[U-Boot-Users] [RFC/PATCH] Add expr command

[Scott Wood]

On Wed, Feb 13, 2008 at 03:20:56PM +0100, Andreas Schweigstill wrote:
> +	/* Validate arguments */
> +	if ((argc != 5) || (strlen(argv[3]) != 1)) {
> +		printf("Usage:\n%s\n", cmdtp->usage);
> +		return 1;
> +	}
> 
> May we rely on the compiler optimizing the above expression so
> strlen() != 1 will only be evaluated if argc == 5 ?

Short-circuit evaluation isn't optimization, it's the semantics of the C
language.

-Scott