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LETTERsetvbufULETTER Sets the buffer for a file.

Overview
#include <stdio.h>

r = setvbuf(f,buf,mode,size);

int r;
FILE *f;
char *buf;
int mode;
unsigned size;

Portability
ANSI

Description
Sets a data buffer "buf" with the size "size" for the file "f". "mode" is used to describe the way the file should be buffered:
_IOFBF sets full buffering, that is, physical output will only occur when the buffer is full.
_IOLBF sets line buffering, that is, physical output occurs as soon as a linefeed is encountered (or, of course, if the buffer is full).
_IONBF disables buffering at all, that is, physical output will occur immediately at any read or write operation.