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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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