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

5 files changed, 136 insertions, 39 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;
 }
diff --git a/include/xatonum.h b/include/xatonum.h
index 944ee7742..02aacc0d5 100644
--- a/include/xatonum.h
+++ b/include/xatonum.h
@@ -169,7 +169,7 @@ uint32_t bb_strtou32(const char *arg, char **endp, int base)
 
 /* Floating point */
 
-/* double bb_strtod(const char *arg, char **endp); */
+double bb_strtod(const char *arg, char **endp) FAST_FUNC;
 
 #if __GNUC_PREREQ(4,1)
 # pragma GCC visibility pop
diff --git a/libbb/Kbuild b/libbb/Kbuild
index c49297b12..ab85ffc9e 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -13,6 +13,7 @@ lib-y += bb_basename.o
 lib-y += bb_do_delay.o
 lib-y += bb_pwd.o
 lib-y += bb_qsort.o
+lib-y += bb_strtod.o
 lib-y += bb_strtonum.o
 lib-y += change_identity.o
 lib-y += chomp.o
diff --git a/libbb/bb_strtod.c b/libbb/bb_strtod.c
new file mode 100644
index 000000000..0515ff867
--- /dev/null
+++ b/libbb/bb_strtod.c
@@ -0,0 +1,85 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+#include <math.h>  /* just for HUGE_VAL */
+
+#define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
+
+double FAST_FUNC bb_strtod(const char *arg, char **endp)
+{
+	double v;
+	char *endptr;
+
+	if (arg[0] != '-' && NOT_DIGIT(arg[0]))
+		goto err;
+	errno = 0;
+	v = strtod(arg, &endptr);
+	if (endp)
+		*endp = endptr;
+	if (endptr[0]) {
+		/* "1234abcg" or out-of-range? */
+		if (isalnum(endptr[0]) || errno) {
+ err:
+			errno = ERANGE;
+			return HUGE_VAL;
+		}
+		/* good number, just suspicious terminator */
+		errno = EINVAL;
+	}
+	return v;
+}
+
+#if 0
+/* String to timespec: "NNNN[.NNNNN]" -> struct timespec.
+ * Can be used for other fixed-point needs.
+ * Returns pointer past last converted char,
+ * and returns errno similar to bb_strtoXX functions.
+ */
+char* FAST_FUNC bb_str_to_ts(struct timespec *ts, const char *arg)
+{
+	if (sizeof(ts->tv_sec) <= sizeof(int))
+		ts->tv_sec = bb_strtou(arg, &arg, 10);
+	else if (sizeof(ts->tv_sec) <= sizeof(long))
+		ts->tv_sec = bb_strtoul(arg, &arg, 10);
+	else
+		ts->tv_sec = bb_strtoull(arg, &arg, 10);
+	ts->tv_nsec = 0;
+
+	if (*arg != '.')
+		return arg;
+
+	/* !EINVAL: number is not ok (alphanumeric ending, overflow etc) */
+	if (errno != EINVAL)
+		return arg;
+
+	if (!*++arg) /* "NNN." */
+		return arg;
+
+	{ /* "NNN.xxx" - parse xxx */
+		int ndigits;
+		char *p;
+		char buf[10]; /* we never use more than 9 digits */
+
+		/* Need to make a copy to avoid false overflow */
+		safe_strncpy(buf, arg, 10);
+		ts->tv_nsec = bb_strtou(buf, &p, 10);
+		ndigits = p - buf;
+		arg += ndigits;
+		/* normalize to nsec */
+		while (ndigits < 9) {
+			ndigits++;
+			ts->tv_nsec *= 10;
+		}
+		while (isdigit(*arg)) /* skip possible 10th plus digits */
+			arg++;
+	}
+	return arg;
+}
+#endif
diff --git a/libbb/bb_strtonum.c b/libbb/bb_strtonum.c
index 525c830cd..50ed99b4b 100644
--- a/libbb/bb_strtonum.c
+++ b/libbb/bb_strtonum.c
@@ -124,33 +124,3 @@ int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
 	return handle_errors(v, endp, endptr);
 }
 #endif
-
-/* Floating point */
-
-#if 0
-
-#include <math.h>  /* just for HUGE_VAL */
-#define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
-double FAST_FUNC bb_strtod(const char *arg, char **endp)
-{
-	double v;
-	char *endptr;
-
-	if (arg[0] != '-' && NOT_DIGIT(arg[0])) goto err;
-	errno = 0;
-	v = strtod(arg, &endptr);
-	if (endp) *endp = endptr;
-	if (endptr[0]) {
-		/* "1234abcg" or out-of-range? */
-		if (isalnum(endptr[0]) || errno) {
- err:
-			errno = ERANGE;
-			return HUGE_VAL;
-		}
-		/* good number, just suspicious terminator */
-		errno = EINVAL;
-	}
-	return v;
-}
-
-#endif