NAME

fgetpos(), fsetpos() − save and restore a file position indicator for a stream

SYNOPSIS

#include <stdio.h>

int fgetpos(FILE *stream, fpos_t *pos);

int fsetpos(FILE *stream, const fpos_t *pos);

DESCRIPTION

fgetpos() Store the current value of the file position indicator for the stream pointed to by stream in the object pointed to by pos. The value stored contains information usable by fsetpos() for repositioning the stream to its position at the time of the call to fgetpos(). 

fsetpos() Set the file position indicator for the stream pointed to by stream according to the value of the object pointed to by pos, which must be a value set by an earlier call to fgetpos() on the same stream. 

A successful call to fsetpos() clears the end-of-file indicator for the stream and undoes any effects of ungetc(3S) on the same stream. After a fsetpos() call, the next operation on a update stream can be either input or output. 

RETURN VALUE

If successful, these functions return zero; otherwise non-zero. 

ERRORS

If fgetpos() fails, errno is set to one of the following values. 

[EINVAL] The current value of the file position cannot be represented correctly in an object of size fpos_t in this environment. 

Additional errno values may be set by the underlying ftell() function (see ftell(3S)).

WARNINGS

Failure can occur if these functions are used on a file that has not been opened via fopen().  In particular, they must not be used on a terminal or on a file opened via popen(3S).

fsetpos() has no effect on streams that are open for append (see fopen(3S)).

SEE ALSO

fgetpos64(3S), fseek(3S), fsetpos64(3S), fopen(3S), popen(3S), ungetc(3S). 

STANDARDS CONFORMANCE

fgetpos(): AES, SVID3, XPG4, ANSI C

fsetpos(): AES, SVID3, XPG4, ANSI C

Hewlett-Packard Company  —  HP-UX Release 10.20:  July 1996