Segment seek routines. More...

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <grass/gis.h>
#include "local_proto.h"

Include dependency graph for segment/seek.c:

Go to the source code of this file.

Macros
#define	SEG_SEEK_FAST(SEG, n, index) ((((off_t) (n)) << (SEG)->sizebits) + (index) + (SEG)->offset)
	Internal use only. More...

#define	SEG_SEEK_SLOW(SEG, n, index) ((off_t) (n) * (SEG)->size + (index) + (SEG)->offset)

Functions
int	seg_seek_fast (const SEGMENT *SEG, int n, int index)

int	seg_seek_slow (const SEGMENT *SEG, int n, int index)

int	seg_seek (const SEGMENT *SEG, int n, int index)

Detailed Description

Segment seek routines.

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

Author: GRASS GIS Development Team

Date: 2005-2009

Definition in file segment/seek.c.

Macro Definition Documentation

◆ SEG_SEEK_FAST

#define SEG_SEEK_FAST	(	SEG,
		n,
		index
	)	((((off_t) (n)) << (SEG)->sizebits) + (index) + (SEG)->offset)

Internal use only.

Seek into a segment.

Parameters

[in,out]	SEG	segment
[in]	n
[in]	index

Returns: 0 on success; -1 if unable to seek

Definition at line 36 of file segment/seek.c.

Referenced by seg_seek_fast().

◆ SEG_SEEK_SLOW

#define SEG_SEEK_SLOW	(	SEG,
		n,
		index
	)	((off_t) (n) * (SEG)->size + (index) + (SEG)->offset)

Definition at line 39 of file segment/seek.c.

Referenced by seg_seek_slow().

Function Documentation

◆ seg_seek()

int seg_seek	(	const SEGMENT *	SEG,
		int	n,
		int	index
	)

Definition at line 62 of file segment/seek.c.

References SEGMENT::seek.

◆ seg_seek_fast()

int seg_seek_fast	(	const SEGMENT *	SEG,
		int	n,
		int	index
	)

Definition at line 42 of file segment/seek.c.

References G_fatal_error(), and SEG_SEEK_FAST.

Referenced by seg_setup().

◆ seg_seek_slow()

int seg_seek_slow	(	const SEGMENT *	SEG,
		int	n,
		int	index
	)

Definition at line 52 of file segment/seek.c.

References G_fatal_error(), and SEG_SEEK_SLOW.