perf pmu: Factor out scale conversion code

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 <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170103150833.6694-2-andi@firstfloor.org
[ Keep returning -ENOMEM when strdup() fails in perf_pmu__parse_scale()/convert_scale() ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index dc6ccaa..78b1610 100644 (file)
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -94,32 +94,10 @@ static int pmu_format(const char *name, struct list_head *format)
        return 0;
 }
 
-static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
+static int convert_scale(const char *scale, char **end, double *sval)
 {
-       struct stat st;
-       ssize_t sret;
-       char scale[128];
-       int fd, ret = -1;
-       char path[PATH_MAX];
        char *lc;
-
-       snprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
-
-       fd = open(path, O_RDONLY);
-       if (fd == -1)
-               return -1;
-
-       if (fstat(fd, &st) < 0)
-               goto error;
-
-       sret = read(fd, scale, sizeof(scale)-1);
-       if (sret < 0)
-               goto error;
-
-       if (scale[sret - 1] == '\n')
-               scale[sret - 1] = '\0';
-       else
-               scale[sret] = '\0';
+       int ret = 0;
 
        /*
         * save current locale
@@ -134,7 +112,7 @@ static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *
        lc = strdup(lc);
        if (!lc) {
                ret = -ENOMEM;
-               goto error;
+               goto out;
        }
 
        /*
@@ -144,14 +122,42 @@ static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *
         */
        setlocale(LC_NUMERIC, "C");
 
-       alias->scale = strtod(scale, NULL);
+       *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;
+       ssize_t sret;
+       char scale[128];
+       int fd, ret = -1;
+       char path[PATH_MAX];
+
+       snprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
+
+       fd = open(path, O_RDONLY);
+       if (fd == -1)
+               return -1;
+
+       if (fstat(fd, &st) < 0)
+               goto error;
+
+       sret = read(fd, scale, sizeof(scale)-1);
+       if (sret < 0)
+               goto error;
+
+       if (scale[sret - 1] == '\n')
+               scale[sret - 1] = '\0';
+       else
+               scale[sret] = '\0';
 
-       ret = 0;
+       ret = convert_scale(scale, NULL, &alias->scale);
 error:
        close(fd);
        return ret;