1/*
2 * tclLoadNext.c --
3 *
4 *	This procedure provides a version of the TclLoadFile that
5 *	works with NeXTs rld_* dynamic loading.  This file provided
6 *	by Pedja Bogdanovich.
7 *
8 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
9 *
10 * See the file "license.terms" for information on usage and redistribution
11 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
12 *
13 * RCS: @(#) $Id: tclLoadNext.c,v 1.11 2002/10/10 12:25:53 vincentdarley Exp $
14 */
15
16#include "tclInt.h"
17#include <mach-o/rld.h>
18#include <streams/streams.h>
19
20/*
21 *----------------------------------------------------------------------
22 *
23 * TclpDlopen --
24 *
25 *	Dynamically loads a binary code file into memory and returns
26 *	a handle to the new code.
27 *
28 * Results:
29 *	A standard Tcl completion code.  If an error occurs, an error
30 *	message is left in the interp's result.
31 *
32 * Side effects:
33 *	New code suddenly appears in memory.
34 *
35 *----------------------------------------------------------------------
36 */
37
38int
39TclpDlopen(interp, pathPtr, loadHandle, unloadProcPtr)
40    Tcl_Interp *interp;		/* Used for error reporting. */
41    Tcl_Obj *pathPtr;		/* Name of the file containing the desired
42				 * code (UTF-8). */
43    Tcl_LoadHandle *loadHandle;	/* Filled with token for dynamically loaded
44				 * file which will be passed back to
45				 * (*unloadProcPtr)() to unload the file. */
46    Tcl_FSUnloadFileProc **unloadProcPtr;
47				/* Filled with address of Tcl_FSUnloadFileProc
48				 * function which should be used for
49				 * this file. */
50{
51    struct mach_header *header;
52    char *fileName;
53    char *files[2];
54    CONST char *native;
55    int result = 1;
56
57    NXStream *errorStream = NXOpenMemory(0,0,NX_READWRITE);
58
59    fileName = Tcl_GetString(pathPtr);
60
61    /*
62     * First try the full path the user gave us.  This is particularly
63     * important if the cwd is inside a vfs, and we are trying to load
64     * using a relative path.
65     */
66    native = Tcl_FSGetNativePath(pathPtr);
67    files = {native,NULL};
68
69    result = rld_load(errorStream, &header, files, NULL);
70
71    if (!result) {
72	/*
73	 * Let the OS loader examine the binary search path for
74	 * whatever string the user gave us which hopefully refers
75	 * to a file on the binary path
76	 */
77	Tcl_DString ds;
78	native = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds);
79	files = {native,NULL};
80	result = rld_load(errorStream, &header, files, NULL);
81	Tcl_DStringFree(&ds);
82    }
83
84    if (!result) {
85	char *data;
86	int len, maxlen;
87	NXGetMemoryBuffer(errorStream,&data,&len,&maxlen);
88	Tcl_AppendResult(interp, "couldn't load file \"",
89			 fileName, "\": ", data, NULL);
90	NXCloseMemory(errorStream, NX_FREEBUFFER);
91	return TCL_ERROR;
92    }
93    NXCloseMemory(errorStream, NX_FREEBUFFER);
94
95    *loadHandle = (Tcl_LoadHandle)1; /* A dummy non-NULL value */
96    *unloadProcPtr = &TclpUnloadFile;
97
98    return TCL_OK;
99}
100
101/*
102 *----------------------------------------------------------------------
103 *
104 * TclpFindSymbol --
105 *
106 *	Looks up a symbol, by name, through a handle associated with
107 *	a previously loaded piece of code (shared library).
108 *
109 * Results:
110 *	Returns a pointer to the function associated with 'symbol' if
111 *	it is found.  Otherwise returns NULL and may leave an error
112 *	message in the interp's result.
113 *
114 *----------------------------------------------------------------------
115 */
116Tcl_PackageInitProc*
117TclpFindSymbol(interp, loadHandle, symbol)
118    Tcl_Interp *interp;
119    Tcl_LoadHandle loadHandle;
120    CONST char *symbol;
121{
122    Tcl_PackageInitProc *proc=NULL;
123    if(symbol) {
124	char sym[strlen(symbol)+2];
125	sym[0]='_'; sym[1]=0; strcat(sym,symbol);
126	rld_lookup(NULL,sym,(unsigned long *)&proc);
127    }
128    return proc;
129}
130
131/*
132 *----------------------------------------------------------------------
133 *
134 * TclpUnloadFile --
135 *
136 *	Unloads a dynamically loaded binary code file from memory.
137 *	Code pointers in the formerly loaded file are no longer valid
138 *	after calling this function.
139 *
140 * Results:
141 *	None.
142 *
143 * Side effects:
144 *	Does nothing.  Can anything be done?
145 *
146 *----------------------------------------------------------------------
147 */
148
149void
150TclpUnloadFile(loadHandle)
151    Tcl_LoadHandle loadHandle;	/* loadHandle returned by a previous call
152				 * to TclpDlopen().  The loadHandle is
153				 * a token that represents the loaded
154				 * file. */
155{
156}
157
158/*
159 *----------------------------------------------------------------------
160 *
161 * TclGuessPackageName --
162 *
163 *	If the "load" command is invoked without providing a package
164 *	name, this procedure is invoked to try to figure it out.
165 *
166 * Results:
167 *	Always returns 0 to indicate that we couldn't figure out a
168 *	package name;  generic code will then try to guess the package
169 *	from the file name.  A return value of 1 would have meant that
170 *	we figured out the package name and put it in bufPtr.
171 *
172 * Side effects:
173 *	None.
174 *
175 *----------------------------------------------------------------------
176 */
177
178int
179TclGuessPackageName(fileName, bufPtr)
180    CONST char *fileName;	/* Name of file containing package (already
181				 * translated to local form if needed). */
182    Tcl_DString *bufPtr;	/* Initialized empty dstring.  Append
183				 * package name to this if possible. */
184{
185    return 0;
186}
187