ref: c7b8a9f86b3e6aecc69448a6aa724938a57c9de2 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); }