1 files changed, 34 insertions, 0 deletions
diff --git a/sys/fmtio/ctor.x b/sys/fmtio/ctor.x
new file mode 100644
index 00000000..a8fd16f1
--- /dev/null
+++ b/sys/fmtio/ctor.x
@@ -0,0 +1,34 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <mach.h>
+
+# CTOR -- Character to real.  The number of characters converted to produce
+# the output number is returned as the function value (0 is returned if the
+# input cannot be interpreted as a number).
+
+int procedure ctor (str, ip, rval)
+
+char	str[ARB]		# input string to be decoded
+int	ip			# first character to be used in string
+real	rval			# decoded real value (output)
+
+double	dval
+int	nchars, expon
+int	ctod()
+
+begin
+	nchars = ctod (str, ip, dval)
+	if (abs(dval) > EPSILOND)
+	    expon = int (log10 (abs(dval)))
+	else
+	    expon = 0
+
+	if (IS_INDEFD(dval))
+	    rval = INDEFR
+	else if (expon > MAX_EXPONENTR)
+	    return (0)
+	else
+	    rval = dval
+	
+	return (nchars)
+end