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d4697bc9 | 1 | /* Copyright (C) 1995-2014 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 | |
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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 |
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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 RM |
20 | |
21 | ||
22 | /* Compare no more than N characters of S1 and S2, | |
23 | returning less than, equal to or greater than zero | |
6d52618b | 24 | if S1 is lexicographically less than, equal to or |
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25 | greater than S2. */ |
26 | int | |
27 | wcsncmp (s1, s2, n) | |
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28 | const wchar_t *s1; |
29 | const wchar_t *s2; | |
30 | size_t n; | |
a482b5a5 | 31 | { |
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32 | wint_t c1 = L'\0'; |
33 | wint_t c2 = L'\0'; | |
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34 | |
35 | if (n >= 4) | |
36 | { | |
37 | size_t n4 = n >> 2; | |
38 | do | |
39 | { | |
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40 | c1 = (wint_t) *s1++; |
41 | c2 = (wint_t) *s2++; | |
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42 | if (c1 == L'\0' || c1 != c2) |
43 | return c1 - c2; | |
59dd8641 RM |
44 | c1 = (wint_t) *s1++; |
45 | c2 = (wint_t) *s2++; | |
a482b5a5 RM |
46 | if (c1 == L'\0' || c1 != c2) |
47 | return c1 - c2; | |
59dd8641 RM |
48 | c1 = (wint_t) *s1++; |
49 | c2 = (wint_t) *s2++; | |
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50 | if (c1 == L'\0' || c1 != c2) |
51 | return c1 - c2; | |
59dd8641 RM |
52 | c1 = (wint_t) *s1++; |
53 | c2 = (wint_t) *s2++; | |
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54 | if (c1 == L'\0' || c1 != c2) |
55 | return c1 - c2; | |
56 | } while (--n4 > 0); | |
57 | n &= 3; | |
58 | } | |
59 | ||
60 | while (n > 0) | |
61 | { | |
59dd8641 RM |
62 | c1 = (wint_t) *s1++; |
63 | c2 = (wint_t) *s2++; | |
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64 | if (c1 == L'\0' || c1 != c2) |
65 | return c1 - c2; | |
66 | n--; | |
67 | } | |
68 | ||
69 | return c1 - c2; | |
70 | } |