path: root/private/crt32/string/wcsrchr.c

/***
*wcsrchr.c - find last occurrence of wchar_t character in wide string
*
*	Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
*	defines wcsrchr() - find the last occurrence of a given character
*	in a string (wide-characters).
*
*Revision History:
*	09-09-91   ETC	Created from strrchr.c.
*	04-07-92   KRS	Updated and ripped out _INTL switches.
*
*******************************************************************************/

#include <cruntime.h>
#include <string.h>

/***
*wchar_t *wcsrchr(string, ch) - find last occurrence of ch in wide string
*
*Purpose:
*	Finds the last occurrence of ch in string.  The terminating
*	null character is used as part of the search (wide-characters).
*
*Entry:
*	wchar_t *string - string to search in
*	wchar_t ch - character to search for
*
*Exit:
*	returns a pointer to the last occurrence of ch in the given
*	string
*	returns NULL if ch does not occurr in the string
*
*Exceptions:
*
*******************************************************************************/

wchar_t * _CALLTYPE1 wcsrchr (
	const wchar_t * string,
	wchar_t ch
	)
{
	wchar_t *start = (wchar_t *)string;

	while (*string++)			/* find end of string */
		;
						/* search towards front */
	while (--string != start && *string != (wchar_t)ch)
		;

	if (*string == (wchar_t)ch)		/* wchar_t found ? */
		return( (wchar_t *)string );

	return(NULL);
}