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Annotation of src/lib/libc/gen/fnmatch.c, Revision 1.21

1.21    ! perry       1: /*     $NetBSD: fnmatch.c,v 1.20 2003/08/07 16:42:48 agc Exp $ */
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
1.21    ! perry      40: __RCSID("$NetBSD: fnmatch.c,v 1.20 2003/08/07 16:42:48 agc Exp $");
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:
1.7       jtc        62: static const char *rangematch __P((const char *, int, int));
1.1       cgd        63:
1.21    ! perry      64: static inline int
1.18      thorpej    65: foldcase(int ch, int flags)
                     66: {
                     67:
                     68:        if ((flags & FNM_CASEFOLD) != 0 && isupper(ch))
                     69:                return (tolower(ch));
                     70:        return (ch);
                     71: }
                     72:
                     73: #define        FOLDCASE(ch, flags)     foldcase((unsigned char)(ch), (flags))
                     74:
1.9       jtc        75: int
1.1       cgd        76: fnmatch(pattern, string, flags)
1.11      cgd        77:        const char *pattern, *string;
1.1       cgd        78:        int flags;
                     79: {
1.11      cgd        80:        const char *stringstart;
                     81:        char c, test;
1.1       cgd        82:
1.15      lukem      83:        _DIAGASSERT(pattern != NULL);
                     84:        _DIAGASSERT(string != NULL);
                     85:
1.11      cgd        86:        for (stringstart = string;;)
1.18      thorpej    87:                switch (c = FOLDCASE(*pattern++, flags)) {
1.1       cgd        88:                case EOS:
1.19      provos     89:                        if ((flags & FNM_LEADING_DIR) && *string == '/')
                     90:                                return (0);
1.3       jtc        91:                        return (*string == EOS ? 0 : FNM_NOMATCH);
1.1       cgd        92:                case '?':
1.8       jtc        93:                        if (*string == EOS)
1.3       jtc        94:                                return (FNM_NOMATCH);
1.8       jtc        95:                        if (*string == '/' && (flags & FNM_PATHNAME))
                     96:                                return (FNM_NOMATCH);
                     97:                        if (*string == '.' && (flags & FNM_PERIOD) &&
1.11      cgd        98:                            (string == stringstart ||
                     99:                            ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
1.8       jtc       100:                                return (FNM_NOMATCH);
                    101:                        ++string;
1.1       cgd       102:                        break;
                    103:                case '*':
1.18      thorpej   104:                        c = FOLDCASE(*pattern, flags);
1.3       jtc       105:                        /* Collapse multiple stars. */
1.1       cgd       106:                        while (c == '*')
1.18      thorpej   107:                                c = FOLDCASE(*++pattern, flags);
1.1       cgd       108:
1.8       jtc       109:                        if (*string == '.' && (flags & FNM_PERIOD) &&
1.11      cgd       110:                            (string == stringstart ||
                    111:                            ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
1.8       jtc       112:                                return (FNM_NOMATCH);
                    113:
1.3       jtc       114:                        /* Optimize for pattern with * at end or before /. */
1.14      christos  115:                        if (c == EOS) {
1.1       cgd       116:                                if (flags & FNM_PATHNAME)
1.19      provos    117:                                        return ((flags & FNM_LEADING_DIR) ||
                    118:                                            strchr(string, '/') == NULL ?
