libs/port/strncasecmp.c

   1 /*
   2  * strncasecmp function
   3  *
   4  * Copyright 1996 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <ctype.h>
  25
  26 #ifndef HAVE_STRNCASECMP
  27 #undef strncasecmp
  28 int strncasecmp( const char *str1, const char *str2, size_t n )
  29 {
  30     const unsigned char *ustr1 = (const unsigned char *)str1;
  31     const unsigned char *ustr2 = (const unsigned char *)str2;
  32     int res;
  33
  34     if (!n) return 0;
  35     while ((--n > 0) && *ustr1)
  36     {
  37         if ((res = toupper(*ustr1) - toupper(*ustr2))) return res;
  38         ustr1++;
  39         ustr2++;
  40     }
  41     return toupper(*ustr1) - toupper(*ustr2);
  42 }
  43 #endif /* HAVE_STRNCASECMP */