NAME
fread, fwrite - binary stream input/output
SYNOPSIS
#include <stdio.h>
size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
size_t fwrite(const void *ptr, size_t size, size_t nmemb,
FILE *stream);
DESCRIPTION
The function fread() reads nmemb items of data, each size bytes long, from the stream pointed to by stream,
storing them at the location given by ptr.
...
RETURN VALUE
On success, fread() and fwrite() return the number of items read or written. This number equals the number of
bytes transferred only when size is 1. If an error occurs, or the end of the file is reached, the return value
is a short item count (or zero).
fread() does not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to
determine which occurred.
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