/************************************************************************
*                                                                       *    
*  Copyright Digital Equipment Corporation 1998. All rights reserved.   *
*                                                                       *    
*  Restricted Rights: Use, duplication, or disclosure by the U.S.       *    
*  Government is subject to restrictions as set forth in subparagraph   *    
*  (c) (1) (ii) of DFARS 252.227-7013, or in FAR 52.227-19, or in FAR   *    
*  52.227-14 Alt. III, as applicable.                                   *    
*                                                                       *    
*  This software is proprietary to and embodies the confidential        *    
*  technology of Digital Equipment Corporation. Possession, use, or     *    
*  copying of this software and media is authorized only pursuant to a  *    
*  valid written license from Digital or an authorized sublicensor.     *    
*                                                                       *    
************************************************************************/

/*      wcsspn_example.c        */

#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <string.h>

/* This test sets up 2 strings, buffer and w_string. It then    */
/* uses wcsspn() to calculate the maximum segment of w_string   */
/* that consists entirely of characters from buffer.            */

#define BUFF_SIZE 20
#define STRING_SIZE 50

main()
{
    wchar_t buffer[BUFF_SIZE];
    wchar_t w_string[STRING_SIZE];
    size_t result;

    /* Initialize the buffer */

    if (mbstowcs(buffer, "abcdefg", BUFF_SIZE) == -1) {
        perror("mbstowcs");
        exit(EXIT_FAILURE);
    }

    /* Initialize the string */

    if (mbstowcs(w_string, "abcedjklmabcjklabcdehjkl", STRING_SIZE)
        == -1) {
        perror("mbstowcs");
        exit(EXIT_FAILURE);
    }

    /* Using wcsspn - work out the largest string in w_string that   */
    /* consists entirely of characters from buffer                   */

    result = wcsspn(w_string, buffer);
    printf("Longest segment found in w_string is: %d", result);

}