Import Tcl 8.5.15 (as of svn r89086)
This commit is contained in:
Zachary Ware
247
win/tclWinLoad.c
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247
win/tclWinLoad.c
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/*
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* tclWinLoad.c --
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*
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* This function provides a version of the TclLoadFile that works with
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* the Windows "LoadLibrary" and "GetProcAddress" API for dynamic
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* loading.
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*
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* Copyright (c) 1995-1997 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution of
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*/
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#include "tclWinInt.h"
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/*
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*----------------------------------------------------------------------
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*
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* TclpDlopen --
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*
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* Dynamically loads a binary code file into memory and returns a handle
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* to the new code.
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*
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* Results:
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* A standard Tcl completion code. If an error occurs, an error message
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* is left in the interp's result.
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*
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* Side effects:
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* New code suddenly appears in memory.
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*
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*----------------------------------------------------------------------
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*/
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int
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TclpDlopen(
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Tcl_Interp *interp, /* Used for error reporting. */
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Tcl_Obj *pathPtr, /* Name of the file containing the desired
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* code (UTF-8). */
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Tcl_LoadHandle *loadHandle, /* Filled with token for dynamically loaded
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* file which will be passed back to
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* (*unloadProcPtr)() to unload the file. */
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Tcl_FSUnloadFileProc **unloadProcPtr)
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/* Filled with address of Tcl_FSUnloadFileProc
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* function which should be used for this
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* file. */
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{
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HINSTANCE handle;
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CONST TCHAR *nativeName;
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/*
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* First try the full path the user gave us. This is particularly
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* important if the cwd is inside a vfs, and we are trying to load using a
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* relative path.
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*/
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nativeName = Tcl_FSGetNativePath(pathPtr);
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handle = (*tclWinProcs->loadLibraryExProc)(nativeName, NULL,
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LOAD_WITH_ALTERED_SEARCH_PATH);
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if (handle == NULL) {
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/*
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* Let the OS loader examine the binary search path for whatever
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* string the user gave us which hopefully refers to a file on the
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* binary path.
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*/
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Tcl_DString ds;
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char *fileName = Tcl_GetString(pathPtr);
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nativeName = Tcl_WinUtfToTChar(fileName, -1, &ds);
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handle = (*tclWinProcs->loadLibraryExProc)(nativeName, NULL,
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LOAD_WITH_ALTERED_SEARCH_PATH);
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Tcl_DStringFree(&ds);
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}
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*loadHandle = (Tcl_LoadHandle) handle;
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if (handle == NULL) {
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DWORD lastError = GetLastError();
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#if 0
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/*
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* It would be ideal if the FormatMessage stuff worked better, but
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* unfortunately it doesn't seem to want to...
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*/
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LPTSTR lpMsgBuf;
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char *buf;
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int size;
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size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_ALLOCATE_BUFFER, NULL, lastError, 0,
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(LPTSTR) &lpMsgBuf, 0, NULL);
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buf = (char *) ckalloc((unsigned) TCL_INTEGER_SPACE + size + 1);
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sprintf(buf, "%d %s", lastError, (char *)lpMsgBuf);
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#endif
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Tcl_AppendResult(interp, "couldn't load library \"",
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Tcl_GetString(pathPtr), "\": ", NULL);
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/*
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* Check for possible DLL errors. This doesn't work quite right,
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* because Windows seems to only return ERROR_MOD_NOT_FOUND for just
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* about any problem, but it's better than nothing. It'd be even
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* better if there was a way to get what DLLs
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*/
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switch (lastError) {
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case ERROR_MOD_NOT_FOUND:
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case ERROR_DLL_NOT_FOUND:
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Tcl_AppendResult(interp, "this library or a dependent library"
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" could not be found in library path", NULL);
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break;
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case ERROR_PROC_NOT_FOUND:
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Tcl_AppendResult(interp, "A function specified in the import"
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" table could not be resolved by the system. Windows"
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" is not telling which one, I'm sorry.", NULL);
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break;
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case ERROR_INVALID_DLL:
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Tcl_AppendResult(interp, "this library or a dependent library"
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" is damaged", NULL);
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break;
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case ERROR_DLL_INIT_FAILED:
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Tcl_AppendResult(interp, "the library initialization"
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" routine failed", NULL);
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break;
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default:
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TclWinConvertError(lastError);
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Tcl_AppendResult(interp, Tcl_PosixError(interp), NULL);
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}
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return TCL_ERROR;
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} else {
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*unloadProcPtr = &TclpUnloadFile;
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}
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return TCL_OK;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TclpFindSymbol --
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*
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* Looks up a symbol, by name, through a handle associated with a
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* previously loaded piece of code (shared library).
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*
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* Results:
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* Returns a pointer to the function associated with 'symbol' if it is
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* found. Otherwise returns NULL and may leave an error message in the
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* interp's result.
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*
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*----------------------------------------------------------------------
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*/
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Tcl_PackageInitProc *
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TclpFindSymbol(
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Tcl_Interp *interp,
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Tcl_LoadHandle loadHandle,
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CONST char *symbol)
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{
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Tcl_PackageInitProc *proc = NULL;
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HINSTANCE handle = (HINSTANCE)loadHandle;
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/*
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* For each symbol, check for both Symbol and _Symbol, since Borland
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* generates C symbols with a leading '_' by default.
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*/
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proc = (Tcl_PackageInitProc *) GetProcAddress(handle, symbol);
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if (proc == NULL) {
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Tcl_DString ds;
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Tcl_DStringInit(&ds);
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Tcl_DStringAppend(&ds, "_", 1);
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symbol = Tcl_DStringAppend(&ds, symbol, -1);
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proc = (Tcl_PackageInitProc *) GetProcAddress(handle, symbol);
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Tcl_DStringFree(&ds);
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}
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return proc;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TclpUnloadFile --
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*
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* Unloads a dynamically loaded binary code file from memory. Code
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* pointers in the formerly loaded file are no longer valid after calling
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* this function.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Code removed from memory.
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*
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*----------------------------------------------------------------------
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*/
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void
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TclpUnloadFile(
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Tcl_LoadHandle loadHandle) /* loadHandle returned by a previous call to
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* TclpDlopen(). The loadHandle is a token
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* that represents the loaded file. */
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{
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HINSTANCE handle;
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handle = (HINSTANCE) loadHandle;
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FreeLibrary(handle);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TclGuessPackageName --
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*
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* If the "load" command is invoked without providing a package name,
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* this function is invoked to try to figure it out.
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*
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* Results:
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* Always returns 0 to indicate that we couldn't figure out a package
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* name; generic code will then try to guess the package from the file
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* name. A return value of 1 would have meant that we figured out the
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* package name and put it in bufPtr.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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TclGuessPackageName(
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CONST char *fileName, /* Name of file containing package (already
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* translated to local form if needed). */
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Tcl_DString *bufPtr) /* Initialized empty dstring. Append package
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* name to this if possible. */
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{
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return 0;
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}
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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 4
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* fill-column: 78
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* End:
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*/
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