First commit

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 73 insertions, 0 deletions

diff --git a/libpatch_create_timestamp_now.c b/libpatch_create_timestamp_now.c
new file mode 100644
index 0000000..b0bef09
--- /dev/null
+++ b/libpatch_create_timestamp_now.c
@@ -0,0 +1,73 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifdef __linux__
+# include <sys/timex.h>
+#endif
+
+
+size_t
+libpatch_create_timestamp_now(char *buf, size_t bufsize, signed frac, int zone, enum libpatch_style style)
+{
+	struct timespec ts;
+#ifdef __linux__
+	struct timex timex;
+	struct tm tm;
+	int r;
+#endif
+
+	if (frac < 0) {
+		if (clock_gettime(CLOCK_REALTIME, &ts)) {
+			frac = 9;
+		} else {
+			frac = 0;
+			while (ts.tv_nsec < 1000000000L) {
+				ts.tv_nsec *= 10;
+				frac += 1;
+			}
+		}
+	}
+
+#ifdef __linux__
+	memset(&timex, 0, sizeof(timex));
+	if (frac > 6)
+		timex.status = ADJ_NANO;
+	r = adjtimex(&timex);
+	if (r == -1) {
+		if (errno == ENOSYS)
+			goto fallback;
+		return 0;
+	}
+
+	if (timex.time.tv_sec % (24 * 60 * 60) == 0) {
+		if (r == TIME_INS) {
+			timex.time.tv_sec -= 1;
+			if (!localtime_r(&timex.time.tv_sec, &tm))
+				return 0;
+			tm.tm_sec += 1;
+		} else if (r == TIME_DEL) {
+			timex.time.tv_sec += 1;
+			if (!localtime_r(&timex.time.tv_sec, &tm))
+				return 0;
+		} else {
+			if (!localtime_r(&timex.time.tv_sec, &tm))
+				return 0;
+		}
+	} else if (r == TIME_OOP) {
+		if (!localtime_r(&timex.time.tv_sec, &tm))
+			return 0;
+		tm.tm_sec += 1;
+	} else {
+		if (!localtime_r(&timex.time.tv_sec, &tm))
+			return 0;
+	}
+
+	return libpatch_create_timestamp(buf, bufsize, &tm, (uintmax_t)timex.time.tv_usec,
+	                                 frac > 6 ? 9U : 6U, (unsigned)frac, zone, style);
+
+fallback:
+#endif
+
+	if (clock_gettime(CLOCK_REALTIME, &ts))
+		return 0;
+	return libpatch_create_timestamp_ts(buf, bufsize, &ts, (unsigned)frac, zone, style);
+}