1 files changed, 52 insertions, 0 deletions
diff --git a/sys/fmtio/ctol.x b/sys/fmtio/ctol.x
new file mode 100644
index 00000000..a83d1384
--- /dev/null
+++ b/sys/fmtio/ctol.x
@@ -0,0 +1,52 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<ctype.h>
+
+# CTOL -- Simple character to long integer (decimal radix).
+
+int procedure ctol (str, ip, lval)
+
+char	str[ARB]	# decimal encoded numeric string
+int	ip		# starting index in string (input/output)
+long	lval		# decoded integer value (output)
+
+bool	neg
+long	sum
+int	ip_start
+int	strncmp()
+
+begin
+	while (IS_WHITE (str[ip]))
+	    ip = ip + 1
+	ip_start = ip
+
+	# Check for "INDEF".
+	if (str[ip] == 'I')
+	    if (strncmp (str[ip], "INDEF", 5) == 0)
+		if (!IS_ALNUM (str[ip+5])) {
+		    lval = INDEFL
+		    ip = ip + 5
+		    return (5)
+		}
+
+	neg = false
+	if (IS_DIGIT (str[ip+1]))
+	    if (str[ip] == '-') {
+		neg = true
+		ip = ip + 1
+	    } else if (str[ip] == '+')
+		ip = ip + 1
+
+	sum = 0
+	while (IS_DIGIT (str[ip])) {
+	    sum = sum * 10 + TO_INTEG (str[ip])
+	    ip = ip + 1
+	}
+
+	if (neg)
+	    lval = -sum
+	else
+	    lval = sum
+
+	return (ip - ip_start)
+end