summaryrefslogtreecommitdiffstats
path: root/win/tclWinLoad.c
blob: 48a6c3bb9455b54615c69732472c6d9f96dae3d2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/* 
 * 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 1.12 2002/07/17 20:00:46 vincentdarley 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
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). */
    TclLoadHandle *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;
    Tcl_DString ds;

    char *fileName = Tcl_GetString(pathPtr);
    nativeName = Tcl_WinUtfToTChar(fileName, -1, &ds);
    handle = (*tclWinProcs->loadLibraryProc)(nativeName);
    Tcl_DStringFree(&ds);

    *loadHandle = (TclLoadHandle) 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_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;
}

Tcl_PackageInitProc*
TclpFindSymbol(interp, loadHandle, symbol) 
    Tcl_Interp *interp;
    TclLoadHandle 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(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)
    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;
}