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perf util: Add parse_nsec_time() function

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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.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: David Ahern <dsahern@gmail.com>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1370310629-9642-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2013-06-04 10:50:29 +09:00 committed by Arnaldo Carvalho de Melo
parent 3223565cdf
commit 3b47abe1b5
2 changed files with 35 additions and 0 deletions
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33
tools/perf/util/util.c
View File

@ -328,3 +328,36 @@ void put_tracing_file(char *file)
{
free(file);
}
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;
}

2
tools/perf/util/util.h
View File

@ -208,6 +208,8 @@ 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