NAME

fread, fwrite − buffered binary input/output

SYNTAX

#include <stdio.h>

fread(ptr, sizeof(*ptr), nitems, stream)
char *ptr; unsigned nitems, sizeof(*ptr)
FILE *stream;

fwrite(ptr, sizeof(*ptr), nitems, stream)
char *ptr; unsigned nitems, sizeof(*ptr)
FILE *stream;

DESCRIPTION

The fread function reads into a block beginning at ptr, nitems of data of the type of *ptr from the named input stream. It returns the number of items actually read.

If stream is stdin and the standard output is line buffered, then any partial output line will be flushed before any call to read() to satisfy the fread.

The fwrite function appends, at most, nitems of data of the type of *ptr beginning at ptr to the named output stream. It returns the number of items actually written.

RETURN VALUE

The fread and fwrite functions return 0 upon end of file or error.

SEE ALSO

read(2), write(2), fopen(3s), getc(3s), gets(3s), printf(3s), putc(3s), puts(3s), scanf(3s)

Subroutines