From: Namhyung Kim <namhyung....@lge.com>
The parse_nsec_time() function is for parsing a string of time into
64-bit nsec value. It's a preparation of time filtering in some of
perf commands.
Cc: David Ahern <dsah...@gmail.com>
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
tools/perf/util/util.c | 33 +++++++++++++++++++++++++++++++++
tools/perf/util/util.h | 2 ++
2 files changed, 35 insertions(+)
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 59d868add275..205972f6addb 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -269,3 +269,36 @@ void perf_debugfs_set_path(const char *mntpt)
snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt);
set_tracing_events_path(mntpt);
}
+
+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;
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 7a484c97e500..6c8baf312c8a 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -204,6 +204,8 @@ static inline int has_extension(const char *filename, const
char *ext)
#define NSEC_PER_MSEC 1000000L
#endif
+int parse_nsec_time(const char *str, u64 *ptime);
+
extern unsigned char sane_ctype[256];
#define GIT_SPACE 0x01
#define GIT_DIGIT 0x02
--
1.7.11.7
--
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