244 lines
6.8 KiB
C
244 lines
6.8 KiB
C
/* tzset.c: Convert current Windows timezone to POSIX timezone information.
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Copyright 2012, 2013, 2014 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include <errno.h>
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#include <stdio.h>
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#include <inttypes.h>
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#include <wchar.h>
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#include <locale.h>
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#include <getopt.h>
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#include <cygwin/version.h>
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#include <windows.h>
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#ifndef GEOID_NOT_AVAILABLE
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#define GEOID_NOT_AVAILABLE -1
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#endif
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/* The auto-generated tzmap.h contains the mapping table from Windows timezone
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and country per ISO 3166-1 to POSIX timezone. For more info, see the file
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itself. */
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#include "tzmap.h"
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#define TZMAP_SIZE (sizeof tzmap / sizeof tzmap[0])
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static struct option longopts[] =
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{
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{"help", no_argument, NULL, 'h' },
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{"version", no_argument, NULL, 'V'},
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{NULL, 0, NULL, 0}
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};
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static char opts[] = "hV";
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#define REG_TZINFO L"SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation"
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#define REG_TZDB L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones"
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static inline HKEY
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reg_open (HKEY pkey, PCWSTR path, const char *msg)
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{
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LONG ret;
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HKEY hkey;
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ret = RegOpenKeyExW (pkey, path, 0, KEY_READ, &hkey);
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if (ret == ERROR_SUCCESS)
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return hkey;
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if (msg)
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fprintf (stderr, "%s: cannot open registry %s, error code %" PRIu32 "\n",
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program_invocation_short_name, msg, (unsigned int) ret);
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return NULL;
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}
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/* For symmetry */
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#define reg_close(hkey) RegCloseKey(hkey)
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static inline BOOL
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reg_query (HKEY hkey, PCWSTR value, PWCHAR buf, DWORD size, const char *msg)
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{
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LONG ret;
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DWORD type;
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ret = RegQueryValueExW (hkey, value, 0, &type, (LPBYTE) buf, &size);
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if (ret == ERROR_SUCCESS)
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return TRUE;
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if (msg)
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fprintf (stderr, "%s: cannot query registry %s, error code %" PRIu32 "\n",
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program_invocation_short_name, msg, (unsigned int) ret);
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return FALSE;
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}
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static inline BOOL
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reg_enum (HKEY hkey, int idx, PWCHAR name, DWORD size)
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{
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return RegEnumKeyExW (hkey, idx, name, &size, NULL, NULL, NULL, NULL)
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== ERROR_SUCCESS;
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}
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static void
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usage (FILE *stream)
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{
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fprintf (stream, ""
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"Usage: %1$s [OPTION]\n"
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"\n"
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"Print POSIX-compatible timezone ID from current Windows timezone setting\n"
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"\n"
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"Options:\n"
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" -h, --help output usage information and exit.\n"
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" -V, --version output version information and exit.\n"
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"\n"
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"Use %1$s to set your TZ variable. In POSIX-compatible shells like bash,\n"
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"dash, mksh, or zsh:\n"
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"\n"
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" export TZ=$(%1$s)\n"
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"\n"
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"In csh-compatible shells like tcsh:\n"
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"\n"
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" setenv TZ `%1$s`\n"
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"\n", program_invocation_short_name);
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};
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static void
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print_version ()
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{
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printf ("tzset (cygwin) %d.%d.%d\n"
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"POSIX-timezone generator\n"
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"Copyright (C) 2012 - %s Red Hat, Inc.\n"
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"This is free software; see the source for copying conditions. There is NO\n"
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"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n",
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CYGWIN_VERSION_DLL_MAJOR / 1000,
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CYGWIN_VERSION_DLL_MAJOR % 1000,
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CYGWIN_VERSION_DLL_MINOR,
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strrchr (__DATE__, ' ') + 1);
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}
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int
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main (int argc, char **argv)
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{
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BOOL ret;
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HKEY hkey, skey;
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WCHAR keyname[256], stdname[256], std2name[256], country[10], *spc;
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GEOID geo;
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int opt, idx, gotit = -1;
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setlocale (LC_ALL, "");
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while ((opt = getopt_long (argc, argv, opts, longopts, NULL)) != EOF)
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switch (opt)
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{
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case 'h':
