Porting to RISC OS

[Stefan Bellon]

Hi!

I've ported bogofilter to the rarely known operating system RISC OS.
Depending on which RISC OS compiler I use, I run into trouble with the
xmalloc/xcalloc functions.

At present, it may be possible that malloc(0) is called and afterwards
it's checked what happened. I think it may be safer to rewrite the code
to read as follows:

void *
xmalloc(size_t size){
    void *ptr;
    if (size == 0)
        size = 1;
    ptr = malloc(size);
    if (ptr == NULL) {
        xmem_error("xmalloc"); 
    }
    return ptr;
}

void *
xcalloc(size_t nmemb, size_t size){
   void *ptr;
   if (nmemb == 0)
       nmemb = 1;
   if (size == 0)
       size = 1;
   ptr = calloc(nmemb, size);
   if (ptr == NULL) {
       xmem_error("xcalloc");
   }
   return ptr;
}

In fact, I had to rewrite it this way in order to work-around what
seems to be a bug in our UnixLib when compiling with the Norcroft C
compiler. When using GCC it works with the present code as well.

Greetings,

Stefan.

-- 
Hard work has a future payoff.  Laziness pays off now.