git: 9front

ref: a21c8d0216dc5b89f12975f17c1c5e626aa46eb3
dir: /sys/src/libc/port/strncat.c/

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#include <u.h>
#include <libc.h>

char*
strncat(char *s1, char *s2, long n)
{
	char *os1;

	os1 = s1;
	while(*s1++)
		;
	s1--;
	while(*s1++ = *s2++)
		if(--n < 0) {
			s1[-1] = 0;
			break;
		}
	return os1;
}