strncat.c

操作系统源代码

/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
/* $Header: strncat.c,v 1.3 90/08/28 13:53:54 eck Exp $ */

#include	<string.h>

char *
strncat(char *ret, register const char *s2, size_t n)
{
	register char *s1 = ret;

	if (n > 0) {
		while (*s1++)
			/* EMPTY */ ;
		s1--;
		while (*s1++ = *s2++)  {
			if (--n > 0) continue;
			*s1 = '\0';
			break;
		}
		return ret;
	} else return s1;
}