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Annotation of src/lib/libc/gen/fnmatch.c, Revision 1.24.4.1

1.24.4.1! yamt        1: /*     $NetBSD$        */
1.11      cgd         2:
1.1       cgd         3: /*
1.11      cgd         4:  * Copyright (c) 1989, 1993, 1994
1.6       cgd         5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      7:  * This code is derived from software contributed to Berkeley by
                      8:  * Guido van Rossum.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
1.20      agc        18:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        19:  *    may be used to endorse or promote products derived from this software
                     20:  *    without specific prior written permission.
                     21:  *
                     22:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     23:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     24:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     25:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     26:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     27:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     28:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     29:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     30:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     31:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     32:  * SUCH DAMAGE.
                     33:  */
                     34:
1.12      christos   35: #include <sys/cdefs.h>
1.1       cgd        36: #if defined(LIBC_SCCS) && !defined(lint)
1.11      cgd        37: #if 0
                     38: static char sccsid[] = "@(#)fnmatch.c  8.2 (Berkeley) 4/16/94";
                     39: #else
1.24.4.1! yamt       40: __RCSID("$NetBSD$");
1.11      cgd        41: #endif
1.1       cgd        42: #endif /* LIBC_SCCS and not lint */
                     43:
                     44: /*
1.7       jtc        45:  * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
1.1       cgd        46:  * Compares a filename or pathname to a pattern.
                     47:  */
                     48:
1.13      jtc        49: #include "namespace.h"
1.15      lukem      50:
                     51: #include <assert.h>
1.18      thorpej    52: #include <ctype.h>
1.3       jtc        53: #include <fnmatch.h>
1.1       cgd        54: #include <string.h>
1.13      jtc        55:
                     56: #ifdef __weak_alias
1.17      mycroft    57: __weak_alias(fnmatch,_fnmatch)
1.13      jtc        58: #endif
1.1       cgd        59:
                     60: #define        EOS     '\0'
                     61:
1.21      perry      62: static inline int
1.18      thorpej    63: foldcase(int ch, int flags)
                     64: {
                     65:
                     66:        if ((flags & FNM_CASEFOLD) != 0 && isupper(ch))
1.22      christos   67:                return tolower(ch);
                     68:        return ch;
1.18      thorpej    69: }
                     70:
                     71: #define        FOLDCASE(ch, flags)     foldcase((unsigned char)(ch), (flags))
                     72:
1.22      christos   73: static const char *
                     74: rangematch(const char *pattern, int test, int flags)
                     75: {
                     76:        int negate, ok;
                     77:        char c, c2;
                     78:
                     79:        _DIAGASSERT(pattern != NULL);
                     80:
                     81:        /*
                     82:         * A bracket expression starting with an unquoted circumflex
                     83:         * character produces unspecified results (IEEE 1003.2-1992,
                     84:         * 3.13.2).  This implementation treats it like '!', for
                     85:         * consistency with the regular expression syntax.
                     86:         * J.T. Conklin (conklin@ngai.kaleida.com)
                     87:         */
                     88:        if ((negate = (*pattern == '!' || *pattern == '^')) != 0)
                     89:                ++pattern;
                     90:
                     91:        for (ok = 0; (c = FOLDCASE(*pattern++, flags)) != ']';) {
                     92:                if (c == '\\' && !(flags & FNM_NOESCAPE))
                     93:                        c = FOLDCASE(*pattern++, flags);
                     94:                if (c == EOS)
                     95:                        return NULL;
                     96:                if (*pattern == '-'
                     97:                    && (c2 = FOLDCASE(*(pattern + 1), flags)) != EOS &&
                     98:                        c2 != ']') {
                     99:                        pattern += 2;
                    100:                        if (c2 == '\\' && !(flags & FNM_NOESCAPE))
                    101:                                c2 = FOLDCASE(*pattern++, flags);
                    102:                        if (c2 == EOS)
                    103:                                return NULL;
                    104:                        if (c <= test && test <= c2)
                    105:                                ok = 1;
                    106:                } else if (c == test)
                    107:                        ok = 1;
                    108:        }
                    109:        return ok == negate ? NULL : pattern;
                    110: }
                    111:
                    112:
                    113: static int
                    114: fnmatchx(const char *pattern, const char *string, int flags, size_t recursion)
1.1       cgd       115: {
1.11      cgd       116:        const char *stringstart;
                    117:        char c, test;
1.1       cgd       118:
1.15      lukem     119:        _DIAGASSERT(pattern != NULL);
                    120:        _DIAGASSERT(string != NULL);
                    121:
1.22      christos  122:        if (recursion-- == 0)
                    123:                return FNM_NORES;
                    124:
1.24      christos  125:        for (stringstart = string;;) {
