ref: b0546451ff5aff0eaa9c5f4fbeb1d6b0541bbdc4
dir: /src/win32-ltdl.c/
/* libSoX minimal libtool-ltdl for MS-Windows: (c) 2009 SoX contributors
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "win32-ltdl.h"
#include <stdio.h>
#include <stdlib.h>
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#ifndef _countof
#define _countof(A) (sizeof(A)/sizeof((A)[0]))
#endif
static DWORD
s_dwLastError;
static char
s_szLastError[MAX_PATH];
/* keep 1 reserved to search with empty path */
#define MAX_SEARCH_PATHS 2
static char
*s_szSearchPaths[MAX_SEARCH_PATHS];
static int
CopyPath(
const char* szSource,
char* szDest,
unsigned cchDest,
int chStop)
{
unsigned i = 0;
char ch;
if (szSource != 0 && cchDest != 0)
{
for (; i < cchDest - 1 && (ch = szSource[i]) != 0 && ch != chStop; i++)
{
if (ch == '/')
{
ch = '\\';
}
szDest[i] = ch;
}
}
szDest[i] = 0;
return i;
}
static lt_dlhandle
LoadLib(
const char* szFileName,
const char* const szExtensions[])
{
lt_dlhandle hMod = 0;
char szFull[MAX_PATH];
const char* szExt;
unsigned iPath;
unsigned iExtension;
unsigned iCur;
unsigned iEnd = 0;
if (_countof(szFileName) == 0)
{
s_dwLastError = ERROR_INVALID_PARAMETER;
goto Done;
}
for (iPath = 0; !hMod && iPath < MAX_SEARCH_PATHS; iPath++)
{
/* Only loop through 1 time when user gives absolute paths
* to prevent wasting time.
*/
if (iPath > 0 && (szFileName[0] != '/' || szFileName[0] != '\\'))
break;
/* Add search path only if non-empty and filename does not
* contain absolute path.
*/
if (s_szSearchPaths[iPath] && s_szSearchPaths[iPath][0] != 0 &&
szFileName[0] != '/' && szFileName[0] != '\\')
{
iEnd += CopyPath(s_szSearchPaths[iPath], szFull, _countof(szFull),
0);
if (szFull[iEnd-1] != '\\')
{
iEnd += CopyPath("\\", &szFull[iEnd], _countof(szFull)-iEnd, 0);
}
}
iEnd += CopyPath(szFileName, &szFull[iEnd], _countof(szFull)-iEnd, 0);
for (iExtension = 0; !hMod && szExtensions[iExtension]; iExtension++)
{
szExt = szExtensions[iExtension];
for (iCur = 0; szExt[iCur] && iEnd + iCur < _countof(szFull); iCur++)
{
szFull[iEnd + iCur] = szExt[iCur];
}
if (iEnd + iCur >= _countof(szFull))
{
s_dwLastError = ERROR_BUFFER_OVERFLOW;
goto Done;
}
else
{
szFull[iEnd + iCur] = 0;
}
hMod = (lt_dlhandle)LoadLibraryA(szFull);
}
}
s_dwLastError = hMod ? 0 : GetLastError();
Done:
return hMod;
}
int
lt_dlinit(void)
{
int cErrors = 0;
int i;
s_dwLastError = 0;
for (i = 0; i < MAX_SEARCH_PATHS; i++)
s_szSearchPaths[i] = NULL;
return cErrors;
}
int
lt_dlexit(void)
{
int cErrors = 0;
s_dwLastError = 0;
return cErrors;
}
int
lt_dlsetsearchpath(const char *search_path)
{
int cErrors=0;
/* location 0 is researched for current directory */
if (!s_szSearchPaths[1])
{
free(s_szSearchPaths[1]);
s_szSearchPaths[1] = NULL;
}
if (search_path)
s_szSearchPaths[1] = strdup(search_path);
return cErrors;
}
int
lt_dlforeachfile(
const char *szSearchPath,
int (*pfCallback)(const char *szFileName, lt_ptr pData),
lt_ptr pData)
{
char szExePath[MAX_PATH];
char szOnePath[MAX_PATH];
int cErrors = 0;
unsigned iSearchPath = 0;
