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/*
* tclLoadNext.c --
*
* This procedure provides a version of the TclLoadFile that
* works with NeXTs rld_* dynamic loading. This file provided
* by Pedja Bogdanovich.
*
* 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: tclLoadNext.c,v 1.5 2001/09/04 18:06:34 vincentdarley Exp $
*/
#include "tclInt.h"
#include <mach-o/rld.h>
#include <streams/streams.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. *proc1Ptr and *proc2Ptr
* are filled in with the addresses of the symbols given by
* *sym1 and *sym2, or NULL if those symbols can't be found.
*
* Side effects:
* New code suddenly appears in memory.
*
*----------------------------------------------------------------------
*/
int
TclpLoadFile(interp, pathPtr, sym1, sym2, proc1Ptr, proc2Ptr,
clientDataPtr, unloadProcPtr)
Tcl_Interp *interp; /* Used for error reporting. */
Tcl_Obj *pathPtr; /* 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
* (*unloadProcPtr)() to unload the file. */
Tcl_FSUnloadFileProc **unloadProcPtr;
/* Filled with address of Tcl_FSUnloadFileProc
* function which should be used for
* this file. */
{
struct mach_header *header;
char *data;
int len, maxlen;
char *files[]={fileName,NULL};
NXStream *errorStream=NXOpenMemory(0,0,NX_READWRITE);
char *fileName = Tcl_GetString(pathPtr);
if(!rld_load(errorStream,&header,files,NULL)) {
NXGetMemoryBuffer(errorStream,&data,&len,&maxlen);
Tcl_AppendResult(interp,"couldn't load file \"",fileName,"\": ",data,NULL);
NXCloseMemory(errorStream,NX_FREEBUFFER);
return TCL_ERROR;
}
NXCloseMemory(errorStream,NX_FREEBUFFER);
*proc1Ptr=NULL;
if(sym1) {
char sym[strlen(sym1)+2];
sym[0]='_'; sym[1]=0; strcat(sym,sym1);
rld_lookup(NULL,sym,(unsigned long *)proc1Ptr);
}
*proc2Ptr=NULL;
if(sym2) {
char sym[strlen(sym2)+2];
sym[0]='_'; sym[1]=0; strcat(sym,sym2);
rld_lookup(NULL,sym,(unsigned long *)proc2Ptr);
}
*clientDataPtr = NULL;
*unloadProcPtr = &TclpUnloadFile;
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:
* Does nothing. Can anything be done?
*
*----------------------------------------------------------------------
*/
void
TclpUnloadFile(clientData)
ClientData clientData; /* ClientData returned by a previous call
* to TclpLoadFile(). The clientData is
* a token that represents the loaded
* file. */
{
}
/*
*----------------------------------------------------------------------
*
* 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;
}
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