git: 9front

ref: 7bfd5b6e701b9a7c2b9d772820f66cacadc0ded9
dir: /sys/src/libc/port/runestrecpy.c/

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

Rune*
runestrecpy(Rune *s1, Rune *es1, Rune *s2)
{
	if(s1 >= es1)
		return s1;

	while(*s1++ = *s2++){
		if(s1 == es1){
			s1[-1] = '\0';
			break;
		}
	}
	return s1-1;
}