rowio/setup.c

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


int rowio_setup(ROWIO * R,
                int fd, int nrows, int len,
                int (*getrow) (int, void *, int, int),
                int (*putrow) (int, const void *, int, int))
{
    int i;

    R->getrow = getrow;
    R->putrow = putrow;
    R->nrows = nrows;
    R->len = len;
    R->cur = -1;
    R->buf = NULL;
    R->fd = fd;

    R->rcb = (struct ROWIO_RCB *)malloc(nrows * sizeof(struct ROWIO_RCB));
    if (R->rcb == NULL) {
        fprintf(stderr, "rowio_setup: out of memory\n");
        return -1;
    }
    for (i = 0; i < nrows; i++) {
        R->rcb[i].buf = malloc(len);
        if (R->rcb[i].buf == NULL) {
            fprintf(stderr, "rowio_setup: out of memory\n");
            return -1;
        }
        R->rcb[i].row = -1;     /* mark not used */
    }
    return 1;
}