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perf pmu: Factor out scale conversion code

Browse source 
Move the scale factor parsing code to an own function to reuse it in an
upcoming patch.

v2: Return error in case strdup returns NULL.

Signed-off-by: Andi Kleen <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Keep returning -ENOMEM when strdup() fails in perf_pmu__parse_scale()/convert_scale() ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Andi Kleen 2017-01-03 07:08:23 -08:00 • committed by Arnaldo Carvalho de Melo
commit d02fc6bcd5
1 changed files with 34 additions and 28 deletions
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70
tools/perf/util/pmu.c
View file

@ -94,6 +94,43 @@ static int pmu_format(const char *name, struct list_head *format)
return 0;
}
static int convert_scale(const char *scale, char **end, double *sval)
{
char *lc;
int ret = 0;
/*
* save current locale
*/
lc = setlocale(LC_NUMERIC, NULL);
/*
* The lc string may be allocated in static storage,
* so get a dynamic copy to make it survive setlocale
* call below.
*/
lc = strdup(lc);
if (!lc) {
ret = -ENOMEM;
goto out;
}
/*
* force to C locale to ensure kernel
* scale string is converted correctly.
* kernel uses default C locale.
*/
setlocale(LC_NUMERIC, "C");
*sval = strtod(scale, end);
out:
/* restore locale */
setlocale(LC_NUMERIC, lc);
free(lc);
return ret;
}
static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
{
struct stat st;
@ -101,7 +138,6 @@ static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *
char scale[128];
int fd, ret = -1;
char path[PATH_MAX];
char *lc;
snprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
@ -121,37 +157,7 @@ static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *
else
scale[sret] = '\0';
/*
* save current locale
*/
lc = setlocale(LC_NUMERIC, NULL);
/*
* The lc string may be allocated in static storage,
* so get a dynamic copy to make it survive setlocale
* call below.
*/
lc = strdup(lc);
if (!lc) {
ret = -ENOMEM;
goto error;
}
/*
* force to C locale to ensure kernel
* scale string is converted correctly.
* kernel uses default C locale.
*/
setlocale(LC_NUMERIC, "C");
alias->scale = strtod(scale, NULL);
/* restore locale */
setlocale(LC_NUMERIC, lc);
free(lc);
ret = 0;
ret = convert_scale(scale, NULL, &alias->scale);
error:
close(fd);
return ret;