Plan 9 from Bell Labs’s /usr/web/sources/patch/ape-erik/rerrstr.c
#undef _BSD_EXTENSION #include "../9/libc.h" void rerrstr(char *buf, uint nbuf) { char tmp[ERRMAX]; tmp[0] = 0; errstr(tmp, sizeof tmp); utfecpy(buf, buf+nbuf, tmp); errstr(tmp, sizeof tmp); }