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 #ifdef HAVE_CONFIG_H
  33 #include <config.h>
  34 #endif
  35
  36 #include "glibconfig.h"
  37
  38 #include <stdlib.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <errno.h>
  42
  43 #define STRICT                  /* Strict typing, please */
  44 #include <windows.h>
  45 #undef STRICT
  46 #ifndef G_WITH_CYGWIN
  47 #include <direct.h>
  48 #endif
  49 #include <errno.h>
  50 #include <ctype.h>
  51 #ifdef _MSC_VER
  52 #  include <io.h>
  53 #endif /* _MSC_VER */
  54
  55 #include "glib.h"
  56
  57 #ifdef G_WITH_CYGWIN
  58 #include <sys/cygwin.h>
  59 #endif
  60
  61 #ifndef G_WITH_CYGWIN
  62
  63 gint
  64 g_win32_ftruncate (gint  fd,
  65                    guint size)
  66 {
  67   HANDLE hfile;
  68   guint curpos;
  69
  70   g_return_val_if_fail (fd >= 0, -1);
  71
  72   hfile = (HANDLE) _get_osfhandle (fd);
  73   curpos = SetFilePointer (hfile, 0, NULL, FILE_CURRENT);
  74   if (curpos == 0xFFFFFFFF
  75       || SetFilePointer (hfile, size, NULL, FILE_BEGIN) == 0xFFFFFFFF
  76       || !SetEndOfFile (hfile))
  77     {
  78       gint error = GetLastError ();
  79
  80       switch (error)
  81         {
  82         case ERROR_INVALID_HANDLE:
  83           errno = EBADF;
  84           break;
  85         default:
  86           errno = EIO;
  87           break;
  88         }
  89
  90       return -1;
  91     }
  92
  93   return 0;
  94 }
  95
  96 #endif
  97
  98 /**
  99  * g_win32_getlocale:
 100  *
 101  * The setlocale in the Microsoft C library uses locale names of the
 102  * form "English_United States.1252" etc. We want the Unixish standard
 103  * form "en_US", "zh_TW" etc. This function gets the current thread
 104  * locale from Windows - without any encoding info - and returns it as
 105  * a string of the above form for use in forming file names etc. The
 106  * returned string should be deallocated with g_free().
 107  *
 108  * Returns: newly-allocated locale name.
 109  **/
 110
 111 gchar *
 112 g_win32_getlocale (void)
 113 {
 114   LCID lcid;
 115   LANGID langid;
 116   gchar *ev;
 117   gint primary, sub;
 118   gchar *l = NULL, *sl = NULL;
 119   gchar bfr[20];
 120
 121   /* Let the user override the system settings through environment
 122      variables, as on POSIX systems.  */
 123   if (((ev = getenv ("LC_ALL")) != NULL && ev[0] != '\0')
 124       || ((ev = getenv ("LC_MESSAGES")) != NULL && ev[0] != '\0')
 125       || ((ev = getenv ("LANG")) != NULL && ev[0] != '\0'))
 126     return g_strdup (ev);
 127
 128   /* Use native Win32 API locale ID.  */
 129   lcid = GetThreadLocale ();
 130
 131   /* Strip off the sorting rules, keep only the language part.  */
 132   langid = LANGIDFROMLCID (lcid);
 133
 134   /* Split into language and territory part.  */
 135   primary = PRIMARYLANGID (langid);
 136   sub = SUBLANGID (langid);
 137   switch (primary)
 138     {
 139     case LANG_AFRIKAANS: l = "af"; sl = "ZA"; break;
 140     case LANG_ALBANIAN: l = "sq"; sl = "AL"; break;
