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81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
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/*
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* Source file for missing WinCE functionality
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* Copyright © 2012 RealVNC Ltd.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "missing.h"
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#include <config.h>
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#include <libusbi.h>
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#include <windows.h>
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// The registry path to store environment variables
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#define ENVIRONMENT_REG_PATH _T("Software\\libusb\\environment")
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/* Workaround getenv not being available on WinCE.
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* Instead look in HKLM\Software\libusb\environment */
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char *getenv(const char *name)
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{
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static char value[MAX_PATH];
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TCHAR wValue[MAX_PATH];
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WCHAR wName[MAX_PATH];
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DWORD dwType, dwData;
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HKEY hkey;
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LONG rc;
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if (!name)
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return NULL;
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if (MultiByteToWideChar(CP_UTF8, 0, name, -1, wName, MAX_PATH) <= 0) {
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usbi_dbg("Failed to convert environment variable name to wide string");
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return NULL;
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}
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wName[MAX_PATH - 1] = 0; // Be sure it's NUL terminated
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rc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, ENVIRONMENT_REG_PATH, 0, KEY_QUERY_VALUE, &hkey);
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if (rc != ERROR_SUCCESS) {
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usbi_dbg("Failed to open registry key for getenv with error %d", rc);
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return NULL;
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}
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// Attempt to read the key
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dwData = sizeof(wValue);
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rc = RegQueryValueEx(hkey, wName, NULL, &dwType,
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(LPBYTE)&wValue, &dwData);
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RegCloseKey(hkey);
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if (rc != ERROR_SUCCESS) {
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usbi_dbg("Failed to read registry key value for getenv with error %d", rc);
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return NULL;
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}
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if (dwType != REG_SZ) {
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usbi_dbg("Registry value was of type %d instead of REG_SZ", dwType);
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return NULL;
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}
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// Success in reading the key, convert from WCHAR to char
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if (WideCharToMultiByte(CP_UTF8, 0,
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wValue, dwData / sizeof(*wValue),
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value, MAX_PATH,
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NULL, NULL) <= 0) {
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usbi_dbg("Failed to convert environment variable value to narrow string");
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return NULL;
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}
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value[MAX_PATH - 1] = 0; // Be sure it's NUL terminated
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return value;
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}
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