зеркало из https://github.com/github/putty.git
464 строки
16 KiB
C
464 строки
16 KiB
C
/*
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* winutils.c: miscellaneous Windows utilities
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "misc.h"
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#ifdef TESTMODE
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/* Definitions to allow this module to be compiled standalone for testing. */
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#define smalloc malloc
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#define srealloc realloc
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#define sfree free
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#endif
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/*
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* Split a complete command line into argc/argv, attempting to do
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* it exactly the same way Windows itself would do it (so that
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* console utilities, which receive argc and argv from Windows,
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* will have their command lines processed in the same way as GUI
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* utilities which get a whole command line and must break it
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* themselves).
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*
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* Does not modify the input command line.
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*
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* The final parameter (argstart) is used to return a second array
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* of char * pointers, the same length as argv, each one pointing
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* at the start of the corresponding element of argv in the
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* original command line. So if you get half way through processing
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* your command line in argc/argv form and then decide you want to
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* treat the rest as a raw string, you can. If you don't want to,
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* `argstart' can be safely left NULL.
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*/
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void split_into_argv(char *cmdline, int *argc, char ***argv,
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char ***argstart)
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{
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char *p;
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char *outputline, *q;
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char **outputargv, **outputargstart;
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int outputargc;
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/*
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* At first glance the rules appeared to be:
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*
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* - Single quotes are not special characters.
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*
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* - Double quotes are removed, but within them spaces cease
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* to be special.
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*
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* - Backslashes are _only_ special when a sequence of them
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* appear just before a double quote. In this situation,
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* they are treated like C backslashes: so \" just gives a
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* literal quote, \\" gives a literal backslash and then
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* opens or closes a double-quoted segment, \\\" gives a
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* literal backslash and then a literal quote, \\\\" gives
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* two literal backslashes and then opens/closes a
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* double-quoted segment, and so forth. Note that this
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* behaviour is identical inside and outside double quotes.
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*
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* - Two successive double quotes become one literal double
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* quote, but only _inside_ a double-quoted segment.
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* Outside, they just form an empty double-quoted segment
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* (which may cause an empty argument word).
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*
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* - That only leaves the interesting question of what happens
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* when one or more backslashes precedes two or more double
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* quotes, starting inside a double-quoted string. And the
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* answer to that appears somewhat bizarre. Here I tabulate
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* number of backslashes (across the top) against number of
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* quotes (down the left), and indicate how many backslashes
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* are output, how many quotes are output, and whether a
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* quoted segment is open at the end of the sequence:
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*
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* backslashes
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*
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* 0 1 2 3 4
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*
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* 0 0,0,y | 1,0,y 2,0,y 3,0,y 4,0,y
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* --------+-----------------------------
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* 1 0,0,n | 0,1,y 1,0,n 1,1,y 2,0,n
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* q 2 0,1,n | 0,1,n 1,1,n 1,1,n 2,1,n
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* u 3 0,1,y | 0,2,n 1,1,y 1,2,n 2,1,y
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* o 4 0,1,n | 0,2,y 1,1,n 1,2,y 2,1,n
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* t 5 0,2,n | 0,2,n 1,2,n 1,2,n 2,2,n
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* e 6 0,2,y | 0,3,n 1,2,y 1,3,n 2,2,y
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* s 7 0,2,n | 0,3,y 1,2,n 1,3,y 2,2,n
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* 8 0,3,n | 0,3,n 1,3,n 1,3,n 2,3,n
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* 9 0,3,y | 0,4,n 1,3,y 1,4,n 2,3,y
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* 10 0,3,n | 0,4,y 1,3,n 1,4,y 2,3,n
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* 11 0,4,n | 0,4,n 1,4,n 1,4,n 2,4,n
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*
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*
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* [Test fragment was of the form "a\\\"""b c" d.]
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*
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* There is very weird mod-3 behaviour going on here in the
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* number of quotes, and it even applies when there aren't any
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* backslashes! How ghastly.
