glib/gwin32.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1998  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  * Copyright (C) 1998-1999  Tor Lillqvist
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  23  * file for a list of people on the GLib Team.  See the ChangeLog
  24  * files for a list of changes.  These files are distributed with
  25  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  26  */
  27
  28 /*
  29  * MT safe for the unix part, FIXME: make the win32 part MT safe as well.
  30  */
  31
  32 #include "config.h"
  33
  34 #include "glibconfig.h"
  35
  36 #include <stdlib.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <errno.h>
  40
  41 #define STRICT                  /* Strict typing, please */
  42 #include <windows.h>
  43 #undef STRICT
  44 #ifndef G_WITH_CYGWIN
  45 #include <direct.h>
  46 #endif
  47 #include <errno.h>
  48 #include <ctype.h>
  49 #ifdef _MSC_VER
  50 #  include <io.h>
  51 #endif /* _MSC_VER */
  52
  53 #include "glib.h"
  54
  55 #ifdef G_WITH_CYGWIN
  56 #include <sys/cygwin.h>
  57 #endif
  58
  59 #ifndef G_WITH_CYGWIN
  60
  61 gint
  62 g_win32_ftruncate (gint  fd,
  63                    guint size)
  64 {
  65   HANDLE hfile;
  66   guint curpos;
  67
  68   g_return_val_if_fail (fd >= 0, -1);
  69
  70   hfile = (HANDLE) _get_osfhandle (fd);
  71   curpos = SetFilePointer (hfile, 0, NULL, FILE_CURRENT);
  72   if (curpos == 0xFFFFFFFF
  73       || SetFilePointer (hfile, size, NULL, FILE_BEGIN) == 0xFFFFFFFF
  74       || !SetEndOfFile (hfile))
  75     {
  76       gint error = GetLastError ();
  77
  78       switch (error)
  79         {
  80         case ERROR_INVALID_HANDLE:
  81           errno = EBADF;
  82           break;
  83         default:
  84           errno = EIO;
  85           break;
  86         }
  87
  88       return -1;
  89     }
  90
  91   return 0;
  92 }
  93
  94 #endif
  95
  96 /**
  97  * g_win32_getlocale:
  98  *
  99  * The setlocale in the Microsoft C library uses locale names of the
 100  * form "English_United States.1252" etc. We want the UNIXish standard
 101  * form "en_US", "zh_TW" etc. This function gets the current thread
 102  * locale from Windows - without any encoding info - and returns it as
 103  * a string of the above form for use in forming file names etc. The
 104  * returned string should be deallocated with g_free().
 105  *
 106  * Returns: newly-allocated locale name.
 107  **/
 108
 109 gchar *
 110 g_win32_getlocale (void)
 111 {
 112   LCID lcid;
 113   LANGID langid;
 114   gchar *ev;
 115   gint primary, sub;
 116   gchar *l = NULL, *sl = NULL;
 117   gchar bfr[20];
 118
 119   /* Let the user override the system settings through environment
 120      variables, as on POSIX systems.  */
 121   if (((ev = getenv ("LC_ALL")) != NULL && ev[0] != '\0')
 122       || ((ev = getenv ("LC_MESSAGES")) != NULL && ev[0] != '\0')
 123       || ((ev = getenv ("LANG")) != NULL && ev[0] != '\0'))
 124     return g_strdup (ev);
 125
 126   /* Use native Win32 API locale ID.  */
 127   lcid = GetThreadLocale ();
 128
 129   /* Strip off the sorting rules, keep only the language part.  */
 130   langid = LANGIDFROMLCID (lcid);
 131
 132   /* Split into language and territory part.  */
