kc3-lang/gnulib/lib/memcasecmp.c

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• Hash : efa15594
  Author :
  Date : 2020-07-22T18:35:20
  

  Optimize three-valued comparison between integers.
  
  (a > b ? 1 : a < b ? -1 : 0) is the same as (a > b) - (a < b).
  
  * m4/gnulib-common.m4 (gl_COMMON): Define _GL_CMP.
  * lib/c-strcasecmp.c (c_strcasecmp): Use _GL_CMP.
  * lib/c-strncasecmp.c (c_strncasecmp): Likewise.
  * lib/dfa.c (compare): Likewise.
  * lib/fts.c (fts_compare_ino): Likewise.
  * lib/mbmemcasecmp.c (mbmemcasecmp): Likewise.
  * lib/mbscasecmp.c (mbscasecmp): Likewise.
  * lib/mbsncasecmp.c (mbsncasecmp): Likewise.
  * lib/memcasecmp.c (memcasecmp): Likewise.
  * lib/memcmp2.c (memcmp2): Likewise.
  * lib/savedir.c (direntry_cmp_inode): Likewise.
  * lib/strcasecmp.c (strcasecmp): Likewise.
  * lib/strncasecmp.c (strncasecmp): Likewise.
  * lib/unistr/u-cmp2.h (FUNC): Likewise.
  

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• lib/memcasecmp.c

• /* Case-insensitive buffer comparator.
     Copyright (C) 1996-1997, 2000, 2003, 2006, 2009-2020 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 3 of the License, 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/>.  */
  
  /* Written by Jim Meyering.  */
  
  #include <config.h>
  
  #include "memcasecmp.h"
  
  #include <ctype.h>
  #include <limits.h>
  
  /* Like memcmp, but ignore differences in case.
     Convert to upper case (not lower) before comparing so that
     join -i works with sort -f.  */
  
  int
  memcasecmp (const void *vs1, const void *vs2, size_t n)
  {
    size_t i;
    char const *s1 = vs1;
    char const *s2 = vs2;
    for (i = 0; i < n; i++)
      {
        unsigned char u1 = s1[i];
        unsigned char u2 = s2[i];
        int U1 = toupper (u1);
        int U2 = toupper (u2);
        int diff = (UCHAR_MAX <= INT_MAX ? U1 - U2 : _GL_CMP (U1, U2));
        if (diff)
          return diff;
      }
    return 0;
  }
  

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