ref: 8eae1d47c3534a3ce3902a8895e80dbb4f90375a 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); }