ref: a49ddece8bf3ce16e9049d0cbc5c890c0461f342
dir: /sys/src/cmd/unix/u9fs/strecpy.c/
#include <plan9.h> char* strecpy(char *to, char *e, char *from) { if(to >= e) return to; to = memccpy(to, from, '\0', e - to); if(to == nil){ to = e - 1; *to = '\0'; } return to; }