split some rtc funcs out of hwclock and into an rtc header/lib so that the new rtcwake applet as well as hwclock can utilize the same code

1 files changed, 16 insertions, 99 deletions

diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index f91379bed..b581d2604 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -10,22 +10,7 @@
 #include <sys/utsname.h>
 #include <getopt.h>
 #include "libbb.h"
-
-/* Copied from linux/rtc.h to eliminate the kernel dependency */
-struct linux_rtc_time {
-        int tm_sec;
-        int tm_min;
-        int tm_hour;
-        int tm_mday;
-        int tm_mon;
-        int tm_year;
-        int tm_wday;
-        int tm_yday;
-        int tm_isdst;
-};
-
-#define RTC_SET_TIME   _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time    */
-#define RTC_RD_TIME    _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time   */
+#include "rtc_.h"
 
 #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
 # ifndef _GNU_SOURCE
@@ -35,56 +20,22 @@ struct linux_rtc_time {
 
 static const char *rtcname;
 
-static int xopen_rtc(int flags)
-{
-        int rtc;
-
-        if (!rtcname) {
-                rtc = open("/dev/rtc", flags);
-                if (rtc >= 0)
-                        return rtc;
-                rtc = open("/dev/rtc0", flags);
-                if (rtc >= 0)
-                        return rtc;
-                rtcname = "/dev/misc/rtc";
-        }
-        return xopen(rtcname, flags);
-}
-
 static time_t read_rtc(int utc)
 {
-        struct tm tm;
-        char *oldtz = 0;
-        time_t t = 0;
-        int rtc = xopen_rtc(O_RDONLY);
+        time_t ret;
+        int fd;
 
-        memset(&tm, 0, sizeof(struct tm));
-        xioctl(rtc, RTC_RD_TIME, &tm);
-        tm.tm_isdst = -1; /* not known */
+        fd = rtc_xopen(rtcname, O_RDONLY);
+        ret = rtc_read_time(fd, utc);
+        close(fd);
 
-        close(rtc);
-
-        if (utc) {
-                oldtz = getenv("TZ");
-                putenv((char*)"TZ=UTC0");
-                tzset();
-        }
-
-        t = mktime(&tm);
-
-        if (utc) {
-                unsetenv("TZ");
-                if (oldtz)
-                        putenv(oldtz - 3);
-                tzset();
-        }
-        return t;
+        return ret;
 }
 
 static void write_rtc(time_t t, int utc)
 {
         struct tm tm;
-        int rtc = xopen_rtc(O_WRONLY);
+        int rtc = rtc_xopen(rtcname, O_WRONLY);
 
         tm = *(utc ? gmtime(&t) : localtime(&t));
         tm.tm_isdst = 0;
@@ -132,38 +83,6 @@ static void from_sys_clock(int utc)
         write_rtc(tv.tv_sec, utc);
 }
 
-#if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
-# define ADJTIME_PATH "/var/lib/hwclock/adjtime"
-#else
-# define ADJTIME_PATH "/etc/adjtime"
-#endif
-static int check_utc(void)
-{
-        int utc = 0;
-        FILE *f = fopen(ADJTIME_PATH, "r");
-
-        if (f) {
-                RESERVE_CONFIG_BUFFER(buffer, 128);
-
-                while (fgets(buffer, sizeof(buffer), f)) {
-                        int len = strlen(buffer);
-
-                        while (len && isspace(buffer[len - 1]))
-                                len--;
-
-                        buffer[len] = 0;
-
-                        if (strncmp(buffer, "UTC", 3) == 0) {
-                                utc = 1;
-                                break;
-                        }
-                }
-                fclose(f);
-                RELEASE_CONFIG_BUFFER(buffer);
-        }
-        return utc;
-}
-
 #define HWCLOCK_OPT_LOCALTIME   0x01
 #define HWCLOCK_OPT_UTC         0x02
 #define HWCLOCK_OPT_SHOW        0x04
@@ -193,19 +112,17 @@ int hwclock_main(int argc, char **argv)
 
         /* 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;
+                utc = (opt & HWCLOCK_OPT_UTC);
         else
-                utc = check_utc();
+                utc = rtc_adjtime_is_utc();
 
-        if (opt & HWCLOCK_OPT_HCTOSYS) {
+        if (opt & HWCLOCK_OPT_HCTOSYS)
                 to_sys_clock(utc);
-                return 0;
-        }
-        if (opt & HWCLOCK_OPT_SYSTOHC) {
+        else if (opt & HWCLOCK_OPT_SYSTOHC)
                 from_sys_clock(utc);
-                return 0;
-        }
-        /* default HWCLOCK_OPT_SHOW */
-        show_clock(utc);
+        else
+                /* default HWCLOCK_OPT_SHOW */
+                show_clock(utc);
+
         return 0;
 }