#
#include <cvl/cvl.h>
/*
 */

int
seekrow(fd, area, row, whence)

int fd, 			/* Input file descriptor */
    row, 			/* Row to seek to */
    whence;			/* 0 if row is absolute, 1 if an offset */
struct cvl_p *area;

{
	long lseek();
	long offset;		/* offset to be passed to lseek */
	int rowsize;
	
	if ((row > area->cv_rows) || (row < 0)) /* out of picture */
		return (-1);

	rowsize = (area->cv_cols * area->cv_bp + 7) / 8;
	offset = row * rowsize;

	if (whence == 0) 
		offset += sizeof (struct cvl_p) + area->cv_lcom;

	if ((offset = lseek(fd, offset, whence)) == -1)
		return (-1);
	else
		return ((offset-sizeof(struct cvl_p)-area->cv_lcom)/rowsize);
	
}