[PATCH] perf, tools, stat: Force C numeric locale for CSV mode

[Andi Kleen <andi@firstfloor.org>]

From: Andi Kleen <ak@linux.intel.com>

Some locales print floating point numbers with a comma instead of a dot.
This causes problems with CSV mode because it causes extra false CSV
fields. Force the numeric locale to be always C in CSV mode.

Before:

$ LC_ALL=pl_PL.utf8  perf stat -x, true
0,399472,,task-clock,399472,100,00			<---- extra bogus field
...

After:
$ LC_ALL=pl_PL.utf8  ./obj-perf/perf stat -x, true
0.338422,,task-clock,338422,100.00

Originally reported in https://github.com/andikleen/pmu-tools/issues/43

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/builtin-stat.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 9805e03..4d5e504 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1826,6 +1826,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 		csv_output = true;
 		if (!strcmp(csv_sep, "\\t"))
 			csv_sep = "\t";
+		setlocale(LC_NUMERIC, "C");
 	} else
 		csv_sep = DEFAULT_SEPARATOR;
 
-- 
2.4.3