ref: 2a03ed80e4fc52c327e47e1749c97b4e2c1aa1d8
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; }