1 files changed, 119 insertions, 0 deletions
diff --git a/tools/perf/util/time-utils.c b/tools/perf/util/time-utils.c
new file mode 100644
index 000000000000..d1b21c72206d
--- /dev/null
+++ b/tools/perf/util/time-utils.c
@@ -0,0 +1,119 @@
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <linux/time64.h>
+#include <time.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include "perf.h"
+#include "debug.h"
+#include "time-utils.h"
+
+int parse_nsec_time(const char *str, u64 *ptime)
+{
+	u64 time_sec, time_nsec;
+	char *end;
+
+	time_sec = strtoul(str, &end, 10);
+	if (*end != '.' && *end != '\0')
+		return -1;
+
+	if (*end == '.') {
+		int i;
+		char nsec_buf[10];
+
+		if (strlen(++end) > 9)
+			return -1;
+
+		strncpy(nsec_buf, end, 9);
+		nsec_buf[9] = '\0';
+
+		/* make it nsec precision */
+		for (i = strlen(nsec_buf); i < 9; i++)
+			nsec_buf[i] = '0';
+
+		time_nsec = strtoul(nsec_buf, &end, 10);
+		if (*end != '\0')
+			return -1;
+	} else
+		time_nsec = 0;
+
+	*ptime = time_sec * NSEC_PER_SEC + time_nsec;
+	return 0;
+}
+
+static int parse_timestr_sec_nsec(struct perf_time_interval *ptime,
+				  char *start_str, char *end_str)
+{
+	if (start_str && (*start_str != '\0') &&
+	    (parse_nsec_time(start_str, &ptime->start) != 0)) {
+		return -1;
+	}
+
+	if (end_str && (*end_str != '\0') &&
+	    (parse_nsec_time(end_str, &ptime->end) != 0)) {
+		return -1;
+	}
+
+	return 0;
+}
+
+int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr)
+{
+	char *start_str, *end_str;
+	char *d, *str;
+	int rc = 0;
+
+	if (ostr == NULL || *ostr == '\0')
+		return 0;
+
+	/* copy original string because we need to modify it */
+	str = strdup(ostr);
+	if (str == NULL)
+		return -ENOMEM;
+
+	ptime->start = 0;
+	ptime->end = 0;
+
+	/* str has the format: <start>,<stop>
+	 * variations: <start>,
+	 *             ,<stop>
+	 *             ,
+	 */
+	start_str = str;
+	d = strchr(start_str, ',');
+	if (d) {
+		*d = '\0';
+		++d;
+	}
+	end_str = d;
+
+	rc = parse_timestr_sec_nsec(ptime, start_str, end_str);
+
+	free(str);
+
+	/* make sure end time is after start time if it was given */
+	if (rc == 0 && ptime->end && ptime->end < ptime->start)
+		return -EINVAL;
+
+	pr_debug("start time %" PRIu64 ", ", ptime->start);
+	pr_debug("end time %" PRIu64 "\n", ptime->end);
+
+	return rc;
+}
+
+bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp)
+{
+	/* if time is not set don't drop sample */
+	if (timestamp == 0)
+		return false;
+
+	/* otherwise compare sample time to time window */
+	if ((ptime->start && timestamp < ptime->start) ||
+	    (ptime->end && timestamp > ptime->end)) {
+		return true;
+	}
+
+	return false;
+}