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. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/9.0/sys/libkern/strcasecmp.c 206360 2010-04-07 16:29:10Z joel $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/ctype.h>
   39 #include <sys/libkern.h>
   40 
   41 int
   42 strcasecmp(const char *s1, const char *s2)
   43 {
   44         const u_char *us1 = (const u_char *)s1, *us2 = (const u_char *)s2;
   45 
   46         while (tolower(*us1) == tolower(*us2)) {
   47                 if (*us1++ == '\0')
   48                         return (0);
   49                 us2++;
   50         }
   51         return (tolower(*us1) - tolower(*us2));
   52 }
   53 
   54 int
   55 strncasecmp(const char *s1, const char *s2, size_t n)
   56 {
   57 
   58         if (n != 0) {
   59                 const u_char *us1 = (const u_char *)s1;
   60                 const u_char *us2 = (const u_char *)s2;
   61 
   62                 do {
   63                         if (tolower(*us1) != tolower(*us2))
   64                                 return (tolower(*us1) - tolower(*us2));
   65                         if (*us1++ == '\0')
   66                                 break;
   67                         us2++;
   68                 } while (--n != 0);
   69         }
   70         return (0);
   71 }

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