added a clockconfig bin tool

it is only tested on R5, but should make its way on Haiku too


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10178 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/bin/Jamfile

@@ -1,9 +1,12 @@
 SubDir OBOS_TOP src apps bin ;
 
+UsePrivateHeaders kernel ;
+
 # standard commands that don't need any additional library
 StdBinCommands
 	chop.c
 	clear.c
+	clockconfig.c
 #	csplit.c
 	driveinfo.c
 #	echo.c

src/apps/bin/clockconfig.c

@@ -0,0 +1,81 @@
+/* 
+ * Copyright 2004, Jérôme Duval, [email protected].
+ * Distributed under the terms of the MIT License.
+ *
+ */
+
+#include <FindDirectory.h>
+#include <stdio.h>
+#include <string.h>
+#include <OS.h>
+
+//#define COMPILE_FOR_R5 1
+
+#ifdef COMPILE_FOR_R5
+void _kset_tzfilename_(const char* name, size_t length, bool unknown);
+void _kset_tzspecs_(uint32 timezone_offset, bool dst_observed);
+
+#define _kern_set_tzfilename _kset_tzfilename_
+#define _kern_set_tzspecs _kset_tzspecs_
+
+#else
+#include <syscalls.h>
+#endif
+
+int main(int argc, char **argv)
+{
+	char path[B_PATH_NAME_LENGTH];
+	char link[B_PATH_NAME_LENGTH];
+	FILE *file;
+	bool isGMT = true;
+	struct tm* tm = NULL;
+	time_t t;
+
+	printf("Looking for RTC settings file\n");
+	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, "/RTC_time_settings");
+	file = fopen(path, "r");	
+	if (file != NULL) {
+		char string[10];
+		fscanf(file, "%s", string);
+		if (strncmp(string, "local", 5) == 0)
+			isGMT = false;
+		fclose(file);
+	} else {
+		fprintf(stderr, "%s: can't read RTC settings\n", argv[0]);
+		printf("%s: No knowledge about contents of RTC\n", argv[0]);
+		return 0;
+	}
+
+	printf("%s: RTC stores %s time.\n", argv[0], isGMT ? "GMT" : "local" );
+
+	if(find_directory(B_USER_SETTINGS_DIRECTORY, -1, true, path, B_PATH_NAME_LENGTH)!=B_OK) {
+		fprintf(stderr, "can't find settings directory\n");
+		return 1;
+	}
+
+	strcat(path, "/timezone");
+
+	printf("Looking for %s file\n", path);
+	if (readlink(path, link, B_PATH_NAME_LENGTH) > 0) {
+		printf("%s: Setting timezone to '%s'\n", argv[0], link);
+		
+		_kern_set_tzfilename(link, strlen(link), isGMT);
+		
+		tzset();
+		
+		time(&t);
+		tm = localtime(&t);
+		_kern_set_tzspecs(tm->tm_gmtoff, tm->tm_isdst);		
+	
+	} else {
+		fprintf(stderr, "%s: can't read link for timezone\n", argv[0]);
+		printf("%s: No timezone setting.\n", argv[0]);
+	}
+
+	return 0;	
+}