ref: f16547d604a8fd723f81dc145b4f42532a7fbdc5
dir: /sys/src/libc/port/runestrncat.c/
#include <u.h>
#include <libc.h>
Rune*
runestrncat(Rune *s1, Rune *s2, long n)
{
Rune *os1;
os1 = s1;
s1 = runestrchr(s1, 0);
while(*s1++ = *s2++)
if(--n < 0) {
s1[-1] = 0;
break;
}
return os1;
}