 133   primary = PRIMARYLANGID (langid);
 134   sub = SUBLANGID (langid);
 135   switch (primary)
 136     {
 137     case LANG_AFRIKAANS: l = "af"; sl = "ZA"; break;
 138     case LANG_ALBANIAN: l = "sq"; sl = "AL"; break;
 139     case LANG_ARABIC:
 140       l = "ar";
 141       switch (sub)
 142         {
 143         case SUBLANG_ARABIC_SAUDI_ARABIA: sl = "SA"; break;
 144         case SUBLANG_ARABIC_IRAQ: sl = "IQ"; break;
 145         case SUBLANG_ARABIC_EGYPT: sl = "EG"; break;
 146         case SUBLANG_ARABIC_LIBYA: sl = "LY"; break;
 147         case SUBLANG_ARABIC_ALGERIA: sl = "DZ"; break;
 148         case SUBLANG_ARABIC_MOROCCO: sl = "MA"; break;
 149         case SUBLANG_ARABIC_TUNISIA: sl = "TN"; break;
 150         case SUBLANG_ARABIC_OMAN: sl = "OM"; break;
 151         case SUBLANG_ARABIC_YEMEN: sl = "YE"; break;
 152         case SUBLANG_ARABIC_SYRIA: sl = "SY"; break;
 153         case SUBLANG_ARABIC_JORDAN: sl = "JO"; break;
 154         case SUBLANG_ARABIC_LEBANON: sl = "LB"; break;
 155         case SUBLANG_ARABIC_KUWAIT: sl = "KW"; break;
 156         case SUBLANG_ARABIC_UAE: sl = "AE"; break;
 157         case SUBLANG_ARABIC_BAHRAIN: sl = "BH"; break;
 158         case SUBLANG_ARABIC_QATAR: sl = "QA"; break;
 159         }
 160       break;
 161 #ifdef LANG_ARMENIAN
 162     case LANG_ARMENIAN: l = "hy"; sl = "AM"; break;
 163 #endif
 164 #ifdef LANG_ASSAMESE
 165     case LANG_ASSAMESE: l = "as"; sl = "IN"; break;
 166 #endif
 167 #ifdef LANG_AZERI
 168     case LANG_AZERI:
 169       l = "az";
 170 #if defined (SUBLANG_AZERI_LATIN) && defined (SUBLANG_AZERI_CYRILLIC)
 171       switch (sub)
 172         {
 173         /* FIXME: Adjust this when Azerbaijani locales appear on Unix.  */
 174         case SUBLANG_AZERI_LATIN: sl = "@latin"; break;
 175         case SUBLANG_AZERI_CYRILLIC: sl = "@cyrillic"; break;
 176         }
 177 #endif
 178       break;
 179 #endif
 180     case LANG_BASQUE:
 181       l = "eu"; /* sl could be "ES" or "FR".  */
 182       break;
 183     case LANG_BELARUSIAN: l = "be"; sl = "BY"; break;
 184 #ifdef LANG_BENGALI
 185     case LANG_BENGALI: l = "bn"; sl = "IN"; break;
 186 #endif
 187     case LANG_BULGARIAN: l = "bg"; sl = "BG"; break;
 188     case LANG_CATALAN: l = "ca"; sl = "ES"; break;
 189     case LANG_CHINESE:
 190       l = "zh";
 191       switch (sub)
 192         {
 193         case SUBLANG_CHINESE_TRADITIONAL: sl = "TW"; break;
 194         case SUBLANG_CHINESE_SIMPLIFIED: sl = "CN"; break;
 195         case SUBLANG_CHINESE_HONGKONG: sl = "HK"; break;
 196         case SUBLANG_CHINESE_SINGAPORE: sl = "SG"; break;
 197 #ifdef SUBLANG_CHINESE_MACAU
 198         case SUBLANG_CHINESE_MACAU: sl = "MO"; break;
 199 #endif
 200         }
 201       break;
 202     case LANG_CROATIAN:         /* LANG_CROATIAN == LANG_SERBIAN
 203                                  * What used to be called Serbo-Croatian
 204                                  * should really now be two separate
 205                                  * languages because of political reasons.
 206                                  * (Says tml, who knows nothing about Serbian
 207                                  * or Croatian.)
 208                                  * (I can feel those flames coming already.)
