hardcoded constants

[Chris Siebenmann]

In article <2636 at m2-net.UUCP> remmers at m-net.UUCP (John H. Remmers) writes:
...
>The space requirement for a string concatenation is a frequently-needed
>value; it's worth having a macro to represent it:
>	#define  Catspace(s,t)  (strlen(s) + strlen(t) + 1)
>In terms of this, the malloc() call can be written:
>	foo = malloc(Catspace(s,t) + sizeof('/'));

 For true safety, I'd write this as
 
 	foo = malloc(Catspace(s,t)*sizeof(char) + sizeof('/'));

(or redefine Catspace() to do this itself, depending on whether it
returns a character or byte count), just in case someone produces a
compiler where characters aren't single bytes. 

[Corrections gratefully accepted; I don't think ANSI mandated
sizeof(char) being one, although a lot of code will probably break if
it isn't.]
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