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;
 }