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From: pallas@Navajo.ARPA (Joseph Pallas)
Newsgroups: net.lang.c++
Subject: Re: porting C++
Message-ID: <370@Navajo.ARPA>
Date: Sun, 16-Feb-86 18:15:53 EST
Article-I.D.: Navajo.370
Posted: Sun Feb 16 18:15:53 1986
Date-Received: Tue, 18-Feb-86 03:29:37 EST
References: <4982@alice.uUCp>
Organization: Stanford University
Lines: 39

With respect to size/align files, I wrote this little bit of code in C 
that generates some (but not all) of the required information.  Can anyone
tell me why the compiler wants some of the more obscure stuff, and how I
can figure it out at runtime in a C program?

/* alignments tester */

struct c { char c1; char c2;};
struct s { char c; short s;};
struct i { char c; int i;};
struct l { char c; long l;};
struct f { char c; float f;};
struct d { char c; double d;};
struct ch { char c;};
struct st { char c; struct ch sc;};
struct wp { char c; int *wp;};
struct bp { char c; char *bp;};

#define CHECK(name,type,struc) printf("%s %d %d\n",\
	name, sizeof(type), sizeof(struc) - sizeof(type))

main()
  {
    CHECK("char", char, struct c);
    CHECK("short", short, struct s);
    CHECK("int", int, struct i);
    CHECK("long", long, struct l);
    CHECK("float", float, struct f);
    CHECK("double", double, struct d);
    CHECK("struct", struct ch, struct st);
    CHECK("wptr", int *, struct wp);
    CHECK("bptr", char *, struct bp);
  }


---
Joe Pallas
...decwrl!glacier!navajo!pallas
pallas@navajo.stanford.edu