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Subject: Re: General Protection Fault error is intermittent
From: "K.J.Williams" <lordwilliams1972 AT gmail DOT com>
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On Sunday, June 23, 2013 8:54:27 AM UTC-7, Martin Str|mberg wrote:
> K.J.Williams <lordwilliams1972 AT gmail DOT com> wrote:
> 
> > Yeah I am not checking for a null pointer in the second use 
> 
> > of strtok() in my string_parser() to prevent me from copying 
> 
> > the string back to the calling statement. Thats not why 
> 
> > I posted my message here. You see, I wrote the program parstext.c 
> 
> > to test my function for the larger program that I want to implement 
> 
> > it for. But the problem is that DJGPP will not warn me about violating 
> 
> > memory boundaries with the parstext.c program as it does with the 
> 
> > bigger program WATT ( a project of several files ). I wanted to know 
> 
> > why isn't DJGPP warning me when I run parstext.c runs without complaints?   
> 
> > Its basically a segmented memory violation caused by strtok on following 
> 
> > calls.
> 
> 
> 
> It's WINDOWS's fault. It's DPMI host doesn't provide the functionality
> 
> that this requires. Try booting in plain DOS and run with CWSDPMI and
> 
> you should get a crash if you're using NULL pointers.
> 
> 

OK, Thanks. 

BTW, I found another bug with DJGPP 

if you have program that just uses :
 
#include<stdio.h>
#include<string.h> 

...and you use a function from ctype.h - as I did with isspace(), without including ctype.h in your includes ... DJGPP/GCC will NOT complain about it 
and will still compile it. I just discovered it and made the correction
to add #include<ctype.h> to save myself from future headaches. 

...Secondly, I found this strange, but some how the ANSI C or C++ standard doesn't consider the escape sequence '\b' (for backspace) as a white-space character when I use isspace() to check individual characters in a c-string. 

I just wanted to mention these two observations...

KJW