 141     case LANG_ARABIC:
 142       l = "ar";
 143       switch (sub)
 144         {
 145         case SUBLANG_ARABIC_SAUDI_ARABIA: sl = "SA"; break;
 146         case SUBLANG_ARABIC_IRAQ: sl = "IQ"; break;
 147         case SUBLANG_ARABIC_EGYPT: sl = "EG"; break;
 148         case SUBLANG_ARABIC_LIBYA: sl = "LY"; break;
 149         case SUBLANG_ARABIC_ALGERIA: sl = "DZ"; break;
 150         case SUBLANG_ARABIC_MOROCCO: sl = "MA"; break;
 151         case SUBLANG_ARABIC_TUNISIA: sl = "TN"; break;
 152         case SUBLANG_ARABIC_OMAN: sl = "OM"; break;
 153         case SUBLANG_ARABIC_YEMEN: sl = "YE"; break;
 154         case SUBLANG_ARABIC_SYRIA: sl = "SY"; break;
 155         case SUBLANG_ARABIC_JORDAN: sl = "JO"; break;
 156         case SUBLANG_ARABIC_LEBANON: sl = "LB"; break;
 157         case SUBLANG_ARABIC_KUWAIT: sl = "KW"; break;
 158         case SUBLANG_ARABIC_UAE: sl = "AE"; break;
 159         case SUBLANG_ARABIC_BAHRAIN: sl = "BH"; break;
 160         case SUBLANG_ARABIC_QATAR: sl = "QA"; break;
 161         }
 162       break;
 163 #ifdef LANG_ARMENIAN
 164     case LANG_ARMENIAN: l = "hy"; sl = "AM"; break;
 165 #endif
 166 #ifdef LANG_ASSAMESE
 167     case LANG_ASSAMESE: l = "as"; sl = "IN"; break;
 168 #endif
 169 #ifdef LANG_AZERI
 170     case LANG_AZERI:
 171       l = "az";
 172 #if defined (SUBLANG_AZERI_LATIN) && defined (SUBLANG_AZERI_CYRILLIC)
 173       switch (sub)
 174         {
 175         /* FIXME: Adjust this when Azerbaijani locales appear on Unix.  */
 176         case SUBLANG_AZERI_LATIN: sl = "@latin"; break;
 177         case SUBLANG_AZERI_CYRILLIC: sl = "@cyrillic"; break;
 178         }
 179 #endif
 180       break;
 181 #endif
 182     case LANG_BASQUE:
 183       l = "eu"; /* sl could be "ES" or "FR".  */
 184       break;
 185     case LANG_BELARUSIAN: l = "be"; sl = "BY"; break;
 186 #ifdef LANG_BENGALI
 187     case LANG_BENGALI: l = "bn"; sl = "IN"; break;
 188 #endif
 189     case LANG_BULGARIAN: l = "bg"; sl = "BG"; break;
 190     case LANG_CATALAN: l = "ca"; sl = "ES"; break;
 191     case LANG_CHINESE:
 192       l = "zh";
 193       switch (sub)
 194         {
 195         case SUBLANG_CHINESE_TRADITIONAL: sl = "TW"; break;
 196         case SUBLANG_CHINESE_SIMPLIFIED: sl = "CN"; break;
 197         case SUBLANG_CHINESE_HONGKONG: sl = "HK"; break;
 198         case SUBLANG_CHINESE_SINGAPORE: sl = "SG"; break;
 199 #ifdef SUBLANG_CHINESE_MACAU
 200         case SUBLANG_CHINESE_MACAU: sl = "MO"; break;
 201 #endif
 202         }
 203       break;
 204     case LANG_CROATIAN:         /* LANG_CROATIAN == LANG_SERBIAN
 205                                  * What used to be called Serbo-Croatian
 206                                  * should really now be two separate
 207                                  * languages because of political reasons.
 208                                  * (Says tml, who knows nothing about Serbian
 209                                  * or Croatian.)
 210                                  * (I can feel those flames coming already.)