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*
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* With a bit of thought, this extremely odd diagram suddenly
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* coalesced itself into a coherent, if still ghastly, model of
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* how things work:
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*
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* - As before, backslashes are only special when one or more
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* of them appear contiguously before at least one double
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* quote. In this situation the backslashes do exactly what
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* you'd expect: each one quotes the next thing in front of
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* it, so you end up with n/2 literal backslashes (if n is
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* even) or (n-1)/2 literal backslashes and a literal quote
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* (if n is odd). In the latter case the double quote
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* character right after the backslashes is used up.
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*
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* - After that, any remaining double quotes are processed. A
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* string of contiguous unescaped double quotes has a mod-3
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* behaviour:
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*
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* * inside a quoted segment, a quote ends the segment.
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* * _immediately_ after ending a quoted segment, a quote
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* simply produces a literal quote.
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* * otherwise, outside a quoted segment, a quote begins a
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* quoted segment.
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*
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* So, for example, if we started inside a quoted segment
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* then two contiguous quotes would close the segment and
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* produce a literal quote; three would close the segment,
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* produce a literal quote, and open a new segment. If we
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* started outside a quoted segment, then two contiguous
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* quotes would open and then close a segment, producing no
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* output (but potentially creating a zero-length argument);
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* but three quotes would open and close a segment and then
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* produce a literal quote.
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*/
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/*
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* First deal with the simplest of all special cases: if there
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* aren't any arguments, return 0,NULL,NULL.
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*/
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while (*cmdline && isspace(*cmdline)) cmdline++;
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if (!*cmdline) {
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if (argc) *argc = 0;
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if (argv) *argv = NULL;
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if (argstart) *argstart = NULL;
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return;
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}
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/*
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* This will guaranteeably be big enough; we can realloc it
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* down later.
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*/
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outputline = snewn(1+strlen(cmdline), char);
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outputargv = snewn(strlen(cmdline)+1 / 2, char *);
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outputargstart = snewn(strlen(cmdline)+1 / 2, char *);
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p = cmdline; q = outputline; outputargc = 0;
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while (*p) {
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int quote;
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/* Skip whitespace searching for start of argument. */
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while (*p && isspace(*p)) p++;
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if (!*p) break;
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/* We have an argument; start it. */
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outputargv[outputargc] = q;
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outputargstart[outputargc] = p;
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outputargc++;
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quote = 0;
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/* Copy data into the argument until it's finished. */
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while (*p) {
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if (!quote && isspace(*p))
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break; /* argument is finished */
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if (*p == '"' || *p == '\\') {
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/*
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* We have a sequence of zero or more backslashes
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* followed by a sequence of zero or more quotes.
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* Count up how many of each, and then deal with
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* them as appropriate.
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*/
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int i, slashes = 0, quotes = 0;
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while (*p == '\\') slashes++, p++;
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while (*p == '"') quotes++, p++;
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if (!quotes) {
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/*
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* Special case: if there are no quotes,
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* slashes are not special at all, so just copy
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* n slashes to the output string.
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*/
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while (slashes--) *q++ = '\\';
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} else {
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/* Slashes annihilate in pairs. */
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while (slashes >= 2) slashes -= 2, *q++ = '\\';
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/* One remaining slash takes out the first quote. */
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if (slashes) quotes--, *q++ = '"';
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if (quotes > 0) {
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/* Outside a quote segment, a quote starts one. */
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if (!quote) quotes--, quote = 1;
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/* Now we produce (n+1)/3 literal quotes... */
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for (i = 3; i <= quotes+1; i += 3) *q++ = '"';
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/* ... and end in a quote segment iff 3 divides n. */
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quote = (quotes % 3 == 0);
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}
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}
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} else {
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*q++ = *p++;
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}
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}
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/* At the end of an argument, just append a trailing NUL. */
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*q++ = '\0';
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}
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outputargv = sresize(outputargv, outputargc, char *);
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outputargstart = sresize(outputargstart, outputargc, char *);
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if (argc) *argc = outputargc;
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if (argv) *argv = outputargv; else sfree(outputargv);
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if (argstart) *argstart = outputargstart; else sfree(outputargstart);
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}
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#ifdef TESTMODE
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const struct argv_test {
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const char *cmdline;
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const char *argv[10];
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} argv_tests[] = {
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/*
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* We generate this set of tests by invoking ourself with
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* `-generate'.
