1 files changed, 38 insertions, 0 deletions
diff --git a/contrib/xntpd/lib/hextoint.c b/contrib/xntpd/lib/hextoint.c
new file mode 100644
index 000000000000..90329c4136f4
--- /dev/null
+++ b/contrib/xntpd/lib/hextoint.c
@@ -0,0 +1,38 @@
+/* hextoint.c,v 3.1 1993/07/06 01:08:21 jbj Exp
+ * hextoint - convert an ascii string in hex to an unsigned
+ *	      long, with error checking
+ */
+#include <ctype.h>
+
+#include "ntp_stdlib.h"
+
+int
+hextoint(str, ival)
+	const char *str;
+	U_LONG *ival;
+{
+	register U_LONG u;
+	register const char *cp;
+
+	cp = str;
+
+	if (*cp == '\0')
+		return 0;
+
+	u = 0;
+	while (*cp != '\0') {
+		if (!isxdigit(*cp))
+			return 0;
+		if (u >= 0x10000000)
+			return 0;	/* overflow */
+		u <<= 4;
+		if (*cp <= '9')		/* very ascii dependent */
+			u += *cp++ - '0';
+		else if (*cp >= 'a')
+			u += *cp++ - 'a' + 10;
+		else
+			u += *cp++ - 'A' + 10;
+	}
+	*ival = u;
+	return 1;
+}