/* $Header$ */ /* * tclWinLoad.c -- * * This procedure 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 1.1.1.1 2001/06/13 04:49:20 dtashley Exp $ */ #include "tclWinInt.h" /* *---------------------------------------------------------------------- * * TclpLoadFile -- * * Dynamically loads a binary code file into memory and returns * the addresses of two procedures within that file, if they * are defined. * * 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 TclpLoadFile(interp, fileName, sym1, sym2, proc1Ptr, proc2Ptr, clientDataPtr) Tcl_Interp *interp; /* Used for error reporting. */ char *fileName; /* Name of the file containing the desired * code. */ char *sym1, *sym2; /* Names of two procedures to look up in * the file's symbol table. */ Tcl_PackageInitProc **proc1Ptr, **proc2Ptr; /* Where to return the addresses corresponding * to sym1 and sym2. */ ClientData *clientDataPtr; /* Filled with token for dynamically loaded * file which will be passed back to * TclpUnloadFile() to unload the file. */ { HINSTANCE handle; TCHAR *nativeName; Tcl_DString ds; nativeName = Tcl_WinUtfToTChar(fileName, -1, &ds); handle = (*tclWinProcs->loadLibraryProc)(nativeName); Tcl_DStringFree(&ds); *clientDataPtr = (ClientData) 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 \"", fileName, "\": ", (char *) 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", (char *) NULL); break; case ERROR_INVALID_DLL: Tcl_AppendResult(interp, "this library or a dependent library", " is damaged", (char *) NULL); break; case ERROR_DLL_INIT_FAILED: Tcl_AppendResult(interp, "the library initialization", " routine failed", (char *) NULL); break; default: TclWinConvertError(lastError); Tcl_AppendResult(interp, Tcl_PosixError(interp), (char *) NULL); } return TCL_ERROR; } /* * For each symbol, check for both Symbol and _Symbol, since Borland * generates C symbols with a leading '_' by default. */ *proc1Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym1); if (*proc1Ptr == NULL) { Tcl_DStringAppend(&ds, "_", 1); sym1 = Tcl_DStringAppend(&ds, sym1, -1); *proc1Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym1); Tcl_DStringFree(&ds); } *proc2Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym2); if (*proc2Ptr == NULL) { Tcl_DStringAppend(&ds, "_", 1); sym2 = Tcl_DStringAppend(&ds, sym2, -1); *proc2Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym2); Tcl_DStringFree(&ds); } return TCL_OK; } /* *---------------------------------------------------------------------- * * 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(clientData) ClientData clientData; /* ClientData returned by a previous call * to TclpLoadFile(). The clientData is * a token that represents the loaded * file. */ { HINSTANCE handle; handle = (HINSTANCE) clientData; FreeLibrary(handle); } /* *---------------------------------------------------------------------- * * TclGuessPackageName -- * * If the "load" command is invoked without providing a package * name, this procedure 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(fileName, bufPtr) 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; } /* End of tclwinload.c */