strcasecmp.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1987, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by the University of
   18  *      California, Berkeley and its contributors.
   19  * 4. 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  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: releng/12.0/sys/libkern/strcasecmp.c 325966 2017-11-18 14:26:50Z pfg $");
   38 
   39 #include <sys/param.h>
   40 #include <sys/ctype.h>
   41 #include <sys/libkern.h>
   42 
   43 int
   44 strcasecmp(const char *s1, const char *s2)
   45 {
   46         const u_char *us1 = (const u_char *)s1, *us2 = (const u_char *)s2;
   47 
   48         while (tolower(*us1) == tolower(*us2)) {
   49                 if (*us1++ == '\0')
   50                         return (0);
   51                 us2++;
   52         }
   53         return (tolower(*us1) - tolower(*us2));
   54 }
   55 
   56 int
   57 strncasecmp(const char *s1, const char *s2, size_t n)
   58 {
   59 
   60         if (n != 0) {
   61                 const u_char *us1 = (const u_char *)s1;
   62                 const u_char *us2 = (const u_char *)s2;
   63 
   64                 do {
   65                         if (tolower(*us1) != tolower(*us2))
   66                                 return (tolower(*us1) - tolower(*us2));
   67                         if (*us1++ == '\0')
   68                                 break;
   69                         us2++;
   70                 } while (--n != 0);
   71         }
   72         return (0);
   73 }

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FreeBSD/Linux Kernel Cross Reference sys/libkern/strcasecmp.c

FreeBSD/Linux Kernel Cross Reference
sys/libkern/strcasecmp.c