unsigned iOnePath;
unsigned iExePath = 0;
unsigned cchCopied;
HANDLE hFind;
WIN32_FIND_DATAA data;
szExePath[0] = 0;
if (pfCallback == 0)
{
s_dwLastError = ERROR_INVALID_PARAMETER;
cErrors++;
goto Done;
}
if (szSearchPath != 0)
{
while (1)
{
while (szSearchPath[iSearchPath] == LT_PATHSEP_CHAR)
{
iSearchPath++;
}
if (szSearchPath[iSearchPath] == 0)
{
s_dwLastError = 0;
break;
}
if (szSearchPath[iSearchPath] == '.' &&
(szSearchPath[iSearchPath + 1] == '\\' || szSearchPath[iSearchPath + 1] == '/'))
{
if (szExePath[0] == 0)
{
iExePath = GetModuleFileNameA(0, szExePath, _countof(szExePath));
if (iExePath == 0)
{
s_dwLastError = GetLastError();
cErrors++;
goto Done;
}
else if (iExePath == _countof(szExePath))
{
s_dwLastError = ERROR_BUFFER_OVERFLOW;
cErrors++;
goto Done;
}
while (iExePath > 0 && szExePath[iExePath - 1] != '\\')
{
iExePath--;
}
if (iExePath > 0)
{
iExePath--;
}
szExePath[iExePath] = 0;
}
strcpy(szOnePath, szExePath);
iOnePath = iExePath;
iSearchPath++;
}
else
{
iOnePath = 0;
}
cchCopied = CopyPath(
szSearchPath + iSearchPath,
szOnePath + iOnePath,
_countof(szOnePath) - iOnePath,
LT_PATHSEP_CHAR);
iSearchPath += cchCopied;
iOnePath += cchCopied;
if (0 < iOnePath && iOnePath + 1 < _countof(szOnePath) && szOnePath[iOnePath - 1] != '\\')
{
szOnePath[iOnePath++] = '\\';
}
if (iOnePath + 1 >= _countof(szOnePath))
{
s_dwLastError = ERROR_BUFFER_OVERFLOW;
cErrors++;
goto Done;
}
szOnePath[iOnePath++] = '*';
szOnePath[iOnePath] = 0;
hFind = FindFirstFileA(szOnePath, &data);
while (hFind != INVALID_HANDLE_VALUE)
{
if (0 == (data.dwFileAttributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE | FILE_ATTRIBUTE_OFFLINE)))
{
cErrors = pfCallback(data.cFileName, pData);
if (cErrors)
{
s_dwLastError = ERROR_CANCELLED;
FindClose(hFind);
goto Done;
}
}
if (!FindNextFileA(hFind, &data))
{
s_dwLastError = ERROR_SUCCESS;
FindClose(hFind);
hFind = INVALID_HANDLE_VALUE;
}
}
}
}
Done:
return cErrors;
}
lt_dlhandle
lt_dlopen(
const char *szFileName)
{
const char* const szExtensions[] = { ".", 0 };
lt_dlhandle hModule = LoadLib(szFileName, szExtensions);
return hModule;
}
lt_dlhandle
lt_dlopenext(
const char *szFileName)
{
const char* const szExtensions[] = { ".", ".la.", ".dll.", 0 };
lt_dlhandle hModule = LoadLib(szFileName, szExtensions);
return hModule;
}
int
lt_dlclose(
lt_dlhandle handle)
{
int cErrors = 0;
if (FreeLibrary((HMODULE)handle))
{
s_dwLastError = 0;
}
else
{
s_dwLastError = GetLastError();
cErrors++;
}
return cErrors;
}
lt_ptr
lt_dlsym(
lt_dlhandle hModule,
const char *szSymbolName)
{
union {FARPROC fn; lt_ptr ptr;} func;
func.fn = GetProcAddress((HMODULE)hModule, szSymbolName);
s_dwLastError = func.fn ? 0 : GetLastError();
return func.ptr;
}
const char *
lt_dlerror(void)
{
if (!FormatMessageA(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
0,
s_dwLastError,
0,
s_szLastError,
_countof(s_szLastError),
0))
{
_snprintf(s_szLastError, _countof(s_szLastError), "Unknown error %u occurred.", s_dwLastError);
}
return s_szLastError;
}