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Annotation of src/lib/libc/gen/fnmatch.c, Revision 1.1

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:
        !            90:                        return(*string == EOS);
        !            91:                case '?':
        !            92:                        if ((test = *string++) == EOS ||
        !            93:                            test == '/' && flags & FNM_PATHNAME)
        !            94:                                return(0);
        !            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)
        !           105:                                        return(!index(string, '/'));
        !           106:                                else
        !           107:                                        return(1);
        !           108:                        else if (c == '/' && flags & FNM_PATHNAME) {
        !           109:                                if ((string = index(string, '/')) == NULL)
        !           110:                                        return(0);
        !           111:                                break;
        !           112:                        }
        !           113:
        !           114:                        /* general case, use recursion */
        !           115:                        while ((test = *string) != EOS) {
        !           116:                                if (fnmatch(pattern, string, flags))
        !           117:                                        return(1);
        !           118:                                if (test == '/' && flags & FNM_PATHNAME)
        !           119:                                        break;
        !           120:                                ++string;
        !           121:                        }
        !           122:                        return(0);
        !           123:                case '[':
        !           124:                        if ((test = *string++) == EOS ||
        !           125:                            test == '/' && flags & FNM_PATHNAME)
        !           126:                                return(0);
        !           127:                        if ((pattern = rangematch(pattern, test)) == NULL)
        !           128:                                return(0);
        !           129:                        break;
        !           130:                case '\\':
        !           131:                        if (flags & FNM_QUOTE) {
        !           132:                                if ((c = *pattern++) == EOS) {
        !           133:                                        c = '\\';
        !           134:                                        --pattern;
        !           135:                                }
        !           136:                                if (c != *string++)
        !           137:                                        return(0);
        !           138:                                break;
        !           139:                        }
        !           140:                        /* FALLTHROUGH */
        !           141:                default:
        !           142:                        if (c != *string++)
        !           143:                                return(0);
        !           144:                        break;
        !           145:                }
        !           146: }