[thirdparty/glibc.git] / wcsmbs / wmemchr.c

/* Copyright (C) 1996-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <wchar.h>

wchar_t *
wmemchr (s, c, n)
     const wchar_t *s;
     wchar_t c;
     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;
}
libc_hidden_def (wmemchr)
Commit	Line	Data
	1	/* Copyright (C) 1996-2015 Free Software Foundation, Inc.
	2	This file is part of the GNU C Library.
	3	Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
	4
	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.
	9
	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.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with the GNU C Library; if not, see
	17	<http://www.gnu.org/licenses/>. */
	18
	19	#include <wchar.h>
	20
	21	wchar_t *
	22	wmemchr (s, c, n)
	23	const wchar_t *s;
	24	wchar_t c;
	25	size_t n;
	26	{
	27	/* For performance reasons unfold the loop four times. */
	28	while (n >= 4)
	29	{
	30	if (s[0] == c)
	31	return (wchar_t *) s;
	32	if (s[1] == c)
	33	return (wchar_t *) &s[1];
	34	if (s[2] == c)
	35	return (wchar_t *) &s[2];
	36	if (s[3] == c)
	37	return (wchar_t *) &s[3];
	38	s += 4;
	39	n -= 4;
	40	}
	41
	42	if (n > 0)
	43	{
	44	if (*s == c)
	45	return (wchar_t *) s;
	46	++s;
	47	--n;
	48	}
	49	if (n > 0)
	50	{
	51	if (*s == c)
	52	return (wchar_t *) s;
	53	++s;
	54	--n;
	55	}
	56	if (n > 0)
	57	if (*s == c)
	58	return (wchar_t *) s;
	59
	60	return NULL;
	61	}
	62	libc_hidden_def (wmemchr)