1 files changed, 35 insertions, 0 deletions
diff --git a/contrib/ntp/libntp/atouint.c b/contrib/ntp/libntp/atouint.c
new file mode 100644
index 000000000000..c25e3a0c51a7
--- /dev/null
+++ b/contrib/ntp/libntp/atouint.c
@@ -0,0 +1,35 @@
+/*
+ * atouint - convert an ascii string to an unsigned long, with error checking
+ */
+#include <sys/types.h>
+#include <ctype.h>
+
+#include "ntp_types.h"
+#include "ntp_stdlib.h"
+
+int
+atouint(
+	const char *str,
+	u_long *uval
+	)
+{
+	register u_long u;
+	register const char *cp;
+
+	cp = str;
+	if (*cp == '\0')
+	    return 0;
+
+	u = 0;
+	while (*cp != '\0') {
+		if (!isdigit((int)*cp))
+		    return 0;
+		if (u > 429496729 || (u == 429496729 && *cp >= '6'))
+		    return 0;	/* overflow */
+		u = (u << 3) + (u << 1);
+		u += *cp++ - '0';	/* ascii dependent */
+	}
+
+	*uval = u;
+	return 1;
+}