Annotation of src/lib/libc/gen/fnmatch.c, Revision 1.7
1.1 cgd 1: /*
1.6 cgd 2: * Copyright (c) 1989, 1993
3: * The Regents of the University of California. All rights reserved.
1.1 cgd 4: *
5: * This code is derived from software contributed to Berkeley by
6: * Guido van Rossum.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #if defined(LIBC_SCCS) && !defined(lint)
1.6 cgd 38: /* from: static char sccsid[] = "@(#)fnmatch.c 8.1 (Berkeley) 6/4/93"; */
1.7 ! jtc 39: static char *rcsid = "$Id: fnmatch.c,v 1.6 1993/11/06 00:52:40 cgd Exp $";
1.1 cgd 40: #endif /* LIBC_SCCS and not lint */
41:
42: /*
1.7 ! jtc 43: * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
1.1 cgd 44: * Compares a filename or pathname to a pattern.
45: */
46:
1.3 jtc 47: #include <fnmatch.h>
1.1 cgd 48: #include <string.h>
49:
50: #define EOS '\0'
51:
1.7 ! jtc 52: static const char *rangematch __P((const char *, int, int));
1.1 cgd 53:
54: fnmatch(pattern, string, flags)
1.3 jtc 55: register const char *pattern, *string;
1.1 cgd 56: int flags;
57: {
58: register char c;
1.3 jtc 59: char test;
1.1 cgd 60:
61: for (;;)
62: switch (c = *pattern++) {
63: case EOS:
1.3 jtc 64: return (*string == EOS ? 0 : FNM_NOMATCH);
1.1 cgd 65: case '?':
1.3 jtc 66: if ((test = *string++) == EOS ||
67: test == '/' && flags & FNM_PATHNAME)
68: return (FNM_NOMATCH);
1.1 cgd 69: break;
70: case '*':
71: c = *pattern;
1.3 jtc 72: /* Collapse multiple stars. */
1.1 cgd 73: while (c == '*')
74: c = *++pattern;
75:
1.3 jtc 76: /* Optimize for pattern with * at end or before /. */
1.1 cgd 77: if (c == EOS)
78: if (flags & FNM_PATHNAME)
1.3 jtc 79: return (index(string, '/') == NULL ?
80: 0 : FNM_NOMATCH);
1.1 cgd 81: else
1.3 jtc 82: return (0);
83: else if (c == '/' && flags & FNM_PATHNAME) {
1.2 mycroft 84: if ((string = index(string, '/')) == NULL)
1.3 jtc 85: return (FNM_NOMATCH);
1.1 cgd 86: break;
87: }
88:
1.3 jtc 89: /* General case, use recursion. */
1.1 cgd 90: while ((test = *string) != EOS) {
1.2 mycroft 91: if (!fnmatch(pattern, string, flags))
1.3 jtc 92: return (0);
1.1 cgd 93: if (test == '/' && flags & FNM_PATHNAME)
94: break;
95: ++string;
96: }
1.3 jtc 97: return (FNM_NOMATCH);
1.1 cgd 98: case '[':
99: if ((test = *string++) == EOS ||
100: test == '/' && flags & FNM_PATHNAME)
1.3 jtc 101: return (FNM_NOMATCH);
1.7 ! jtc 102: if ((pattern = rangematch(pattern, test, flags)) == NULL)
1.3 jtc 103: return (FNM_NOMATCH);
1.1 cgd 104: break;
105: case '\\':
1.3 jtc 106: if (!(flags & FNM_NOESCAPE)) {
1.1 cgd 107: if ((c = *pattern++) == EOS) {
108: c = '\\';
109: --pattern;
110: }
111: }
112: /* FALLTHROUGH */
113: default:
114: if (c != *string++)
1.3 jtc 115: return (FNM_NOMATCH);
1.1 cgd 116: break;
117: }
1.3 jtc 118: /* NOTREACHED */
119: }
120:
121: static const char *
1.7 ! jtc 122: rangematch(pattern, test, flags)
1.3 jtc 123: register const char *pattern;
124: register int test;
1.7 ! jtc 125: int flags;
1.3 jtc 126: {
127: register char c, c2;
128: int negate, ok;
129:
1.7 ! jtc 130: /* A bracket expression starting with an unquoted circumflex
! 131: * character produces unspecified results (IEEE 1003.2-1992,
! 132: * 3.13.2). I have chosen to treat it like '!', for
! 133: * consistancy with regular expression syntax.
1.3 jtc 134: */
1.7 ! jtc 135: if (negate = (*pattern == '!' || *pattern == '^')) {
! 136: pattern++;
! 137: }
! 138:
1.3 jtc 139: for (ok = 0; (c = *pattern++) != ']';) {
1.7 ! jtc 140: if (c == '\\' && !(flags & FNM_NOESCAPE)) {
! 141: c = *pattern++;
! 142: }
! 143: if (c == EOS) {
! 144: return (NULL);
! 145: }
! 146:
! 147: if (*pattern == '-'
! 148: && (c2 = *(pattern+1)) != EOS && c2 != ']') {
! 149: pattern += 2;
! 150: if (c2 == '\\' && !(flags & FNM_NOESCAPE)) {
! 151: c2 = *pattern++;
! 152: }
! 153: if (c2 == EOS) {
! 154: return (NULL);
! 155: }
! 156:
! 157: if (c <= test && test <= c2) {
1.3 jtc 158: ok = 1;
1.7 ! jtc 159: }
! 160: } else if (c == test) {
! 161: ok = 1;
1.3 jtc 162: }
163: }
1.7 ! jtc 164:
1.3 jtc 165: return (ok == negate ? NULL : pattern);
1.1 cgd 166: }
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