1  /* Compare pieces of UTF-8 strings.
       2     Copyright (C) 2002, 2006, 2009-2023 Free Software Foundation, Inc.
       3     Written by Bruno Haible <bruno@clisp.org>, 2002.
       4  
       5     This file is free software.
       6     It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
       7     You can redistribute it and/or modify it under either
       8       - the terms of the GNU Lesser General Public License as published
       9         by the Free Software Foundation, either version 3, or (at your
      10         option) any later version, or
      11       - the terms of the GNU General Public License as published by the
      12         Free Software Foundation; either version 2, or (at your option)
      13         any later version, or
      14       - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
      15  
      16     This file is distributed in the hope that it will be useful,
      17     but WITHOUT ANY WARRANTY; without even the implied warranty of
      18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      19     Lesser General Public License and the GNU General Public License
      20     for more details.
      21  
      22     You should have received a copy of the GNU Lesser General Public
      23     License and of the GNU General Public License along with this
      24     program.  If not, see <https://www.gnu.org/licenses/>.  */
      25  
      26  #include <config.h>
      27  
      28  /* Specification.  */
      29  #include "unistr.h"
      30  
      31  #include <string.h>
      32  
      33  int
      34  u8_cmp (const uint8_t *s1, const uint8_t *s2, size_t n)
      35  {
      36    /* Use the fact that the UTF-8 encoding preserves lexicographic order.  */
      37    return n == 0 ? 0 : memcmp ((const char *) s1, (const char *) s2, n);
      38  }