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C Language: setbuf function
(Set Buffer)

In the C Programming Language, the setbuf function lets you change the way a stream is buffered and to control the size and location of the buffer. The setbuf function assumes default values for the buffering mode and buffer size.

If buf is not a null pointer, the setbuf function will perform the equivalent to the setvbuf function as:

(void) setvbuf(stream, buf, _IOFBF, BUFSIZ);

If buf is a null pointer, the setbuf function will perform the equivalent to the setvbuf function as:

(void) setvbuf(stream, NULL, _IONBF, 0);

Syntax

The syntax for the setbuf function in the C Language is:

void setbuf(FILE  *stream, char *buf);

Parameters or Arguments

stream

The stream to modify.

buf

A pointer to the desired buffer.

Returns

The setbuf function returns zero if successful or a nonzero value if an error was encountered.

Required Header

In the C Language, the required header for the setbuf function is:

#include <stdio.h>

Applies To

In the C Language, the setbuf function can be used in the following versions:

• ANSI/ISO 9899-1990

Similar Functions

Other C functions that are similar to the setbuf function:

• setvbuf function <stdio.h>

See Also

Other C functions that are noteworthy when dealing with the setbuf function:

• fopen function <stdio.h>
• freopen function <stdio.h>
• fflush function <stdio.h>