From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 sys/plio/pllnext.x | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 sys/plio/pllnext.x

(limited to 'sys/plio/pllnext.x')

diff --git a/sys/plio/pllnext.x b/sys/plio/pllnext.x
new file mode 100644
index 00000000..43d87c01
--- /dev/null
+++ b/sys/plio/pllnext.x
@@ -0,0 +1,61 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<plio.h>
+include	"pllseg.h"
+
+# PLL_NEXTSEG -- Internal routine called by the PLLSEG.H routines to get the
+# next segment of a line list.
+
+procedure pll_nextseg (ll, ld)
+
+short	ll[ARB]			#I input line list
+int	ld[LEN_PLLDES]		#I list list i/o descriptor
+
+int	ip
+int	opcode, data
+
+begin
+	for (ip = ld_ip(ld);  ip <= LL_LEN(ll);  ip = ld_ip(ld)) {
+	    ld_ip(ld) = ip + 1
+	    opcode = I_OPCODE(ll[ip])
+	    data   = I_DATA(ll[ip])
+
+	    switch (opcode) {
+	    case I_ZN:
+		ld_nleft(ld) = data
+		ld_value(ld) = 0
+		return
+	    case I_HN:
+		ld_nleft(ld) = data
+		ld_value(ld) = ld_hi(ld)
+		return
+	    case I_PN:
+		ld_nleft(ld) = data - 1
+		ld_value(ld) = 0
+		ld_next_nleft(ld) = 1
+		ld_next_value(ld) = ld_hi(ld)
+		return
+
+	    case I_SH:
+		ip = ip + 1
+		ld_ip(ld) = ip + 1
+		ld_hi(ld) = (int(ll[ip]) * I_SHIFT) + data
+	    case I_IH:
+		ld_hi(ld) = ld_hi(ld) + data
+	    case I_DH:
+		ld_hi(ld) = ld_hi(ld) - data
+
+	    case I_IS, I_DS:
+		if (opcode == I_IS)
+		    ld_hi(ld) = ld_hi(ld) + data
+		else
+		    ld_hi(ld) = ld_hi(ld) - data
+
+		ld_nleft(ld) = 1
+		ld_value(ld) = ld_hi(ld)
+		return
+	    }
+	}
+
+	ld_value(ld) = 0
+end
-- 
cgit