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, 85 insertions, 0 deletions

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