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*/
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{"ab c\" d", {"ab", "c d", NULL}},
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{"a\"b c\" d", {"ab c", "d", NULL}},
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{"a\"\"b c\" d", {"ab", "c d", NULL}},
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{"a\"\"\"b c\" d", {"a\"b", "c d", NULL}},
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{"a\"\"\"\"b c\" d", {"a\"b c", "d", NULL}},
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{"a\"\"\"\"\"b c\" d", {"a\"b", "c d", NULL}},
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{"a\"\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"a\"\"\"\"\"\"\"b c\" d", {"a\"\"b c", "d", NULL}},
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{"a\"\"\"\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"a\\b c\" d", {"a\\b", "c d", NULL}},
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{"a\\\"b c\" d", {"a\"b", "c d", NULL}},
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{"a\\\"\"b c\" d", {"a\"b c", "d", NULL}},
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{"a\\\"\"\"b c\" d", {"a\"b", "c d", NULL}},
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{"a\\\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"a\\\"\"\"\"\"b c\" d", {"a\"\"b c", "d", NULL}},
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{"a\\\"\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"a\\\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b", "c d", NULL}},
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{"a\\\"\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b c", "d", NULL}},
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{"a\\\\b c\" d", {"a\\\\b", "c d", NULL}},
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{"a\\\\\"b c\" d", {"a\\b c", "d", NULL}},
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{"a\\\\\"\"b c\" d", {"a\\b", "c d", NULL}},
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{"a\\\\\"\"\"b c\" d", {"a\\\"b", "c d", NULL}},
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{"a\\\\\"\"\"\"b c\" d", {"a\\\"b c", "d", NULL}},
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{"a\\\\\"\"\"\"\"b c\" d", {"a\\\"b", "c d", NULL}},
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{"a\\\\\"\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"a\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\"\"b c", "d", NULL}},
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{"a\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"a\\\\\\b c\" d", {"a\\\\\\b", "c d", NULL}},
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{"a\\\\\\\"b c\" d", {"a\\\"b", "c d", NULL}},
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{"a\\\\\\\"\"b c\" d", {"a\\\"b c", "d", NULL}},
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{"a\\\\\\\"\"\"b c\" d", {"a\\\"b", "c d", NULL}},
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{"a\\\\\\\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"a\\\\\\\"\"\"\"\"b c\" d", {"a\\\"\"b c", "d", NULL}},
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{"a\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"a\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b", "c d", NULL}},
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{"a\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b c", "d", NULL}},
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{"a\\\\\\\\b c\" d", {"a\\\\\\\\b", "c d", NULL}},
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{"a\\\\\\\\\"b c\" d", {"a\\\\b c", "d", NULL}},
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{"a\\\\\\\\\"\"b c\" d", {"a\\\\b", "c d", NULL}},
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{"a\\\\\\\\\"\"\"b c\" d", {"a\\\\\"b", "c d", NULL}},
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{"a\\\\\\\\\"\"\"\"b c\" d", {"a\\\\\"b c", "d", NULL}},
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{"a\\\\\\\\\"\"\"\"\"b c\" d", {"a\\\\\"b", "c d", NULL}},
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{"a\\\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b", "c d", NULL}},
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{"a\\\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b c", "d", NULL}},
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{"a\\\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b", "c d", NULL}},
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{"\"ab c\" d", {"ab c", "d", NULL}},
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{"\"a\"b c\" d", {"ab", "c d", NULL}},
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{"\"a\"\"b c\" d", {"a\"b", "c d", NULL}},
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{"\"a\"\"\"b c\" d", {"a\"b c", "d", NULL}},
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{"\"a\"\"\"\"b c\" d", {"a\"b", "c d", NULL}},
