Annotation of src/lib/libc/gen/fnmatch.c, Revision 1.3
1.1 cgd 1: /*
2: * Copyright (c) 1989 The Regents of the University of California.
3: * All rights reserved.
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)
1.3 ! jtc 38: static char sccsid[] = "@(#)fnmatch.c 5.6 (Berkeley) 6/28/92";
1.1 cgd 39: #endif /* LIBC_SCCS and not lint */
40:
41: /*
1.3 ! jtc 42: * Function fnmatch() as proposed in POSIX 1003.2 B.6 (D11.2).
1.1 cgd 43: * Compares a filename or pathname to a pattern.
44: */
45:
1.3 ! jtc 46: #include <fnmatch.h>
1.1 cgd 47: #include <string.h>
48:
49: #define EOS '\0'
50:
1.3 ! jtc 51: static const char *rangematch __P((const char *, int));
1.1 cgd 52:
53: fnmatch(pattern, string, flags)
1.3 ! jtc 54: register const char *pattern, *string;
1.1 cgd 55: int flags;
56: {
57: register char c;
1.3 ! jtc 58: char test;
1.1 cgd 59:
60: for (;;)
61: switch (c = *pattern++) {
62: case EOS:
1.3 ! jtc 63: return (*string == EOS ? 0 : FNM_NOMATCH);
1.1 cgd 64: case '?':
1.3 ! jtc 65: if ((test = *string++) == EOS ||
! 66: test == '/' && flags & FNM_PATHNAME)
! 67: return (FNM_NOMATCH);
1.1 cgd 68: break;
69: case '*':
70: c = *pattern;
1.3 ! jtc 71: /* Collapse multiple stars. */
1.1 cgd 72: while (c == '*')
73: c = *++pattern;
74:
1.3 ! jtc 75: /* Optimize for pattern with * at end or before /. */
1.1 cgd 76: if (c == EOS)
77: if (flags & FNM_PATHNAME)
1.3 ! jtc 78: return (index(string, '/') == NULL ?
! 79: 0 : FNM_NOMATCH);
1.1 cgd 80: else
1.3 ! jtc 81: return (0);
! 82: else if (c == '/' && flags & FNM_PATHNAME) {
1.2 mycroft 83: if ((string = index(string, '/')) == NULL)
1.3 ! jtc 84: return (FNM_NOMATCH);
1.1 cgd 85: break;
86: }
87:
1.3 ! jtc 88: /* General case, use recursion. */
1.1 cgd 89: while ((test = *string) != EOS) {
1.2 mycroft 90: if (!fnmatch(pattern, string, flags))
1.3 ! jtc 91: return (0);
1.1 cgd 92: if (test == '/' && flags & FNM_PATHNAME)
93: break;
94: ++string;
95: }
1.3 ! jtc 96: return (FNM_NOMATCH);
1.1 cgd 97: case '[':
98: if ((test = *string++) == EOS ||
99: test == '/' && flags & FNM_PATHNAME)
1.3 ! jtc 100: return (FNM_NOMATCH);
1.1 cgd 101: if ((pattern = rangematch(pattern, test)) == NULL)
1.3 ! jtc 102: return (FNM_NOMATCH);
1.1 cgd 103: break;
104: case '\\':
1.3 ! jtc 105: if (!(flags & FNM_NOESCAPE)) {
1.1 cgd 106: if ((c = *pattern++) == EOS) {
107: c = '\\';
108: --pattern;
109: }
110: if (c != *string++)
1.3 ! jtc 111: return (FNM_NOMATCH);
1.1 cgd 112: break;
113: }
114: /* FALLTHROUGH */
115: default:
116: if (c != *string++)
1.3 ! jtc 117: return (FNM_NOMATCH);
1.1 cgd 118: break;
119: }
1.3 ! jtc 120: /* NOTREACHED */
! 121: }
! 122:
! 123: static const char *
! 124: rangematch(pattern, test)
! 125: register const char *pattern;
! 126: register int test;
! 127: {
! 128: register char c, c2;
! 129: int negate, ok;
! 130:
! 131: if (negate = (*pattern == '!'))
! 132: ++pattern;
! 133:
! 134: /*
! 135: * XXX
! 136: * TO DO: quoting
! 137: */
! 138: for (ok = 0; (c = *pattern++) != ']';) {
! 139: if (c == EOS)
! 140: return (NULL); /* Illegal pattern. */
! 141: if (*pattern == '-' && (c2 = pattern[1]) != EOS && c2 != ']') {
! 142: if (c <= test && test <= c2)
! 143: ok = 1;
! 144: pattern += 2;
! 145: }
! 146: else if (c == test)
! 147: ok = 1;
! 148: }
! 149: return (ok == negate ? NULL : pattern);
1.1 cgd 150: }
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