--- /dev/null
+/*
+ * 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: @(#) $Id$
+ */
+
+#include "tclWinInt.h"
+
+\f
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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(interp, pathPtr, loadHandle, unloadProcPtr)
+ 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;
+ char *fileName = Tcl_GetString(pathPtr);
+ nativeName = Tcl_WinUtfToTChar(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), "\": ", (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_PROC_NOT_FOUND:
+ Tcl_AppendResult(interp, "could not find specified procedure",
+ (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;
+ } else {
+ *unloadProcPtr = &TclpUnloadFile;
+ }
+ return TCL_OK;
+}
+\f
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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(interp, loadHandle, symbol)
+ 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;
+}
+\f
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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(loadHandle)
+ 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);
+}
+\f
+/*
+ *----------------------------------------------------------------------
+ *
+ * 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)
+ 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;
+}
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