timeout,top,watch,ping: parse NN.N fractional duration in locales with other separators

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

coreutils/printf.c

@@ -122,6 +122,7 @@ static void FAST_FUNC conv_strtod(const char *arg, void *result)
 	char *end;
 	/* Well, this one allows leading whitespace... so what? */
 	/* What I like much less is that "-" accepted too! :( */
+//TODO: needs setlocale(LC_NUMERIC, "C")?
 	*(double*)result = strtod(arg, &end);
 	if (end[0]) {
 		errno = ERANGE;

coreutils/sleep.c

@@ -74,10 +74,6 @@ int sleep_main(int argc UNUSED_PARAM, char **argv)
 			sleep(INT_MAX);
 
 #if ENABLE_FEATURE_FANCY_SLEEP
-# if ENABLE_FLOAT_DURATION
-	/* undo busybox.c setlocale */
-	setlocale(LC_NUMERIC, "C");
-# endif
 	duration = 0;
 	do {
 		duration += parse_duration_str(*argv);

coreutils/sort.c

@@ -295,6 +295,7 @@ static int compare_keys(const void *xarg, const void *yarg)
 #if ENABLE_FEATURE_SORT_BIG
 		case FLAG_g: {
 			char *xx, *yy;
+//TODO: needs setlocale(LC_NUMERIC, "C")?
 			double dx = strtod(x, &xx);
 			double dy = strtod(y, &yy);
 			/* not numbers < NaN < -infinity < numbers < +infinity) */