wcsmbs/wcsncase.c

   1 /* Compare at most N wide characters of two strings without taking care
   2    for the case.
   3    Copyright (C) 1992-2021 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C 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    The GNU C 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 the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <wchar.h>
  25 #include <wctype.h>
  26
  27 #ifndef weak_alias
  28 # define __wcsncasecmp wcsncasecmp
  29 # define TOLOWER(Ch) towlower (Ch)
  30 #else
  31 # ifdef USE_IN_EXTENDED_LOCALE_MODEL
  32 #  define __wcsncasecmp __wcsncasecmp_l
  33 #  define TOLOWER(Ch) __towlower_l ((Ch), loc)
  34 # else
  35 #  define TOLOWER(Ch) towlower (Ch)
  36 # endif
  37 #endif
  38
  39 #ifdef USE_IN_EXTENDED_LOCALE_MODEL
  40 # define LOCALE_PARAM , locale_t loc
  41 #else
  42 # define LOCALE_PARAM
  43 #endif
  44
  45 /* Compare no more than N wide characters of S1 and S2,
  46    ignoring case, returning less than, equal to or
  47    greater than zero if S1 is lexicographically less
  48    than, equal to or greater than S2.  */
  49 int
  50 __wcsncasecmp (const wchar_t *s1, const wchar_t *s2, size_t n LOCALE_PARAM)
  51 {
  52   wint_t c1, c2;
  53
  54   if (s1 == s2 || n == 0)
  55     return 0;
  56
  57   do
  58     {
  59       c1 = (wint_t) TOLOWER (*s1++);
  60       c2 = (wint_t) TOLOWER (*s2++);
  61       if (c1 == L'\0' || c1 != c2)
  62         return c1 - c2;
  63     } while (--n > 0);
  64
  65   return c1 - c2;
  66 }
  67 #ifndef __wcsncasecmp
  68 weak_alias (__wcsncasecmp, wcsncasecmp)
  69 #endif