1 files changed, 67 insertions, 0 deletions
diff --git a/sys/qpoe/qpexopen.x b/sys/qpoe/qpexopen.x
new file mode 100644
index 00000000..833a1461
--- /dev/null
+++ b/sys/qpoe/qpexopen.x
@@ -0,0 +1,67 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<mach.h>
+include	"qpoe.h"
+include	"qpex.h"
+
+# QPEX_OPEN -- Open the expression evaluator.  If an expression is given it
+# is compiled into the descriptor, otherwise a null (pass all) expression
+# is compiled.  The compiled expression may be modified or read out at any
+# time via calls to other routines in the QPEX package (e.g., qpex_modfilter,
+# qpex_getfilter).
+
+pointer procedure qpex_open (qp, expr)
+
+pointer	qp			#I QPOE descriptor
+char	expr[ARB]		#I selection expression (filter) 
+
+pointer	ex, pb, db
+int	pb_len, db_len
+int	qpex_modfilter()
+errchk	calloc
+
+begin
+	# Allocate the main QPEX descriptor.
+	call calloc (ex, LEN_EXDES, TY_STRUCT)
+
+	# Allocate the program buffer.
+	pb_len = QP_EXPBLEN(qp)
+	call calloc (pb, pb_len, TY_INT)
+
+	# Allocate the data buffer.
+	db_len = QP_EXDBLEN(qp)
+	call calloc (db, db_len, TY_CHAR)
+
+	# Initialize the descriptor.
+
+	EX_QP(ex)	= qp
+	EX_DEBUG(ex)	= QP_DEBUG(qp)
+	EX_START(ex)	= pb
+
+	EX_PB(ex)	= pb
+	EX_PBTOP(ex)	= pb + pb_len
+	EX_PBOP(ex)	= pb
+
+	EX_DB(ex)	= db
+	EX_DBTOP(ex)	= db + db_len
+	EX_DBOP(ex)	= db
+
+	EX_MAXFRLUTLEN(ex)  = QP_EXMAXFRLLEN(qp)
+	EX_MAXRRLUTLEN(ex)  = QP_EXMAXRRLLEN(qp)
+	EX_LUTMINRANGES(ex) = QP_EXLMINRANGES(qp)
+	EX_LUTSCALE(ex)     = QP_EXLSCALE(qp)
+
+	if (EX_DEBUG(ex) > 1) {
+	    call eprintf ("QPEX activated, expr = `%s'\n")
+		call pargstr (expr)
+	}
+
+	# If a selection expression was given, compile it into the descriptor.
+	if (qpex_modfilter (ex, expr) == ERR) {
+	    call qpex_close (ex)
+	    call syserrs (SYS_QPEXSYN, QP_DFNAME(qp))
+	}
+
+	return (ex)
+end