ack/lang/cem/libcc.ansi/core/string/strncmp.c

/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
/* $Id$ */

#include <string.h>

int strncmp(register const char* s1, register const char* s2, register size_t n)
{
	if (n)
	{
		do
		{
			if (*s1 != *s2++)
				break;
			if (*s1++ == '\0')
				return 0;
		} while (--n > 0);
		if (n > 0)
		{
			if (*s1 == '\0')
				return -1;
			if (*--s2 == '\0')
				return 1;
			return (unsigned char)*s1 - (unsigned char)*s2;
		}
	}
	return 0;
}