 209                                  */
 210       switch (sub)
 211         {
 212         /* FIXME: How to distinguish Croatian and Latin Serbian locales?  */
 213         case SUBLANG_SERBIAN_LATIN: l = "sr"; break;
 214         case SUBLANG_SERBIAN_CYRILLIC: l = "sr"; sl = "@cyrillic"; break;
 215         default: l = "hr"; sl = "HR";
 216         }
 217       break;
 218     case LANG_CZECH: l = "cs"; sl = "CZ"; break;
 219     case LANG_DANISH: l = "da"; sl = "DK"; break;
 220 #ifdef LANG_DIVEHI
 221     case LANG_DIVEHI: l = "div"; sl = "MV"; break;
 222 #endif
 223     case LANG_DUTCH:
 224       l = "nl";
 225       switch (sub)
 226         {
 227         case SUBLANG_DUTCH: sl = "NL"; break;
 228         case SUBLANG_DUTCH_BELGIAN: sl = "BE"; break;
 229         }
 230       break;
 231     case LANG_ENGLISH:
 232       l = "en";
 233       switch (sub)
 234         {
 235         case SUBLANG_ENGLISH_US: sl = "US"; break;
 236         case SUBLANG_ENGLISH_UK: sl = "GB"; break;
 237         case SUBLANG_ENGLISH_AUS: sl = "AU"; break;
 238         case SUBLANG_ENGLISH_CAN: sl = "CA"; break;
 239         case SUBLANG_ENGLISH_NZ: sl = "NZ"; break;
 240         case SUBLANG_ENGLISH_EIRE: sl = "IE"; break;
 241         case SUBLANG_ENGLISH_SOUTH_AFRICA: sl = "ZA"; break;
 242         case SUBLANG_ENGLISH_JAMAICA: sl = "JM"; break;
 243         case SUBLANG_ENGLISH_CARIBBEAN: sl = "GD"; break; /* Grenada? */
 244         case SUBLANG_ENGLISH_BELIZE: sl = "BZ"; break;
 245         case SUBLANG_ENGLISH_TRINIDAD: sl = "TT"; break;
 246 #ifdef SUBLANG_ENGLISH_ZIMBABWE
 247         case SUBLANG_ENGLISH_ZIMBABWE: sl = "ZW"; break;
 248 #endif
 249 #ifdef SUBLANG_ENGLISH_PHILIPPINES
 250         case SUBLANG_ENGLISH_PHILIPPINES: sl = "PH"; break;
 251 #endif
 252         }
 253       break;
 254     case LANG_ESTONIAN: l = "et"; sl = "EE"; break;
 255     case LANG_FAEROESE: l = "fo"; sl = "FO"; break;
 256     case LANG_FARSI: l = "fa"; sl = "IR"; break;
 257     case LANG_FINNISH: l = "fi"; sl = "FI"; break;
 258     case LANG_FRENCH:
 259       l = "fr";
 260       switch (sub)
 261         {
 262         case SUBLANG_FRENCH: sl = "FR"; break;
 263         case SUBLANG_FRENCH_BELGIAN: sl = "BE"; break;
 264         case SUBLANG_FRENCH_CANADIAN: sl = "CA"; break;
 265         case SUBLANG_FRENCH_SWISS: sl = "CH"; break;
 266         case SUBLANG_FRENCH_LUXEMBOURG: sl = "LU"; break;
 267 #ifdef SUBLANG_FRENCH_MONACO
 268         case SUBLANG_FRENCH_MONACO: sl = "MC"; break;
 269 #endif
 270         }
 271       break;
 272       /* FIXME: LANG_GALICIAN: What's the code for Galician? */
 273 #ifdef LANG_GEORGIAN
 274     case LANG_GEORGIAN: l = "ka"; sl = "GE"; break;
 275 #endif
 276     case LANG_GERMAN:
 277       l = "de";
 278       switch (sub)
 279         {
