1/* Copyright (C) 1996-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library 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
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <wchar.h>
20
21#ifdef WMEMCMP
22# define __wmemcmp WMEMCMP
23#endif
24
25int
26__wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n)
27{
28 wchar_t c1;
29 wchar_t c2;
30
31 while (n >= 4)
32 {
33 c1 = s1[0];
34 c2 = s2[0];
35 if (c1 - c2 != 0)
36 return c1 > c2 ? 1 : -1;
37 c1 = s1[1];
38 c2 = s2[1];
39 if (c1 - c2 != 0)
40 return c1 > c2 ? 1 : -1;
41 c1 = s1[2];
42 c2 = s2[2];
43 if (c1 - c2 != 0)
44 return c1 > c2 ? 1 : -1;
45 c1 = s1[3];
46 c2 = s2[3];
47 if (c1 - c2 != 0)
48 return c1 > c2 ? 1 : -1;
49 s1 += 4;
50 s2 += 4;
51 n -= 4;
52 }
53
54 if (n > 0)
55 {
56 c1 = s1[0];
57 c2 = s2[0];
58 if (c1 - c2 != 0)
59 return c1 > c2 ? 1 : -1;
60 ++s1;
61 ++s2;
62 --n;
63 }
64 if (n > 0)
65 {
66 c1 = s1[0];
67 c2 = s2[0];
68 if (c1 - c2 != 0)
69 return c1 > c2 ? 1 : -1;
70 ++s1;
71 ++s2;
72 --n;
73 }
74 if (n > 0)
75 {
76 c1 = s1[0];
77 c2 = s2[0];
78 if (c1 - c2 != 0)
79 return c1 > c2 ? 1 : -1;
80 }
81
82 return 0;
83}
84#ifndef WMEMCMP
85weak_alias (__wmemcmp, wmemcmp)
86#endif
87