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usage (stdout);
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return 0;
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case 'V':
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print_version ();
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return 0;
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default:
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fprintf (stderr, "Try `%s --help' for more information.\n",
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program_invocation_short_name);
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return 1;
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}
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if (optind < argc)
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{
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usage (stderr);
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return 1;
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}
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/* First fetch current timezone information from registry. */
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hkey = reg_open (HKEY_LOCAL_MACHINE, REG_TZINFO, "timezone information");
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if (!hkey)
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return 1;
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/* Vista introduced the TimeZoneKeyName value, which simplifies the
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job a lot. */
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if (!reg_query (hkey, L"TimeZoneKeyName", keyname, sizeof keyname, NULL))
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{
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/* Pre-Vista we have a lot more to do. First fetch the name of the
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Standard (non-DST) timezone. If we can't get that, give up. */
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if (!reg_query (hkey, L"StandardName", stdname, sizeof stdname,
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"timezone information"))
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{
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reg_close (hkey);
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return 1;
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}
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reg_close (hkey);
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/* Now open the timezone database registry key. Every subkey is a
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timezone. The key name is what we're after, but to find the right
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one, we have to compare the name of the previously fetched
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"StandardName" with the "Std" value in the timezone info... */
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hkey = reg_open (HKEY_LOCAL_MACHINE, REG_TZDB, "timezone database");
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if (!hkey)
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return 1;
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for (idx = 0; reg_enum (hkey, idx, keyname, sizeof keyname); ++idx)
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{
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skey = reg_open (hkey, keyname, NULL);
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if (skey)
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{
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/* ...however, on MUI-enabled machines, the names are not stored
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directly in the above StandardName, rather it is a resource
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pointer into tzres.dll. This is stored in MUI_Std.
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Fortunately it's easy to recognize this situation: If
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StandardName starts with @, it's a resource pointer, otherwise
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it's the cleartext value. */
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ret = reg_query (skey, stdname[0] == L'@' ? L"MUI_Std" : L"Std",
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std2name, sizeof std2name, NULL);
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reg_close (skey);
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if (ret && !wcscmp (stdname, std2name))
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break;
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}
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}
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}
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reg_close (hkey);
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/* We fetch the current Geo-location of the user and convert it to an
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ISO 3166-1 compatible nation code. */
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*country = L'\0';
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geo = GetUserGeoID (GEOCLASS_NATION);
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if (geo != GEOID_NOT_AVAILABLE)
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GetGeoInfoW (geo, GEO_ISO2, country, sizeof country, 0);
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/* If, for some reason, the Geo-location isn't available, we use the locale
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setting instead. */
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if (!*country)
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GetLocaleInfoW (LOCALE_USER_DEFAULT, LOCALE_SISO3166CTRYNAME,
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country, sizeof country);
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/* Now iterate over the mapping table and find the right entry. */
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for (idx = 0; idx < TZMAP_SIZE; ++idx)
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{
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if (!wcscmp (keyname, tzmap[idx].win_tzkey))
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{
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if (gotit < 0)
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gotit = idx;
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if (!wcscmp (country, tzmap[idx].country))
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break;
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}
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else if (gotit >= 0)
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{
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idx = gotit;
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break;
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}
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}
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if (idx >= TZMAP_SIZE)
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{
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if (gotit < 0)
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{
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fprintf (stderr,
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"%s: can't find matching POSIX timezone for "
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"Windows timezone \"%ls\"\n",
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program_invocation_short_name, keyname);
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return 1;
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}
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idx = gotit;
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}
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/* Got one. Print it.
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Note: The tzmap array is in the R/O data section on x86_64. Don't
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try to overwrite the space, as the code did originally. */
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spc = wcschr (tzmap[idx].posix_tzid, L' ');
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if (!spc)
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spc = wcschr (tzmap[idx].posix_tzid, L'\0');
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printf ("%.*ls\n", (int) (spc - tzmap[idx].posix_tzid), tzmap[idx].posix_tzid);
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return 0;
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}
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