seek.c File Reference

GIS Library - file seek routines. More...

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <grass/gis.h>
#include <grass/glocale.h>

Include dependency graph for gis/seek.c:

Go to the source code of this file.

Functions
off_t	G_ftell (FILE *fp)
	Get the current file position of the stream.
void	G_fseek (FILE *fp, off_t offset, int whence)
	Change the file position of the stream.

Detailed Description

GIS Library - file seek routines.

(C) 2009-2010 by the GRASS Development Team

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author

Glynn Clements

Definition in file gis/seek.c.

Function Documentation

G_fseek()

void G_fseek	(	FILE *	fp,
		off_t	offset,
		int	whence
	)

Change the file position of the stream.

The value of whence must be one of the constants ‘SEEK_SET’, ‘SEEK_CUR’, or ‘SEEK_END’, to indicate whether the offset is relative to the beginning of the file, the current file position, or the end of the file, respectively.

Parameters

fp	file descriptor
offset	offset
whence

Definition at line 50 of file gis/seek.c.

References _, err(), and G_fatal_error().

Referenced by dfread_header(), dfwrite_header(), dig_file_load(), dig_fseek(), G__read_Cell_head(), G_get_element_window(), IL_output_2d(), IL_resample_output_2d(), IL_write_temp_2d(), new_dspf(), open_stream(), Rast__read_colors(), Rast_put_reclass(), read_cube(), reset_reads(), AMI_STREAM< T >::seek(), AMI_STREAM< T >::stream_len(), Vect__open_old(), Vect_hist_copy(), and Vect_open_fidx().

G_ftell()

off_t G_ftell

(

FILE *

fp

)

Get the current file position of the stream.

Parameters

fp	file descriptor

Returns

file position

-1 on failure

Definition at line 29 of file gis/seek.c.

Referenced by dfwrite_header(), dig_ftell(), G_get_element_window(), AMI_STREAM< T >::read_array(), read_cube(), AMI_STREAM< T >::read_item(), AMI_STREAM< T >::stream_len(), Vect_hist_copy(), AMI_STREAM< T >::write_array(), and AMI_STREAM< T >::write_item().