RE: [GD-Windows] sprintf weirdness

[Andras B. <bn...@ma...>]

> (1) Could it be that "buf" is somehow corrupted before you check its
>     contents?  Maybe try the following:
> 
>     sprintf( buf, "Hey!-->%.3f<--Look!", 0.05f );
> 
>     (making sure "buf" can handle the extra text) and see that the
>     stuff before and after the floating-point field appears in "buf"
>     as expected.

Tried that, and it's not corrupted (I can see the "Hey" "Look!" messages in
buf, but it's still "0." In the middle).


> (2) Try out the following code from MSDN -- perhaps changing "_fcvt"
>     to "_cfltcvt" as a wild guess if it fails to link with your crt0.
>     Maybe testing cases similar to your 0.05f case with this function
>     in particular will narrow down the problem.
> 
>   /* FCVT.C: This program converts the constant
>    * 3.1415926535 to a string and sets the pointer
>    * *buffer to point to that string.
>    */
> 
>   #include <stdlib.h>
>   #include <stdio.h>
> 
>   void main( void )
>   {
>    int  decimal, sign;
>    char *buffer;
>    double source = 3.1415926535;
> 
>    buffer = _fcvt( source, 7, &decimal, &sign );
>    printf( "source: %2.10f   buffer: '%s'   decimal: %d   sign: %d\n",
>             source, buffer, decimal, sign );
>   }
> 
>   // Output
>   // source: 3.1415926535   buffer: '31415927'   decimal: 1   sign: 0

_fcvt seems to work fine! Strange! So what does that mean?



> (3) Maybe put a memory breakpoint on "buf" to see when and how it is
>     modified.  Perhaps you'll find some unexpected modifications
>     shortly AFTER your sprintf() call, and BEFORE your examination
>     of the result.

Actually, I did step through printf, until the call of that _cfltcvt, when
the result immediately appeared in the buffer, so the only thing that could
screw up is _cfltcvt...



> (4) Finally, I don't want to raise any undue panic, but you might
>     be having psychotic hallucinations.  It goes without saying that
>     you are using your own crt0 on the advice of the voices in your head,
>     but the question is whether or not your paranoia has you believing
>     that space aliens tampered with your private crt0 to keep you
>     from learning more than "0." -- after all, knowing the full
>     value, 0.050, would expose the horrifying conspiracy.  For sure
>     the sys admins of your region of the Matrix would have to change
>     some parameters to restore balanced gameplay.


I have hallucinations all the time! I feel dizzy, and my eyes project words
into my brain written by some guy called Colin.. but I don't think he really
exists. I think he's just a helper bot installed into our brains (hmm, maybe
he's responsible for my recent memory leaks? I really need a decent garbage
collector!). Anyway, I don't fear the aliens, and I won't let them mess with
my crt0!!


Cheers,


Andras