hwclock: size optimizations

libbb/time.c: new file, introducing monotonic_us()
pscan, traceroute, arping: use it instead of gettimeofday
ping, zcip: TODO

function                                             old     new   delta
monotonic_us                                           -      89     +89
find_pair                                            164     180     +16
.rodata                                           129747  129763     +16
refresh                                             1144    1152      +8
............
timeout                                                8       4      -4
static.start                                           8       4      -4
last                                                   8       4      -4
parse_conf                                          1303    1284     -19
time_main                                           1149    1124     -25
gettimeofday_us                                       39       -     -39
arping_main                                         2042    1969     -73
hwclock_main                                         594     501     -93
catcher                                              485     380    -105
traceroute_main                                     4300    4117    -183
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 8/11 up/down: 157/-562)        Total: -405 bytes

1 files changed, 27 insertions, 33 deletions

diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index c4b793ef8..204a103c3 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -7,7 +7,6 @@
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
 
-//#include <sys/ioctl.h>
 #include <sys/utsname.h>
 #include <getopt.h>
 #include "libbb.h"
@@ -98,49 +97,42 @@ static void write_rtc(time_t t, int utc)
 	close(rtc);
 }
 
-static int show_clock(int utc)
+static void show_clock(int utc)
 {
-	struct tm *ptm;
+	//struct tm *ptm;
 	time_t t;
-	RESERVE_CONFIG_BUFFER(buffer, 64);
+	char *cp;
 
 	t = read_rtc(utc);
-	ptm = localtime(&t);  /* Sets 'tzname[]' */
+	//ptm = localtime(&t);  /* Sets 'tzname[]' */
 
-	safe_strncpy(buffer, ctime(&t), 64);
-	if (buffer[0])
-		buffer[strlen(buffer) - 1] = 0;
+	cp = ctime(&t);
+	if (cp[0])
+		cp[strlen(cp) - 1] = '\0';
 
-	//printf("%s  %.6f seconds %s\n", buffer, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
-	printf( "%s  %.6f seconds\n", buffer, 0.0);
-	RELEASE_CONFIG_BUFFER(buffer);
-
-	return 0;
+	//printf("%s  %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
+	printf("%s  0.000000 seconds\n", cp);
 }
 
-static int to_sys_clock(int utc)
+static void to_sys_clock(int utc)
 {
-	struct timeval tv = { 0, 0 };
+	struct timeval tv;
 	const struct timezone tz = { timezone/60 - 60*daylight, 0 };
 
 	tv.tv_sec = read_rtc(utc);
-
+	tv.tv_usec = 0;
 	if (settimeofday(&tv, &tz))
 		bb_perror_msg_and_die("settimeofday() failed");
-
-	return 0;
 }
 
-static int from_sys_clock(int utc)
+static void from_sys_clock(int utc)
 {
-	struct timeval tv = { 0, 0 };
-	struct timezone tz = { 0, 0 };
-
-	if (gettimeofday(&tv, &tz))
-		bb_perror_msg_and_die("gettimeofday() failed");
+	struct timeval tv;
 
+	gettimeofday(&tv, NULL);
+	//if (gettimeofday(&tv, NULL))
+	//	bb_perror_msg_and_die("gettimeofday() failed");
 	write_rtc(tv.tv_sec, utc);
-	return 0;
 }
 
 #ifdef CONFIG_FEATURE_HWCLOCK_ADJTIME_FHS
@@ -182,8 +174,8 @@ static int check_utc(void)
 #define HWCLOCK_OPT_SYSTOHC     0x10
 #define HWCLOCK_OPT_RTCFILE     0x20
 
-int hwclock_main(int argc, char **argv );
-int hwclock_main(int argc, char **argv )
+int hwclock_main(int argc, char **argv);
+int hwclock_main(int argc, char **argv)
 {
 	unsigned opt;
 	int utc;
@@ -210,12 +202,14 @@ int hwclock_main(int argc, char **argv )
 		utc = check_utc();
 
 	if (opt & HWCLOCK_OPT_HCTOSYS) {
-		return to_sys_clock(utc);
+		to_sys_clock(utc);
+		return 0;
 	}
-	else if (opt & HWCLOCK_OPT_SYSTOHC) {
-		return from_sys_clock(utc);
-	} else {
-		/* default HWCLOCK_OPT_SHOW */
-		return show_clock(utc);
+	if (opt & HWCLOCK_OPT_SYSTOHC) {
+		from_sys_clock(utc);
+		return 0;
 	}
+	/* default HWCLOCK_OPT_SHOW */
+	show_clock(utc);
+	return 0;
 }