GRASS GIS 8 Programmer's Manual  8.4.0dev(2024)-112dd97adf
segment/init.c File Reference
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <grass/gis.h>
#include "local_proto.h"
Include dependency graph for segment/init.c:

Go to the source code of this file.


int Segment_init (SEGMENT *SEG, int fd, int nseg)
 Initialize segment structure. More...

Function Documentation

◆ Segment_init()

int Segment_init ( SEGMENT SEG,
int  fd,
int  nseg 

Initialize segment structure.

Initializes the seg structure. The file on fd is a segment file created by Segment_format() and must be open for reading and writing. The segment file configuration parameters nrows, ncols, srows, scols, and len, as written to the file by Segment_format(), are read from the file and stored in the seg structure. nsegs specifies the number of segments that will be retained in memory. The minimum value allowed is 1.

Note: The size of a segment is scols*srows*len plus a few bytes for managing each segment.

[in]fdfile descriptor
[in]nsegnumber of segments to remain in memory
1 if successful
-1 if unable to seek or read segment file
-2 if out of memory

Definition at line 56 of file segment/init.c.

References err(), SEGMENT::fd, G_warning(), SEGMENT::nseg, and SEGMENT::open.