Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!mcnc!rti!mozart!walker
From: walker@unx.sas.com (Doug Walker)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Writing small code in SAS/C 5.10
Message-ID: <1990Oct01.212023.9242@unx.sas.com>
Date: 1 Oct 90 21:20:23 GMT
References: <13148@leadsv.UUCP>
Organization: SAS Institute Inc.
Lines: 47

In article <13148@leadsv.UUCP> lord@leadsv.UUCP (Parker Lord) writes:
>I wrote myself a unix like 'mv' command because the AmigaDOS rename seemed
>to limited.  My problem is that the linked code comes out to be about 9K.
>I used the SD SC ND flags with Blink.  I thought that this was rather large
>for the amount of code actually written so I tried a test.  I wrote a one line
>program that does nothing more than a printf("Hello\n");  I compiled and linked
>this using lc -L.  This code came out at about 4.6K.  In comparison, the
>AmigaDOS rename command is less than 1K and the ARP mv command is about 1K.
>Are there some general guidelines to follow to make linked code smaller?  
>I also invoked the global optimizer with lc, but that didn't help at all.

If you can do without stdin/stdout/stderr, I suggest using the __tinymain
stuff in the compiler - see the manual for details.  If you want to do
even more, you can call your main routine _main instead of main and do
without almost all of the C startup - if you do this, you won't get
argc and argv as parameters, you'll get a pointer to the command line and
that's it.  Almost all of the overhead in the program you listed is due
to this overhead.  Try the following for a 132-byte program to do what
yours does:

#include <proto/exec.h>
#include <proto/dos.h>

struct DosLibrary *DOSBase;

void foo(void)
{
   DOSBase = OpenLibrary("dos.library", 0);
   Write(Output(), "Hello\n", 6);
   CloseLibrary(DOSBase);
}

Use the following to compile and link it:

lc foo
blink from foo.o to foo

Note that you don't link with c.o, and you don't link with lc.lib or
amiga.lib. 


  *****
=*|_o_o|\\=====Doug Walker, Software Distiller====== BBS: (919)460-7430 =
 *|. o.| ||
  | o  |//     For all you do, this bug's for you!
  ====== 
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