1 files changed, 106 insertions, 0 deletions

diff --git a/libntp/buftvtots.c b/libntp/buftvtots.c
new file mode 100644
index 0000000000000..19442336141be
--- /dev/null
+++ b/libntp/buftvtots.c
@@ -0,0 +1,106 @@
+/*
+ * buftvtots - pull a Unix-format (struct timeval) time stamp out of
+ *	       an octet stream and convert it to a l_fp time stamp.
+ *	       This is useful when using the clock line discipline.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "ntp_fp.h"
+#include "ntp_unixtime.h"
+
+int
+buftvtots(
+	const char *bufp,
+	l_fp *ts
+	)
+{
+	register const u_char *bp;
+	register u_long sec;
+	register u_long usec;
+	struct timeval tv;
+
+#ifdef WORDS_BIGENDIAN
+	bp = (const u_char *)bufp;
+
+	sec = (u_long)*bp++ & 0xff;
+	sec <<= 8;
+	sec += (u_long)*bp++ & 0xff;
+	sec <<= 8;
+	sec += (u_long)*bp++ & 0xff;
+	sec <<= 8;
+	sec += (u_long)*bp++ & 0xff;
+
+	if (sizeof(tv.tv_sec) == 8) {
+		sec += (u_long)*bp++ & 0xff;
+		sec <<= 8;
+		sec += (u_long)*bp++ & 0xff;
+		sec <<= 8;
+		sec += (u_long)*bp++ & 0xff;
+		sec <<= 8;
+		sec += (u_long)*bp++ & 0xff;
+	}
+
+	usec = (u_long)*bp++ & 0xff;
+	usec <<= 8;
+	usec += (u_long)*bp++ & 0xff;
+	usec <<= 8;
+	usec += (u_long)*bp++ & 0xff;
+	usec <<= 8;
+	usec += (u_long)*bp++ & 0xff;
+
+	if (sizeof(tv.tv_usec) == 8) {
+		usec += (u_long)*bp++ & 0xff;
+		usec <<= 8;
+		usec += (u_long)*bp++ & 0xff;
+		usec <<= 8;
+		usec += (u_long)*bp++ & 0xff;
+		usec <<= 8;
+		usec += (u_long)*bp & 0xff;
+	}
+#else
+	bp = (const u_char *)bufp + 7;
+
+	usec = (u_long)*bp-- & 0xff;
+	usec <<= 8;
+	usec += (u_long)*bp-- & 0xff;
+	usec <<= 8;
+	usec += (u_long)*bp-- & 0xff;
+	usec <<= 8;
+	usec += (u_long)*bp-- & 0xff;
+
+	if (sizeof(tv.tv_usec) == 8) {
+		usec += (u_long)*bp-- & 0xff;
+		usec <<= 8;
+		usec += (u_long)*bp-- & 0xff;
+		usec <<= 8;
+		usec += (u_long)*bp-- & 0xff;
+		usec <<= 8;
+		usec += (u_long)*bp-- & 0xff;
+	}
+
+	sec = (u_long)*bp-- & 0xff;
+	sec <<= 8;
+	sec += (u_long)*bp-- & 0xff;
+	sec <<= 8;
+	sec += (u_long)*bp-- & 0xff;
+	sec <<= 8;
+	sec += (u_long)*bp-- & 0xff;
+
+	if (sizeof (tv.tv_sec) == 8) {
+		sec += (u_long)*bp-- & 0xff;
+		sec <<= 8;
+		sec += (u_long)*bp-- & 0xff;
+		sec <<= 8;
+		sec += (u_long)*bp-- & 0xff;
+		sec <<= 8;
+		sec += (u_long)*bp & 0xff;
+	}
+#endif
+	ts->l_ui = sec + (u_long)JAN_1970;
+	if (usec > 999999)
+	    return 0;
+	TVUTOTSF(usec, ts->l_uf);
+	return 1;
+}