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 #undef BSD_SYSTEM
  35
  36 /* subprocesses should be defined if you want to have code for
  37    asynchronous subprocesses (as used in M-x compile and M-x shell).
  38    This is the only system that needs this.  */
  39 #undef subprocesses
  40
  41 /* Here, on a separate page, add any special hacks needed to make
  42    Emacs work on this system.  For example, you might define certain
  43    system call names that don't exist on your system, or that do
  44    different things on your system and must be used only through an
  45    encapsulation (which you should place, by convention, in sysdep.c).  */
  46 \f
  47 /* Avoid incompatibilities between gmalloc.c and system header files
  48    in how to declare valloc.  */
  49 #define GMALLOC_INHIBIT_VALLOC
  50
  51 /* This overrides the default value on editfns.c, since DJGPP
  52    does not have pw->pw_gecos.  */
  53 #define USER_FULL_NAME (getenv ("NAME"))
  54
  55 /* setjmp and longjmp can safely replace _setjmp and _longjmp,
  56    but they will run slower.  */
  57 #define _setjmp setjmp
  58 #define _longjmp longjmp
  59
  60 #define DATA_START  (&etext + 1)
  61
  62 #define _NAIVE_DOS_REGS
  63
  64 /* command.com does not understand `...` so we define this.  */
  65 #define SEPCHAR ';'
  66
  67 #define NULL_DEVICE "nul"
  68
  69 #define HAVE_INVERSE_HYPERBOLIC
  70 #define FLOAT_CHECK_DOMAIN
  71
  72 /* Start of gnulib-related stuff  */
  73
  74 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
  75    2.03 has it, but it also has _strtold as a stub that jumps to
  76    strtold, so use _strtold in all versions.  */
  77 #define strtold _strtold
  78
  79 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
  80 # define HAVE_LSTAT 1
  81 #else
  82 # define lstat stat
  83 #endif
  84
  85 /* End of gnulib-related stuff.  */
  86
  87 /* When $TERM is "internal" then this is substituted:  */
  88 #define INTERNAL_TERMINAL "pc|bios|IBM PC with color display:\
  89 :co#80:li#25:Co#16:pa#256:km:ms:cm=<CM>:cl=<CL>:ce=<CE>:\
  90 :se=</SO>:so=<SO>:us=<UL>:ue=</UL>:md=<BD>:mh=<DIM>:mb=<BL>:mr=<RV>:me=<NV>:\
  91 :AB=<BG %d>:AF=<FG %d>:op=<DefC>:"
  92
  93 /* Define this to a function (Fdowncase, Fupcase) if your file system
  94    likes that.  */
  95 #define FILE_SYSTEM_CASE Fmsdos_downcase_filename
  96
  97 /* Define this to be the separator between devices and paths.  */
  98 #define DEVICE_SEP ':'
  99
 100 /* We'll support either convention on MSDOG.  */
 101 #define IS_DIRECTORY_SEP(_c_) ((_c_) == '/' || (_c_) == '\\')
 102 #define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_) || IS_DEVICE_SEP (_c_))
 103
 104
 105 /* Mode line description of a buffer's type.  */
 106 #define MODE_LINE_BINARY_TEXT(buf) (NILP(B_(buf,buffer_file_type)) ? "T" : "B")
 107
 108 /* We have (the code to control) a mouse.  */
 109 #define HAVE_MOUSE
 110
 111 /* We can use mouse menus.  */
 112 #define HAVE_MENUS
 113
 114 /* Define one of these for easier conditionals.  */
 115 #ifdef HAVE_X_WINDOWS
 116 /* We need a little extra space, see ../../lisp/loadup.el and the
 117    commentary below, in the non-X branch.  The 140KB number was
 118    measured on GNU/Linux and on MS-Windows.  */
 119 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 120 #else
 121 /* We need a little extra space, see ../../lisp/loadup.el.
 122    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 123    overall, we end up wasting 130KB of pure space, because
 124    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 125    non-DOS specific files and load history; the latter is about 55K,
 126    but depends on the depth of the top-level Emacs directory in the
 127    directory tree).  Given the unknown policy of different DPMI
 128    hosts regarding loading of untouched pages, I'm not going to risk
 129    enlarging Emacs footprint by another 100+ KBytes.  */
 130 #define SYSTEM_PURESIZE_EXTRA (-170000+65000)
 131 #endif
 132
 133 /* Tell the garbage collector that setjmp is known to save all
 134    registers relevant for conservative garbage collection in the jmp_buf.  */
 135 #define GC_SETJMP_WORKS 1