[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/libbb/rtc.c b/ap/app/busybox/src/libbb/rtc.c
new file mode 100644
index 0000000..97455e8
--- /dev/null
+++ b/ap/app/busybox/src/libbb/rtc.c
@@ -0,0 +1,83 @@
+/*
+ * Common RTC functions
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+#include "rtc_.h"
+
+#if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
+# define ADJTIME_PATH "/var/lib/hwclock/adjtime"
+#else
+# define ADJTIME_PATH "/etc/adjtime"
+#endif
+
+int FAST_FUNC rtc_adjtime_is_utc(void)
+{
+ int utc = 0;
+ FILE *f = fopen_for_read(ADJTIME_PATH);
+
+ if (f) {
+ char buffer[128];
+
+ while (fgets(buffer, sizeof(buffer), f)) {
+ if (strncmp(buffer, "UTC", 3) == 0) {
+ utc = 1;
+ break;
+ }
+ }
+ fclose(f);
+ }
+
+ return utc;
+}
+
+int FAST_FUNC rtc_xopen(const char **default_rtc, int flags)
+{
+ int rtc;
+
+ if (!*default_rtc) {
+ *default_rtc = "/dev/rtc";
+ rtc = open(*default_rtc, flags);
+ if (rtc >= 0)
+ return rtc;
+ *default_rtc = "/dev/rtc0";
+ rtc = open(*default_rtc, flags);
+ if (rtc >= 0)
+ return rtc;
+ *default_rtc = "/dev/misc/rtc";
+ }
+
+ return xopen(*default_rtc, flags);
+}
+
+void FAST_FUNC rtc_read_tm(struct tm *ptm, int fd)
+{
+ memset(ptm, 0, sizeof(*ptm));
+ xioctl(fd, RTC_RD_TIME, ptm);
+ ptm->tm_isdst = -1; /* "not known" */
+}
+
+time_t FAST_FUNC rtc_tm2time(struct tm *ptm, int utc)
+{
+ char *oldtz = oldtz; /* for compiler */
+ time_t t;
+
+ if (utc) {
+ oldtz = getenv("TZ");
+ putenv((char*)"TZ=UTC0");
+ tzset();
+ }
+
+ t = mktime(ptm);
+
+ if (utc) {
+ unsetenv("TZ");
+ if (oldtz)
+ putenv(oldtz - 3);
+ tzset();
+ }
+
+ return t;
+}