fgetpos
[record position in a stream or file]
SYNOPSIS
#include
<stdio.h>
int fgetpos(FILE
*fp, fpos_t
*pos);
DESCRIPTION
Objects of type, FILE,
can have a position that records how much of the file your program
has already read. Many of the stdio
functions depend on this position,
and many change it as a side effect.
You can use fgetpos to report on the current position for a file identified by fp; fgetpos will write a value representing that position at *pos. Later, you can use this value with fsetpos to return the file to this position.
In the current implementation, fgetpos simply uses a character count to represent the file position; this is the same number that would be returned by ftell.
RETURNS
fgetpos
returns 0
when successful. If fgetpos
fails, the result is 1.
Failure occurs on streams that do not support positioning;
63c
the global,
errno,
indicates this condition with the value,
ESPIPE.
COMPLIANCE
fgetpos
is required by ANSI C, but the meaning
of the value it records is not specified beyond requiring that it be acceptable
as an argument to fsetpos.
In particular, other conforming C implementations may return a different result from ftell than what fgetpos writes at *pos.
No supporting OS subroutines are required.
0