 280         case SUBLANG_GERMAN: sl = "DE"; break;
 281         case SUBLANG_GERMAN_SWISS: sl = "CH"; break;
 282         case SUBLANG_GERMAN_AUSTRIAN: sl = "AT"; break;
 283         case SUBLANG_GERMAN_LUXEMBOURG: sl = "LU"; break;
 284         case SUBLANG_GERMAN_LIECHTENSTEIN: sl = "LI"; break;
 285         }
 286       break;
 287     case LANG_GREEK: l = "el"; sl = "GR"; break;
 288 #ifdef LANG_GUJARATI
 289     case LANG_GUJARATI: l = "gu"; sl = "IN"; break;
 290 #endif
 291     case LANG_HEBREW: l = "he"; sl = "IL"; break;
 292 #ifdef LANG_HINDI
 293     case LANG_HINDI: l = "hi"; sl = "IN"; break;
 294 #endif
 295     case LANG_HUNGARIAN: l = "hu"; sl = "HU"; break;
 296     case LANG_ICELANDIC: l = "is"; sl = "IS"; break;
 297     case LANG_INDONESIAN: l = "id"; sl = "ID"; break;
 298     case LANG_ITALIAN:
 299       l = "it";
 300       switch (sub)
 301         {
 302         case SUBLANG_ITALIAN: sl = "IT"; break;
 303         case SUBLANG_ITALIAN_SWISS: sl = "CH"; break;
 304         }
 305       break;
 306     case LANG_JAPANESE: l = "ja"; sl = "JP"; break;
 307 #ifdef LANG_KANNADA
 308     case LANG_KANNADA: l = "kn"; sl = "IN"; break;
 309 #endif
 310 #ifdef LANG_KASHMIRI
 311     case LANG_KASHMIRI:
 312       l = "ks";
 313       switch (sub)
 314         {
 315         case SUBLANG_DEFAULT: sl = "PK"; break;
 316 #ifdef SUBLANG_KASHMIRI_INDIA
 317         case SUBLANG_KASHMIRI_INDIA: sl = "IN"; break;
 318 #endif
 319         }
 320       break;
 321 #endif
 322 #ifdef LANG_KAZAK
 323     case LANG_KAZAK: l = "kk"; sl = "KZ"; break;
 324 #endif
 325 #ifdef LANG_KONKANI
 326     case LANG_KONKANI:
 327       /* FIXME: Adjust this when such locales appear on Unix.  */
 328       l = "kok"; sl = "IN";
 329       break;
 330 #endif
 331     case LANG_KOREAN: l = "ko"; sl = "KR"; break;
 332 #ifdef LANG_KYRGYZ
 333     case LANG_KYRGYZ: l = "ky"; sl = "KG"; /* ??? */ break;
 334 #endif
 335     case LANG_LATVIAN: l = "lv"; sl = "LV"; break;
 336     case LANG_LITHUANIAN: l = "lt"; sl = "LT"; break;
 337 #ifdef LANG_MACEDONIAN
 338     case LANG_MACEDONIAN: l = "mk"; sl = "MK"; break;
 339 #endif
 340 #ifdef LANG_MALAY
 341     case LANG_MALAY:
 342       l = "ms";
 343       switch (sub)
 344         {
 345 #ifdef SUBLANG_MALAY_MALAYSIA
 346         case SUBLANG_MALAY_MALAYSIA: sl = "MY"; break;
 347 #endif
 348 #ifdef SUBLANG_MALAY_BRUNEI_DARUSSALAM
 349         case SUBLANG_MALAY_BRUNEI_DARUSSALAM: sl = "BN"; break;
 350 #endif
 351         }
 352       break;
 353 #endif
 354 #ifdef LANG_MALAYALAM
 355     case LANG_MALAYALAM: l = "ml"; sl = "IN"; break;
 356 #endif
 357 #ifdef LANG_MANIPURI
 358     case LANG_MANIPURI:
 359       /* FIXME: Adjust this when such locales appear on Unix.  */
 360       l = "mni"; sl = "IN";
 361       break;
 362 #endif
 363 #ifdef LANG_MARATHI
