int segment_get_row(const SEGMENT * SEG, void *buf, int row)
{
int size;
int ncols;
int scols;
int n, index, col;
ncols = SEG->ncols - SEG->spill;
scols = SEG->scols;
size = scols * SEG->len;
for (col = 0; col < ncols; col += scols) {
segment_address(SEG, row, col, &n, &index);
if (segment_seek(SEG, n, index) < 0)
return -1;
if (read(SEG->fd, buf, size) != size) {
G_warning("segment_get_row: %s", strerror(errno));
return -1;
}
/* The buf variable is a void pointer and thus points to anything. */
/* Therefore, it's size is unknown and thus, it cannot be used for */
/* pointer arithmetic (some compilers treat this as an error - SGI */
/* MIPSPro compiler for one). Since the read command is reading in */
/* "size" bytes, cast the buf variable to char * before incrementing */
buf = ((char *)buf) + size;
}
if ((size = SEG->spill * SEG->len)) {
segment_address(SEG, row, col, &n, &index);
if (segment_seek(SEG, n, index) < 0)
return -1;
if (read(SEG->fd, buf, size) != size) {
G_warning("segment_get_row: %s", strerror(errno));
return -1;
}
}
return 1;
}
int segment_get(SEGMENT * SEG, void *buf, int row, int col)
{
int index, n, i;
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;
}
