1 /* 2 * Source file for missing WinCE functionality 3 * Copyright 2012 RealVNC Ltd. 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 2.1 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 Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 #include "missing.h" 21 22 #include <config.h> 23 #include <libusbi.h> 24 25 #include <windows.h> 26 27 // The registry path to store environment variables 28 #define ENVIRONMENT_REG_PATH _T("Software\\libusb\\environment") 29 30 /* Workaround getenv not being available on WinCE. 31 * Instead look in HKLM\Software\libusb\environment */ 32 char *getenv(const char *name) 33 { 34 static char value[MAX_PATH]; 35 TCHAR wValue[MAX_PATH]; 36 WCHAR wName[MAX_PATH]; 37 DWORD dwType, dwData; 38 HKEY hkey; 39 LONG rc; 40 41 if (!name) 42 return NULL; 43 44 if (MultiByteToWideChar(CP_UTF8, 0, name, -1, wName, MAX_PATH) <= 0) { 45 usbi_dbg("Failed to convert environment variable name to wide string"); 46 return NULL; 47 } 48 wName[MAX_PATH - 1] = 0; // Be sure it's NUL terminated 49 50 rc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, ENVIRONMENT_REG_PATH, 0, KEY_QUERY_VALUE, &hkey); 51 if (rc != ERROR_SUCCESS) { 52 usbi_dbg("Failed to open registry key for getenv with error %d", rc); 53 return NULL; 54 } 55 56 // Attempt to read the key 57 dwData = sizeof(wValue); 58 rc = RegQueryValueEx(hkey, wName, NULL, &dwType, 59 (LPBYTE)&wValue, &dwData); 60 RegCloseKey(hkey); 61 if (rc != ERROR_SUCCESS) { 62 usbi_dbg("Failed to read registry key value for getenv with error %d", rc); 63 return NULL; 64 } 65 if (dwType != REG_SZ) { 66 usbi_dbg("Registry value was of type %d instead of REG_SZ", dwType); 67 return NULL; 68 } 69 70 // Success in reading the key, convert from WCHAR to char 71 if (WideCharToMultiByte(CP_UTF8, 0, 72 wValue, dwData / sizeof(*wValue), 73 value, MAX_PATH, 74 NULL, NULL) <= 0) { 75 usbi_dbg("Failed to convert environment variable value to narrow string"); 76 return NULL; 77 } 78 value[MAX_PATH - 1] = 0; // Be sure it's NUL terminated 79 return value; 80 } 81
