(( Last edit: 1 dec 89 ))


            Microcomputer C header files assumptions
            ========================================

To avoid having my C programs looking like a  tangle  of  macroes
and ifdefs,  I've started canonizing  the  header  files  for the
different C compilers I use.  My starting point is the draft ANSI
C standard,  with generous influence  from  Borlands  Turbo-C 2.0
and Microsoft C 5.1.

Below is what my programs assume about the standard header files.
If your compiler has  trouble  compiling  a  program  written  or
supported by me, the assumptions below should help you a long way
towards successful compilation.

(( If you don't want to hack the standard headers  supplied  with
your compiler,  you may create an extra  header named  "gh.h"  or
something, put everything in it, and include that. ))


DOS.H
=====

* There should exist a header named dos.h, which  should  contain
  macro definitions,  function declarations and  type definitions
  for the operating system functions.

* Dos.h is supplied with Turbo C and  Microsoft  C.  AZTEC  users
  should copy (or rename) IO.H to DOS.H.

* Dos.h  should  define  symbolic  names  for  the  file   system
  attribute flags.

  For MS-DOS, this should look like:

  #ifdef __MSDOS__
  #define _A_NORMAL 0x00 /* Normal (r/w) file         */
  #define _A_RDONLY 0x01 /* Read only attribute       */
  #define _A_HIDDEN 0x02 /* Hidden file               */
  #define _A_SYSTEM 0x04 /* System file               */
  #define _A_LABEL  0x08 /* Volume label              */
  #define _A_DIREC  0x10 /* Directory                 */
  #define _A_ARCH   0x20 /* Archive                   */
  #endif


STDIO.H
=======

* Stdio.h  should  define  symbolic  names  for   standard   file
  descriptors (see ref. 1, sec. 8.1, p. 160) as follows:

  #define STDIN  (0)
  #define STDOUT (1)
  #define STDERR (2)


References
----------

1) Brian W. Kernighan and Dennis M. Ritchie (1st edition):  The C
   Programming Language; Prentice-Hall, New Jersey, 1978.

2) Richard Relph:  Preparing for ANSI C; Dr. Dobb's Journal, vol.
   12, issue 7,  p. 16-23, M&T Publishing,  Redwood City,  August
   1987.

3) ISO/TC97/SC22/WG14-C, N369;   Programming  Language  C  (Final
   Working Draft), ISO, August 1987.

                                                         -gisle h

Comments, suggestions or flames to:
   smail: Gisle Hannemyr, Brageveien 3A, N-0452 Oslo, Norway.
   EAN:	  gisle@nr.uninett
   Inet:  gisle@ifi.uio.no
   UUCP:  ..!mcvax!ifi!gisle
   BBS:	  a number of Oslo based BBS's

..EOF