kc3-lang/gnulib/lib/c-strcasecmp.c

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• Hash : 281b825e
  Author :
  Date : 2018-01-01T00:57:25
  

  maint: Run 'make update-copyright'
  

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• lib/c-strcasecmp.c

• /* c-strcasecmp.c -- case insensitive string comparator in C locale
     Copyright (C) 1998-1999, 2005-2006, 2009-2018 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2, or (at your option)
     any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "c-strcase.h"
  
  #include <limits.h>
  
  #include "c-ctype.h"
  
  int
  c_strcasecmp (const char *s1, const char *s2)
  {
    register const unsigned char *p1 = (const unsigned char *) s1;
    register const unsigned char *p2 = (const unsigned char *) s2;
    unsigned char c1, c2;
  
    if (p1 == p2)
      return 0;
  
    do
      {
        c1 = c_tolower (*p1);
        c2 = c_tolower (*p2);
  
        if (c1 == '\0')
          break;
  
        ++p1;
        ++p2;
      }
    while (c1 == c2);
  
    if (UCHAR_MAX <= INT_MAX)
      return c1 - c2;
    else
      /* On machines where 'char' and 'int' are types of the same size, the
         difference of two 'unsigned char' values - including the sign bit -
         doesn't fit in an 'int'.  */
      return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
  }
  

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