Re: [PATCH v2 1/4] perf util: Add parse_nsec_time() function

[Namhyung Kim]

Hi Arnaldo,

Could you pick these up or give a comment?

Thanks,
Namhyung


On Mon,  3 Jun 2013 13:44:10 +0900, Namhyung Kim wrote:
> From: Namhyung Kim <namhyung.kim@xxxxxxx>
>
> 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 <dsahern@xxxxxxxxx>
> Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
> ---
>  tools/perf/util/util.c | 30 ++++++++++++++++++++++++++++++
>  tools/perf/util/util.h |  2 ++
>  2 files changed, 32 insertions(+)
>
> diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> index 59d868add275..4a207c40d7bc 100644
> --- a/tools/perf/util/util.c
> +++ b/tools/perf/util/util.c
> @@ -269,3 +269,33 @@ 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];
> +
> +		strncpy(nsec_buf, end + 1, 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
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