segment/try.c

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/****************************************************************************
 *
 * MODULE:       segment
 * AUTHOR(S):    CERL (original contributors)
 *               Markus Neteler <neteler itc.it>, 
 *               Bernhard Reiter <bernhard intevation.de>, 
 *               Brad Douglas <rez touchofmadness.com>, 
 *               Glynn Clements <glynn gclements.plus.com>
 * PURPOSE:      Segment test routines
 * COPYRIGHT:    (C) 1999-2006 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.
 *
 *****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <grass/segment.h>


#define NCOLS 100
#define NROWS 100
#define SROWS 8
#define SCOLS 8
#define LEN   2
#define NSEGS 4


int main(int argc, char **argv)
{
    SEGMENT seg;
    char data[NROWS * NCOLS * LEN];
    int row, col;
    int i;
    int fd;
    char junk[3];

    fprintf(stdout, "creating seg.file\n");
    fd = creat("seg.file", 0666);
    if (fd < 0) {
        perror("seg.file");
        exit(EXIT_FAILURE);
    }
    segment_format(fd, NROWS, NCOLS, SROWS, SCOLS, LEN);
    close(fd);

    fprintf(stdout, "opening seg.file\n");
    fd = open("seg.file", 2);
    if (fd < 0) {
        perror("seg.file");
        exit(EXIT_FAILURE);
    }
    segment_init(&seg, fd, NSEGS);

    fprintf(stdout, "rows %d, cols %d (len %d)\n", seg.nrows, seg.ncols,
            seg.len);
    if (seg.nrows != NROWS || seg.ncols != NCOLS || seg.len != LEN) {
        fprintf(stdout, "OOPS - wrong segment file\n");
        exit(EXIT_FAILURE);
    }

    fprintf(stdout, "writing seg.file\n");
    for (row = 0; row < NROWS; row++) {
        for (col = 0; col < NCOLS; col++) {
            data[col * 2] = row;
            data[col * 2 + 1] = col;
        }
        segment_put_row(&seg, data, row);
    }

    while (1) {
        for (i = 0; i < seg.nseg; i++)
            if (seg.scb[i].n >= 0) {
                fprintf(stdout, "segment %d age %d",
                        seg.scb[i].n, seg.scb[i].age);
                if (i == seg.cur)
                    fprintf(stdout, " current");
                fprintf(stdout, "\n");
            }
        fprintf(stdout, "\nenter row col: ");
        if (!fgets(data, 20, stdin))
            break;
        if (sscanf(data, "%1s", junk) != 1)
            continue;
        if (sscanf(data, "%d%d", &row, &col) != 2)
            fprintf(stdout, "??\n");
        else if (row < 0 || row >= NROWS || col < 0 || col >= NCOLS)
            fprintf(stdout, "bad row/col value(s)\n");
        else {
            segment_get(&seg, data, row, col);
            fprintf(stdout, "data = %d %d\n", data[0], data[1]);
        }
    }

    segment_release(&seg);
    close(fd);

    return 0;
}