 211                                  */
 212       switch (sub)
 213         {
 214         /* FIXME: How to distinguish Croatian and Latin Serbian locales?  */
 215         case SUBLANG_SERBIAN_LATIN: l = "sr"; break;
 216         case SUBLANG_SERBIAN_CYRILLIC: l = "sr"; sl = "@cyrillic"; break;
 217         default: l = "hr"; sl = "HR";
 218         }
 219       break;
 220     case LANG_CZECH: l = "cs"; sl = "CZ"; break;
 221     case LANG_DANISH: l = "da"; sl = "DK"; break;
 222 #ifdef LANG_DIVEHI
 223     case LANG_DIVEHI: l = "div"; sl = "MV"; break;
 224 #endif
 225     case LANG_DUTCH:
 226       l = "nl";
 227       switch (sub)
 228         {
 229         case SUBLANG_DUTCH: sl = "NL"; break;
 230         case SUBLANG_DUTCH_BELGIAN: sl = "BE"; break;
 231         }
 232       break;
 233     case LANG_ENGLISH:
 234       l = "en";
 235       switch (sub)
 236         {
 237         case SUBLANG_ENGLISH_US: sl = "US"; break;
 238         case SUBLANG_ENGLISH_UK: sl = "GB"; break;
 239         case SUBLANG_ENGLISH_AUS: sl = "AU"; break;
 240         case SUBLANG_ENGLISH_CAN: sl = "CA"; break;
 241         case SUBLANG_ENGLISH_NZ: sl = "NZ"; break;
 242         case SUBLANG_ENGLISH_EIRE: sl = "IE"; break;
 243         case SUBLANG_ENGLISH_SOUTH_AFRICA: sl = "ZA"; break;
 244         case SUBLANG_ENGLISH_JAMAICA: sl = "JM"; break;
 245         case SUBLANG_ENGLISH_CARIBBEAN: sl = "GD"; break; /* Grenada? */
 246         case SUBLANG_ENGLISH_BELIZE: sl = "BZ"; break;
 247         case SUBLANG_ENGLISH_TRINIDAD: sl = "TT"; break;
 248 #ifdef SUBLANG_ENGLISH_ZIMBABWE
 249         case SUBLANG_ENGLISH_ZIMBABWE: sl = "ZW"; break;
 250 #endif
 251 #ifdef SUBLANG_ENGLISH_PHILIPPINES
 252         case SUBLANG_ENGLISH_PHILIPPINES: sl = "PH"; break;
 253 #endif
 254         }
 255       break;
 256     case LANG_ESTONIAN: l = "et"; sl = "EE"; break;
 257     case LANG_FAEROESE: l = "fo"; sl = "FO"; break;
 258     case LANG_FARSI: l = "fa"; sl = "IR"; break;
 259     case LANG_FINNISH: l = "fi"; sl = "FI"; break;
 260     case LANG_FRENCH:
 261       l = "fr";
 262       switch (sub)
 263         {
 264         case SUBLANG_FRENCH: sl = "FR"; break;
 265         case SUBLANG_FRENCH_BELGIAN: sl = "BE"; break;
 266         case SUBLANG_FRENCH_CANADIAN: sl = "CA"; break;
 267         case SUBLANG_FRENCH_SWISS: sl = "CH"; break;
 268         case SUBLANG_FRENCH_LUXEMBOURG: sl = "LU"; break;
 269 #ifdef SUBLANG_FRENCH_MONACO
 270         case SUBLANG_FRENCH_MONACO: sl = "MC"; break;
 271 #endif
 272         }
 273       break;
 274       /* FIXME: LANG_GALICIAN: What's the code for Galician? */
 275 #ifdef LANG_GEORGIAN
 276     case LANG_GEORGIAN: l = "ka"; sl = "GE"; break;
 277 #endif
 278     case LANG_GERMAN:
 279       l = "de";
 280       switch (sub)
 281         {
