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) */

libbb/duration.c

@@ -37,8 +37,18 @@ duration_t FAST_FUNC parse_duration_str(char *str)
 	if (strchr(str, '.')) {
 		double d;
 		char *pp;
-		int len = strspn(str, "0123456789.");
-		char sv = str[len];
+		int len;
+		char sv;
+
+# if ENABLE_LOCALE_SUPPORT
+		/* Undo busybox.c: on input, we want to use dot
+		 * as fractional separator in strtod(),
+		 * regardless of current locale
+		 */
+		setlocale(LC_NUMERIC, "C");
+# endif
+		len = strspn(str, "0123456789.");
+		sv = str[len];
 		str[len] = '\0';
 		errno = 0;
 		d = strtod(str, &pp);

miscutils/dc.c

@@ -229,6 +229,7 @@ static void stack_machine(const char *argument)
 	const struct op *o;
 
  next:
+//TODO: needs setlocale(LC_NUMERIC, "C")?
 	number = strtod(argument, &end);
 	if (end != argument) {
 		argument = end;

networking/brctl.c

@@ -89,6 +89,7 @@ static unsigned str_to_jiffies(const char *time_str)
 {
 	double dd;
 	char *endptr;
+//TODO: needs setlocale(LC_NUMERIC, "C")?
 	dd = /*bb_*/strtod(time_str, &endptr);
 	if (endptr == time_str || dd < 0)
 		bb_error_msg_and_die(bb_msg_invalid_arg_to, time_str, "timespec");