlen(expr));
|
|
}
|
|
blen += strlen(&buf[blen]);
|
|
break;
|
|
}
|
|
|
|
fmt_setup(fbuf, *p, flags, width, prec);
|
|
need = 0;
|
|
if (*p != 'e' && *p != 'E') {
|
|
i = INT_MIN;
|
|
frexp(fval, &i);
|
|
if (i > 0)
|
|
need = BIT_DIGITS(i);
|
|
}
|
|
need += (flags&FPREC) ? prec : 6;
|
|
if ((flags&FWIDTH) && need < width)
|
|
need = width;
|
|
need += 20;
|
|
|
|
CHECK(need);
|
|
sprintf(&buf[blen], fbuf, fval);
|
|
blen += strlen(&buf[blen]);
|
|
}
|
|
break;
|
|
}
|
|
flags = FNONE;
|
|
}
|
|
|
|
sprint_exit:
|
|
/* XXX - We cannot validiate the number of arguments if (digit)$ style used.
|
|
*/
|
|
if (RTEST(ruby_verbose) && posarg >= 0 && nextarg < argc) {
|
|
rb_raise(rb_eArgError, "too many arguments for format string");
|
|
}
|
|
rb_str_resize(result, blen);
|
|
|
|
if (tainted) OBJ_TAINT(result);
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
fmt_setup(buf, c, flags, width, prec)
|
|
char *buf;
|
|
int c;
|
|
int flags, width, prec;
|
|
{
|
|
*buf++ = '%';
|
|
if (flags & FSHARP) *buf++ = '#';
|
|
if (flags & FPLUS) *buf++ = '+';
|
|
if (flags & FMINUS) *buf++ = '-';
|
|
if (flags & FZERO) *buf++ = '0';
|
|
if (flags & FSPACE) *buf++ = ' ';
|
|
|
|
if (flags & FWIDTH) {
|
|
sprintf(buf, "%d", width);
|
|
buf += strlen(buf);
|
|
}
|
|
|
|
if (flags & FPREC) {
|
|
sprintf(buf, ".%d", prec);
|
|
buf += strlen(buf);
|
|
}
|
|
|
|
*buf++ = c;
|
|
*buf = '\0';
|
|
}
|