 282         case SUBLANG_GERMAN: sl = "DE"; break;
 283         case SUBLANG_GERMAN_SWISS: sl = "CH"; break;
 284         case SUBLANG_GERMAN_AUSTRIAN: sl = "AT"; break;
 285         case SUBLANG_GERMAN_LUXEMBOURG: sl = "LU"; break;
 286         case SUBLANG_GERMAN_LIECHTENSTEIN: sl = "LI"; break;
 287         }
 288       break;
 289     case LANG_GREEK: l = "el"; sl = "GR"; break;
 290 #ifdef LANG_GUJARATI
 291     case LANG_GUJARATI: l = "gu"; sl = "IN"; break;
 292 #endif
 293     case LANG_HEBREW: l = "he"; sl = "IL"; break;
 294 #ifdef LANG_HINDI
 295     case LANG_HINDI: l = "hi"; sl = "IN"; break;
 296 #endif
 297     case LANG_HUNGARIAN: l = "hu"; sl = "HU"; break;
 298     case LANG_ICELANDIC: l = "is"; sl = "IS"; break;
 299     case LANG_INDONESIAN: l = "id"; sl = "ID"; break;
 300     case LANG_ITALIAN:
 301       l = "it";
 302       switch (sub)
 303         {
 304         case SUBLANG_ITALIAN: sl = "IT"; break;
 305         case SUBLANG_ITALIAN_SWISS: sl = "CH"; break;
 306         }
 307       break;
 308     case LANG_JAPANESE: l = "ja"; sl = "JP"; break;
 309 #ifdef LANG_KANNADA
 310     case LANG_KANNADA: l = "kn"; sl = "IN"; break;
 311 #endif
 312 #ifdef LANG_KASHMIRI
 313     case LANG_KASHMIRI:
 314       l = "ks";
 315       switch (sub)
 316         {
 317         case SUBLANG_DEFAULT: sl = "PK"; break;
 318 #ifdef SUBLANG_KASHMIRI_INDIA
 319         case SUBLANG_KASHMIRI_INDIA: sl = "IN"; break;
 320 #endif
 321         }
 322       break;
 323 #endif
 324 #ifdef LANG_KAZAK
 325     case LANG_KAZAK: l = "kk"; sl = "KZ"; break;
 326 #endif
 327 #ifdef LANG_KONKANI
 328     case LANG_KONKANI:
 329       /* FIXME: Adjust this when such locales appear on Unix.  */
 330       l = "kok"; sl = "IN";
 331       break;
 332 #endif
 333     case LANG_KOREAN: l = "ko"; sl = "KR"; break;
 334 #ifdef LANG_KYRGYZ
 335     case LANG_KYRGYZ: l = "ky"; sl = "KG"; /* ??? */ break;
 336 #endif
 337     case LANG_LATVIAN: l = "lv"; sl = "LV"; break;
 338     case LANG_LITHUANIAN: l = "lt"; sl = "LT"; break;
 339 #ifdef LANG_MACEDONIAN
 340     case LANG_MACEDONIAN: l = "mk"; sl = "MK"; break;
 341 #endif
 342 #ifdef LANG_MALAY
 343     case LANG_MALAY:
 344       l = "ms";
 345       switch (sub)
 346         {
 347 #ifdef SUBLANG_MALAY_MALAYSIA
 348         case SUBLANG_MALAY_MALAYSIA: sl = "MY"; break;
 349 #endif
 350 #ifdef SUBLANG_MALAY_BRUNEI_DARUSSALAM
 351         case SUBLANG_MALAY_BRUNEI_DARUSSALAM: sl = "BN"; break;
 352 #endif
 353         }
 354       break;
 355 #endif
 356 #ifdef LANG_MALAYALAM
 357     case LANG_MALAYALAM: l = "ml"; sl = "IN"; break;
 358 #endif
 359 #ifdef LANG_MANIPURI
 360     case LANG_MANIPURI:
 361       /* FIXME: Adjust this when such locales appear on Unix.  */
 362       l = "mni"; sl = "IN";
 363       break;
 364 #endif
 365 #ifdef LANG_MARATHI
