sleep: if FANCY && DESKTOP, support fractional seconds, minutes,

 hours and so on. It's coreutils compat. bloatcheck is atrocious :(

function                                             old     new   delta
sleep_main                                            71     362    +291
bb_strtod                                              -     127    +127
make_device                                         1269    1294     +25
getoptscmd                                           708     713      +5
switch_root_main                                     402     401      -1
display_speed                                         90      85      -5
show_entry                                           295     289      -6
parse_expr                                           841     833      -8
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 3/4 up/down: 448/-20)           Total: 428 bytes

1 files changed, 49 insertions, 8 deletions

diff --git a/coreutils/sleep.c b/coreutils/sleep.c
index 162d82006..93b178d76 100644
--- a/coreutils/sleep.c
+++ b/coreutils/sleep.c
@@ -36,28 +36,69 @@ static const struct suffix_mult sfx[] = {
 int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int sleep_main(int argc UNUSED_PARAM, char **argv)
 {
+#if ENABLE_FEATURE_FANCY_SLEEP && ENABLE_DESKTOP
+	double duration;
+	struct timespec ts;
+#else
 	unsigned duration;
+#endif
 
 	++argv;
 	if (!*argv)
 		bb_show_usage();
 
-#if ENABLE_FEATURE_FANCY_SLEEP
+#if ENABLE_FEATURE_FANCY_SLEEP && ENABLE_DESKTOP
 
 	duration = 0;
 	do {
-		duration += xatoul_range_sfx(*argv, 0, UINT_MAX-duration, sfx);
+		char *arg = *argv;
+		if (strchr(arg, '.')) {
+			double d;
+			int len = strspn(arg, "0123456789.");
+			char sv = arg[len];
+			arg[len] = '\0';
+			d = bb_strtod(arg, NULL);
+			if (errno)
+				bb_show_usage();
+			arg[len] = sv;
+			len--;
+			sv = arg[len];
+			arg[len] = '1';
+			duration += d * xatoul_sfx(&arg[len], sfx);
+			arg[len] = sv;
+		} else
+			duration += xatoul_sfx(arg, sfx);
 	} while (*++argv);
 
-#else  /* FEATURE_FANCY_SLEEP */
+	ts.tv_sec = MAXINT(typeof(ts.tv_sec));
+	ts.tv_nsec = 0;
+	if (duration >= 0 && duration < ts.tv_sec) {
+		ts.tv_sec = duration;
+		ts.tv_nsec = (duration - ts.tv_sec) * 1000000000;
+	}
+	do {
+		errno = 0;
+		nanosleep(&ts, &ts);
+	} while (errno == EINTR);
 
-	duration = xatou(*argv);
+#elif ENABLE_FEATURE_FANCY_SLEEP
 
-#endif /* FEATURE_FANCY_SLEEP */
+	duration = 0;
+	do {
+		duration += xatou_range_sfx(*argv, 0, UINT_MAX - duration, sfx);
+	} while (*++argv);
+	sleep(duration);
 
-	if (sleep(duration)) {
-		bb_perror_nomsg_and_die();
-	}
+#else /* simple */
+
+	duration = xatou(*argv);
+	sleep(duration);
+	// Off. If it's really needed, provide example why
+	//if (sleep(duration)) {
+	//	bb_perror_nomsg_and_die();
+	//}
+
+#endif
 
 	return EXIT_SUCCESS;
 }