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/*
* tclWinLoad.c --
*
* This function provides a version of the TclLoadFile that works with
* the Windows "LoadLibrary" and "GetProcAddress" API for dynamic
* loading.
*
* Copyright (c) 1995-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclWinLoad.c,v 1.25 2010/03/11 13:35:23 nijtmans Exp $
*/
#include "tclWinInt.h"
/*
*----------------------------------------------------------------------
*
* TclpDlopen --
*
* Dynamically loads a binary code file into memory and returns a handle
* to the new code.
*
* Results:
* A standard Tcl completion code. If an error occurs, an error message
* is left in the interp's result.
*
* Side effects:
* New code suddenly appears in memory.
*
*----------------------------------------------------------------------
*/
int
TclpDlopen(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Obj *pathPtr, /* Name of the file containing the desired
* code (UTF-8). */
Tcl_LoadHandle *loadHandle, /* Filled with token for dynamically loaded
* file which will be passed back to
* (*unloadProcPtr)() to unload the file. */
Tcl_FSUnloadFileProc **unloadProcPtr)
/* Filled with address of Tcl_FSUnloadFileProc
* function which should be used for this
* file. */
{
HINSTANCE handle;
const TCHAR *nativeName;
/*
* First try the full path the user gave us. This is particularly
* important if the cwd is inside a vfs, and we are trying to load using a
* relative path.
*/
nativeName = Tcl_FSGetNativePath(pathPtr);
handle = tclWinProcs->loadLibraryProc(nativeName);
if (handle == NULL) {
/*
* Let the OS loader examine the binary search path for whatever
* string the user gave us which hopefully refers to a file on the
* binary path.
*/
Tcl_DString ds;
const char *fileName = Tcl_GetString(pathPtr);
nativeName = tclWinProcs->utf2tchar(fileName, -1, &ds);
handle = tclWinProcs->loadLibraryProc(nativeName);
Tcl_DStringFree(&ds);
}
*loadHandle = (Tcl_LoadHandle) handle;
if (handle == NULL) {
DWORD lastError = GetLastError();
#if 0
/*
* It would be ideal if the FormatMessage stuff worked better, but
* unfortunately it doesn't seem to want to...
*/
LPTSTR lpMsgBuf;
char *buf;
int size;
size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_ALLOCATE_BUFFER, NULL, lastError, 0,
(LPTSTR) &lpMsgBuf, 0, NULL);
buf = (char *) ckalloc((unsigned) TCL_INTEGER_SPACE + size + 1);
sprintf(buf, "%d %s", lastError, (char *)lpMsgBuf);
#endif
Tcl_AppendResult(interp, "couldn't load library \"",
Tcl_GetString(pathPtr), "\": ", NULL);
/*
* Check for possible DLL errors. This doesn't work quite right,
* because Windows seems to only return ERROR_MOD_NOT_FOUND for just
* about any problem, but it's better than nothing. It'd be even
* better if there was a way to get what DLLs
*/
switch (lastError) {
case ERROR_MOD_NOT_FOUND:
case ERROR_DLL_NOT_FOUND:
Tcl_AppendResult(interp, "this library or a dependent library"
" could not be found in library path", NULL);
break;
case ERROR_PROC_NOT_FOUND:
Tcl_AppendResult(interp, "A function specified in the import"
" table could not be resolved by the system. Windows"
" is not telling which one, I'm sorry.", NULL);
break;
case ERROR_INVALID_DLL:
Tcl_AppendResult(interp, "this library or a dependent library"
" is damaged", NULL);
break;
case ERROR_DLL_INIT_FAILED:
Tcl_AppendResult(interp, "the library initialization"
" routine failed", NULL);
break;
default:
TclWinConvertError(lastError);
Tcl_AppendResult(interp, Tcl_PosixError(interp), NULL);
}
return TCL_ERROR;
} else {
*unloadProcPtr = TclpUnloadFile;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclpFindSymbol --
*
* Looks up a symbol, by name, through a handle associated with a
* previously loaded piece of code (shared library).
*
* Results:
* Returns a pointer to the function associated with 'symbol' if it is
* found. Otherwise returns NULL and may leave an error message in the
* interp's result.
*
*----------------------------------------------------------------------
*/
Tcl_PackageInitProc *
TclpFindSymbol(
Tcl_Interp *interp,
Tcl_LoadHandle loadHandle,
const char *symbol)
{
Tcl_PackageInitProc *proc = NULL;
HINSTANCE handle = (HINSTANCE)loadHandle;
/*
* For each symbol, check for both Symbol and _Symbol, since Borland
* generates C symbols with a leading '_' by default.
*/
proc = (Tcl_PackageInitProc *) GetProcAddress(handle, symbol);
if (proc == NULL) {
Tcl_DString ds;
Tcl_DStringInit(&ds);
Tcl_DStringAppend(&ds, "_", 1);
symbol = Tcl_DStringAppend(&ds, symbol, -1);
proc = (Tcl_PackageInitProc *) GetProcAddress(handle, symbol);
Tcl_DStringFree(&ds);
}
return proc;
}
/*
*----------------------------------------------------------------------
*
* TclpUnloadFile --
*
* Unloads a dynamically loaded binary code file from memory. Code
* pointers in the formerly loaded file are no longer valid after calling
* this function.
*
* Results:
* None.
*
* Side effects:
* Code removed from memory.
*
*----------------------------------------------------------------------
*/
void
TclpUnloadFile(
Tcl_LoadHandle loadHandle) /* loadHandle returned by a previous call to
* TclpDlopen(). The loadHandle is a token
* that represents the loaded file. */
{
HINSTANCE handle;
handle = (HINSTANCE) loadHandle;
FreeLibrary(handle);
}
/*
*----------------------------------------------------------------------
*
* TclGuessPackageName --
*
* If the "load" command is invoked without providing a package name,
* this function is invoked to try to figure it out.
*
* Results:
* Always returns 0 to indicate that we couldn't figure out a package
* name; generic code will then try to guess the package from the file
* name. A return value of 1 would have meant that we figured out the
* package name and put it in bufPtr.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclGuessPackageName(
const char *fileName, /* Name of file containing package (already
* translated to local form if needed). */
Tcl_DString *bufPtr) /* Initialized empty dstring. Append package
* name to this if possible. */
{
return 0;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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