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ModuleCmd_Update.c
282 lines (235 loc) · 8.46 KB
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ModuleCmd_Update.c
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/*****
** ** Module Header ******************************************************* **
** **
** Modules Revision 3.0 **
** Providing a flexible user environment **
** **
** File: ModuleCmd_Update.c **
** First Edition: 1991/10/23 **
** **
** Authors: John Furlan, jlf@behere.com **
** Jens Hamisch, jens@Strawberry.COM **
** **
** Description: Uses the beginning environment stored the first time **
** each login session to reload all of the currently **
** **
** Notes: **
** **
** ************************************************************************ **
****/
/** ** Copyright *********************************************************** **
** **
** Copyright 1991-1994 by John L. Furlan. **
** see LICENSE.GPL, which must be provided, for details **
** **
** ************************************************************************ **/
static char Id[] = "@(#)$Id$";
static void *UseId[] = { &UseId, Id };
/** ************************************************************************ **/
/** HEADERS **/
/** ************************************************************************ **/
#include "modules_def.h"
/** ************************************************************************ **/
/** LOCAL DATATYPES **/
/** ************************************************************************ **/
/** not applicable **/
/** ************************************************************************ **/
/** CONSTANTS **/
/** ************************************************************************ **/
#define UPD_BUFSIZE 2048
/** ************************************************************************ **/
/** MACROS **/
/** ************************************************************************ **/
/** not applicable **/
/** ************************************************************************ **/
/** LOCAL DATA **/
/** ************************************************************************ **/
static char module_name[] = __FILE__;
/** ************************************************************************ **/
/** PROTOTYPES **/
/** ************************************************************************ **/
/** not applicable **/
/*++++
** ** Function-Header ***************************************************** **
** **
** Function: ModuleCmd_Update **
** **
** Description: Execution of the module-command 'update' **
** **
** First Edition: 1991/10/23 **
** **
** Parameters: Tcl_Interp *interp Attached Tcl Interp. **
** int argc Number of arguments **
** char *argv[] Argument list **
** **
** Result: int TCL_ERROR Failure **
** TCL_OK Successful operation **
** **
** Attached Globals: flags Controls the callback functions **
** **
** ************************************************************************ **
++++*/
int ModuleCmd_Update( Tcl_Interp *interp,
int count,
char *module_list[])
{
#ifdef BEGINENV
char *buf, /** Read buffer **/
*var_ptr, /** Pointer to a variables name **/
*val_ptr, /** Pointer to a variables value **/
**load_list, /** List of loaded modules **/
*tmpload, /** LOADEDMODULES contents **/
*loaded, /** Buffer for tokenization **/
*filename; /** The name of the file, where the **/
/** beginning environment resides **/
FILE *file; /** Handle to read in a file **/
int list_count = 0,
maxlist = 16, /** Max. number of list entries **/
buffer_size = UPD_BUFSIZE;
/** Current size of the input buffer **/
char *ptr, c; /** Read pointers and char buffer **/
# if BEGINENV == 99
if (!EMGetEnv( interp,"MODULESBEGINENV")) {
ErrorLogger( ERR_BEGINENVX, LOC, NULL);
return( TCL_ERROR); /** -------- EXIT (FAILURE) -------> **/
}
# endif
/**
** Nothing loaded so far - we're ready!
**/
if(!(tmpload = (char *) getenv("LOADEDMODULES"))) {
if( OK != ErrorLogger( ERR_MODULE_PATH, LOC, NULL))
goto unwind0;
else
goto success0;
}
/**
** First I'll update the environment with whatever in _MODULESBEGINENV_
**/
filename = EMGetEnv( interp,"_MODULESBEGINENV_");
if(filename && *filename) {
/**
** Read the begining environment
**/
if((file = fopen( filename, "r"))) {
if(!(buf = stringer(NULL, buffer_size, NULL )))
if( OK != ErrorLogger( ERR_STRING, LOC, NULL))
goto unwind0;
while( !feof( file)) {
/**
** Trigger on entries of the type
** <variable> = <value>
**/
ptr = buf;
while( !feof( file)) {
if((ptr-buf) >= buffer_size-10) { /** 10 bytes safety **/
null_free((void *) &buf);
if(!(buf = stringer(NULL,
buffer_size += UPD_BUFSIZE, NULL )))
if( OK != ErrorLogger( ERR_STRING, LOC, NULL))
goto unwind0;
