368 lines
10 KiB
C
368 lines
10 KiB
C
/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Guido van Rossum.
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*
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* Copyright (c) 2011 The FreeBSD Foundation
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* All rights reserved.
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* Portions of this software were developed by David Chisnall
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)fnmatch.c 8.2 (Berkeley) 4/16/94";
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#endif /* LIBC_SCCS and not lint */
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#include "winsup.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD: head/lib/libc/gen/fnmatch.c 288309 2015-09-27 12:52:18Z jilles $");
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/*
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* Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
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* Compares a filename or pathname to a pattern.
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*/
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/*
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* Some notes on multibyte character support:
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* 1. Patterns with illegal byte sequences match nothing.
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* 2. Illegal byte sequences in the "string" argument are handled by treating
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* them as single-byte characters with a value of the first byte of the
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* sequence cast to wint_t.
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* 3. Multibyte conversion state objects (mbstate_t) are passed around and
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* used for most, but not all, conversions. Further work will be required
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* to support state-dependent encodings.
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*/
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#include <fnmatch.h>
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#include <limits.h>
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#include <string.h>
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#include <wchar.h>
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#include <wctype.h>
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#include "collate.h"
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#define EOS '\0'
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#define RANGE_MATCH 1
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#define RANGE_NOMATCH 0
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#define RANGE_ERROR (-1)
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static int rangematch(const wint_t *, wint_t *, int, wint_t **, mbstate_t *);
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int
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fnmatch(const char *in_pattern, const char *in_string, int flags)
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{
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size_t pclen = strlen (in_pattern);
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size_t sclen = strlen (in_string);
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wint_t *pattern = (wint_t *) alloca ((pclen + 1) * sizeof (wint_t));
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wint_t *string = (wint_t *) alloca ((sclen + 1) * sizeof (wint_t));
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const wint_t *stringstart = string;
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const wint_t *bt_pattern, *bt_string;
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mbstate_t patmbs = { 0 };
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mbstate_t strmbs = { 0 };
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mbstate_t bt_patmbs, bt_strmbs;
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wint_t *newp;
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wint_t *c;
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wint_t *pc, *sc;
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pclen = mbsnrtowci (pattern, &in_pattern, (size_t) -1, pclen, &patmbs);
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if (pclen == (size_t) -1)
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return (FNM_NOMATCH);
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pattern[pclen] = '\0';
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sclen = mbsnrtowci (string, &in_string, (size_t) -1, sclen, &strmbs);
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if (sclen == (size_t) -1)
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return (FNM_NOMATCH);
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string[sclen] = '\0';
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bt_pattern = bt_string = NULL;
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for (;;) {
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pc = pattern++;
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sc = string;
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switch (*pc) {
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case EOS:
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if ((flags & FNM_LEADING_DIR) && *sc == '/')
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return (0);
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if (*sc == EOS)
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return (0);
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goto backtrack;
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case '?':
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if (*sc == EOS)
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return (FNM_NOMATCH);
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if (*sc == '/' && (flags & FNM_PATHNAME))
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goto backtrack;
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if (*sc == '.' && (flags & FNM_PERIOD) &&
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(string == stringstart ||
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((flags & FNM_PATHNAME) && *(string - 1) == '/')))
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goto backtrack;
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++string;
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break;
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case '*':
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c = pattern;
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/* Collapse multiple stars. */
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while (*c == '*')
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*c = *++pattern;
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if (*sc == '.' && (flags & FNM_PERIOD) &&
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(string == stringstart ||
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((flags & FNM_PATHNAME) && *(string - 1) == '/')))
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goto backtrack;
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/* Optimize for pattern with * at end or before /. */
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if (*c == EOS)
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if (flags & FNM_PATHNAME)
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return ((flags & FNM_LEADING_DIR) ||
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wcichr(string, '/') == NULL ?
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0 : FNM_NOMATCH);
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else
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return (0);
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else if (*c == '/' && flags & FNM_PATHNAME) {
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if ((string = wcichr(string, '/')) == NULL)
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return (FNM_NOMATCH);
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break;
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}
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/*
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* First try the shortest match for the '*' that
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* could work. We can forget any earlier '*' since
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* there is no way having it match more characters
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* can help us, given that we are already here.
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*/
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bt_pattern = pattern;
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bt_patmbs = patmbs;
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bt_string = string;
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bt_strmbs = strmbs;
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break;
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case '[':
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if (*sc == EOS)
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return (FNM_NOMATCH);
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if (*sc == '/' && (flags & FNM_PATHNAME))
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goto backtrack;
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if (*sc == '.' && (flags & FNM_PERIOD) &&
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(string == stringstart ||
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((flags & FNM_PATHNAME) && *(string - 1) == '/')))
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goto backtrack;
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int ret = rangematch(pattern, sc, flags, &newp,
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&patmbs);
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switch (ret) {
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case RANGE_ERROR:
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goto norm;
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case RANGE_NOMATCH:
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goto backtrack;
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default: /* > 0 ... case RANGE_MATCH */
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pattern = newp;
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break;
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}
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string += ret;
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break;
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case '\\':
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if (!(flags & FNM_NOESCAPE)) {
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pc = pattern++;
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}
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fallthrough;
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default:
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norm:
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++string;
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if (*pc == *sc)
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;
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else if ((flags & FNM_CASEFOLD) &&
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(towlower(*pc) == towlower(*sc)))
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;
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else {
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backtrack:
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/*
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* If we have a mismatch (other than hitting
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* the end of the string), go back to the last
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* '*' seen and have it match one additional
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* character.
