🚀 go-pugleaf

Wey Jing HO (sci240s@monu6.cc.monash.edu.au) wrote:
> PLEASE HELP ME!!
> 
> 
> Briefly, what I am trying to do:
> 1) declare unsigned char **variable;
> 2) variable = (unsigned char **)malloc(512*sizeof(unsigned char));
													^^^^^^^^^^^^^
BANG! BZZT! That should read (unsigned char *). You want 512 char arrays
not 512 chars. That is why you are getting the violations. If you look at
line 4) of your algorithm, you will see that you are storing (unsigned char
*)'s in the array which is only big enough to hold (unsigned char)'s. Hence
the error. A pointer is 4 bytes long whereas a char is only 1.

> 3) check malloc if == NULL;
> 4) variable[i] = (unsigned char *)malloc(512*sizeof(unsigned char)); 
>    for (i=0; i<512; i++); (sorry, this line should appear first)
> 5) check malloc if == NULL;
> 6) variable[row][col] = (unsigned char)fgetc(instream);
> 
> The program will break with the above SYS errors at row = 256 and col = 0
> (that means it manage to reach row = 255 and col = 511).

-- 
Tom J Parry.
Your reality is a figment of my imagination.