1/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <wchar.h>
19
20#ifdef WMEMCMP
21# define __wmemcmp WMEMCMP
22#endif
23
24int
25__wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n)
26{
27 wchar_t c1;
28 wchar_t c2;
29
30 while (n >= 4)
31 {
32 c1 = s1[0];
33 c2 = s2[0];
34 if (c1 - c2 != 0)
35 return c1 > c2 ? 1 : -1;
36 c1 = s1[1];
37 c2 = s2[1];
38 if (c1 - c2 != 0)
39 return c1 > c2 ? 1 : -1;
40 c1 = s1[2];
41 c2 = s2[2];
42 if (c1 - c2 != 0)
43 return c1 > c2 ? 1 : -1;
44 c1 = s1[3];
45 c2 = s2[3];
46 if (c1 - c2 != 0)
47 return c1 > c2 ? 1 : -1;
48 s1 += 4;
49 s2 += 4;
50 n -= 4;
51 }
52
53 if (n > 0)
54 {
55 c1 = s1[0];
56 c2 = s2[0];
57 if (c1 - c2 != 0)
58 return c1 > c2 ? 1 : -1;
59 ++s1;
60 ++s2;
61 --n;
62 }
63 if (n > 0)
64 {
65 c1 = s1[0];
66 c2 = s2[0];
67 if (c1 - c2 != 0)
68 return c1 > c2 ? 1 : -1;
69 ++s1;
70 ++s2;
71 --n;
72 }
73 if (n > 0)
74 {
75 c1 = s1[0];
76 c2 = s2[0];
77 if (c1 - c2 != 0)
78 return c1 > c2 ? 1 : -1;
79 }
80
81 return 0;
82}
83#ifndef WMEMCMP
84weak_alias (__wmemcmp, wmemcmp)
85#endif
86