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{"\"a\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"\"a\"\"\"\"\"\"b c\" d", {"a\"\"b c", "d", NULL}},
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{"\"a\"\"\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"\"a\"\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b", "c d", NULL}},
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{"\"a\\b c\" d", {"a\\b c", "d", NULL}},
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{"\"a\\\"b c\" d", {"a\"b c", "d", NULL}},
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{"\"a\\\"\"b c\" d", {"a\"b", "c d", NULL}},
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{"\"a\\\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"\"a\\\"\"\"\"b c\" d", {"a\"\"b c", "d", NULL}},
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{"\"a\\\"\"\"\"\"b c\" d", {"a\"\"b", "c d", NULL}},
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{"\"a\\\"\"\"\"\"\"b c\" d", {"a\"\"\"b", "c d", NULL}},
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{"\"a\\\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b c", "d", NULL}},
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{"\"a\\\"\"\"\"\"\"\"\"b c\" d", {"a\"\"\"b", "c d", NULL}},
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{"\"a\\\\b c\" d", {"a\\\\b c", "d", NULL}},
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{"\"a\\\\\"b c\" d", {"a\\b", "c d", NULL}},
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{"\"a\\\\\"\"b c\" d", {"a\\\"b", "c d", NULL}},
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{"\"a\\\\\"\"\"b c\" d", {"a\\\"b c", "d", NULL}},
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{"\"a\\\\\"\"\"\"b c\" d", {"a\\\"b", "c d", NULL}},
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{"\"a\\\\\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"\"a\\\\\"\"\"\"\"\"b c\" d", {"a\\\"\"b c", "d", NULL}},
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{"\"a\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"\"a\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b", "c d", NULL}},
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{"\"a\\\\\\b c\" d", {"a\\\\\\b c", "d", NULL}},
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{"\"a\\\\\\\"b c\" d", {"a\\\"b c", "d", NULL}},
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{"\"a\\\\\\\"\"b c\" d", {"a\\\"b", "c d", NULL}},
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{"\"a\\\\\\\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"\"a\\\\\\\"\"\"\"b c\" d", {"a\\\"\"b c", "d", NULL}},
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{"\"a\\\\\\\"\"\"\"\"b c\" d", {"a\\\"\"b", "c d", NULL}},
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{"\"a\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b", "c d", NULL}},
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{"\"a\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b c", "d", NULL}},
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{"\"a\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\"\"\"b", "c d", NULL}},
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{"\"a\\\\\\\\b c\" d", {"a\\\\\\\\b c", "d", NULL}},
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{"\"a\\\\\\\\\"b c\" d", {"a\\\\b", "c d", NULL}},
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{"\"a\\\\\\\\\"\"b c\" d", {"a\\\\\"b", "c d", NULL}},
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{"\"a\\\\\\\\\"\"\"b c\" d", {"a\\\\\"b c", "d", NULL}},
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{"\"a\\\\\\\\\"\"\"\"b c\" d", {"a\\\\\"b", "c d", NULL}},
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{"\"a\\\\\\\\\"\"\"\"\"b c\" d", {"a\\\\\"\"b", "c d", NULL}},
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{"\"a\\\\\\\\\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b c", "d", NULL}},
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{"\"a\\\\\\\\\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"b", "c d", NULL}},
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{"\"a\\\\\\\\\"\"\"\"\"\"\"\"b c\" d", {"a\\\\\"\"\"b", "c d", NULL}},
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};
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int main(int argc, char **argv)
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{
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int i, j;
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if (argc > 1) {
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/*
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* Generation of tests.
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*
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* Given `-splat <args>', we print out a C-style
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* representation of each argument (in the form "a", "b",
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* NULL), backslash-escaping each backslash and double
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* quote.
