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b168057a | 1 | /* Copyright (C) 1995-2015 Free Software Foundation, Inc. |
6d52618b UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. | |
a482b5a5 | 4 | |
6d52618b | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
a482b5a5 | 9 | |
6d52618b UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
a482b5a5 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
a482b5a5 | 18 | |
299a95b9 | 19 | #include <wchar.h> |
a482b5a5 | 20 | |
cee82e70 SL |
21 | #ifndef WCSNCMP |
22 | # define WCSNCMP wcsncmp | |
23 | #endif | |
a482b5a5 RM |
24 | |
25 | /* Compare no more than N characters of S1 and S2, | |
26 | returning less than, equal to or greater than zero | |
6d52618b | 27 | if S1 is lexicographically less than, equal to or |
a482b5a5 RM |
28 | greater than S2. */ |
29 | int | |
9d46370c | 30 | WCSNCMP (const wchar_t *s1, const wchar_t *s2, size_t n) |
a482b5a5 | 31 | { |
920a0395 SL |
32 | wchar_t c1 = L'\0'; |
33 | wchar_t c2 = L'\0'; | |
a482b5a5 RM |
34 | |
35 | if (n >= 4) | |
36 | { | |
37 | size_t n4 = n >> 2; | |
38 | do | |
39 | { | |
920a0395 SL |
40 | c1 = *s1++; |
41 | c2 = *s2++; | |
a482b5a5 | 42 | if (c1 == L'\0' || c1 != c2) |
920a0395 SL |
43 | return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); |
44 | c1 = *s1++; | |
45 | c2 = *s2++; | |
a482b5a5 | 46 | if (c1 == L'\0' || c1 != c2) |
920a0395 SL |
47 | return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); |
48 | c1 = *s1++; | |
49 | c2 = *s2++; | |
a482b5a5 | 50 | if (c1 == L'\0' || c1 != c2) |
920a0395 SL |
51 | return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); |
52 | c1 = *s1++; | |
53 | c2 = *s2++; | |
a482b5a5 | 54 | if (c1 == L'\0' || c1 != c2) |
920a0395 | 55 | return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); |
a482b5a5 RM |
56 | } while (--n4 > 0); |
57 | n &= 3; | |
58 | } | |
59 | ||
60 | while (n > 0) | |
61 | { | |
920a0395 SL |
62 | c1 = *s1++; |
63 | c2 = *s2++; | |
a482b5a5 | 64 | if (c1 == L'\0' || c1 != c2) |
920a0395 | 65 | return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0); |
a482b5a5 RM |
66 | n--; |
67 | } | |
68 | ||
920a0395 | 69 | return 0; |
a482b5a5 | 70 | } |