code.delx.au - gnu-emacs/blob - src/s/msdos.h

   1 /* System description file for MS-DOS
   2
   3 Copyright (C) 1993, 1996-1997, 2001-2012 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* Note: lots of stuff here was taken from s-msdos.h in demacs. */
  21
  22
  23 /* Define symbols to identify the version of Unix this is.
  24    Define all the symbols that apply correctly.  */
  25 #ifndef MSDOS
  26 #define MSDOS
  27 #endif
  28
  29 #ifndef __DJGPP__
  30 You lose; /* Emacs for DOS must be compiled with DJGPP */
  31 #endif
  32
  33 #define DOS_NT  /* MSDOS or WINDOWSNT */
  34
  35 /* subprocesses should be defined if you want to have code for
  36    asynchronous subprocesses (as used in M-x compile and M-x shell).
  37    This is the only system that needs this.  */
  38 #undef subprocesses
  39
  40 /* Here, on a separate page, add any special hacks needed to make
  41    Emacs work on this system.  For example, you might define certain
  42    system call names that don't exist on your system, or that do
  43    different things on your system and must be used only through an
  44    encapsulation (which you should place, by convention, in sysdep.c).  */
  45 \f
  46 /* This overrides the default value on editfns.c, since DJGPP
  47    does not have pw->pw_gecos.  */
  48 #define USER_FULL_NAME (getenv ("NAME"))
  49
  50 /* setjmp and longjmp can safely replace _setjmp and _longjmp,
  51    but they will run slower.  */
  52 #define _setjmp setjmp
  53 #define _longjmp longjmp
  54
  55 #define _NAIVE_DOS_REGS
  56
  57 /* Used by emacs.c:decode_env_path.  */
  58 #define SEPCHAR ';'
  59
  60 /* Used by callproc.c (and process.c, but in the part not compiled on
  61    MSDOS).  The default is defined on process.h.  */
  62 #define NULL_DEVICE "nul"
  63
  64 /* Used by floatfns.c.  */
  65 #define HAVE_INVERSE_HYPERBOLIC
  66 #define FLOAT_CHECK_DOMAIN
  67
  68 /* Start of gnulib-related stuff  */
  69
  70 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
  71    2.03 has it, but it also has _strtold as a stub that jumps to
  72    strtold, so use _strtold in all versions.  */
  73 #define strtold _strtold
  74
  75 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
  76 # define HAVE_LSTAT 1
  77 #else
  78 # define lstat stat
  79 #endif
  80
  81 /* End of gnulib-related stuff.  */
  82
  83 /* When $TERM is "internal" then this is substituted:  */
  84 #define INTERNAL_TERMINAL "pc|bios|IBM PC with color display:\
  85 :co#80:li#25:Co#16:pa#256:km:ms:cm=<CM>:cl=<CL>:ce=<CE>:\
  86 :se=</SO>:so=<SO>:us=<UL>:ue=</UL>:md=<BD>:mh=<DIM>:mb=<BL>:mr=<RV>:me=<NV>:\
  87 :AB=<BG %d>:AF=<FG %d>:op=<DefC>:"
  88
  89 /* Define this to be the separator between devices and paths.  Used by
  90    lisp.h to define IS_DEVICE_SEP.  */
  91 #define DEVICE_SEP ':'
  92
  93 /* We'll support either convention of slashes on MSDOS.  */
  94 #define IS_DIRECTORY_SEP(_c_) ((_c_) == '/' || (_c_) == '\\')
  95 #define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_) || IS_DEVICE_SEP (_c_))
  96
  97 /* Define one of these for easier conditionals.  */
  98 #ifdef HAVE_X_WINDOWS
  99 /* We need a little extra space, see ../../lisp/loadup.el and the
 100    commentary below, in the non-X branch.  The 140KB number was
 101    measured on GNU/Linux and on MS-Windows.  */
 102 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 103 #else
 104 /* We need a little extra space, see ../../lisp/loadup.el.
 105    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 106    overall, we end up wasting 130KB of pure space, because
 107    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 108    non-DOS specific files and load history; the latter is about 55K,
 109    but depends on the depth of the top-level Emacs directory in the
 110    directory tree).  Given the unknown policy of different DPMI
 111    hosts regarding loading of untouched pages, I'm not going to risk
 112    enlarging Emacs footprint by another 100+ KBytes.  */
 113 #define SYSTEM_PURESIZE_EXTRA (-170000+65000)
 114 #endif