lib/unistr/u32-cmp.c

   1 /* Compare pieces of UTF-32 strings.
   2    Copyright (C) 1999, 2002, 2006, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "unistr.h"
  22
  23 int
  24 u32_cmp (const uint32_t *s1, const uint32_t *s2, size_t n)
  25 {
  26   for (; n > 0;)
  27     {
  28       uint32_t uc1 = *s1++;
  29       uint32_t uc2 = *s2++;
  30       if (uc1 == uc2)
  31         {
  32           n--;
  33           continue;
  34         }
  35       /* Note that uc1 and uc2 each have at most 31 bits. */
  36       return (int)uc1 - (int)uc2;
  37       /* > 0 if uc1 > uc2, < 0 if uc1 < uc2. */
  38     }
  39   return 0;
  40 }