From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paul Crawford <psc@sat.dundee.ac.uk>
Subject: Re: DOS program recording it's parameters and environment?
Date: Thu, 16 Feb 2012 21:01:53 +0000
Message-ID: <4F3D6EC1.4050100@sat.dundee.ac.uk>
References: <4F165699.1080204@hanzlici.cz> <4F229215.1040801@sat.dundee.ac.uk> <4F3D50CF.4000004@hanzlici.cz>
Mime-Version: 1.0
Content-Type: multipart/mixed;
 boundary="------------010000000107020108060909"
Return-path: <linux-msdos-owner@vger.kernel.org>
In-Reply-To: <4F3D50CF.4000004@hanzlici.cz>
Sender: linux-msdos-owner@vger.kernel.org
List-ID: <linux-msdos.vger.kernel.org>
To: Frantisek Hanzlik <franta@hanzlici.cz>
Cc: DOSEMU/FreeDOS <linux-msdos@vger.kernel.org>, Freedos user list <freedos-user@lists.sourceforge.net>

This is a multi-part message in MIME format.
--------------010000000107020108060909
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

Dear Frantisek,
> compiler v1.9 (http://www.openwatcom.org/) for DOS. And there I knock
> to problem - it seems as this compiler not support construction:
>
> int main(int argc, char *argv[], char *envp[])

I think this 3rd argument may be a MS-specific extension, as most C 
programs just have argc & argv in the call to main();

If you change to use the 'environ' variable, that should be pre-defined 
(probably in stdlib.h) and should do the same job. Attached is an 
example that seems to compile & work under C6 DOS compiler and with gcc 
on my Ubuntu 10.04 box.

Regards,
Paul

--------------010000000107020108060909
Content-Type: text/x-csrc;
 name="dosenv.c"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="dosenv.c"



#include <stdio.h>
#include <stdlib.h>

extern char **environ;

int main(int argc, char *argv[])
{
int ii;
FILE *fp;
char **envp = environ;


	fp=fopen("dosenv.txt", "wb");
	if(fp != NULL)
		{
		fprintf(fp, "argc = %d\n", argc);

		for(ii=0; ii<argc; ii++)
			{
			fprintf(fp, "argv[%d] = %s\n", ii, argv[ii]);
			}

		ii=0;
		while(envp != NULL && envp[ii] != NULL)
			{
			fprintf(fp, "envp[%d] = %s\n", ii, envp[ii]);
			ii++;
			}

		fclose(fp);
		}


return 0;
}

--------------010000000107020108060909--