Added dstcheck.

It is run once at system startup after app_server and co are running.
Its job is to make sure the system clock took daily saving time into account.
To do this, it compares DST from a config file with DST from current RTC info.
If they differ, a time-updated alert is showed to let the user choose what to do.
A system call was used on R5 to get the current RTC info.
Unless someone comes with a good reason to still use a syscall, it should stay as is.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10455 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/bin/Jamfile

@@ -52,6 +52,7 @@ StdBinCommands
 	clipboard.cpp
 	df.cpp
 	draggers.cpp
+	dstcheck.cpp
 #	factor.cpp
 	ffm.cpp
 	iroster.cpp

src/apps/bin/dstcheck.cpp

@@ -0,0 +1,140 @@
+/* 
+ * Copyright 2004, Jérôme Duval, jerome.duval@free.fr.
+ * Distributed under the terms of the MIT License.
+ */
+
+#include <Alert.h>
+#include <Application.h>
+#include <FindDirectory.h>
+#include <MessageRunner.h>
+#include <Roster.h>
+#include <String.h>
+#include <TextView.h>
+#include <stdio.h>
+
+const uint32 TIMEDALERT_UPDATE = 'taup';
+
+class TimedAlert : public BAlert
+{
+public:
+	TimedAlert(const char *title, const char *text, const char *button1,
+		const char *button2 = NULL, const char *button3 = NULL, 
+		button_width width = B_WIDTH_AS_USUAL,  alert_type type = B_INFO_ALERT);
+	void MessageReceived(BMessage *);
+	void Show();
+	static void GetLabel(BString &string);
+private:
+	BMessageRunner *fRunner;
+};
+
+#define STRING1 "Attention!\n\nBecause of the switch from daylight saving time,\nyour \
+computer's clock may be an hour off. Currently,\nyour computer thinks it is "
+#define STRING2 ".\n\nIs this the correct time?"
+
+TimedAlert::TimedAlert(const char *title, const char *text, const char *button1,
+	const char *button2 = NULL, const char *button3 = NULL,
+	button_width width = B_WIDTH_AS_USUAL,  alert_type type = B_INFO_ALERT)
+	: BAlert(title, text, button1, button2, button3, width, type),
+	fRunner(NULL)
+{
+	
+}
+
+
+void
+TimedAlert::Show()
+{
+	fRunner = new BMessageRunner(BMessenger(this), new BMessage(TIMEDALERT_UPDATE), 60000000);
+	BAlert::Show();
+}
+
+
+void 
+TimedAlert::MessageReceived(BMessage *msg)
+{
+	if (msg->what == TIMEDALERT_UPDATE) {
+		BString string;
+		GetLabel(string);	
+		this->TextView()->SetText(string.String());
+	} else
+		BAlert::MessageReceived(msg);
+}
+
+void
+TimedAlert::GetLabel(BString &string)
+{
+	string = STRING1;
+	time_t t;
+	struct tm tm;
+	char timestring[15];
+	time(&t);
+	localtime_r(&t, &tm);
+	strftime(timestring, 15, "%I:%M %p", &tm);
+	string += timestring;
+	string += STRING2;
+}
+
+
+int
+main(int argc, char **argv)
+{
+	time_t t;
+	struct tm tm;
+	time(&t);
+	localtime_r(&t, &tm);	
+
+	char path[B_PATH_NAME_LENGTH];	
+	if (find_directory(B_USER_SETTINGS_DIRECTORY, -1, true, path, B_PATH_NAME_LENGTH) != B_OK) {
+		fprintf(stderr, "%s: can't find settings directory\n", argv[0]);
+		exit(1);
+	}
+
+	strcat(path, "/time_dststatus");
+	bool newFile = false;
+	bool dst = false;
+	int fd = open(path, O_RDWR | O_EXCL | O_CREAT);
+	if (fd < 0) {
+		newFile = false;
+		fd = open(path, O_RDWR);
+		if (fd < 0) {
+			perror("couldn't open dst status settings file");
+			exit(1);
+		}
+
+		char dst_byte;
+		read(fd, &dst_byte, 1);
+
+		dst = dst_byte == '1';
+
+	} else {
+		dst = tm.tm_isdst;
+	}
+
+	if (dst != tm.tm_isdst) {
+
+		BApplication app("application/x-vnd.Haiku-cmd-dstconfig");	
+
+		BString string;
+		TimedAlert::GetLabel(string);
+
+		int32 index = (new TimedAlert("timedAlert", string.String(), "Ask me later", "Yes", "No"))->Go();
+		if (index == 0)
+			exit(0);
+
+		if (index == 2) {
+			index = (new BAlert("dstcheck", "Would you like to set the clock using the Time and\nDate preference utility?", 
+				"No", "Yes"))->Go();
+
+			if (index == 1)
+				be_roster->Launch("application/x-vnd.Be-TIME");
+		}
+	}
+
+	lseek(fd, 0, SEEK_SET);
+	char dst_byte = tm.tm_isdst ? '1' : '0';
+	write(fd, &dst_byte, 1);
+	close(fd);
+	
+	return 0;	
+}
+