}
/**
** Read a character and put it into the read buffer. Check
** for the lines (CR) or a terminator character ...
**/
if( '\n' == (*ptr++ = c = fgetc( file))) {
*ptr++ = c = '\0';
break;
}
if( !c)
break;
} /** while **/
/**
** If there hasn't been a terminator so far, put it at the
** end of the line. Therefor we've left a safety space at the
** buffers end ;-)
**/
if( c)
*ptr++ = '\0';
/**
** Now let's evaluate the read line
**/
if( (var_ptr = strchr( buf, '=')) ) {
*var_ptr = '\0';
val_ptr = var_ptr+1;
var_ptr = buf;
/**
** Reset the environment to the values derivered from the
** _MODULESBEGINENV_.
** Do not change the LOADEDMODULES variable ;-)
** Do not change the TCL_LIBRARY and TK_LIBRARY also.
**/
if( strncmp( var_ptr, "LOADEDMODULES", 12) &&
strncmp( var_ptr, "TCL_LIBRARY", 10 ) &&
strncmp( var_ptr, "TK_LIBRARY", 9 )) {
if( !strncmp( var_ptr, "MODULEPATH", 10))
moduleSetenv( interp, var_ptr, val_ptr, 1);
else
EMSetEnv( interp, var_ptr, val_ptr);
}
} /** if( var_ptr) **/
} /** while **/
/**
** Close the _MODULESBEGINENV_ file anf free up the read buffer.
**/
null_free((void *) &buf);
if( EOF == fclose( file))
if( OK != ErrorLogger( ERR_CLOSE, LOC, filename, NULL))
goto unwind0;
} else { /** if( fopen) **/
if( OK != ErrorLogger( ERR_OPEN, LOC, filename,_(em_reading),NULL))
goto unwind0;
} /** if( fopen) **/
} /** if( filename) **/
null_free((void *) &filename);
/**
** Allocate memory for a buffer to tokenize the list of loaded modules
** and a list buffer
**/
if(!(load_list = (char**) module_malloc( maxlist*sizeof(char**))))
if( OK != ErrorLogger( ERR_ALLOC, LOC, NULL))
goto unwind0;
if(!(loaded = stringer(NULL, 0, tmpload, NULL)))
if( OK != ErrorLogger( ERR_STRING, LOC, NULL))
goto unwind1;
/**
** Tokenize and build the list
**/
if( *loaded) {
for( load_list[ list_count++] = xstrtok( loaded, ":");
load_list[ list_count-1];
load_list[ list_count++] = xstrtok( NULL, ":") ) {
/**
** Conditionally we have to double the space, we've allocated for
** the list
**/
if( list_count >= maxlist) {
maxlist = maxlist<<1;
if(!(load_list = (char**) module_realloc(
(char *) load_list, maxlist*sizeof(char**))))
if( OK != ErrorLogger( ERR_ALLOC, LOC, NULL))
goto unwind1;
} /** if( maxlist) **/
} /** for **/
/**
** Load all the modules in the list
**/
ModuleCmd_Load( interp, 1, list_count, load_list);
}
/**
** Free up what has been allocated and return on success
**/
null_free((void *) &loaded);
null_free((void *) &load_list);
success0:
return( TCL_OK); /** -------- EXIT (SUCCESS) -------> **/
unwind1:
null_free((void *) &load_list);
unwind0:
null_free((void *) &filename);
#else /* BEGINENV */
ErrorLogger( ERR_BEGINENV, LOC, NULL);
#endif /* !BEGINENV */
return( TCL_ERROR); /** -------- EXIT (FAILURE) -------> **/
} /** End of 'ModuleCmd_Update' **/