::: Area #157 (comp.sys.acorn.programmer)
Message: #34788 (Read 4 times, has 0 replies, 1488 bytes)
Date   : Thu Aug  6 14:29:52 1998
From   : Phil Norman of fidonet#2:254/27.2
To     : All
Subject: Re: Help Needed with getenv (C)

On Wed, 5 Aug 1998, Stewart Brodie wrote:

> char *Strdup(const char *s1)
> {
>       if (s1 == NULL) {
>               return NULL;
>       }
>       else {
>               const size_t length = strlen(s1) + 1;
>               char *const s2 = malloc(length);
>
>               if (s2 == NULL) return NULL;
>               return memcpy(s2, s1, length);
>       }
> }

Nah, you don't wanna do that, you wanna do this:

strcpy((newstring=(char *)malloc(1+strlen(source)))? newstring :
	 (exit(1), 0), source);

Note the interesting use of (exit(1), 0).  The above line won't compile
without this evil appendage because the return type of exit(1) is void,
and you can't typecase a void to anything else, and the return type of the
?: thingy cannot be void.

Fun eh?

Enjoy,
Phil

P.S. I'd like to point out, before I get flamed to death, that I would
never, NEVER use this in any code.  Other than the one time, but that was
just to check if it really did work (it did).

--
Rule of programming #1: Everything that can go wrong will go wrong,
	 except when you're running the debugger.

Phil Norman, mailing from Oregan Networks.
email:  forrey@eh.org
URL:    http://newton.ex.ac.uk/general/ug/norman

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