1.3       jtc       119:                                            0 : FNM_NOMATCH);
1.1       cgd       120:                                else
1.3       jtc       121:                                        return (0);
1.14      christos  122:                        } else if (c == '/' && flags & FNM_PATHNAME) {
1.10      jtc       123:                                if ((string = strchr(string, '/')) == NULL)
1.3       jtc       124:                                        return (FNM_NOMATCH);
1.1       cgd       125:                                break;
                    126:                        }
                    127:
1.3       jtc       128:                        /* General case, use recursion. */
1.18      thorpej   129:                        while ((test = FOLDCASE(*string, flags)) != EOS) {
                    130:                                if (!fnmatch(pattern, string,
                    131:                                             flags & ~FNM_PERIOD))
1.3       jtc       132:                                        return (0);
1.1       cgd       133:                                if (test == '/' && flags & FNM_PATHNAME)
                    134:                                        break;
                    135:                                ++string;
                    136:                        }
1.3       jtc       137:                        return (FNM_NOMATCH);
1.1       cgd       138:                case '[':
1.8       jtc       139:                        if (*string == EOS)
                    140:                                return (FNM_NOMATCH);
                    141:                        if (*string == '/' && flags & FNM_PATHNAME)
1.3       jtc       142:                                return (FNM_NOMATCH);
1.11      cgd       143:                        if ((pattern =
1.18      thorpej   144:                            rangematch(pattern, FOLDCASE(*string, flags),
                    145:                                       flags)) == NULL)
1.3       jtc       146:                                return (FNM_NOMATCH);
1.8       jtc       147:                        ++string;
1.1       cgd       148:                        break;
                    149:                case '\\':
1.3       jtc       150:                        if (!(flags & FNM_NOESCAPE)) {
1.18      thorpej   151:                                if ((c = FOLDCASE(*pattern++, flags)) == EOS) {
1.1       cgd       152:                                        c = '\\';
                    153:                                        --pattern;
                    154:                                }
                    155:                        }
                    156:                        /* FALLTHROUGH */
                    157:                default:
1.18      thorpej   158:                        if (c != FOLDCASE(*string++, flags))
1.3       jtc       159:                                return (FNM_NOMATCH);
1.1       cgd       160:                        break;
                    161:                }
1.3       jtc       162:        /* NOTREACHED */
                    163: }
                    164:
                    165: static const char *
1.7       jtc       166: rangematch(pattern, test, flags)
1.11      cgd       167:        const char *pattern;
                    168:        int test, flags;
1.3       jtc       169: {
                    170:        int negate, ok;
1.11      cgd       171:        char c, c2;
1.15      lukem     172:
                    173:        _DIAGASSERT(pattern != NULL);
1.3       jtc       174:
1.11      cgd       175:        /*
                    176:         * A bracket expression starting with an unquoted circumflex
1.7       jtc       177:         * character produces unspecified results (IEEE 1003.2-1992,
1.11      cgd       178:         * 3.13.2).  This implementation treats it like '!', for
                    179:         * consistency with the regular expression syntax.
                    180:         * J.T. Conklin (conklin@ngai.kaleida.com)
1.3       jtc       181:         */
1.12      christos  182:        if ((negate = (*pattern == '!' || *pattern == '^')) != 0)
1.11      cgd       183:                ++pattern;
1.7       jtc       184:
1.18      thorpej   185:        for (ok = 0; (c = FOLDCASE(*pattern++, flags)) != ']';) {
1.11      cgd       186:                if (c == '\\' && !(flags & FNM_NOESCAPE))
1.18      thorpej   187:                        c = FOLDCASE(*pattern++, flags);
1.11      cgd       188:                if (c == EOS)
1.7       jtc       189:                        return (NULL);
                    190:                if (*pattern == '-'
1.18      thorpej   191:                    && (c2 = FOLDCASE(*(pattern+1), flags)) != EOS &&
                    192:                        c2 != ']') {
1.7       jtc       193:                        pattern += 2;
1.11      cgd       194:                        if (c2 == '\\' && !(flags & FNM_NOESCAPE))
1.18      thorpej   195:                                c2 = FOLDCASE(*pattern++, flags);
1.11      cgd       196:                        if (c2 == EOS)
1.7       jtc       197:                                return (NULL);
1.11      cgd       198:                        if (c <= test && test <= c2)
1.3       jtc       199:                                ok = 1;
1.11      cgd       200:                } else if (c == test)
1.7       jtc       201:                        ok = 1;
1.3       jtc       202:        }
                    203:        return (ok == negate ? NULL : pattern);
1.1       cgd       204: }

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