modules/cmdMisc.c at master · abrodkin/modules · GitHub

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/*****
 ** ** Module Header ******************************************************* **
 ** 									     **
 **   Modules Revision 3.0						     **
 **   Providing a flexible user environment				     **
 ** 									     **
 **   File:		cmdMisc.c					     **
 **   First Edition:	1991/10/23					     **
 ** 									     **
 **   Authors:	John Furlan, jlf@behere.com				     **
 **		Jens Hamisch, jens@Strawberry.COM			     **
 ** 									     **
 **   Description:	The Tcl 'system' command			     **
 ** 									     **
 **   Exports:		cmdSystem					     **
 ** 									     **
 **   Notes:		The Following code was written by Don Libes, NIST    **
 **			It was taken from his tool, 'expect' ...	     **
 **  			I have edited parts of it...			     **
 ** 									     **
 ** ************************************************************************ **
 ****/

/** ** 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 MAX_ARGLIST 10240

/** ************************************************************************ **/
/**				      MACROS				     **/
/** ************************************************************************ **/

/** not applicable **/

/** ************************************************************************ **/
/** 				    LOCAL DATA				     **/
/** ************************************************************************ **/

static	char	module_name[] = __FILE__;

/** ************************************************************************ **/
/**				    PROTOTYPES				     **/
/** ************************************************************************ **/

/** not applicable **/


/*++++
 ** ** Function-Header ***************************************************** **
 ** 									     **
 **   Function:		cmdSystem					     **
 ** 									     **
 **   Description:	Callback function for 'system'			     **
 ** 									     **
 **   First Edition:	1991/10/23					     **
 ** 									     **
 **   Parameters:	ClientData	 client_data			     **
 **			Tcl_Interp	*interp		According Tcl interp.**
 **			int		 objc		Number of arguments  **
 **			Tcl_Obj		*objv[]		Argument array	     **
 ** 									     **
 **   Result:		int	TCL_OK		Successful completion	     **
 **				TCL_ERROR	Any error		     **
 ** 									     **
 **   Attached Globals:	g_flags		These are set up accordingly before  **
 **					this function is called in order to  **
 **					control everything		     **
 ** 									     **
 ** ************************************************************************ **
 ++++*/

int cmdSystem(
	ClientData clientData,
	Tcl_Interp * interp,
	int objc,
	Tcl_Obj * CONST84 objv[]
) {
	int             saved_stdout,		/** save the stdout fd	     **/
	                total_len = 0,		/** total string length	     **/
			arg_len,		/** each arg string length   **/
			i;			/** loop counter	     **/
	char            buf[MAX_ARGLIST],	/** buffer for string to int **/
	               *bufp = buf;		/** buffer ptr		     **/
    /**
     **  Whatis mode
     **/
	if (g_flags & (M_WHATIS | M_HELP))
		return (TCL_OK);	/** -------- EXIT (SUCCESS) -------> **/
    /**
     **  Display mode?
     **/
	if (g_flags & M_DISPLAY) {
		fprintf(stderr, "%s\t\t ", Tcl_GetString(objv[0]));
		for (i = 1; i < objc; i++)
			fprintf(stderr, "%s ", Tcl_GetString(objv[i]));
		fprintf(stderr, "\n");
		return (TCL_OK);	/** -------- EXIT PROCEDURE -------> **/
	}

    /**
     **  Prepare a buffer to hold the complete 'system' call
     **  Watch over the commands complete length while copying ...
     **/
	for (i = 1; i < objc; i++) {
		total_len += (1 + (arg_len = strlen(Tcl_GetString(objv[i]))));
		if (total_len > MAX_ARGLIST) {
			if (OK != ErrorLogger(ERR_ARGSTOLONG, LOC,
				Tcl_GetString(objv[0]),
				(sprintf(buf, "%d", total_len), buf), NULL))
				return (TCL_ERROR); /** -- EXIT (FAILURE) -> **/
		}

	/**
 	 **  Copy the argument on the buffer and put a space at the end
	 **/
		memcpy(bufp, Tcl_GetString(objv[i]), arg_len);
		bufp += arg_len;
		memcpy(bufp, " ", 1);
		bufp += 1;
	}

    /**
     **  For Modules, stdout must be directed to stderr so it
     **  isn't parsed by the evaluating shell.  We also must save it here so it
     **  can be restored after this command has been executed.
     **/
	saved_stdout = TieStdout();

	*(bufp - 1) = '\0';
	i = system(buf);

    /**
     **  Following the style of Tcl_ExecCmd, we can just return the
     **  raw result (appropriately shifted and masked) to Tcl
     **/
	sprintf(buf, "%d", (0xff & (i >> 8)));
	Tcl_SetResult(interp, buf, TCL_VOLATILE);

	/*
	 *  Restore stdout.
	 */
	UnTieStdout(saved_stdout);

	return (TCL_OK);

} /** End of 'cmdSystem' **/