ref: 4eaac6bfb11cc84259e8b418d4babffdf1c637eb dir: /lib/c/stdio/setbuf.c/
#include <stdio.h> #undef setbuf void setbuf(FILE * restrict fp, char * restrict buf) { setvbuf(fp, buf, (buf) ? _IOFBF : _IONBF, BUFSIZ); }