toolchain/gcc/newlib/libc/string/wcschr.c

   1 /*
   2 FUNCTION
   3         <<wcschr>>---wide-character string scanning operation
   4
   5 ANSI_SYNOPSIS
   6         #include <wchar.h>
   7         wchar_t *wcschr(const wchar_t *<[s]>, wchar_t <[c]>);
   8
   9 TRAD_SYNOPSIS
  10         wchar_t *wcschr(<[s]>, <[c]>
  11         const wchar_t *<[s]>;
  12         wchar_t <[c]>;
  13
  14 DESCRIPTION
  15         The <<wcschr>> function locates the first occurrence of <[c]> in the
  16         wide-character string pointed to by <[s]>. The value of <[c]> must be a
  17         character representable as a type wchar_t and must be a wide-character
  18         code corresponding to a valid character in the current locale.
  19         The terminating null wide-character string.
  20
  21 RETURNS
  22         Upon completion, <<wcschr>> returns a pointer to the wide-character
  23         code, or a null pointer if the wide-character code is not found.
  24
  25 PORTABILITY
  26 <<wcschr>> is ISO/IEC 9899/AMD1:1995 (ISO C).
  27 No supporting OS subroutines are required.
  28 */
  29
  30 /*      $NetBSD: wcschr.c,v 1.1 2000/12/23 23:14:36 itojun Exp $        */
  31
  32 /*-
  33  * Copyright (c)1999 Citrus Project,
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      citrus Id: wcschr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
  58  */
  59
  60 #include <_ansi.h>
  61 #include <stddef.h>
  62 #include <wchar.h>
  63
  64 wchar_t *
  65 _DEFUN (wcschr, (s, c),
  66         _CONST wchar_t * s _AND
  67         wchar_t c)
  68 {
  69   _CONST wchar_t *p;
  70
  71   p = s;
  72   do
  73     {
  74       if (*p == c)
  75         {
  76           /* LINTED interface specification */
  77           return (wchar_t *) p;
  78         }
  79     } while (*p++);
  80   return NULL;
  81 }