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299a95b9 | 1 | /* Copyright (C) 1995, 1996 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 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
a482b5a5 | 19 | |
299a95b9 | 20 | #include <wchar.h> |
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21 | |
22 | ||
23 | /* Compare no more than N characters of S1 and S2, | |
24 | returning less than, equal to or greater than zero | |
6d52618b | 25 | if S1 is lexicographically less than, equal to or |
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26 | greater than S2. */ |
27 | int | |
28 | wcsncmp (s1, s2, n) | |
299a95b9 RM |
29 | const wchar_t *s1; |
30 | const wchar_t *s2; | |
31 | size_t n; | |
a482b5a5 | 32 | { |
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33 | wint_t c1 = L'\0'; |
34 | wint_t c2 = L'\0'; | |
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35 | |
36 | if (n >= 4) | |
37 | { | |
38 | size_t n4 = n >> 2; | |
39 | do | |
40 | { | |
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41 | c1 = (wint_t) *s1++; |
42 | c2 = (wint_t) *s2++; | |
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43 | if (c1 == L'\0' || c1 != c2) |
44 | return c1 - c2; | |
59dd8641 RM |
45 | c1 = (wint_t) *s1++; |
46 | c2 = (wint_t) *s2++; | |
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47 | if (c1 == L'\0' || c1 != c2) |
48 | return c1 - c2; | |
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49 | c1 = (wint_t) *s1++; |
50 | c2 = (wint_t) *s2++; | |
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51 | if (c1 == L'\0' || c1 != c2) |
52 | return c1 - c2; | |
59dd8641 RM |
53 | c1 = (wint_t) *s1++; |
54 | c2 = (wint_t) *s2++; | |
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55 | if (c1 == L'\0' || c1 != c2) |
56 | return c1 - c2; | |
57 | } while (--n4 > 0); | |
58 | n &= 3; | |
59 | } | |
60 | ||
61 | while (n > 0) | |
62 | { | |
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63 | c1 = (wint_t) *s1++; |
64 | c2 = (wint_t) *s2++; | |
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65 | if (c1 == L'\0' || c1 != c2) |
66 | return c1 - c2; | |
67 | n--; | |
68 | } | |
69 | ||
70 | return c1 - c2; | |
71 | } |