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Annotation of src/lib/libc/gen/fnmatch.c, Revision 1.18.2.1

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

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