/[dtapublic]/projs/trunk/shared_source/c_tcl_base_7_5_w_mods/tclwinload.c
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Revision 25 - (hide annotations) (download)
Sat Oct 8 06:43:03 2016 UTC (7 years, 7 months ago) by dashley
Original Path: sf_code/esrgpcpj/shared/tcl_base/tclwinload.c
File MIME type: text/plain
File size: 6216 byte(s)
Initial commit.
1 dashley 25 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tcl_base/tclwinload.c,v 1.1.1.1 2001/06/13 04:49:20 dtashley Exp $ */
2    
3     /*
4     * tclWinLoad.c --
5     *
6     * This procedure provides a version of the TclLoadFile that
7     * works with the Windows "LoadLibrary" and "GetProcAddress"
8     * API for dynamic loading.
9     *
10     * Copyright (c) 1995-1997 Sun Microsystems, Inc.
11     *
12     * See the file "license.terms" for information on usage and redistribution
13     * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
14     *
15     * RCS: @(#) $Id: tclwinload.c,v 1.1.1.1 2001/06/13 04:49:20 dtashley Exp $
16     */
17    
18     #include "tclWinInt.h"
19    
20    
21     /*
22     *----------------------------------------------------------------------
23     *
24     * TclpLoadFile --
25     *
26     * Dynamically loads a binary code file into memory and returns
27     * the addresses of two procedures within that file, if they
28     * are defined.
29     *
30     * Results:
31     * A standard Tcl completion code. If an error occurs, an error
32     * message is left in the interp's result.
33     *
34     * Side effects:
35     * New code suddenly appears in memory.
36     *
37     *----------------------------------------------------------------------
38     */
39    
40     int
41     TclpLoadFile(interp, fileName, sym1, sym2, proc1Ptr, proc2Ptr, clientDataPtr)
42     Tcl_Interp *interp; /* Used for error reporting. */
43     char *fileName; /* Name of the file containing the desired
44     * code. */
45     char *sym1, *sym2; /* Names of two procedures to look up in
46     * the file's symbol table. */
47     Tcl_PackageInitProc **proc1Ptr, **proc2Ptr;
48     /* Where to return the addresses corresponding
49     * to sym1 and sym2. */
50     ClientData *clientDataPtr; /* Filled with token for dynamically loaded
51     * file which will be passed back to
52     * TclpUnloadFile() to unload the file. */
53     {
54     HINSTANCE handle;
55     TCHAR *nativeName;
56     Tcl_DString ds;
57    
58     nativeName = Tcl_WinUtfToTChar(fileName, -1, &ds);
59     handle = (*tclWinProcs->loadLibraryProc)(nativeName);
60     Tcl_DStringFree(&ds);
61    
62     *clientDataPtr = (ClientData) handle;
63    
64     if (handle == NULL) {
65     DWORD lastError = GetLastError();
66     #if 0
67     /*
68     * It would be ideal if the FormatMessage stuff worked better,
69     * but unfortunately it doesn't seem to want to...
70     */
71     LPTSTR lpMsgBuf;
72     char *buf;
73     int size;
74     size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
75     FORMAT_MESSAGE_ALLOCATE_BUFFER, NULL, lastError, 0,
76     (LPTSTR) &lpMsgBuf, 0, NULL);
77     buf = (char *) ckalloc((unsigned) TCL_INTEGER_SPACE + size + 1);
78     sprintf(buf, "%d %s", lastError, (char *)lpMsgBuf);
79     #endif
80     Tcl_AppendResult(interp, "couldn't load library \"",
81     fileName, "\": ", (char *) NULL);
82     /*
83     * Check for possible DLL errors. This doesn't work quite right,
84     * because Windows seems to only return ERROR_MOD_NOT_FOUND for
85     * just about any problem, but it's better than nothing. It'd be
86     * even better if there was a way to get what DLLs
87     */
88     switch (lastError) {
89     case ERROR_MOD_NOT_FOUND:
90     case ERROR_DLL_NOT_FOUND:
91     Tcl_AppendResult(interp, "this library or a dependent library",
92     " could not be found in library path", (char *)
93     NULL);
94     break;
95     case ERROR_INVALID_DLL:
96     Tcl_AppendResult(interp, "this library or a dependent library",
97     " is damaged", (char *) NULL);
98     break;
99     case ERROR_DLL_INIT_FAILED:
100     Tcl_AppendResult(interp, "the library initialization",
101     " routine failed", (char *) NULL);
102     break;
103     default:
104     TclWinConvertError(lastError);
105     Tcl_AppendResult(interp, Tcl_PosixError(interp),
106     (char *) NULL);
107     }
108     return TCL_ERROR;
109     }
110    
111     /*
112     * For each symbol, check for both Symbol and _Symbol, since Borland
113     * generates C symbols with a leading '_' by default.
114     */
115    
116     *proc1Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym1);
117     if (*proc1Ptr == NULL) {
118     Tcl_DStringAppend(&ds, "_", 1);
119     sym1 = Tcl_DStringAppend(&ds, sym1, -1);
120     *proc1Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym1);
121     Tcl_DStringFree(&ds);
122     }
123    
124     *proc2Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym2);
125     if (*proc2Ptr == NULL) {
126     Tcl_DStringAppend(&ds, "_", 1);
127     sym2 = Tcl_DStringAppend(&ds, sym2, -1);
128     *proc2Ptr = (Tcl_PackageInitProc *) GetProcAddress(handle, sym2);
129     Tcl_DStringFree(&ds);
130     }
131     return TCL_OK;
132     }
133    
134     /*
135     *----------------------------------------------------------------------
136     *
137     * TclpUnloadFile --
138     *
139     * Unloads a dynamically loaded binary code file from memory.
140     * Code pointers in the formerly loaded file are no longer valid
141     * after calling this function.
142     *
143     * Results:
144     * None.
145     *
146     * Side effects:
147     * Code removed from memory.
148     *
149     *----------------------------------------------------------------------
150     */
151    
152     void
153     TclpUnloadFile(clientData)
154     ClientData clientData; /* ClientData returned by a previous call
155     * to TclpLoadFile(). The clientData is
156     * a token that represents the loaded
157     * file. */
158     {
159     HINSTANCE handle;
160    
161     handle = (HINSTANCE) clientData;
162     FreeLibrary(handle);
163     }
164    
165     /*
166     *----------------------------------------------------------------------
167     *
168     * TclGuessPackageName --
169     *
170     * If the "load" command is invoked without providing a package
171     * name, this procedure is invoked to try to figure it out.
172     *
173     * Results:
174     * Always returns 0 to indicate that we couldn't figure out a
175     * package name; generic code will then try to guess the package
176     * from the file name. A return value of 1 would have meant that
177     * we figured out the package name and put it in bufPtr.
178     *
179     * Side effects:
180     * None.
181     *
182     *----------------------------------------------------------------------
183     */
184    
185     int
186     TclGuessPackageName(fileName, bufPtr)
187     char *fileName; /* Name of file containing package (already
188     * translated to local form if needed). */
189     Tcl_DString *bufPtr; /* Initialized empty dstring. Append
190     * package name to this if possible. */
191     {
192     return 0;
193     }
194    
195    
196     /* $History: tclwinload.c $
197     *
198     * ***************** Version 1 *****************
199     * User: Dtashley Date: 1/02/01 Time: 12:40a
200     * Created in $/IjuScripter, IjuConsole/Source/Tcl Base
201     * Initial check-in.
202     */
203    
204     /* End of TCLWINLOAD.C */

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