1.18      thorpej   126:                switch (c = FOLDCASE(*pattern++, flags)) {
1.1       cgd       127:                case EOS:
1.19      provos    128:                        if ((flags & FNM_LEADING_DIR) && *string == '/')
1.22      christos  129:                                return 0;
                    130:                        return *string == EOS ? 0 : FNM_NOMATCH;
1.1       cgd       131:                case '?':
1.8       jtc       132:                        if (*string == EOS)
1.22      christos  133:                                return FNM_NOMATCH;
1.8       jtc       134:                        if (*string == '/' && (flags & FNM_PATHNAME))
1.22      christos  135:                                return FNM_NOMATCH;
1.8       jtc       136:                        if (*string == '.' && (flags & FNM_PERIOD) &&
1.11      cgd       137:                            (string == stringstart ||
                    138:                            ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
1.22      christos  139:                                return FNM_NOMATCH;
1.8       jtc       140:                        ++string;
1.1       cgd       141:                        break;
                    142:                case '*':
1.18      thorpej   143:                        c = FOLDCASE(*pattern, flags);
1.3       jtc       144:                        /* Collapse multiple stars. */
1.1       cgd       145:                        while (c == '*')
1.18      thorpej   146:                                c = FOLDCASE(*++pattern, flags);
1.1       cgd       147:
1.8       jtc       148:                        if (*string == '.' && (flags & FNM_PERIOD) &&
1.11      cgd       149:                            (string == stringstart ||
                    150:                            ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
1.22      christos  151:                                return FNM_NOMATCH;
1.8       jtc       152:
1.3       jtc       153:                        /* Optimize for pattern with * at end or before /. */
1.14      christos  154:                        if (c == EOS) {
1.1       cgd       155:                                if (flags & FNM_PATHNAME)
1.22      christos  156:                                        return (flags & FNM_LEADING_DIR) ||
1.19      provos    157:                                            strchr(string, '/') == NULL ?
1.22      christos  158:                                            0 : FNM_NOMATCH;
1.1       cgd       159:                                else
1.22      christos  160:                                        return 0;
1.14      christos  161:                        } else if (c == '/' && flags & FNM_PATHNAME) {
1.10      jtc       162:                                if ((string = strchr(string, '/')) == NULL)
1.22      christos  163:                                        return FNM_NOMATCH;
1.1       cgd       164:                                break;
                    165:                        }
                    166:
1.3       jtc       167:                        /* General case, use recursion. */
1.18      thorpej   168:                        while ((test = FOLDCASE(*string, flags)) != EOS) {
1.22      christos  169:                                int e;
                    170:                                switch ((e = fnmatchx(pattern, string,
                    171:                                    flags & ~FNM_PERIOD, recursion))) {
                    172:                                case FNM_NOMATCH:
                    173:                                        break;
                    174:                                default:
                    175:                                        return e;
                    176:                                }
1.1       cgd       177:                                if (test == '/' && flags & FNM_PATHNAME)
                    178:                                        break;
                    179:                                ++string;
                    180:                        }
1.22      christos  181:                        return FNM_NOMATCH;
1.1       cgd       182:                case '[':
1.8       jtc       183:                        if (*string == EOS)
1.22      christos  184:                                return FNM_NOMATCH;
1.8       jtc       185:                        if (*string == '/' && flags & FNM_PATHNAME)
1.22      christos  186:                                return FNM_NOMATCH;
                    187:                        if ((pattern = rangematch(pattern,
                    188:                            FOLDCASE(*string, flags), flags)) == NULL)
                    189:                                return FNM_NOMATCH;
1.8       jtc       190:                        ++string;
1.1       cgd       191:                        break;
                    192:                case '\\':
1.3       jtc       193:                        if (!(flags & FNM_NOESCAPE)) {
1.18      thorpej   194:                                if ((c = FOLDCASE(*pattern++, flags)) == EOS) {
1.24.4.1! yamt      195:                                        c = '\0';
1.1       cgd       196:                                        --pattern;
                    197:                                }
                    198:                        }
                    199:                        /* FALLTHROUGH */
                    200:                default:
1.18      thorpej   201:                        if (c != FOLDCASE(*string++, flags))
1.22      christos  202:                                return FNM_NOMATCH;
1.1       cgd       203:                        break;
                    204:                }
1.24      christos  205:        }
1.3       jtc       206:        /* NOTREACHED */
                    207: }
                    208:
1.22      christos  209: int
                    210: fnmatch(const char *pattern, const char *string, int flags)
1.3       jtc       211: {
1.23      christos  212:        return fnmatchx(pattern, string, flags, 64);
1.1       cgd       213: }

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