 364     case LANG_MARATHI: l = "mr"; sl = "IN"; break;
 365 #endif
 366 #ifdef LANG_MONGOLIAN
 367     case LANG_MONGOLIAN: l = "mn"; sl = "MN"; break;
 368 #endif
 369 #ifdef LANG_NEPALI
 370     case LANG_NEPALI:
 371       l = "ne";
 372       switch (sub)
 373         {
 374         case SUBLANG_DEFAULT: sl = "NP"; break;
 375 #ifdef SUBLANG_NEPALI_INDIA
 376         case SUBLANG_NEPALI_INDIA: sl = "IN"; break;
 377 #endif
 378         }
 379       break;
 380 #endif
 381     case LANG_NORWEGIAN:
 382       l = "no";
 383       switch (sub)
 384         {
 385         case SUBLANG_NORWEGIAN_BOKMAL: sl = "NO"; break;
 386         case SUBLANG_NORWEGIAN_NYNORSK: l = "nn"; sl = "NO"; break;
 387         }
 388       break;
 389 #ifdef LANG_ORIYA
 390     case LANG_ORIYA: l = "or"; sl = "IN"; break;
 391 #endif
 392     case LANG_POLISH: l = "pl"; sl = "PL"; break;
 393     case LANG_PORTUGUESE:
 394       l = "pt";
 395       switch (sub)
 396         {
 397         case SUBLANG_PORTUGUESE: sl = "PT"; break;
 398         case SUBLANG_PORTUGUESE_BRAZILIAN: sl = "BR"; break;
 399         }
 400       break;
 401 #ifdef LANG_PUNJABI
 402     case LANG_PUNJABI: l = "pa"; sl = "IN"; break;
 403 #endif
 404     case LANG_ROMANIAN: l = "ro"; sl = "RO"; break;
 405     case LANG_RUSSIAN:
 406       l = "ru"; /* sl could be "RU" or "UA".  */
 407       break;
 408 #ifdef LANG_SANSKRIT
 409     case LANG_SANSKRIT: l = "sa"; sl = "IN"; break;
 410 #endif
 411 #ifdef LANG_SINDHI
 412     case LANG_SINDHI: l = "sd"; break;
 413 #endif
 414     case LANG_SLOVAK: l = "sk"; sl = "SK"; break;
 415     case LANG_SLOVENIAN: l = "sl"; sl = "SI"; break;
 416 #ifdef LANG_SORBIAN
 417     case LANG_SORBIAN:
 418       /* FIXME: Adjust this when such locales appear on Unix.  */
 419       l = "wen"; sl = "DE";
 420       break;
 421 #endif
 422     case LANG_SPANISH:
 423       l = "es";
 424       switch (sub)
 425         {
 426         case SUBLANG_SPANISH: sl = "ES"; break;
 427         case SUBLANG_SPANISH_MEXICAN: sl = "MX"; break;
 428         case SUBLANG_SPANISH_MODERN:
 429           sl = "ES@modern"; break;      /* not seen on Unix */
 430         case SUBLANG_SPANISH_GUATEMALA: sl = "GT"; break;
 431         case SUBLANG_SPANISH_COSTA_RICA: sl = "CR"; break;
 432         case SUBLANG_SPANISH_PANAMA: sl = "PA"; break;
 433         case SUBLANG_SPANISH_DOMINICAN_REPUBLIC: sl = "DO"; break;
 434         case SUBLANG_SPANISH_VENEZUELA: sl = "VE"; break;
 435         case SUBLANG_SPANISH_COLOMBIA: sl = "CO"; break;
 436         case SUBLANG_SPANISH_PERU: sl = "PE"; break;
 437         case SUBLANG_SPANISH_ARGENTINA: sl = "AR"; break;
 438         case SUBLANG_SPANISH_ECUADOR: sl = "EC"; break;
 439         case SUBLANG_SPANISH_CHILE: sl = "CL"; break;
 440         case SUBLANG_SPANISH_URUGUAY: sl = "UY"; break;
