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Member "file-5.35/src/strcasestr.c" (11 Sep 2014, 2827 Bytes) of package /linux/misc/file-5.35.tar.gz:


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    1 /*  $NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 1990, 1993
    5  *  The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Chris Torek.
    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. Neither the name of the University nor the names of its contributors
   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 
   35 #if defined(LIBC_SCCS) && !defined(lint)
   36 __RCSID("$NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $");
   37 __RCSID("$NetBSD: strncasecmp.c,v 1.2 2007/06/04 18:19:27 christos Exp $");
   38 #endif /* LIBC_SCCS and not lint */
   39 
   40 #include "file.h"
   41 
   42 #include <assert.h>
   43 #include <ctype.h>
   44 #include <string.h>
   45 
   46 static int
   47 _strncasecmp(const char *s1, const char *s2, size_t n)
   48 {
   49     if (n != 0) {
   50         const unsigned char *us1 = (const unsigned char *)s1,
   51                 *us2 = (const unsigned char *)s2;
   52 
   53         do {
   54             if (tolower(*us1) != tolower(*us2++))
   55                 return tolower(*us1) - tolower(*--us2);
   56             if (*us1++ == '\0')
   57                 break;
   58         } while (--n != 0);
   59     }
   60     return 0;
   61 }
   62 
   63 /*
   64  * Find the first occurrence of find in s, ignore case.
   65  */
   66 char *
   67 strcasestr(const char *s, const char *find)
   68 {
   69     char c, sc;
   70     size_t len;
   71 
   72     if ((c = *find++) != 0) {
   73         c = tolower((unsigned char)c);
   74         len = strlen(find);
   75         do {
   76             do {
   77                 if ((sc = *s++) == 0)
   78                     return (NULL);
   79             } while ((char)tolower((unsigned char)sc) != c);
   80         } while (_strncasecmp(s, find, len) != 0);
   81         s--;
   82     }
   83     return (char *)(intptr_t)(s);
   84 }