segment/debug.c

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


static int check(const SEGMENT *, int, int, char *);


int segment_get(SEGMENT * SEG, void *buf, int row, int col)
{
    int index, n;

    if (!check(SEG, row, col, "segment_get"))
        return -1;

    segment_address(SEG, row, col, &n, &index);
    if ((i = segment_pagein(SEG, n)) < 0)
        return -1;

    memcpy(buf, &SEG->scb[i].buf[index], SEG->len);

    return 1;
}


int segment_put(SEGMENT * SEG, const void *buf, int row, int col)
{
    int index, n;

    if (!check(SEG, row, col, "segment_put"))
        return -1;

    segment_address(SEG, row, col, &n, &index);
    if ((i = segment_pagein(SEG, n)) < 0)
        return -1;

    SEG->scb[i].dirty = 1;

    memcpy(&SEG->scb[i].buf[index], buf, SEG->len);

    return 1;
}


static int check(const SEGMENT * SEG, int row, int col, char *me)
{
    int r = row >= 0 && row < SEG->nrows;
    int c = col >= 0 && col < SEG->ncols;

    if (r && c)
        return 1;

    fprintf(stderr, "%s(SEG=%lx,fd=%d,row=%d,col=%d) ",
            me, (unsigned long int)SEG, SEG->fd, row, col);
    if (!r) {
        fprintf(stderr, "bad row ");
        if (row >= SEG->nrows)
            fprintf(stderr, "(max %d) ", SEG->nrows - 1);
    }
    if (!c) {
        fprintf(stderr, "bad col ");
        if (col >= SEG->ncols)
            fprintf(stderr, "(max %d) ", SEG->ncols - 1);
    }
    fprintf(stderr, "\n");

    return 0;
}