SETBUF(3S) SETBUF(3S)
NAME
setbuf - assign buffering to a stream
SYNOPSIS
#include <stdio.h>
setbuf(stream, buf)
FILE *stream;
char *buf;
DESCRIPTION
Setbuf is used after a stream has been opened but before it
is read or written. It causes the character array buf to be
used instead of an automatically allocated buffer. If buf
is the constant pointer NULL, input/output will be com-
pletely unbuffered.
A manifest constant BUFSIZ tells how big an array is needed:
char buf[BUFSIZ];
A buffer is normally obtained from malloc(3) upon the first
getc or putc(3) on the file, except that output streams
directed to terminals, and the standard error stream stderr
are normally not buffered.
SEE ALSO
fopen(3), getc(3), putc(3), malloc(3)