NAME

fread, fwrite − buffered binary input/output

SYNOPSIS

#include <stdio.h>

size_t fread(void ∗ptr, size_t size, size_t nitems, FILE ∗stream)

size_t fwrite(void ∗ptr, size_t size, size_t nitems, FILE ∗stream)

DESCRIPTION

Fread reads, into a block beginning at ptr, nitems of data of the size of size 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(2) to satisfy the fread.

Fwrite appends at most nitems of data of the size of size beginning at ptr to the named output stream. It returns the number of items actually written.

SEE ALSO

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

DIAGNOSTICS

Fread and fwrite return 0 upon end of file or error. 

ANSI C  —  June 23, 1989