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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include "qpex.h"
# QPEX_DELETE -- Delete any previously compiled expression terms for the
# event attribute with the given offset and datatype. Only terms up to and
# including ET_LAST are affected (allowing deletion while compiling additional
# terms).
procedure qpex_delete (ex, et_last, offset, dtype)
pointer ex #I QPEX descriptor
pointer et_last #I last expression term to be edited
int offset #I typed offset of attribute in event struct
int dtype #I datatype of attribute
pointer et, ip
int ninstr, i
begin
if (et_last == NULL)
return
for (et=EX_ETHEAD(ex); et != NULL; et=ET_NEXT(et)) {
# Skip over already deleted terms or terms for other attributes.
if (ET_DELETED(et) == YES)
next
else if (ET_ATTOFF(et) != offset || ET_ATTTYPE(et) != dtype)
next
# Physically and logically delete the term. Edit the program
# buffer and replace the compiled sequence of instructions by
# a GOTO followed by a series of NO-OPs.
ip = ET_PROGPTR(et)
ninstr = ET_NINSTR(et)
OPCODE(ip) = GOTO
IARG1(ip) = ip + ninstr * LEN_INSTRUCTION
IARG2(ip) = NULL
IARG3(ip) = NULL
do i = 2, ninstr {
ip = ET_PROGPTR(et) + (i-1) * LEN_INSTRUCTION
OPCODE(ip) = NOP
IARG1(ip) = NULL
IARG2(ip) = NULL
IARG3(ip) = NULL
}
# Flag the eterm as deleted.
ET_DELETED(et) = YES
if (et == et_last)
break
}
end
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