Date: Tue, 1 Jul 1997 15:50:58 -0400 (EDT)
From: "Art S. Kagel" <kagel AT ns1 DOT bloomberg DOT com>
To: DrkWatr <pawn AT dialnet DOT net>
Cc: djgpp AT delorie DOT com
Subject: Re: Newbie question
In-Reply-To: <01bc861c$7c3537c0$b5fa41ce@drkwatr>
Message-Id: <Pine.D-G.3.91.970701154421.372C-100000@dg1>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Precedence: bulk

On 1 Jul 1997, DrkWatr wrote:

> I am having problems using command line arguments in my programs. I am used
> to string handling in Turbo c++, so there is some differences in that
> aspect. But tell me what you see that is wrong with the code below. It is
> supposed to set the frame_skip variable according to the option -f2 if
> present.
> c:\game\source\freedom -f2
> int main(int argc, char *argv[ ]);

Are the semi-colon and missing braces for main() typos for this message 
or should the line above be:

int main(int argc, char *argv[]) 
{

> /* some miscellaneous code here */
> char arg_temp[10];
> strcpy (arg_temp, argv[1]);
> if ((arg_temp[0] == '-') && (arg_temp[1] == 'f'))
> frame_skip = atoi (arg_temp[2]);

This should be:
frame_skip = atoi( &arg_temp[2] );

> 
> The above code works in Turbo c, but chokes in DJGPP, with numerous
> warnings and errors. Also to debug it i would use a printf statement like
> the below.
> printf ("%s",arg_temp[1]);

This should be:

printf( "%s", &arg_temp[1] );


BTW:  look up the getopt() function in the info docs.  It is very 
powerful, can save you many hundred lines of code, and gives your 
programs a standard POSIX compliant command line interface.  You can also 
get the GNU getopt() source and compile that to gain long command flags 
(like --version_info and --help) and optional flags (ie accepting either 
-d or -d filename) and optional command argument rearrangement.  AFAIK 
GNU getopt is not GLPL protected, though one should check that as I have 
not looked in a while.

Art S. Kagel, kagel AT bloomberg DOT com