1 files changed, 35 insertions, 0 deletions

diff --git a/contrib/ntp/ntpd/rc_cmdlength.c b/contrib/ntp/ntpd/rc_cmdlength.c
new file mode 100644
index 0000000000000..2807d2acd73e7
--- /dev/null
+++ b/contrib/ntp/ntpd/rc_cmdlength.c
@@ -0,0 +1,35 @@
+#include <config.h>
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+
+/* Bug 2853 */
+/* evaluate the length of the command sequence. This breaks at the first
+ * char that is not >= SPACE and <= 127 after trimming from the right.
+ */
+size_t
+remoteconfig_cmdlength(
+	const char *src_buf,
+	const char *src_end
+	)
+{
+	const char *scan;
+	unsigned char ch;
+
+	/* trim whitespace & garbage from the right */
+	while (src_end != src_buf) {
+		ch = src_end[-1];
+		if (ch > ' ' && ch < 128)
+			break;
+		--src_end;
+	}
+	/* now do a forward scan */
+	for (scan = src_buf; scan != src_end; ++scan) {
+		ch = scan[0];
+		if ((ch < ' ' || ch >= 128) && ch != '\t')
+			break;
+	}
+	return (size_t)(scan - src_buf);
+}