No. of elements in initialized array

[VLD/VMB]

> ...  However, code that must look at term_tbl[] needs to know how many
> elements it has.  The solution we're using now is:
>
> #define TERMCOUNT (sizeof(term_tbl)/sizeof(struct termentry))
>
> This works fine on both our Pyramid and our Vaxen.  BUT...is this the preferred
> technique?  Isn't it possible on some machines that the structs may have to
> be padded out to some arbitrary word boundary or something in order to fit
> efficiently into the array (and thus sizeof(term_tbl) may not be an integer
> multiple of sizeof(struct termentry))?  Or will C compilers guarantee that that
> any necessary padding will be included in sizeof(struct)?

The padding is part of the "sizeof" the structure.

#define	number_of_elements(array)	(sizeof(array)/sizeof(array)[0])

This works unless your C compiler is badly broken.  (That CAN happen;
not very long ago I had to use one that insisted that sizeof a string
literal was equal to sizeof(char*).)