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/*****
** ** Module Header ******************************************************* **
** **
** Modules Revision 3.0 **
** Providing a flexible user environment **
** **
** File: ModuleCmd_Load.c **
** First Edition: 1991/10/23 **
** **
** Authors: John Furlan, jlf@behere.com **
** Jens Hamisch, jens@Strawberry.COM **
** **
** Description: The load and unload procedure that takes care of **
** adding and removing modulefiles to and from the **
** user's environment. **
** **
** Exports: ModuleCmd_Load **
** **
** Notes: **
** **
** ************************************************************************ **
****/
/** ** Copyright *********************************************************** **
** **
** Copyright 1991-1994 by John L. Furlan. **
** see LICENSE.GPL, which must be provided, for details **
** **
** ************************************************************************ **/
static char Id[] = "@(#)$Id: ModuleCmd_Load.c,v 1.8.4.3 2011/10/03 19:31:52 rkowen Exp $";
static void *UseId[] = { &UseId, Id };
/** ************************************************************************ **/
/** HEADERS **/
/** ************************************************************************ **/
#include "modules_def.h"
/** ************************************************************************ **/
/** LOCAL DATATYPES **/
/** ************************************************************************ **/
/** not applicable **/
/** ************************************************************************ **/
/** CONSTANTS **/
/** ************************************************************************ **/
/** not applicable **/
/** ************************************************************************ **/
/** MACROS **/
/** ************************************************************************ **/
/** not applicable **/
/** ************************************************************************ **/
/** LOCAL DATA **/
/** ************************************************************************ **/
static char module_name[] = "ModuleCmd_Load.c"; /** File name of this module **/
#if WITH_DEBUGGING_MODULECMD
static char _proc_ModuleCmd_Load[] = "ModuleCmd_Load";
#endif
/** ************************************************************************ **/
/** PROTOTYPES **/
/** ************************************************************************ **/
/** not applicable **/
/*++++
** ** Function-Header ***************************************************** **
** **
** Function: ModuleCmd_Load **
** **
** Description: Execution of the module-commands 'load' and 'unload' **
** **
** First Edition: 1991/10/23 **
** **
** Parameters: Tcl_Interp *interp Attached Tcl Interp. **
** int load Controls 'load' or **
** 'unload' to be done **
** int argc Number of arguments **
** char *argv[] Argument list **
** **
** Result: int 0 None of the passed modules **
** has been load **
** 1 At least one module has been **
** read **
** **
** Attached Globals: g_specified_module The module name from the **
** command line **
** g_flags These are set up accordingly before **
** this function is called in order to **
** control everything **
** g_current_module The module which is handled **
** by the current command **
** **
** ************************************************************************ **
++++*/
int ModuleCmd_Load( Tcl_Interp *interp,
int load,
int argc,
char *argv[])
{
int i,
return_val, /** Subroutine return values **/
a_successful_load = 0; /** Command return **/
char filename[ MOD_BUFSIZE], /** Module filename **/
modulename[ MOD_BUFSIZE]; /** Real module name **/
Tcl_Interp *tmp_interp; /** Tcl interpreter to be **/
/** used internally **/
Tcl_HashTable **oldTables = NULL;
EM_RetVal em_return_val = EM_OK;
#if WITH_DEBUGGING_MODULECMD
ErrorLogger( NO_ERR_START, LOC, _proc_ModuleCmd_Load, NULL);
#endif
/**
** Set up the flags controling the Tcl callback functions
**/
if( load) {
g_flags |= M_LOAD;
g_flags &= ~M_REMOVE;
} else {
g_flags |= M_REMOVE;
g_flags &= ~M_LOAD;
}
/**
** Handle all module files in the order they are passed to me
**/
for( i=0; i<argc && argv[i]; i++) {
/**
** Set the name of the module specified on the command line
**/
g_specified_module = argv[i];
/**
** Create a Tcl interpreter and initialize it with the module commands
**/
tmp_interp = EM_CreateInterp();
if( TCL_OK != (return_val = InitializeModuleCommands( tmp_interp)))
return( return_val); /** -------- EXIT (FAILURE) -------> **/
filename[0] = '\0';
