#include <stdlib.h>

#include <stdio.h>

#include <wchar.h>

#include <string.h>



/*

 * This test sets up 2 strings, buffer and w_string, and

 * then uses wcscspn() to calculate the maximum segment

 * of w_string, which consists entirely of characters

 * NOT from buffer.

 */



#define BUFF_SIZE 20

#define STRING_SIZE 50



int main(void) {

	wchar_t buffer[BUFF_SIZE];

	wchar_t w_string[STRING_SIZE];

	size_t result;

	

	/* Initialize the buffer */

	if (mbstowcs(buffer, "abcdefg", BUFF_SIZE) == (size_t)-1) {

		perror("mbstowcs");

		exit(-1);

	}

	

	/* Initialize the string */

	if (mbstowcs(w_string, "jklmabcjklabcdehjklmno", STRING_SIZE) == (size_t)-1) {

		perror("mbstowcs");

		exit(-1);

	}

	

	/* Using wcscspn - work out the largest string in w_string */

	/* which consists entirely of characters NOT from buffer   */

	result = wcscspn(w_string, buffer);

	printf("Longest segment NOT found in w_string is: %d", result);

	return (0);

}