cppuhelper/source/findsofficepath.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/config.h>
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include <cppuhelper/findsofficepath.h>
  26
  27 #if defined(_WIN32)
  28
  29 #define WIN32_LEAN_AND_MEAN
  30 #include <windows.h>
  31
  32 /*
  33  * Gets the installation path from the Windows Registry for the specified
  34  * registry key.
  35  *
  36  * @param hroot       open handle to predefined root registry key
  37  * @param subKeyName  name of the subkey to open
  38  *
  39  * @return the installation path or NULL, if no installation was found or
  40  *         if an error occurred
  41  */
  42 static wchar_t* getPathFromRegistryKey( HKEY hroot, const wchar_t* subKeyName )
  43 {
  44     HKEY hkey;
  45     DWORD type;
  46     wchar_t* data = NULL;
  47     DWORD size;
  48
  49     /* open the specified registry key */
  50     if ( RegOpenKeyExW( hroot, subKeyName, 0, KEY_READ, &hkey ) != ERROR_SUCCESS )
  51     {
  52         return NULL;
  53     }
  54
  55     /* find the type and size of the default value */
  56     if ( RegQueryValueExW( hkey, NULL, NULL, &type, NULL, &size) != ERROR_SUCCESS )
  57     {
  58         RegCloseKey( hkey );
  59         return NULL;
  60     }
  61
  62     /* get memory to hold the default value */
  63     data = (wchar_t*) malloc( size + sizeof(wchar_t) );
  64
  65     /* read the default value */
  66     if ( RegQueryValueExW( hkey, NULL, NULL, &type, (LPBYTE) data, &size ) != ERROR_SUCCESS )
  67     {
  68         RegCloseKey( hkey );
  69         free( data );
  70         return NULL;
  71     }
  72
  73     // According to https://msdn.microsoft.com/en-us/ms724911, If the data has the REG_SZ,
  74     // REG_MULTI_SZ or REG_EXPAND_SZ type, the string may not have been stored with the
  75     // proper terminating null characters
  76     data[size / sizeof(wchar_t)] = 0;
  77
  78     /* release registry key handle */
  79     RegCloseKey( hkey );
  80
  81     return data;
  82 }
  83
  84 /*
  85  * Gets the installation path from the Windows Registry.
  86  *
  87  * @return the installation path or NULL, if no installation was found or
  88  *         if an error occurred
  89  */
  90 static wchar_t* platformSpecific(void)
  91 {
  92     const wchar_t* UNOPATHVARNAME = L"UNO_PATH";
  93
  94     /* get the installation path from the UNO_PATH environment variable */
  95     wchar_t* env = _wgetenv(UNOPATHVARNAME);
  96
  97     if (env && env[0])
  98     {
  99         return wcsdup(env);
 100     }
 101
 102     const wchar_t* SUBKEYNAME = L"Software\\LibreOffice\\UNO\\InstallPath";
 103
 104     /* read the key's default value from HKEY_CURRENT_USER */
 105     wchar_t* path = getPathFromRegistryKey( HKEY_CURRENT_USER, SUBKEYNAME );
 106
 107     if ( path == NULL )
 108     {
 109         /* read the key's default value from HKEY_LOCAL_MACHINE */
 110         path = getPathFromRegistryKey( HKEY_LOCAL_MACHINE, SUBKEYNAME );
 111     }
 112
 113     return path;
 114 }
 115
 116 #else
 117
 118 #include <limits.h>
 119
 120 /*
 121  * Gets the installation path from the PATH environment variable.
 122  *
 123  * <p>An installation is found, if the executable 'soffice' or a symbolic link
 124  * is in one of the directories listed in the PATH environment variable.</p>
 125  *
 126  * @return the installation path or NULL, if no installation was found or
 127  *         if an error occurred
 128  */
 129 static char* platformSpecific(void)
 130 {
 131     const char* UNOPATHVARNAME = "UNO_PATH";
 132
 133     /* get the installation path from the UNO_PATH environment variable */
 134     char* env = getenv(UNOPATHVARNAME);
 135
 136     const int SEPARATOR = '/';
 137     const char* PATHSEPARATOR = ":";
 138     const char* PATHVARNAME = "PATH";
 139     const char* APPENDIX = "/libreoffice";
 140
 141     char* path = NULL;
 142     char* str = NULL;
 143     char* dir = NULL;
 144     char* sep = NULL;
 145
 146     char buffer[PATH_MAX];
 147     int pos;
 148
 149     if (env && env[0])
 150     {
 151         return strdup(env);
 152     }
 153
 154     /* get the value of the PATH environment variable */
 155     env = getenv( PATHVARNAME );
 156     if (env == NULL)
 157         return NULL;
 158
 159     str = strdup( env );
 160     if (str == NULL)
 161         return NULL;
 162
 163     /* get the tokens separated by ':' */
 164     dir = strtok( str, PATHSEPARATOR );
 165
 166     while ( dir )
 167     {
 168         /* construct soffice file path */
 169         char* resolved = NULL;
 170         char* file = (char*) malloc( strlen( dir ) + strlen( APPENDIX ) + 1 );
 171         if (file == NULL)
 172         {
 173             free(str);
 174             return NULL;
 175         }
 176
 177         strcpy( file, dir );
 178         strcat( file, APPENDIX );
 179
 180         /* resolve symbolic link */
 181         resolved = realpath( file, buffer );
 182         if ( resolved != NULL )
 183         {
 184             /* get path to program directory */
 185             sep = strrchr( resolved, SEPARATOR );
 186
 187             if ( sep != NULL )
 188             {
 189                 pos = sep - resolved;
 190                 path = (char*) malloc( pos + 1 );
 191                 strncpy( path, resolved, pos );
 192                 path[ pos ] = '\0';
 193                 free( file );
 194                 break;
 195             }
 196         }
 197
 198         dir = strtok( NULL, PATHSEPARATOR );
 199         free( file );
 200     }
 201
 202     free( str );
 203
 204     return path;
 205 }
 206
 207 #endif
 208
 209 #if defined(_WIN32)
 210 wchar_t*
 211 #else
 212 char*
 213 #endif
 214 cppuhelper_detail_findSofficePath(void)
 215 {
 216     return platformSpecific();
 217 }
 218
 219 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */