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include "od.h"
#---------------------------------------------------------------------------
.help od_open_group 11Jul95 source
.ih
NAME
od_open_group -- Open another "group" of the file
.ih
USAGE
call od_open_group (od, group)
.fi
.ih
ARGUMENTS
.ls od (pointer :input)
The OD I/O descriptor.
.le
.ls group (int :input)
The "group" to open. For tables, this means the column number to open.
.le
.endhelp
#---------------------------------------------------------------------------
procedure od_open_group (od, group)
pointer od # I: The 1D descriptor.
int group # I: The group to open.
# Misc.
real rx # Generic.
errchk gf_opengr, mw_close, od_wcs_open
begin
switch (OD_TYPE(od)) {
case OD_TABLE:
if (group > OD_NGRP(od))
call error (1, "Attempt to open non-existant column")
OD_GRP(od) = group
case OD_IMAGE:
if (group > OD_NGRP(od))
call error (1, "Attempt to open non-existant group")
call mw_close (OD_MW(od))
if (OD_OLD(od) != NULL)
call gf_opengr (OD_FD(od), group, rx, rx, OD_FD(OD_OLD(od)))
else
call gf_opengr (OD_FD(od), group, rx, rx, NULL)
OD_GRP(od) = group
call od_wcs_open (od)
}
end
#---------------------------------------------------------------------------
# End of od_open_group
#---------------------------------------------------------------------------
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