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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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