/* ssequal.c -- check if a string is a substring of another
 *
 * This code is Copyright (c) 2002, by the authors of nmh.  See the
 * COPYRIGHT file in the root directory of the nmh distribution for
 * complete copyright information.
 */

#include <h/mh.h>

/*
 * THIS CODE DOES NOT WORK AS ADVERTISED.
 * It is actually checking if s1 is a PREFIX of s2.
 * All calls to this function need to be checked to see
 * if that needs to be changed. Prefix checking is cheaper, so
 * should be kept if it's sufficient.
 */

/*
 * Check if s1 is a substring of s2.
 * If yes, then return 1, else return 0.
 */

int
ssequal (const char *s1, const char *s2)
{
    if (!s1)
	s1 = "";
    if (!s2)
	s2 = "";

    while (*s1)
	if (*s1++ != *s2++)
	    return 0;
    return 1;
}