Array alignment on HPUX Post: 302145047

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Top Forums Programming Array alignment on HPUX Post 302145047 by rimon on Monday 12th of November 2007 03:04:45 PM

11-12-2007

Registered User

Array alignment on HPUX

Hi,

I'm porting code from Windows to HP-UX 11.23, using gcc (I'm begining to suspect this might not be the best choice, but I thought it would be most compatible since we've already compiled on Linux with gcc).

I have in my code something similar to the folowing:

Code:

unsigned char *ch_arr = new (unsigned char)[20];
unsigned char ptr = ch_arr + 10;
unsigned int number = 100;

*((unsigned int *)ptr - 1) = number;

The last line gives a segmentation fault.
In fact, I have found that its enough to write the following in order to crash:

Code:

unsigned char *ch_arr = new (unsigned char)[20];
unsigned int number = 100;

ch_arr[2] = number;

And the same is true for any index in the array which does not divide by 4.
I assume this is an alignment problem. If I were writing new code I could work around it, but since I am porting code this is a problem. Apparently the code uses this type of code, treating char arrays as memory buffers for different types, in many places and it would be very difficult to find them all and fix them.

Is there any compilation flag that could change the alignment for me?
Any other ideas for a global fix for this?

Thanks!

RO

rimon

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caca_conio_text_info(3caca)					      libcaca					       caca_conio_text_info(3caca)

NAME

       caca_conio_text_info -

       DOS text area information.

SYNOPSIS

   Data Fields
       unsigned char winleft
       unsigned char wintop
       unsigned char winright
       unsigned char winbottom
       unsigned char attribute
       unsigned char normattr
       unsigned char currmode
       unsigned char screenheight
       unsigned char screenwidth
       unsigned char curx
       unsigned char cury

Detailed Description
       This structure stores text area information for the DOS conio.h compatibility layer.

Field Documentation
   unsigned char caca_conio_text_info::winleft left window coordinate
   unsigned char caca_conio_text_info::wintop top window coordinate
   unsigned char caca_conio_text_info::winright right window coordinate
   unsigned char caca_conio_text_info::winbottom bottom window coordinate
   unsigned char caca_conio_text_info::attribute text attribute
   unsigned char caca_conio_text_info::normattr normal attribute
   unsigned char caca_conio_text_info::currmode current video mode: BW40, BW80, C40, C80, or C4350
   unsigned char caca_conio_text_info::screenheight text screen's height
   unsigned char caca_conio_text_info::screenwidth text screen's width
   unsigned char caca_conio_text_info::curx x-coordinate in current window
   unsigned char caca_conio_text_info::cury y-coordinate in current window
Author
       Generated automatically by Doxygen for libcaca from the source code.

Version 0.99.beta18						  Fri Apr 6 2012				       caca_conio_text_info(3caca)