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From: mambuhl AT ripco DOT com (Martin Ambuhl)
Subject: mysterious error -- Need
Sender: usenet AT rci DOT ripco DOT com (Net News Admin)
Organization: Ripco Internet BBS Chicago
Date: Fri, 23 Jun 1995 07:38:32 GMT
Lines: 38
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

haasj AT infomatch DOT com (Jarrod Haas)
in <3sb51j$9bu AT berlin DOT infomatch DOT com> asks:

>I have this program that I'm writing under djgpp that refuses to run
>properly. It compiles fine with no warnings or errors, but at runtime if use
>1 or more command line paramaters, i get:


>RPG (Random Primitive Generator) 0.0 Beta -- Shape Generator for POV
>(C) 1995 Jarrod Haas, Random Conformity Soft.
>Segmentation violation in pointer 0x00000000 at d8:13ac
>blah blah blah
>call frame traceback EIPs:
>0x000013ac

almost all the information you posted is irrelevant (this is not a
flame, it is better to give more information than less);  the only
relevant code to your problem is:

>char **args;
.....

>  /*pass command line to global variable*/
>  for (c = 0; c <= argc; c++)
>  {
>    args[c] = argv[c];
>  }

args is never allocated any space, and (since global) is initialized to
NULL.  Attempts to assign to args[0] ... args[argc-1] are to parts of
memory not in your address space = "Segmentation violation".  Notice
that the violation occurs in a pointer 0x00000000, exactly what you
would expect when assigning using a NULL pointer.

                     
--
* Martin Ambuhl       net: mambuhl AT ripco DOT com
* Chicago, IL (USA)        martin DOT ambuhl AT chessboard DOT com