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#include <stdio.h>
#include "segment.h"
/* SEG must have the following parms set
* fd (open for read and write)
* nrows, ncols, srows, scols, len
* nseg
*/
int segment_setup (SEGMENT *SEG)
{
int i;
char *malloc();
SEG->open = 0;
if (SEG->nrows <= 0 || SEG->ncols <= 0
|| SEG->srows <= 0 || SEG->scols <= 0
|| SEG->len <= 0 || SEG->nseg <= 0)
{
G_warning ("segment_setup: illegal segment file parameters\n");
return -1;
}
SEG->offset = lseek (SEG->fd, 0L, 1);
SEG->spr = SEG->ncols / SEG->scols ;
SEG->spill = SEG->ncols % SEG->scols ;
if(SEG->spill)
SEG->spr++ ;
if((SEG->scb =
(struct SEGMENT_SCB *) G_malloc (SEG->nseg * sizeof(struct SEGMENT_SCB))) == NULL)
return -2;
SEG->size = SEG->srows * SEG->scols * SEG->len;
for (i = 0; i < SEG->nseg; i++)
{
if((SEG->scb[i].buf = G_malloc (SEG->size)) == NULL)
return -2;
SEG->scb[i].n = -1; /* mark free */
SEG->scb[i].dirty = 0;
SEG->scb[i].age = 0;
}
SEG->cur = 0;
SEG->open = 1;
return 1;
}
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