newlib/libc/string/wcschr.c

   1 /*
   2 FUNCTION
   3         <<wcschr>>---wide-character string scanning operation
   4
   5 SYNOPSIS
   6         #include <wchar.h>
   7         wchar_t *wcschr(const wchar_t *<[s]>, wchar_t <[c]>);
   8
   9 DESCRIPTION
  10         The <<wcschr>> function locates the first occurrence of <[c]> in the
  11         wide-character string pointed to by <[s]>. The value of <[c]> must be a
  12         character representable as a type wchar_t and must be a wide-character
  13         code corresponding to a valid character in the current locale.
  14         The terminating null wide-character string.
  15
  16 RETURNS
  17         Upon completion, <<wcschr>> returns a pointer to the wide-character
  18         code, or a null pointer if the wide-character code is not found.
  19
  20 PORTABILITY
  21 <<wcschr>> is ISO/IEC 9899/AMD1:1995 (ISO C).
  22
  23 No supporting OS subroutines are required.
  24 */
  25
  26 /*      $NetBSD: wcschr.c,v 1.1 2000/12/23 23:14:36 itojun Exp $        */
  27
  28 /*-
  29  * Copyright (c)1999 Citrus Project,
  30  * All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  *      citrus Id: wcschr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
  54  */
  55
  56 #include <_ansi.h>
  57 #include <stddef.h>
  58 #include <wchar.h>
  59
  60 wchar_t *
  61 wcschr (const wchar_t * s,
  62         wchar_t c)
  63 {
  64   const wchar_t *p;
  65
  66   p = s;
  67   do
  68     {
  69       if (*p == c)
  70         {
  71           /* LINTED interface specification */
  72           return (wchar_t *) p;
  73         }
  74     } while (*p++);
  75   return NULL;
  76 }