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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include "iis.h"
# IISRD -- Read data from IIS. Reads are packed when can.
# The data is line-flipped.
procedure iisrd (chan, buf, nbytes, offset)
int chan[ARB]
short buf[ARB]
int nbytes
long offset
long off1, off2
int nchars, thing_count, tid, y1, y2, x
int or()
include "iis.com"
begin
# Convert to chars and clip at the top of the display.
off1 = (offset - 1) / SZB_CHAR + 1
off2 = min (IIS_XDIM * IIS_YDIM, (offset + nbytes - 1) / SZB_CHAR) + 1
nchars = off2 - off1
y1 = (off1-1 ) / IIS_XDIM
y2 = (off2-1 - IIS_XDIM) / IIS_XDIM
y2 = max (y1,y2)
# Pack only if start at x=0
x = (off1 - 1) - y1 * IIS_XDIM
if ( x == 0 )
tid = IREAD+PACKED
else
tid = IREAD
# If only a few chars, don't pack...have trouble with count of 1
# and this maeks code same as iiswr.x
if ( nchars < 4 )
tid = IREAD
thing_count = nchars
call iishdr (tid, thing_count, REFRESH,
or (x, ADVXONTC), or (IIS_YDIM-1-y2, ADVYONXOV), iframe, iplane)
if ( tid == IREAD)
call iisio (buf, nbytes)
else
call iispio (buf, y2 - y1 + 1)
end
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