1 /* Compare 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 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 int
u32_strncmp(const uint32_t * s1,const uint32_t * s2,size_t n)32 u32_strncmp (const uint32_t *s1, const uint32_t *s2, size_t n)
33 {
34 for (; n > 0;)
35 {
36 uint32_t uc1 = *s1++;
37 uint32_t uc2 = *s2++;
38 if (uc1 != 0 && uc1 == uc2)
39 {
40 n--;
41 continue;
42 }
43 /* Note that uc1 and uc2 each have at most 31 bits. */
44 return (int)uc1 - (int)uc2;
45 /* > 0 if uc1 > uc2, < 0 if uc1 < uc2, = 0 if uc1 and uc2 are both 0. */
46 }
47 return 0;
48 }
49