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-rw-r--r--wcsmbs/wmemchr.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/wcsmbs/wmemchr.c b/wcsmbs/wmemchr.c
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+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include <wchar.h>
+
+wchar_t *
+wmemchr (s, c, n)
+ register const wchar_t *s;
+ register wchar_t c;
+ register size_t n;
+{
+ /* For performance reasons unfold the loop four times. */
+ while (n >= 4)
+ {
+ if (s[0] == c)
+ return (wchar_t *) s;
+ if (s[1] == c)
+ return (wchar_t *) &s[1];
+ if (s[2] == c)
+ return (wchar_t *) &s[2];
+ if (s[3] == c)
+ return (wchar_t *) &s[3];
+ s += 4;
+ n -= 4;
+ }
+
+ if (n > 0)
+ {
+ if (*s == c)
+ return (wchar_t *) s;
+ ++s;
+ --n;
+ }
+ if (n > 0)
+ {
+ if (*s == c)
+ return (wchar_t *) s;
+ ++s;
+ --n;
+ }
+ if (n > 0)
+ if (*s == c)
+ return (wchar_t *) s;
+
+ return NULL;
+}