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 elements of data, each size
bytes long, from the stream pointed to by stream, storing
them at the location given by ptr.
The function fwrite writes nmemb elements of data, each
size bytes long, to the stream pointed to by stream,
obtaining them from the location given by ptr.
RETURN VALUE
fread and fwrite return the number of items successfully
read or written (i.e., not the number of characters). If
an error occurs, or the end-of-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.
CONFORMING TO
The functions fread and fwrite conform to ANSI X3.159-1989
(``ANSI C'').
SEE ALSO
feof(3), ferror(3), read(2), write(2)
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