From: "Santosh H." <hsantosh AT giasbga DOT vsnl DOT net DOT in>
Newsgroups: comp.os.msdos.djgpp
Subject: printf & scanf behave shadily???Pls discuss
Date: Thu, 16 Sep 1999 07:57:01 +0530
Organization: VSNL
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi all,

     I think u chaps must've seen my posting about rep stosb causing a
gpf(General protection fault) at that very instruction every time.Well I
sorta think I found a bug in libc.In my C program that was calling the
asm procedures had 2 lines like this
    printf("Enter which gmode: ");
    scanf("%d",&mode);
followed by-   
    InitMode();
    InitGraphics();
    Drawline();    <- just a test proc that uses rep stosb for drawing

when those two printf & scanf are there the instruction sub edi,edi or any
other instruction using ei seems to go ignored & edi ends up with a value
of 000010000 when the linit of the segment is 000000ffff obviously causing
a gpf.The code runs fine when i add a mode = 0x0013 and comment out the
printf & scanf ??? So what's the problem here?Is it a bug in DJGPP or libc
or what.

    Have any of u run into the same problems before.?  Mind if this's got
something thing to do with an incompatibiity problem between mode 13h &
printf/scanf I'm doing the mode sets after I  call printf & scanf to' I
don't see how it is posible.
    
     Pls therefore gurus enlighten me on this aspect.



Santosh
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Santosh .H :
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