The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1987, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: head/sys/libkern/strcasecmp.c 148865 2005-08-08 19:38:00Z pjd $
   30  */
   31 
   32 #include <sys/param.h>
   33 #include <sys/ctype.h>
   34 #include <sys/libkern.h>
   35 
   36 int
   37 strcasecmp(const char *s1, const char *s2)
   38 {
   39         const u_char *us1 = (const u_char *)s1, *us2 = (const u_char *)s2;
   40 
   41         while (tolower(*us1) == tolower(*us2)) {
   42                 if (*us1++ == '\0')
   43                         return (0);
   44                 us2++;
   45         }
   46         return (tolower(*us1) - tolower(*us2));
   47 }
   48 
   49 int
   50 strncasecmp(const char *s1, const char *s2, size_t n)
   51 {
   52 
   53         if (n != 0) {
   54                 const u_char *us1 = (const u_char *)s1;
   55                 const u_char *us2 = (const u_char *)s2;
   56 
   57                 do {
   58                         if (tolower(*us1) != tolower(*us2))
   59                                 return (tolower(*us1) - tolower(*us2));
   60                         if (*us1++ == '\0')
   61                                 break;
   62                         us2++;
   63                 } while (--n != 0);
   64         }
   65         return (0);
   66 }

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