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Annotation of src/lib/libc/gen/fnmatch.c, Revision 1.2

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)
                     38: static char sccsid[] = "@(#)fnmatch.c  5.4 (Berkeley) 2/23/91";
                     39: #endif /* LIBC_SCCS and not lint */
                     40:
                     41: /*
                     42:  * Function fnmatch() as proposed in Posix 1003.2 B.6 (rev. 9).
                     43:  * Compares a filename or pathname to a pattern.
                     44:  */
                     45:
                     46: #include <unistd.h>
                     47: #include <string.h>
                     48:
                     49: #define        EOS     '\0'
                     50:
                     51: static char *
                     52: rangematch(pattern, test)
                     53:        register char *pattern, test;
                     54: {
                     55:        register char c, c2;
                     56:        int negate, ok;
                     57:
                     58:        if (negate = (*pattern == '!'))
                     59:                ++pattern;
                     60:
                     61:        /*
                     62:         * TO DO: quoting
                     63:         */
                     64:
                     65:        for (ok = 0; (c = *pattern++) != ']';) {
                     66:                if (c == EOS)
                     67:                        return(NULL);           /* illegal pattern */
                     68:                if (*pattern == '-' && (c2 = pattern[1]) != EOS && c2 != ']') {
                     69:                        if (c <= test && test <= c2)
                     70:                                ok = 1;
                     71:                        pattern += 2;
                     72:                }
                     73:                else if (c == test)
                     74:                        ok = 1;
                     75:        }
                     76:        return(ok == negate ? NULL : pattern);
                     77: }
                     78:
                     79: fnmatch(pattern, string, flags)
                     80:        register const char *pattern;
                     81:        register const char *string;
                     82:        int flags;
                     83: {
                     84:        register char c;
                     85:        char test, *rangematch();
                     86:
                     87:        for (;;)
                     88:                switch (c = *pattern++) {
                     89:                case EOS:
1.2     ! mycroft    90:                        return(!(*string == EOS));
1.1       cgd        91:                case '?':
1.2     ! mycroft    92:                        if (((test = *string++) == EOS) ||
        !            93:                            ((test == '/') && (flags & FNM_PATHNAME)))
        !            94:                                return(1);
1.1       cgd        95:                        break;
                     96:                case '*':
                     97:                        c = *pattern;
                     98:                        /* collapse multiple stars */
                     99:                        while (c == '*')
                    100:                                c = *++pattern;
                    101:
                    102:                        /* optimize for pattern with * at end or before / */
                    103:                        if (c == EOS)
                    104:                                if (flags & FNM_PATHNAME)
1.2     ! mycroft   105:                                        return(index(string, '/') != NULL);
1.1       cgd       106:                                else
1.2     ! mycroft   107:                                        return(0);
        !           108:                        else if ((c == '/') && (flags & FNM_PATHNAME)) {
        !           109:                                if ((string = index(string, '/')) == NULL)
1.1       cgd       110:                                        return(1);
                    111:                                break;
                    112:                        }
                    113:
                    114:                        /* general case, use recursion */
                    115:                        while ((test = *string) != EOS) {
1.2     ! mycroft   116:                                if (!fnmatch(pattern, string, flags))
        !           117:                                        return(0);
1.1       cgd       118:                                if (test == '/' && flags & FNM_PATHNAME)
                    119:                                        break;
                    120:                                ++string;
                    121:                        }
1.2     ! mycroft   122:                        return(1);
1.1       cgd       123:                case '[':
                    124:                        if ((test = *string++) == EOS ||
                    125:                            test == '/' && flags & FNM_PATHNAME)
1.2     ! mycroft   126:                                return(1);
1.1       cgd       127:                        if ((pattern = rangematch(pattern, test)) == NULL)
1.2     ! mycroft   128:                                return(1);
1.1       cgd       129:                        break;
                    130:                case '\\':
                    131:                        if (flags & FNM_QUOTE) {
                    132:                                if ((c = *pattern++) == EOS) {
                    133:                                        c = '\\';
                    134:                                        --pattern;
                    135:                                }
                    136:                                if (c != *string++)
1.2     ! mycroft   137:                                        return(1);
1.1       cgd       138:                                break;
                    139:                        }
                    140:                        /* FALLTHROUGH */
                    141:                default:
                    142:                        if (c != *string++)
1.2     ! mycroft   143:                                return(1);
1.1       cgd       144:                        break;
                    145:                }
                    146: }

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