segment/seek.c

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#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <grass/config.h>
#include <grass/gis.h>
#include <grass/segment.h>


int segment_seek(const SEGMENT * SEG, int n, int index)
{
    off_t offset;

    offset = (off_t) n *SEG->size + index + SEG->offset;

    if (lseek(SEG->fd, offset, SEEK_SET) == (off_t) - 1) {
        G_warning("segment_seek: %s", strerror(errno));
        return -1;
    }

    return 0;
}