/**
** UNLOAD to be done
** At first check if it is loaded ...
**/
if( !load) {
char *tmpname;
if( !IsLoaded( tmp_interp, argv[i], &tmpname, filename)) {
#if 0
/** do we really care if it's not loaded ... **/
if( OK != ErrorLogger( ERR_NOTLOADED, LOC, argv[i], NULL))
#endif
return_val = TCL_ERROR;
} else {
/**
** So it is loaded ...
** Do we know the filename?
**/
if ((char *) NULL == stringer(modulename, MOD_BUFSIZE,
tmpname, NULL))
if( OK != ErrorLogger( ERR_STRING, LOC, NULL))
goto unwind0;
if( !filename[0])
if( TCL_ERROR == (return_val = Locate_ModuleFile(
tmp_interp, argv[i], tmpname, filename)))
ErrorLogger( ERR_LOCATE, LOC, argv[i], NULL);
/**
** If IsLoaded() created tmpname, then we must free it.
**/
if( tmpname && (tmpname != argv[i]))
null_free((void *) &tmpname);
} /** if loaded **/
/**
** LOAD to be done
** Only check the filename
**/
} else {
if( TCL_ERROR == (return_val = Locate_ModuleFile( tmp_interp,
argv[i], modulename, filename)))
ErrorLogger( ERR_LOCATE, LOC, argv[i], NULL);
}
/**
** If return_val has been set to something other than TCL_OK,
** then read_status should not be set -- by the ANSI definition.
**
** The functions Read_Modulefile and Update_LoadedList will take
** respect to the 'flags' which are set to M_LOAD or M_REMOVE
** according to the intention of calling this procedure.
**/
g_current_module = modulename;
if( TCL_OK == return_val) {
return_val = Read_Modulefile(tmp_interp, filename);
em_return_val = ReturnValue(tmp_interp, return_val);
switch (em_return_val) {
case EM_OK:
/**
** If module terminates TCL_OK, add it to the loaded list ...
**/
case EM_CONTINUE:
/**
** If module terminates TCL_CONTINUE, add it to the
** loaded list ... but further processing of that module
** has ceased
**/
Tcl_ResetResult(tmp_interp);
Update_LoadedList( tmp_interp, modulename, filename);
/**
** Save the current environment setup before the next module
** file is (un)loaded in case something is broken ...
** ... for Unwind_Modulefile_Changes later on
**/
Tcl_ResetResult(tmp_interp);
if( oldTables) {
Delete_Hash_Tables( oldTables);
null_free((void *) &oldTables);
}
oldTables = Copy_Hash_Tables();
a_successful_load = 1;
break; /* switch */
case EM_BREAK:
/**
** If module terminates TCL_BREAK, don't add it to the list,
** but assume that everything was OK with the module anyway.
** (The original code wasn't correct)
**/
case EM_EXIT:
/**
** If module terminates TCL_EXIT, find the return value
** and exit modulecmd with that ... also none of the
** following modules should be loaded.
**/
case EM_ERROR:
default:
/**
** Reset what has been changed.
**/
Unwind_Modulefile_Changes( tmp_interp, oldTables);
oldTables = NULL;
return_val = TCL_ERROR;
break; /* switch */
}
}
EM_DeleteInterp(tmp_interp);
/* do not process any further modulefiles if EM_EXIT */
if (em_return_val == EM_EXIT) break; /* for */
} /** for **/
/**
** There may only be a spare save environment left, if the final module
** has been load successfully. Remove it in this case
**/
if( em_return_val == EM_OK && oldTables) {
Delete_Hash_Tables( oldTables);
null_free((void *) &oldTables);
}
/**
** Clean up the flags and return
**/
if( load)
g_flags &= ~M_LOAD;
else
g_flags &= ~M_REMOVE;
#if WITH_DEBUGGING_MODULECMD
ErrorLogger( NO_ERR_END, LOC, _proc_ModuleCmd_Load, NULL);
#endif
return( a_successful_load);
unwind0:
return( TCL_ERROR); /** -------- EXIT (FAILURE) -------> **/
} /** End of 'ModuleCmd_Load' **/
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