added -startdate option

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3540 c046a42c-6fe2-441c-8c8c-71466251a162

hw/mc146818rtc.c

@@ -393,11 +393,16 @@ void rtc_set_date_from_host(RTCState *s)
     int val;
 
     /* set the CMOS date */
-    time(&ti);
-    if (rtc_utc)
+    if (rtc_start_date == -1) {
+        time(&ti);
+        if (rtc_utc)
+            tm = gmtime(&ti);
+        else
+            tm = localtime(&ti);
+    } else {
+        ti = rtc_start_date;
         tm = gmtime(&ti);
-    else
-        tm = localtime(&ti);
+    }
     rtc_set_date(s, tm);
 
     val = to_bcd(s, (tm->tm_year / 100) + 19);

qemu-doc.texi

@@ -268,6 +268,11 @@ Set the real time clock to local time (the default is to UTC
 time). This option is needed to have correct date in MS-DOS or
 Windows.
 
+@item -startdate date
+Set the initial date of the real time clock. Valid format for
+@var{date} are: @code{now} or @code{2006-06-17T16:01:21} or
+@code{2006-06-17}. The default value is @code{now}.
+
 @item -pidfile file
 Store the QEMU process PID in @var{file}. It is useful if you launch QEMU
 from a script.

vl.c

@@ -174,6 +174,7 @@ int nb_nics;
 NICInfo nd_table[MAX_NICS];
 int vm_running;
 int rtc_utc = 1;
+int rtc_start_date = -1; /* -1 means now */
 int cirrus_vga_enabled = 1;
 int vmsvga_enabled = 0;
 #ifdef TARGET_SPARC
@@ -7212,6 +7213,7 @@ enum {
     QEMU_OPTION_prom_env,
     QEMU_OPTION_old_param,
     QEMU_OPTION_clock,
+    QEMU_OPTION_startdate,
 };
 
 typedef struct QEMUOption {
@@ -7318,6 +7320,7 @@ const QEMUOption qemu_options[] = {
     { "old-param", 0, QEMU_OPTION_old_param },
 #endif
     { "clock", HAS_ARG, QEMU_OPTION_clock },
+    { "startdate", HAS_ARG, QEMU_OPTION_startdate },
     { NULL },
 };
 
@@ -8107,6 +8110,42 @@ int main(int argc, char **argv)
             case QEMU_OPTION_clock:
                 configure_alarms(optarg);
                 break;
+            case QEMU_OPTION_startdate:
+                {
+                    struct tm tm;
+                    if (!strcmp(optarg, "now")) {
+                        rtc_start_date = -1;
+                    } else {
+                        if (sscanf(optarg, "%d-%d-%dT%d:%d:%d",
+                               &tm.tm_year,
+                               &tm.tm_mon,
+                               &tm.tm_mday,
+                               &tm.tm_hour,
+                               &tm.tm_min,
+                               &tm.tm_sec) == 6) {
+                            /* OK */
+                        } else if (sscanf(optarg, "%d-%d-%d",
+                                          &tm.tm_year,
+                                          &tm.tm_mon,
+                                          &tm.tm_mday) == 3) {
+                            tm.tm_hour = 0;
+                            tm.tm_min = 0;
+                            tm.tm_sec = 0;
+                        } else {
+                            goto date_fail;
+                        }
+                        tm.tm_year -= 1900;
+                        tm.tm_mon--;
+                        rtc_start_date = timegm(&tm);
+                        if (rtc_start_date == -1) {
+                        date_fail:
+                            fprintf(stderr, "Invalid date format. Valid format are:\n"
+                                    "'now' or '2006-06-17T16:01:21' or '2006-06-17'\n");
+                            exit(1);
+                        }
+                    }
+                }
+                break;
             }
         }
     }

vl.h

@@ -166,6 +166,7 @@ void main_loop_wait(int timeout);
 extern int ram_size;
 extern int bios_size;
 extern int rtc_utc;
+extern int rtc_start_date;
 extern int cirrus_vga_enabled;
 extern int vmsvga_enabled;
 extern int graphic_width;