cpython/Python/dynload_mac.c

/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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******************************************************************/

/* Support for dynamic loading of extension modules */

#include "Python.h"
#include "importdl.h"

#include <Aliases.h>
#include <CodeFragments.h>
#ifdef SYMANTEC__CFM68K__ /* Really an older version of Universal Headers */
#define CFragConnectionID ConnectionID
#define kLoadCFrag 0x01
#endif
#ifdef USE_GUSI1
#include "TFileSpec.h"		/* for Path2FSSpec() */
#endif
#include <Files.h>
#include "macdefs.h"
#include "macglue.h"


const struct filedescr _PyImport_DynLoadFiletab[] = {
	{".slb", "rb", C_EXTENSION},
#ifdef __CFM68K__
	{".CFM68K.slb", "rb", C_EXTENSION},
#else
	{".ppc.slb", "rb", C_EXTENSION},
#endif
	{0, 0}
};


dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
				    const char *pathname, FILE *fp)
{
	dl_funcptr p;
	char funcname[258];

	/*
	** Dynamic loading of CFM shared libraries on the Mac.  The
	** code has become more convoluted than it was, because we
	** want to be able to put multiple modules in a single
	** file. For this reason, we have to determine the fragment
	** name, and we cannot use the library entry point but we have
	** to locate the correct init routine "by hand".
	*/
	FSSpec libspec;
	CFragConnectionID connID;
	Ptr mainAddr;
	Str255 errMessage;
	OSErr err;
#ifndef USE_GUSI1
	Boolean isfolder, didsomething;
#endif
	char buf[512];
	Str63 fragname;
	Ptr symAddr;
	CFragSymbolClass class;
		
	/* First resolve any aliases to find the real file */
#ifdef USE_GUSI1
	err = Path2FSSpec(pathname, &libspec);
#else
	(void)FSMakeFSSpec(0, 0, Pstring(pathname), &libspec);
	err = ResolveAliasFile(&libspec, 1, &isfolder, &didsomething);
#endif
	if ( err ) {
		sprintf(buf, "%.255s: %.200s",
			pathname, PyMac_StrError(err));
		PyErr_SetString(PyExc_ImportError, buf);
		return NULL;
	}
	/* Next, determine the fragment name,
	   by stripping '.slb' and 'module' */
	memcpy(fragname+1, libspec.name+1, libspec.name[0]);
	fragname[0] = libspec.name[0];
	if( strncmp((char *)(fragname+1+fragname[0]-4),
		    ".slb", 4) == 0 )
		fragname[0] -= 4;
	if ( strncmp((char *)(fragname+1+fragname[0]-6),
		     "module", 6) == 0 )
		fragname[0] -= 6;
	/* Load the fragment
	   (or return the connID if it is already loaded */
	err = GetDiskFragment(&libspec, 0, 0, fragname, 
			      kLoadCFrag, &connID, &mainAddr,
			      errMessage);
	if ( err == cfragImportTooOldErr || err == cfragImportTooNewErr ) {
		/*
		** Special-case code: if PythonCore is too old or too new this means
		** the dynamic module was meant for a different Python.
		*/
		if (errMessage[0] == 10 && strncmp((char *)errMessage+1, "PythonCore", 10) == 0 ) {
			sprintf(buf, "Dynamic module was built for %s version of MacPython",
				(err == cfragImportTooOldErr ? "a newer" : "an older"));
			PyErr_SetString(PyExc_ImportError, buf);
			return NULL;
		}
	}
	if ( err ) {
		sprintf(buf, "%.*s: %.200s",
			errMessage[0], errMessage+1,
			PyMac_StrError(err));
		PyErr_SetString(PyExc_ImportError, buf);
		return NULL;
	}
	/* Locate the address of the correct init function */
	sprintf(funcname, "init%.200s", shortname);
	err = FindSymbol(connID, Pstring(funcname), &symAddr, &class);
	if ( err ) {
		sprintf(buf, "%s: %.200s",
			funcname, PyMac_StrError(err));
		PyErr_SetString(PyExc_ImportError, buf);
		return NULL;
	}
	p = (dl_funcptr)symAddr;

	return p;
}