1 files changed, 127 insertions, 0 deletions
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
new file mode 100644
index 0000000..3d28364
--- /dev/null
+++ b/util-linux/hwclock.c
@@ -0,0 +1,127 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini hwclock implementation for busybox
+ *
+ * Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+*/
+
+#include <sys/utsname.h>
+#include "libbb.h"
+#include "rtc_.h"
+
+#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
+# ifndef _GNU_SOURCE
+#  define _GNU_SOURCE
+# endif
+#endif
+
+static const char *rtcname;
+
+static time_t read_rtc(int utc)
+{
+	time_t ret;
+	int fd;
+
+	fd = rtc_xopen(&rtcname, O_RDONLY);
+	ret = rtc_read_time(fd, utc);
+	close(fd);
+
+	return ret;
+}
+
+static void write_rtc(time_t t, int utc)
+{
+	struct tm tm;
+	int rtc = rtc_xopen(&rtcname, O_WRONLY);
+
+	tm = *(utc ? gmtime(&t) : localtime(&t));
+	tm.tm_isdst = 0;
+
+	xioctl(rtc, RTC_SET_TIME, &tm);
+
+	close(rtc);
+}
+
+static void show_clock(int utc)
+{
+	//struct tm *ptm;
+	time_t t;
+	char *cp;
+
+	t = read_rtc(utc);
+	//ptm = localtime(&t);  /* Sets 'tzname[]' */
+
+	cp = ctime(&t);
+	if (cp[0])
+		cp[strlen(cp) - 1] = '\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 void to_sys_clock(int utc)
+{
+	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");
+}
+
+static void from_sys_clock(int utc)
+{
+	struct timeval tv;
+
+	gettimeofday(&tv, NULL);
+	//if (gettimeofday(&tv, NULL))
+	//	bb_perror_msg_and_die("gettimeofday() failed");
+	write_rtc(tv.tv_sec, utc);
+}
+
+#define HWCLOCK_OPT_LOCALTIME   0x01
+#define HWCLOCK_OPT_UTC         0x02
+#define HWCLOCK_OPT_SHOW        0x04
+#define HWCLOCK_OPT_HCTOSYS     0x08
+#define HWCLOCK_OPT_SYSTOHC     0x10
+#define HWCLOCK_OPT_RTCFILE     0x20
+
+int hwclock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int hwclock_main(int argc UNUSED_PARAM, char **argv)
+{
+	unsigned opt;
+	int utc;
+
+#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
+	static const char hwclock_longopts[] ALIGN1 =
+		"localtime\0" No_argument "l"
+		"utc\0"       No_argument "u"
+		"show\0"      No_argument "r"
+		"hctosys\0"   No_argument "s"
+		"systohc\0"   No_argument "w"
+		"file\0"      Required_argument "f"
+		;
+	applet_long_options = hwclock_longopts;
+#endif
+	opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l";
+	opt = getopt32(argv, "lurswf:", &rtcname);
+
+	/* If -u or -l wasn't given check if we are using utc */
+	if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
+		utc = (opt & HWCLOCK_OPT_UTC);
+	else
+		utc = rtc_adjtime_is_utc();
+
+	if (opt & HWCLOCK_OPT_HCTOSYS)
+		to_sys_clock(utc);
+	else if (opt & HWCLOCK_OPT_SYSTOHC)
+		from_sys_clock(utc);
+	else
+		/* default HWCLOCK_OPT_SHOW */
+		show_clock(utc);
+
+	return 0;
+}