[PATCH iputils v2] ping: always accept . delimiter with -i number parsing

[Mike Frysinger]

Always allow #.# format for the -i flag even when the current locale
uses a different separator.  Locale de_DE which uses #,# normally.

Simple testcase:
$ make USE_IDN=1
$ LANG=de_DE.UTF8 ./ping -i 0.5 localhost
$ LANG=de_DE.UTF8 ./ping -i 0,5 localhost

Reported-by: Sergey Fionov <fio...@gmail.com>
Signed-off-by: Mike Frysinger <vap...@gentoo.org>
---
 ping_common.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/ping_common.c b/ping_common.c
index 62f53a6..6054a91 100644
--- a/ping_common.c
+++ b/ping_common.c
@@ -269,11 +269,28 @@ void common_options(int ch)
                double dbl;
                char *ep;
 
+#ifdef USE_IDN
+               int try_c_loc = 0;
+ retry_c_loc:
+#endif
+
                errno = 0;
                dbl = strtod(optarg, &ep);
 
+#ifdef USE_IDN
+               if (try_c_loc)
+                       setlocale(LC_ALL, "");
+#endif
+
                if (errno || *ep != '\0' ||
                    !finite(dbl) || dbl < 0.0 || dbl >= (double)INT_MAX / 1000 
- 1.0) {
+#ifdef USE_IDN
+                       if (!try_c_loc) {
+                               try_c_loc = 1;
+                               setlocale(LC_ALL, "C");
+                               goto retry_c_loc;
+                       }
+#endif
                        fprintf(stderr, "ping: bad timing interval\n");
                        exit(2);
                }
-- 
2.8.2