ref: eb8459e384b8d2597f51e944c4cfff40480c9fff dir: /lib/c/src/setbuf.c/
#include <stdio.h> #undef setbuf void setbuf(FILE * restrict fp, char * restrict buf) { setvbuf(fp, buf, (buf) ? _IOFBF : _IONBF, BUFSIZ); }