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*
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* Given `-split <string>', we first doctor `string' by
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* turning forward slashes into backslashes, single quotes
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* into double quotes and underscores into spaces; and then
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* we feed the resulting string to ourself with `-splat'.
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*
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* Given `-generate', we concoct a variety of fun test
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* cases, encode them in quote-safe form (mapping \, " and
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* space to /, ' and _ respectively) and feed each one to
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* `-split'.
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*/
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if (!strcmp(argv[1], "-splat")) {
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int i;
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char *p;
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for (i = 2; i < argc; i++) {
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putchar('"');
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for (p = argv[i]; *p; p++) {
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if (*p == '\\' || *p == '"')
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putchar('\\');
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putchar(*p);
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}
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printf("\", ");
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}
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printf("NULL");
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return 0;
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}
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if (!strcmp(argv[1], "-split") && argc > 2) {
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char *str = malloc(20 + strlen(argv[0]) + strlen(argv[2]));
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char *p, *q;
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q = str + sprintf(str, "%s -splat ", argv[0]);
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printf(" {\"");
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for (p = argv[2]; *p; p++, q++) {
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switch (*p) {
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case '/': printf("\\\\"); *q = '\\'; break;
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case '\'': printf("\\\""); *q = '"'; break;
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case '_': printf(" "); *q = ' '; break;
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default: putchar(*p); *q = *p; break;
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}
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}
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*p = '\0';
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printf("\", {");
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fflush(stdout);
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system(str);
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printf("}},\n");
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return 0;
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}
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if (!strcmp(argv[1], "-generate")) {
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char *teststr, *p;
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int i, initialquote, backslashes, quotes;
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teststr = malloc(200 + strlen(argv[0]));
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for (initialquote = 0; initialquote <= 1; initialquote++) {
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for (backslashes = 0; backslashes < 5; backslashes++) {
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for (quotes = 0; quotes < 9; quotes++) {
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p = teststr + sprintf(teststr, "%s -split ", argv[0]);
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if (initialquote) *p++ = '\'';
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*p++ = 'a';
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for (i = 0; i < backslashes; i++) *p++ = '/';
|
|
for (i = 0; i < quotes; i++) *p++ = '\'';
|
|
*p++ = 'b';
|
|
*p++ = '_';
|
|
*p++ = 'c';
|
|
*p++ = '\'';
|
|
*p++ = '_';
|
|
*p++ = 'd';
|
|
*p = '\0';
|
|
|
|
system(teststr);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
fprintf(stderr, "unrecognised option: \"%s\"\n", argv[1]);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* If we get here, we were invoked with no arguments, so just
|
|
* run the tests.
|
|
*/
|
|
|
|
for (i = 0; i < lenof(argv_tests); i++) {
|
|
int ac;
|
|
char **av;
|
|
|
|
split_into_argv(argv_tests[i].cmdline, &ac, &av);
|
|
|
|
for (j = 0; j < ac && argv_tests[i].argv[j]; j++) {
|
|
if (strcmp(av[j], argv_tests[i].argv[j])) {
|
|
printf("failed test %d (|%s|) arg %d: |%s| should be |%s|\n",
|
|
i, argv_tests[i].cmdline,
|
|
j, av[j], argv_tests[i].argv[j]);
|
|
}
|
|
#ifdef VERBOSE
|
|
else {
|
|
printf("test %d (|%s|) arg %d: |%s| == |%s|\n",
|
|
i, argv_tests[i].cmdline,
|
|
j, av[j], argv_tests[i].argv[j]);
|
|
}
|
|
#endif
|
|
}
|
|
if (j < ac)
|
|
printf("failed test %d (|%s|): %d args returned, should be %d\n",
|
|
i, argv_tests[i].cmdline, ac, j);
|
|
if (argv_tests[i].argv[j])
|
|
printf("failed test %d (|%s|): %d args returned, should be more\n",
|
|
i, argv_tests[i].cmdline, ac);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|