Annotation of src/lib/libc/gen/fnmatch.c, Revision 1.9
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"; */
1.9 ! jtc 39: static char *rcsid = "$Id: fnmatch.c,v 1.8 1993/11/11 03:21:24 jtc 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:
1.9 ! jtc 54: int
1.1 cgd 55: fnmatch(pattern, string, flags)
1.3 jtc 56: register const char *pattern, *string;
1.1 cgd 57: int flags;
58: {
1.8 jtc 59: const char *stringstart = string;
1.1 cgd 60: register char c;
1.3 jtc 61: char test;
1.1 cgd 62:
63: for (;;)
64: switch (c = *pattern++) {
65: case EOS:
1.3 jtc 66: return (*string == EOS ? 0 : FNM_NOMATCH);
1.1 cgd 67: case '?':
1.8 jtc 68: if (*string == EOS)
1.3 jtc 69: return (FNM_NOMATCH);
1.8 jtc 70: if (*string == '/' && (flags & FNM_PATHNAME))
71: return (FNM_NOMATCH);
72: if (*string == '.' && (flags & FNM_PERIOD) &&
73: (string == stringstart || ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
74: return (FNM_NOMATCH);
75: ++string;
1.1 cgd 76: break;
77: case '*':
78: c = *pattern;
1.3 jtc 79: /* Collapse multiple stars. */
1.1 cgd 80: while (c == '*')
81: c = *++pattern;
82:
1.8 jtc 83: if (*string == '.' && (flags & FNM_PERIOD) &&
84: (string == stringstart || ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
85: return (FNM_NOMATCH);
86:
1.3 jtc 87: /* Optimize for pattern with * at end or before /. */
1.1 cgd 88: if (c == EOS)
89: if (flags & FNM_PATHNAME)
1.3 jtc 90: return (index(string, '/') == NULL ?
91: 0 : FNM_NOMATCH);
1.1 cgd 92: else
1.3 jtc 93: return (0);
94: else if (c == '/' && flags & FNM_PATHNAME) {
1.2 mycroft 95: if ((string = index(string, '/')) == NULL)
1.3 jtc 96: return (FNM_NOMATCH);
1.1 cgd 97: break;
98: }
99:
1.3 jtc 100: /* General case, use recursion. */
1.1 cgd 101: while ((test = *string) != EOS) {
1.8 jtc 102: if (!fnmatch(pattern, string, flags & ~FNM_PERIOD))
1.3 jtc 103: return (0);
1.1 cgd 104: if (test == '/' && flags & FNM_PATHNAME)
105: break;
106: ++string;
107: }
1.3 jtc 108: return (FNM_NOMATCH);
1.1 cgd 109: case '[':
1.8 jtc 110: if (*string == EOS)
111: return (FNM_NOMATCH);
112: if (*string == '/' && flags & FNM_PATHNAME)
1.3 jtc 113: return (FNM_NOMATCH);
1.8 jtc 114: if ((pattern = rangematch(pattern, *string, flags)) == NULL)
1.3 jtc 115: return (FNM_NOMATCH);
1.8 jtc 116: ++string;
1.1 cgd 117: break;
118: case '\\':
1.3 jtc 119: if (!(flags & FNM_NOESCAPE)) {
1.1 cgd 120: if ((c = *pattern++) == EOS) {
121: c = '\\';
122: --pattern;
123: }
124: }
125: /* FALLTHROUGH */
126: default:
127: if (c != *string++)
1.3 jtc 128: return (FNM_NOMATCH);
1.1 cgd 129: break;
130: }
1.3 jtc 131: /* NOTREACHED */
132: }
133:
134: static const char *
1.7 jtc 135: rangematch(pattern, test, flags)
1.3 jtc 136: register const char *pattern;
137: register int test;
1.7 jtc 138: int flags;
1.3 jtc 139: {
140: register char c, c2;
141: int negate, ok;
142:
1.7 jtc 143: /* A bracket expression starting with an unquoted circumflex
144: * character produces unspecified results (IEEE 1003.2-1992,
145: * 3.13.2). I have chosen to treat it like '!', for
146: * consistancy with regular expression syntax.
1.3 jtc 147: */
1.7 jtc 148: if (negate = (*pattern == '!' || *pattern == '^')) {
149: pattern++;
150: }
151:
1.3 jtc 152: for (ok = 0; (c = *pattern++) != ']';) {
1.7 jtc 153: if (c == '\\' && !(flags & FNM_NOESCAPE)) {
154: c = *pattern++;
155: }
156: if (c == EOS) {
157: return (NULL);
158: }
159:
160: if (*pattern == '-'
161: && (c2 = *(pattern+1)) != EOS && c2 != ']') {
162: pattern += 2;
163: if (c2 == '\\' && !(flags & FNM_NOESCAPE)) {
164: c2 = *pattern++;
165: }
166: if (c2 == EOS) {
167: return (NULL);
168: }
169:
170: if (c <= test && test <= c2) {
1.3 jtc 171: ok = 1;
1.7 jtc 172: }
173: } else if (c == test) {
174: ok = 1;
1.3 jtc 175: }
176: }
1.7 jtc 177:
1.3 jtc 178: return (ok == negate ? NULL : pattern);
1.1 cgd 179: }
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