Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!decwrl!alverson
From: alverson@decwrl.dec.com (Robert Alverson)
Newsgroups: comp.arch
Subject: Re: RISC data alignment
Message-ID: <286@bacchus.DEC.COM>
Date: 18 Feb 88 05:13:23 GMT
References: <2635@calmasd.GE.COM> <28200092@ccvaxa> <496@ecrcvax.UUCP> <3001@bloom-beacon.MIT.EDU>
Reply-To: alverson@decwrl.UUCP (Robert Alverson)
Organization: Digital Equipment Corporation
Lines: 21

In article <3001@bloom-beacon.MIT.EDU> jfc@athena.mit.edu (John F Carr) writes:
>
> (&(s.a) - &(s.b)) == 1 it is making an unsupported assumption.  Can 
>someone post an example of a program which is portable and depends on
>the K&R rule quoted above?

How about this:

typedef struct VarStr_str { int len; char str[1]; } VarStr;

VarStr *MakStr(s) char *s; {
   VarStr *p = malloc(sizeof(VarStr) + strlen(s));
   strcpy(p->str, s);
   return p;
}


This is a commonly used technique to avoid another memory indirection
when accessing the variable data in the structure.

Bob