 441         case SUBLANG_SPANISH_PARAGUAY: sl = "PY"; break;
 442         case SUBLANG_SPANISH_BOLIVIA: sl = "BO"; break;
 443         case SUBLANG_SPANISH_EL_SALVADOR: sl = "SV"; break;
 444         case SUBLANG_SPANISH_HONDURAS: sl = "HN"; break;
 445         case SUBLANG_SPANISH_NICARAGUA: sl = "NI"; break;
 446         case SUBLANG_SPANISH_PUERTO_RICO: sl = "PR"; break;
 447         }
 448       break;
 449 #ifdef LANG_SWAHILI
 450     case LANG_SWAHILI: l = "sw"; break;
 451 #endif
 452     case LANG_SWEDISH:
 453       l = "sv";
 454       switch (sub)
 455         {
 456         case SUBLANG_DEFAULT: sl = "SE"; break;
 457         case SUBLANG_SWEDISH_FINLAND: sl = "FI"; break;
 458         }
 459       break;
 460 #ifdef LANG_SYRIAC
 461     case LANG_SYRIAC: l = "syr"; break;
 462 #endif
 463 #ifdef LANG_TAMIL
 464     case LANG_TAMIL:
 465       l = "ta"; /* sl could be "IN" or "LK".  */
 466       break;
 467 #endif
 468 #ifdef LANG_TATAR
 469     case LANG_TATAR: l = "tt"; break;
 470 #endif
 471 #ifdef LANG_TELUGU
 472     case LANG_TELUGU: l = "te"; sl = "IN"; break;
 473 #endif
 474     case LANG_THAI: l = "th"; sl = "TH"; break;
 475     case LANG_TURKISH: l = "tr"; sl = "TR"; break;
 476     case LANG_UKRAINIAN: l = "uk"; sl = "UA"; break;
 477 #ifdef LANG_URDU
 478     case LANG_URDU:
 479       l = "ur";
 480       switch (sub)
 481         {
 482 #ifdef SUBLANG_URDU_PAKISTAN
 483         case SUBLANG_URDU_PAKISTAN: sl = "PK"; break;
 484 #endif
 485 #ifdef SUBLANG_URDU_INDIA
 486         case SUBLANG_URDU_INDIA: sl = "IN"; break;
 487 #endif
 488         }
 489       break;
 490 #endif
 491 #ifdef LANG_UZBEK
 492     case LANG_UZBEK:
 493       l = "uz";
 494       switch (sub)
 495         {
 496         /* FIXME: Adjust this when Uzbek locales appear on Unix.  */
 497 #ifdef SUBLANG_UZBEK_LATIN
 498         case SUBLANG_UZBEK_LATIN: sl = "UZ@latin"; break;
 499 #endif
 500 #ifdef SUBLANG_UZBEK_CYRILLIC
 501         case SUBLANG_UZBEK_CYRILLIC: sl = "UZ@cyrillic"; break;
 502 #endif
 503         }
 504       break;
 505 #endif
 506     case LANG_VIETNAMESE: l = "vi"; sl = "VN"; break;
 507     default: l = "xx"; break;
 508     }
 509   strcpy (bfr, l);
 510   if (sl != NULL)
 511     {
 512       if (sl[0] != '@')
 513         strcat (bfr, "_");
 514       strcat (bfr, sl);
 515     }
 516
 517   return g_strdup (bfr);
 518 }
 519
 520 /**
 521  * g_win32_error_message:
 522  * @error: error code.
 523  *
 524  * Translate a Win32 error code (as returned by GetLastError()) into
 525  * the corresponding message. The message is either language neutral,
 526  * or in the thread's language, or the user's language, the system's
 527  * language, or US English (see docs for <function>FormatMessage()</function>). *
 528  * The returned string should be deallocated with g_free().
