Initial commit

1 files changed, 101 insertions, 0 deletions

diff --git a/sys/qpoe/qpgpar.x b/sys/qpoe/qpgpar.x
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+++ b/sys/qpoe/qpgpar.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <syserr.h>
+include <ctype.h>
+include "qpoe.h"
+
+# QP_GETPARAM -- Lookup the named parameter in the symbol table and return
+# a pointer to the scalar parameter value.  A NULL pointer is returned if
+# the parameter exists but does not currently have a value.  The parameter
+# datatype code is returned as the function value.  The pointed to parameter
+# value will be clobbered in the next call, hence should be used promptly.
+# The data element pointed to may be a structure as well as a primitive type.
+
+int procedure qp_getparam (qp, param, o_pp)
+
+pointer qp			#I QPOE descriptor
+char	param[ARB]		#I parameter name
+pointer o_pp			#O pointer to parameter value
+
+int	loc_pval, loc_Mem, ip, ch, elem, sz_elem, fd
+pointer sp, key, fm, pp, op, sym
+double	pval[LEN_PVAL+1]
+data	pp /NULL/
+
+pointer qp_gpsym()
+int	qp_sizeof(), fm_getfd(), qp_ctoi(), read()
+errchk	qp_bind, qp_gpsym, syserrs, fm_getfd, seek, read
+
+begin
+	call smark (sp)
+	call salloc (key, SZ_FNAME, TY_CHAR)
+
+	if (QP_ACTIVE(qp) == NO)
+	    call qp_bind (qp)
+
+	fm = QP_FM(qp)
+
+	# Compute pointer (Memc index) to the static pval buffer.
+	# Make sure that the computed pointer is double aligned.
+
+	if (pp == NULL) {
+	    call zlocva (pval, loc_pval)
+	    call zlocva (Memc, loc_Mem)
+	    pp = (loc_pval+SZ_DOUBLE - loc_Mem) / SZ_DOUBLE * SZ_DOUBLE + 1
+	}
+
+	# Extract the primary parameter name, minus any whitespace and
+	# subscript (e.g., "param[elem]").
+
+	op = key
+	do ip = 1, SZ_FNAME {
+	    ch = param[ip]
+	    if (IS_WHITE(ch))
+		next
+	    else if (ch == '[' || ch == EOS)
+		break
+	    Memc[op] = ch
+	    op = op + 1
+	}
+	Memc[op] = EOS
+
+	# Determine the array element (default [1]).
+	elem = 1
+	if (param[ip] == '[') {
+	    ip = ip + 1
+	    if (qp_ctoi (param, ip, elem) <= 0)
+		elem = 1
+	}
+
+	# Lookup the symbol in the symbol table.
+	sym = qp_gpsym (qp, Memc[key])
+	if (sym == NULL)
+	    call syserrs (SYS_QPUKNPAR, param)
+
+	# Check to make sure the parameter value exists, and fetch the 
+	# value from the lfile where the parameter data is stored, setting
+	# the parameter value pointer to point to the stored value.
+
+	if (elem < 1 || elem > S_NELEM(sym))
+	    o_pp = NULL
+	else {
+	    sz_elem = qp_sizeof (qp, S_DTYPE(sym), sym, INSTANCEOF)
+	    if (sz_elem > LEN_PVAL * SZ_DOUBLE)
+		call syserrs (SYS_QPPVALOVF, QP_DFNAME(qp))
+
+	    fd = fm_getfd (fm, S_LFILE(sym), READ_ONLY, 0)
+
+	    call seek (fd, S_OFFSET(sym) + (elem - 1) * sz_elem)
+	    if (read (fd, Memc[pp], sz_elem) < sz_elem)
+		o_pp = NULL
+	    else if (S_DTYPE(sym) == TY_USER)
+		o_pp = (pp - 1) / SZ_STRUCT + 1
+	    else
+		o_pp = (pp - 1) / sz_elem + 1
+
+	    call fm_retfd (fm, S_LFILE(sym))
+	}
+
+	call sfree (sp)
+	return (S_DTYPE(sym))
+end