 366     case LANG_MARATHI: l = "mr"; sl = "IN"; break;
 367 #endif
 368 #ifdef LANG_MONGOLIAN
 369     case LANG_MONGOLIAN: l = "mn"; sl = "MN"; break;
 370 #endif
 371 #ifdef LANG_NEPALI
 372     case LANG_NEPALI:
 373       l = "ne";
 374       switch (sub)
 375         {
 376         case SUBLANG_DEFAULT: sl = "NP"; break;
 377 #ifdef SUBLANG_NEPALI_INDIA
 378         case SUBLANG_NEPALI_INDIA: sl = "IN"; break;
 379 #endif
 380         }
 381       break;
 382 #endif
 383     case LANG_NORWEGIAN:
 384       l = "no";
 385       switch (sub)
 386         {
 387         case SUBLANG_NORWEGIAN_BOKMAL: sl = "NO"; break;
 388         case SUBLANG_NORWEGIAN_NYNORSK: l = "nn"; sl = "NO"; break;
 389         }
 390       break;
 391 #ifdef LANG_ORIYA
 392     case LANG_ORIYA: l = "or"; sl = "IN"; break;
 393 #endif
 394     case LANG_POLISH: l = "pl"; sl = "PL"; break;
 395     case LANG_PORTUGUESE:
 396       l = "pt";
 397       switch (sub)
 398         {
 399         case SUBLANG_PORTUGUESE: sl = "PT"; break;
 400         case SUBLANG_PORTUGUESE_BRAZILIAN: sl = "BR"; break;
 401         }
 402       break;
 403 #ifdef LANG_PUNJABI
 404     case LANG_PUNJABI: l = "pa"; sl = "IN"; break;
 405 #endif
 406     case LANG_ROMANIAN: l = "ro"; sl = "RO"; break;
 407     case LANG_RUSSIAN:
 408       l = "ru"; /* sl could be "RU" or "UA".  */
 409       break;
 410 #ifdef LANG_SANSKRIT
 411     case LANG_SANSKRIT: l = "sa"; sl = "IN"; break;
 412 #endif
 413 #ifdef LANG_SINDHI
 414     case LANG_SINDHI: l = "sd"; break;
 415 #endif
 416     case LANG_SLOVAK: l = "sk"; sl = "SK"; break;
 417     case LANG_SLOVENIAN: l = "sl"; sl = "SI"; break;
 418 #ifdef LANG_SORBIAN
 419     case LANG_SORBIAN:
 420       /* FIXME: Adjust this when such locales appear on Unix.  */
 421       l = "wen"; sl = "DE";
 422       break;
 423 #endif
 424     case LANG_SPANISH:
 425       l = "es";
 426       switch (sub)
 427         {
 428         case SUBLANG_SPANISH: sl = "ES"; break;
 429         case SUBLANG_SPANISH_MEXICAN: sl = "MX"; break;
 430         case SUBLANG_SPANISH_MODERN:
 431           sl = "ES@modern"; break;      /* not seen on Unix */
 432         case SUBLANG_SPANISH_GUATEMALA: sl = "GT"; break;
 433         case SUBLANG_SPANISH_COSTA_RICA: sl = "CR"; break;
 434         case SUBLANG_SPANISH_PANAMA: sl = "PA"; break;
 435         case SUBLANG_SPANISH_DOMINICAN_REPUBLIC: sl = "DO"; break;
 436         case SUBLANG_SPANISH_VENEZUELA: sl = "VE"; break;
 437         case SUBLANG_SPANISH_COLOMBIA: sl = "CO"; break;
 438         case SUBLANG_SPANISH_PERU: sl = "PE"; break;
 439         case SUBLANG_SPANISH_ARGENTINA: sl = "AR"; break;
 440         case SUBLANG_SPANISH_ECUADOR: sl = "EC"; break;
 441         case SUBLANG_SPANISH_CHILE: sl = "CL"; break;
 442         case SUBLANG_SPANISH_URUGUAY: sl = "UY"; break;