 529  *
 530  * Returns: newly-allocated error message
 531  **/
 532 gchar *
 533 g_win32_error_message (gint error)
 534 {
 535   gchar *msg;
 536   gchar *retval;
 537   int nbytes;
 538
 539   FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER
 540                  |FORMAT_MESSAGE_IGNORE_INSERTS
 541                  |FORMAT_MESSAGE_FROM_SYSTEM,
 542                  NULL, error, 0,
 543                  (LPTSTR) &msg, 0, NULL);
 544   nbytes = strlen (msg);
 545
 546   if (nbytes > 2 && msg[nbytes-1] == '\n' && msg[nbytes-2] == '\r')
 547     msg[nbytes-2] = '\0';
 548
 549   retval = g_strdup (msg);
 550
 551   if (msg != NULL)
 552     LocalFree (msg);
 553
 554   return retval;
 555 }
 556
 557 static gchar *
 558 get_package_directory_from_module (gchar *module_name)
 559 {
 560   static GHashTable *module_dirs = NULL;
 561   G_LOCK_DEFINE_STATIC (module_dirs);
 562   HMODULE hmodule = NULL;
 563   gchar *fn;
 564   gchar *p;
 565   gchar *result;
 566
 567   G_LOCK (module_dirs);
 568
 569   if (module_dirs == NULL)
 570     module_dirs = g_hash_table_new (g_str_hash, g_str_equal);
 571
 572   result = g_hash_table_lookup (module_dirs, module_name ? module_name : "");
 573
 574   if (result)
 575     {
 576       G_UNLOCK (module_dirs);
 577       return g_strdup (result);
 578     }
 579
 580   if (module_name)
 581     {
 582       hmodule = GetModuleHandle (module_name);
 583       if (!hmodule)
 584         return NULL;
 585     }
 586
 587   fn = g_malloc (MAX_PATH);
 588   if (!GetModuleFileName (hmodule, fn, MAX_PATH))
 589     {
 590       G_UNLOCK (module_dirs);
 591       g_free (fn);
 592       return NULL;
 593     }
 594
 595   if ((p = strrchr (fn, G_DIR_SEPARATOR)) != NULL)
 596     *p = '\0';
 597
 598   p = strrchr (fn, G_DIR_SEPARATOR);
 599   if (p && (g_ascii_strcasecmp (p + 1, "bin") == 0 ||
 600             g_ascii_strcasecmp (p + 1, "lib") == 0))
 601     *p = '\0';
 602
 603 #ifdef G_WITH_CYGWIN
 604   /* In Cygwin we need to have POSIX paths */
 605   {
 606     gchar tmp[MAX_PATH];
 607
 608     cygwin_conv_to_posix_path(fn, tmp);
 609     g_free(fn);
 610     fn = g_strdup(tmp);
 611   }
 612 #endif
 613
 614   g_hash_table_insert (module_dirs, module_name ? module_name : "", fn);
 615
 616   G_UNLOCK (module_dirs);
 617
 618   return g_strdup (fn);
 619 }
 620
 621 /**
 622  * g_win32_get_package_installation_directory:
 623  * @package: An identifier for a software package, or %NULL
 624  * @dll_name: The name of a DLL that a package provides, or %NULL.
 625  *
 626  * Try to determine the installation directory for a software package.
 627  * Typically used by GNU software packages.
 628  *
 629  * @package should be a short identifier for the package. Typically it
 630  * is the same identifier as used for
 631  * <literal>GETTEXT_PACKAGE</literal> in software configured according
 632  * to GNU standards. The function first looks in the Windows Registry
 633  * for the value <literal>&num;InstallationDirectory</literal> in the key
 634  * <literal>&num;HKLM\Software\@package</literal>, and if that value
 635  * exists and is a string, returns that.
 636  *
 637  * If @package is %NULL, or the above value isn't found in the
 638  * Registry, but @dll_name is non-%NULL, it should name a DLL loaded
 639  * into the current process. Typically that would be the name of the
 640  * DLL calling this function, looking for its installation
 641  * directory. The function then asks Windows what directory that DLL
 642  * was loaded from. If that directory's last component is "bin" or
 643  * "lib", the parent directory is returned, otherwise the directory
 644  * itself. If that DLL isn't loaded, the function proceeds as if
 645  * @dll_name was %NULL.
