From: "The Advisor" <TheAdvisor AT cadvision DOT com>
Newsgroups: comp.os.msdos.djgpp
References: <382f603a AT news DOT cadvision DOT com> <382f6cb9 AT news DOT cadvision DOT com>
Subject: Re: SIGSEGV - oh how we love you
Date: Tue, 16 Nov 1999 01:56:24 -0700
Lines: 59
Organization: Anarchy Incorporated
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200
NNTP-Posting-Host: 207.148.129.70
X-Original-NNTP-Posting-Host: 207.148.129.70
Message-ID: <38311cbf@news.cadvision.com>
X-Trace: 16 Nov 1999 01:58:39 -0700, 207.148.129.70
X-Original-NNTP-Posting-Host: 204.50.1.43
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

okay I got it. I got an email about SYMIFY and that really helped..
I was adding the char to a linked list, but somehow it was trying to read
current_char->next when current_char was NULL..

reminder: initialize and check  pointers before use.

( sheepish grin... )

The Advisor ( TheAdvisor AT cadvison DOT com )

The Advisor <TheAdvisor AT cadvision DOT com> wrote in message
news:382f6cb9 AT news DOT cadvision DOT com...
> Wow! just when you think you've got it all figured out... out pops another
> SIGSEGV.. I guess the problem still lies somewhere....
>
>
> The Advisor <TheAdvisor AT cadvision DOT com> wrote in message
> news:382f603a AT news DOT cadvision DOT com...
> > From The Advisor- TheAdvisor AT cadvision DOT com ...
> >
> > Can anybody help me figure out why I'm getting a SIGSEGV?
> >
> > Okay here's a snippet of my program: ( this is in a loop to constantly
get
> > keys from the user and store them in a linked list... )
> >    int ch;
> >    ch = readkey();
> >    switch(ch >> 8) {
> >        case KEY_ENTER: { printf("\n"); break; }
> >        default: { if(((ch & 0xff) >= 32) && ((ch2 & 0xff) <= 255))
> >  printf("%c", (ch & 0xff)); }
> >       }
> >
> > Shutting down Allegro
> > Exiting due to signal SIGSEGV
> >
> > General Protection Fault at eip=00001796
> > eax=ffffffff ebx=00008454 ecx=000ca7a4 edx=000ca790 esi=00000054
> > edi=0004a370
> > ebp=000ca300 esp=000ca2e8 program=D:\PROGRAMS\CEDIT\TEST\CHARTEST.EXE
> > cs: sel=00a7  base=84547000  limit=fed80fff
> > ds: sel=00af  base=84547000  limit=fed80fff
> > es: sel=00af  base=84547000  limit=fed80fff
> > fs: sel=00c7  base=00000000  limit=0010ffff
> > gs: sel=00c7  base=00000000  limit=0010ffff
> > ss: sel=00af  base=84547000  limit=fed80fff
> > App stack: [000ca370..0004a370]  Exceptn stack: [0004a250..00048310]
> >
> > Call frame traceback EIPs:
> >   0x00001796
> >   0x00001f44
> >   0x000285ae
> >
> >
> >
>
>