 443         case SUBLANG_SPANISH_PARAGUAY: sl = "PY"; break;
 444         case SUBLANG_SPANISH_BOLIVIA: sl = "BO"; break;
 445         case SUBLANG_SPANISH_EL_SALVADOR: sl = "SV"; break;
 446         case SUBLANG_SPANISH_HONDURAS: sl = "HN"; break;
 447         case SUBLANG_SPANISH_NICARAGUA: sl = "NI"; break;
 448         case SUBLANG_SPANISH_PUERTO_RICO: sl = "PR"; break;
 449         }
 450       break;
 451 #ifdef LANG_SWAHILI
 452     case LANG_SWAHILI: l = "sw"; break;
 453 #endif
 454     case LANG_SWEDISH:
 455       l = "sv";
 456       switch (sub)
 457         {
 458         case SUBLANG_DEFAULT: sl = "SE"; break;
 459         case SUBLANG_SWEDISH_FINLAND: sl = "FI"; break;
 460         }
 461       break;
 462 #ifdef LANG_SYRIAC
 463     case LANG_SYRIAC: l = "syr"; break;
 464 #endif
 465 #ifdef LANG_TAMIL
 466     case LANG_TAMIL:
 467       l = "ta"; /* sl could be "IN" or "LK".  */
 468       break;
 469 #endif
 470 #ifdef LANG_TATAR
 471     case LANG_TATAR: l = "tt"; break;
 472 #endif
 473 #ifdef LANG_TELUGU
 474     case LANG_TELUGU: l = "te"; sl = "IN"; break;
 475 #endif
 476     case LANG_THAI: l = "th"; sl = "TH"; break;
 477     case LANG_TURKISH: l = "tr"; sl = "TR"; break;
 478     case LANG_UKRAINIAN: l = "uk"; sl = "UA"; break;
 479 #ifdef LANG_URDU
 480     case LANG_URDU:
 481       l = "ur";
 482       switch (sub)
 483         {
 484 #ifdef SUBLANG_URDU_PAKISTAN
 485         case SUBLANG_URDU_PAKISTAN: sl = "PK"; break;
 486 #endif
 487 #ifdef SUBLANG_URDU_INDIA
 488         case SUBLANG_URDU_INDIA: sl = "IN"; break;
 489 #endif
 490         }
 491       break;
 492 #endif
 493 #ifdef LANG_UZBEK
 494     case LANG_UZBEK:
 495       l = "uz";
 496       switch (sub)
 497         {
 498         /* FIXME: Adjust this when Uzbek locales appear on Unix.  */
 499 #ifdef SUBLANG_UZBEK_LATIN
 500         case SUBLANG_UZBEK_LATIN: sl = "UZ@latin"; break;
 501 #endif
 502 #ifdef SUBLANG_UZBEK_CYRILLIC
 503         case SUBLANG_UZBEK_CYRILLIC: sl = "UZ@cyrillic"; break;
 504 #endif
 505         }
 506       break;
 507 #endif
 508     case LANG_VIETNAMESE: l = "vi"; sl = "VN"; break;
 509     default: l = "xx"; break;
 510     }
 511   strcpy (bfr, l);
 512   if (sl != NULL)
 513     {
 514       if (sl[0] != '@')
 515         strcat (bfr, "_");
 516       strcat (bfr, sl);
 517     }
 518
 519   return g_strdup (bfr);
 520 }
 521
 522 /**
 523  * g_win32_error_message:
 524  * @error: error code.
 525  *
 526  * Translate a Win32 error code (as returned by GetLastError()) into
 527  * the corresponding message. The message is either language neutral,
 528  * or in the thread's language, or the user's language, the system's
 529  * language, or US English (see docs for <function>FormatMessage()</function>). *
 530  * The returned string should be deallocated with g_free().
