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

/***
*wcscspn.c - find length of initial substring of wide characters
*	 not in a control string
*
*	Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
*	defines wcscspn()- finds the length of the initial substring of
*	a string consisting entirely of characters not in a control string
*	(wide-character strings).
*
*Revision History:
*	11-04-91   ETC	Created with source from crtdll.
*	04-07-92   KRS	Updated and ripped out _INTL switches.
*
*******************************************************************************/

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

/***
*size_t wcscspn(string, control) - search for init substring w/o control wchars
*
*Purpose:
*	returns the index of the first character in string that belongs
*	to the set of characters specified by control.	This is equivalent
*	to the length of the length of the initial substring of string
*	composed entirely of characters not in control.  Null chars not
*	considered (wide-character strings).
*
*Entry:
*	wchar_t *string - string to search
*	wchar_t *control - set of characters not allowed in init substring
*
*Exit:
*	returns the index of the first wchar_t in string
*	that is in the set of characters specified by control.
*
*Exceptions:
*
*******************************************************************************/

size_t _CALLTYPE1 wcscspn (
	const wchar_t * string,
	const wchar_t * control
	)
{
        wchar_t *str = (wchar_t *) string;
        wchar_t *wcset;

        /* 1st char in control string stops search */
        while (*str) {
            for (wcset = (wchar_t *)control; *wcset; wcset++) {
                if (*wcset == *str) {
                    return str - string;
                }
            }
            str++;
        }
        return str - string;
}