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  1. /*
  2. FUNCTION
  3.         <<wcsrchr>>---wide-character string scanning operation
  4.  
  5. ANSI_SYNOPSIS
  6.         #include <wchar.h>
  7.         wchar_t *wcsrchr(const wchar_t *<[s]>, wchar_t <[c]>);
  8.  
  9. TRAD_SYNOPSIS
  10.         #include <wchar.h>
  11.         wchar_t *wcsrchr(<[s]>, <[c]>
  12.         const wchar_t *<[s]>;
  13.         wchar_t <[c]>;
  14.  
  15. DESCRIPTION
  16.         The <<wcsrchr>> function locates the last occurrence of <[c]> in the
  17.         wide-character string pointed to by <[s]>. The value of <[c]> must be a
  18.         character representable as a type wchar_t and must be a wide-character
  19.         code corresponding to a valid character in the current locale.
  20.         The terminating null wide-character code is considered to be part of
  21.         the wide-character string.
  22.  
  23. RETURNS
  24.         Upon successful completion, <<wcsrchr>> returns a pointer to the
  25.         wide-character code or a null pointer if <[c]> does not occur in the
  26.         wide-character string.
  27.  
  28. PORTABILITY
  29. <<wcsrchr>> is ISO/IEC 9899/AMD1:1995 (ISO C).
  30.  
  31. No supporting OS subroutines are required.
  32. */
  33.  
  34. /*      $NetBSD: wcsrchr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $       */
  35.  
  36. /*-
  37.  * Copyright (c)1999 Citrus Project,
  38.  * All rights reserved.
  39.  *
  40.  * Redistribution and use in source and binary forms, with or without
  41.  * modification, are permitted provided that the following conditions
  42.  * are met:
  43.  * 1. Redistributions of source code must retain the above copyright
  44.  *    notice, this list of conditions and the following disclaimer.
  45.  * 2. Redistributions in binary form must reproduce the above copyright
  46.  *    notice, this list of conditions and the following disclaimer in the
  47.  *    documentation and/or other materials provided with the distribution.
  48.  *
  49.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  50.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  53.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59.  * SUCH DAMAGE.
  60.  *
  61.  *      citrus Id: wcsrchr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
  62.  */
  63.  
  64. #include <_ansi.h>
  65. #include <stddef.h>
  66. #include <wchar.h>
  67.  
  68. wchar_t *
  69. _DEFUN (wcsrchr, (s, c),
  70.         _CONST wchar_t * s _AND
  71.         wchar_t c)
  72. {
  73.   _CONST wchar_t *p;
  74.  
  75.   p = s;
  76.   while (*p)
  77.     p++;
  78.   while (s <= p)
  79.     {
  80.       if (*p == c)
  81.         {
  82.           /* LINTED interface specification */
  83.           return (wchar_t *) p;
  84.         }
  85.       p--;
  86.     }
  87.   return NULL;
  88. }
  89.