 531  *
 532  * Returns: newly-allocated error message
 533  **/
 534 gchar *
 535 g_win32_error_message (gint error)
 536 {
 537   gchar *msg;
 538   gchar *retval;
 539   int nbytes;
 540
 541   FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER
 542                  |FORMAT_MESSAGE_IGNORE_INSERTS
 543                  |FORMAT_MESSAGE_FROM_SYSTEM,
 544                  NULL, error, 0,
 545                  (LPTSTR) &msg, 0, NULL);
 546   nbytes = strlen (msg);
 547
 548   if (nbytes > 2 && msg[nbytes-1] == '\n' && msg[nbytes-2] == '\r')
 549     msg[nbytes-2] = '\0';
 550
 551   retval = g_strdup (msg);
 552
 553   if (msg != NULL)
 554     LocalFree (msg);
 555
 556   return retval;
 557 }
 558
 559 static gchar *
 560 get_package_directory_from_module (gchar *module_name)
 561 {
 562   static GHashTable *module_dirs = NULL;
 563   G_LOCK_DEFINE_STATIC (module_dirs);
 564   HMODULE hmodule = NULL;
 565   gchar *fn;
 566   gchar *p;
 567   gchar *result;
 568
 569   G_LOCK (module_dirs);
 570
 571   if (module_dirs == NULL)
 572     module_dirs = g_hash_table_new (g_str_hash, g_str_equal);
 573
 574   result = g_hash_table_lookup (module_dirs, module_name ? module_name : "");
 575
 576   if (result)
 577     {
 578       G_UNLOCK (module_dirs);
 579       return g_strdup (result);
 580     }
 581
 582   if (module_name)
 583     {
 584       hmodule = GetModuleHandle (module_name);
 585       if (!hmodule)
 586         return NULL;
 587     }
 588
 589   fn = g_malloc (MAX_PATH);
 590   if (!GetModuleFileName (hmodule, fn, MAX_PATH))
 591     {
 592       G_UNLOCK (module_dirs);
 593       g_free (fn);
 594       return NULL;
 595     }
 596
 597   if ((p = strrchr (fn, G_DIR_SEPARATOR)) != NULL)
 598     *p = '\0';
 599
 600   p = strrchr (fn, G_DIR_SEPARATOR);
 601   if (p && (g_ascii_strcasecmp (p + 1, "bin") == 0 ||
 602             g_ascii_strcasecmp (p + 1, "lib") == 0))
 603     *p = '\0';
 604
 605 #ifdef G_WITH_CYGWIN
 606   /* In Cygwin we need to have POSIX paths */
 607   {
 608     gchar tmp[MAX_PATH];
 609
 610     cygwin_conv_to_posix_path(fn, tmp);
 611     g_free(fn);
 612     fn = g_strdup(tmp);
 613   }
 614 #endif
 615
 616   g_hash_table_insert (module_dirs, module_name ? module_name : "", fn);
 617
 618   G_UNLOCK (module_dirs);
 619
 620   return g_strdup (fn);
 621 }
 622
 623 /**
 624  * g_win32_get_package_installation_directory:
 625  * @package: An identifier for a software package, or %NULL
 626  * @dll_name: The name of a DLL that a package provides, or %NULL.
 627  *
 628  * Try to determine the installation directory for a software package.
 629  * Typically used by GNU software packages.
 630  *
 631  * @package should be a short identifier for the package. Typically it
 632  * is the same identifier as used for
 633  * <literal>GETTEXT_PACKAGE</literal> in software configured according
 634  * to GNU standards. The function first looks in the Windows Registry
 635  * for the value <literal>#InstallationDirectory</literal> in the key
 636  * <literal>#HKLM\Software\@package</literal>, and if that value
 637  * exists and is a string, returns that.
 638  *
 639  * If @package is %NULL, or the above value isn't found in the
 640  * Registry, but @dll_name is non-%NULL, it should name a DLL loaded
 641  * into the current process. Typically that would be the name of the
 642  * DLL calling this function, looking for its installation
 643  * directory. The function then asks Windows what directory that DLL
 644  * was loaded from. If that directory's last component is "bin" or
 645  * "lib", the parent directory is returned, otherwise the directory
 646  * itself. If that DLL isn't loaded, the function proceeds as if
 647  * @dll_name was %NULL.
