1 files changed, 29 insertions, 0 deletions
diff --git a/pkg/xtools/ranges/rginrange.x b/pkg/xtools/ranges/rginrange.x
new file mode 100644
index 00000000..7dd946ae
--- /dev/null
+++ b/pkg/xtools/ranges/rginrange.x
@@ -0,0 +1,29 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<pkg/rg.h>
+
+# RG_INRANGE -- Is value in the ranges?
+
+int procedure rg_inrange (rg, rval)
+
+pointer	rg				# Ranges
+int	rval				# Range value to test
+
+int	i
+
+begin
+	# Error check the range pointer.
+
+	if (rg == NULL)
+	    call error (0, "Range descriptor undefined")
+
+	do i = 1, RG_NRGS(rg) {
+	    if ((RG_X1(rg, i) <= RG_X2(rg, i)) && (rval >= RG_X1(rg, i)) &&
+		    (rval <= RG_X2(rg, i)))
+		return (YES)
+	    else if ((rval >= RG_X2(rg, i)) && (rval <= RG_X1(rg, i)))
+		return (YES)
+	}
+
+	return (NO)
+end