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[glibc.git] / wcsmbs / wmemchr.c
blob5cf18346a03eb7d1a255e5cff2888b087c137fc7
1 /* Copyright (C) 1996, 1997 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.
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.
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.
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. */
20 #include <wchar.h>
22 wchar_t *
23 wmemchr (s, c, n)
24 register const wchar_t *s;
25 register wchar_t c;
26 register size_t n;
28 /* For performance reasons unfold the loop four times. */
29 while (n >= 4)
31 if (s[0] == c)
32 return (wchar_t *) s;
33 if (s[1] == c)
34 return (wchar_t *) &s[1];
35 if (s[2] == c)
36 return (wchar_t *) &s[2];
37 if (s[3] == c)
38 return (wchar_t *) &s[3];
39 s += 4;
40 n -= 4;
43 if (n > 0)
45 if (*s == c)
46 return (wchar_t *) s;
47 ++s;
48 --n;
50 if (n > 0)
52 if (*s == c)
53 return (wchar_t *) s;
54 ++s;
55 --n;
57 if (n > 0)
58 if (*s == c)
59 return (wchar_t *) s;
61 return NULL;