 648  *
 649  * If both @package and @dll_name are %NULL, the directory from where
 650  * the main executable of the process was loaded is uses instead in
 651  * the same way as above.
 652  *
 653  * Returns: a string containing the installation directory for @package.
 654  * The return value should be freed with g_free() when not needed any longer.
 655  **/
 656
 657 gchar *
 658 g_win32_get_package_installation_directory (gchar *package,
 659                                             gchar *dll_name)
 660 {
 661   static GHashTable *package_dirs = NULL;
 662   G_LOCK_DEFINE_STATIC (package_dirs);
 663   gchar *result = NULL;
 664   gchar *key;
 665   HKEY reg_key = NULL;
 666   DWORD type;
 667   DWORD nbytes;
 668
 669   if (package != NULL)
 670     {
 671       G_LOCK (package_dirs);
 672
 673       if (package_dirs == NULL)
 674         package_dirs = g_hash_table_new (g_str_hash, g_str_equal);
 675
 676       result = g_hash_table_lookup (package_dirs, package);
 677
 678       if (result && result[0])
 679         {
 680           G_UNLOCK (package_dirs);
 681           return g_strdup (result);
 682         }
 683
 684       key = g_strconcat ("Software\\", package, NULL);
 685
 686       nbytes = 0;
 687       if ((RegOpenKeyEx (HKEY_CURRENT_USER, key, 0,
 688                          KEY_QUERY_VALUE, &reg_key) == ERROR_SUCCESS
 689            && RegQueryValueEx (reg_key, "InstallationDirectory", 0,
 690                                &type, NULL, &nbytes) == ERROR_SUCCESS)
 691           ||
 692           ((RegOpenKeyEx (HKEY_LOCAL_MACHINE, key, 0,
 693                          KEY_QUERY_VALUE, &reg_key) == ERROR_SUCCESS
 694            && RegQueryValueEx (reg_key, "InstallationDirectory", 0,
 695                                &type, NULL, &nbytes) == ERROR_SUCCESS)
 696            && type == REG_SZ))
 697         {
 698           result = g_malloc (nbytes + 1);
 699           RegQueryValueEx (reg_key, "InstallationDirectory", 0,
 700                            &type, result, &nbytes);
 701           result[nbytes] = '\0';
 702         }
 703
 704       if (reg_key != NULL)
 705         RegCloseKey (reg_key);
 706
 707       g_free (key);
 708
 709       if (result)
 710         {
 711           g_hash_table_insert (package_dirs, package, result);
 712           G_UNLOCK (package_dirs);
 713           return g_strdup (result);
 714         }
 715       G_UNLOCK (package_dirs);
 716     }
 717
 718   if (dll_name != NULL)
 719     result = get_package_directory_from_module (dll_name);
 720
 721   if (result == NULL)
 722     result = get_package_directory_from_module (NULL);
 723
 724   return result;
 725 }
 726
 727 /**
 728  * g_win32_get_package_installation_subdirectory:
 729  * @package: An identifier for a software package, or %NULL.
 730  * @dll_name: The name of a DLL that a package provides, or %NULL.
 731  * @subdir: A subdirectory of the package installation directory.
 732  *
 733  * Returns a newly-allocated string containing the path of the
 734  * subdirectory @subdir in the return value from calling
 735  * g_win32_get_package_installation_directory() with the @package and
 736  * @dll_name parameters.
 737  *
 738  * Returns: a string containing the complete path to @subdir inside the
 739  * installation directory of @package. The return value should be freed with
 740  * g_free() when no longer needed.
 741  **/
 742
 743 gchar *
 744 g_win32_get_package_installation_subdirectory (gchar *package,
 745                                                gchar *dll_name,
 746                                                gchar *subdir)
 747 {
 748   gchar *prefix;
 749
 750   prefix = g_win32_get_package_installation_directory (package, dll_name);
 751
 752   return g_build_filename (prefix, subdir, NULL);
 753 }