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*/
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if (bt_pattern == NULL)
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return (FNM_NOMATCH);
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sc = (wint_t *) bt_string;
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if (*sc == EOS)
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return (FNM_NOMATCH);
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if (*sc == '/' && flags & FNM_PATHNAME)
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return (FNM_NOMATCH);
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++bt_string;
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pattern = (wint_t *) bt_pattern;
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patmbs = bt_patmbs;
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string = (wint_t *) bt_string;
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strmbs = bt_strmbs;
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}
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break;
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}
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}
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/* NOTREACHED */
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}
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/* Return value is either '\0', ':', '.', '=', or '[' if no class
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expression found. cptr_p is set to the next character which needs
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checking. */
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static inline wint_t
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check_classes_expr(const wint_t **cptr_p, wint_t *classbuf, size_t classbufsize)
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{
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const wint_t *ctype = NULL;
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const wint_t *cptr = *cptr_p;
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if (*cptr == '[' &&
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(cptr[1] == ':' || cptr[1] == '.' || cptr[1] == '=')) {
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ctype = ++cptr;
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while (*++cptr && (*cptr != *ctype || cptr[1] != ']'))
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;
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if (!*cptr)
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return '\0';
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if (classbuf) {
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const wint_t *class_p = ctype + 1;
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size_t clen = cptr - class_p;
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if (clen < classbufsize)
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*wcipncpy (classbuf, class_p, clen) = '\0';
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else
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ctype = NULL;
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}
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cptr += 2; /* Advance cptr to next char after class expr. */
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}
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*cptr_p = cptr;
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return ctype ? *ctype : '[';
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}
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static int
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rangematch(const wint_t *pattern, wint_t *test, int flags, wint_t **newp,
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mbstate_t *patmbs)
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{
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int negate, ok;
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wint_t *c, *c2;
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//size_t pclen;
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const wint_t *origpat;
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size_t tlen = next_unicode_char (test);
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/*
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* A bracket expression starting with an unquoted circumflex
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* character produces unspecified results (IEEE 1003.2-1992,
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* 3.13.2). This implementation treats it like '!', for
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* consistency with the regular expression syntax.
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* J.T. Conklin (conklin@ngai.kaleida.com)
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*/
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if ( (negate = (*pattern == '!' || *pattern == '^')) )
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++pattern;
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if (flags & FNM_CASEFOLD) {
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for (int idx = 0; idx < tlen; ++idx)
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test[idx] = towlower(test[idx]);
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}
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/*
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* A right bracket shall lose its special meaning and represent
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* itself in a bracket expression if it occurs first in the list.
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* -- POSIX.2 2.8.3.2
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*/
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ok = 0;
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origpat = pattern;
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for (;;) {
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wint_t wclass[64], wclass2[64];
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char cclass[64];
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wint_t ctype;
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size_t clen = 1, c2len = 1;
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if (*pattern == ']' && pattern > origpat) {
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pattern++;
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break;
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} else if (*pattern == '\0') {
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return (RANGE_ERROR);
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} else if (*pattern == '/' && (flags & FNM_PATHNAME)) {
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return (RANGE_NOMATCH);
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} else if (*pattern == '\\' && !(flags & FNM_NOESCAPE))
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pattern++;
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switch (ctype = check_classes_expr (&pattern, wclass, 64)) {
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case ':':
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/* No worries, char classes are ASCII-only */
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wcitoascii (cclass, wclass);
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if (iswctype (*test, wctype (cclass)))
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ok = 1;
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continue;
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case '=':
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if (wcilen (wclass) == 1 &&
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is_unicode_equiv (*test, *wclass))
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ok = 1;
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continue;
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case '.':
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if (!is_unicode_coll_elem (wclass))
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return (RANGE_NOMATCH);
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c = wclass;
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clen = wcilen (wclass);
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break;
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default:
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c = (wint_t *) pattern++;
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break;
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}
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if (flags & FNM_CASEFOLD) {
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for (int idx = 0; idx < tlen; ++idx)
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c[idx] = towlower(c[idx]);
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}
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if (*pattern == '-' && *(pattern + 1) != EOS &&
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*(pattern + 1) != ']') {
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if (*++pattern == '\\' && !(flags & FNM_NOESCAPE))
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if (*pattern != EOS)
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pattern++;
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const wint_t *orig_pattern = pattern;
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switch (ctype = check_classes_expr (&pattern, wclass2,
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64)) {
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case '.':
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if (!is_unicode_coll_elem (wclass2))
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return (RANGE_NOMATCH);
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c2 = wclass2;
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c2len = wcilen (wclass2);
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break;
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default:
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pattern = orig_pattern;
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c2 = (wint_t *) pattern++;
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}
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if (*c2 == EOS)
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return (RANGE_ERROR);
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if (flags & FNM_CASEFOLD) {
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for (int idx = 0; idx < tlen; ++idx)
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c2[idx] = towlower(c2[idx]);
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}
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if ((!__get_current_collate_locale ()->win_locale[0]) ?
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*c <= *test && *test <= *c2 :
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__wscollate_range_cmp(c, test, clen, tlen) <= 0
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&& __wscollate_range_cmp(test, c2, tlen, c2len) <= 0
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)
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ok = 1;
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} else if (clen == tlen && wcincmp (c, test, clen) == 0)
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ok = 1;
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}
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*newp = (wint_t *) pattern;
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return (ok == negate ? RANGE_NOMATCH : tlen);
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}
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