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Annotation of mandoc/compat_strcasestr.c, Revision 1.5

1.5     ! schwarze    1: /*     $Id: compat_strcasestr.c,v 1.4 2014/12/11 09:19:32 schwarze Exp $ */
1.4       schwarze    2: /*     $NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $  */
1.1       schwarze    3:
                      4: /*-
                      5:  * Copyright (c) 1990, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * Chris Torek.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
1.5     ! schwarze   35: #include "config.h"
1.1       schwarze   36:
                     37: #include <sys/types.h>
                     38: #include <ctype.h>
                     39: #include <string.h>
                     40:
                     41: #define        __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
                     42:
                     43: /*
                     44:  * Find the first occurrence of find in s, ignore case.
                     45:  */
                     46: char *
                     47: strcasestr(const char *s, const char *find)
                     48: {
                     49:        char c, sc;
                     50:        size_t len;
                     51:
                     52:        if ((c = *find++) != 0) {
                     53:                c = tolower((unsigned char)c);
                     54:                len = strlen(find);
                     55:                do {
                     56:                        do {
                     57:                                if ((sc = *s++) == 0)
                     58:                                        return (NULL);
                     59:                        } while ((char)tolower((unsigned char)sc) != c);
                     60:                } while (strncasecmp(s, find, len) != 0);
                     61:                s--;
                     62:        }
                     63:        return __UNCONST(s);
                     64: }