 646  *
 647  * If both @package and @dll_name are %NULL, the directory from where
 648  * the main executable of the process was loaded is uses instead in
 649  * the same way as above.
 650  *
 651  * Returns: a string containing the installation directory for @package.
 652  * The return value should be freed with g_free() when not needed any longer.
 653  **/
 654
 655 gchar *
 656 g_win32_get_package_installation_directory (gchar *package,
 657                                             gchar *dll_name)
 658 {
 659   static GHashTable *package_dirs = NULL;
 660   G_LOCK_DEFINE_STATIC (package_dirs);
 661   gchar *result = NULL;
 662   gchar *key;
 663   HKEY reg_key = NULL;
 664   DWORD type;
 665   DWORD nbytes;
 666
 667   if (package != NULL)
 668     {
 669       G_LOCK (package_dirs);
 670
 671       if (package_dirs == NULL)
 672         package_dirs = g_hash_table_new (g_str_hash, g_str_equal);
 673
 674       result = g_hash_table_lookup (package_dirs, package);
 675
 676       if (result && result[0])
 677         {
 678           G_UNLOCK (package_dirs);
 679           return g_strdup (result);
 680         }
 681
 682       key = g_strconcat ("Software\\", package, NULL);
 683
 684       nbytes = 0;
 685       if ((RegOpenKeyEx (HKEY_CURRENT_USER, key, 0,
 686                          KEY_QUERY_VALUE, &reg_key) == ERROR_SUCCESS
 687            && RegQueryValueEx (reg_key, "InstallationDirectory", 0,
 688                                &type, NULL, &nbytes) == ERROR_SUCCESS)
 689           ||
 690           ((RegOpenKeyEx (HKEY_LOCAL_MACHINE, key, 0,
 691                          KEY_QUERY_VALUE, &reg_key) == ERROR_SUCCESS
 692            && RegQueryValueEx (reg_key, "InstallationDirectory", 0,
 693                                &type, NULL, &nbytes) == ERROR_SUCCESS)
 694            && type == REG_SZ))
 695         {
 696           result = g_malloc (nbytes + 1);
 697           RegQueryValueEx (reg_key, "InstallationDirectory", 0,
 698                            &type, result, &nbytes);
 699           result[nbytes] = '\0';
 700         }
 701
 702       if (reg_key != NULL)
 703         RegCloseKey (reg_key);
 704
 705       g_free (key);
 706
 707       if (result)
 708         {
 709           g_hash_table_insert (package_dirs, package, result);
 710           G_UNLOCK (package_dirs);
 711           return g_strdup (result);
 712         }
 713       G_UNLOCK (package_dirs);
 714     }
 715
 716   if (dll_name != NULL)
 717     result = get_package_directory_from_module (dll_name);
 718
 719   if (result == NULL)
 720     result = get_package_directory_from_module (NULL);
 721
 722   return result;
 723 }
 724
 725 /**
 726  * g_win32_get_package_installation_subdirectory:
 727  * @package: An identifier for a software package, or %NULL.
 728  * @dll_name: The name of a DLL that a package provides, or %NULL.
 729  * @subdir: A subdirectory of the package installation directory.
 730  *
 731  * Returns a newly-allocated string containing the path of the
 732  * subdirectory @subdir in the return value from calling
 733  * g_win32_get_package_installation_directory() with the @package and
 734  * @dll_name parameters.
 735  *
 736  * Returns: a string containing the complete path to @subdir inside the
 737  * installation directory of @package. The return value should be freed with
 738  * g_free() when no longer needed.
 739  **/
 740
 741 gchar *
 742 g_win32_get_package_installation_subdirectory (gchar *package,
 743                                                gchar *dll_name,
 744                                                gchar *subdir)
 745 {
 746   gchar *prefix;
 747
 748   prefix = g_win32_get_package_installation_directory (package, dll_name);
 749
 750   return g_build_filename (prefix, subdir, NULL);
 751 }