ref: 57446af9a447c3a81414131f2407a9ca6f6a1a94
dir: /libkern/utfecpy.c/
#include "lib9.h" char* utfecpy(char *to, char *e, char *from) { char *end; if(to >= e) return to; end = memccpy(to, from, '\0', e - to); if(end == nil){ end = e; while(end>to && (*--end&0xC0)==0x80) ; *end = '\0'; }else{ end--; } return end; }