src/s/msdos.h

   1 /* System description file for MS-DOS
   2
   3    Copyright (C) 1993, 1996, 1997, 2001, 2002, 2003, 2004, 2005, 2006,
   4                  2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software: you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation, either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* Note: lots of stuff here was taken from s-msdos.h in demacs. */
  22
  23
  24 /*
  25  *      Define symbols to identify the version of Unix this is.
  26  *      Define all the symbols that apply correctly.
  27  */
  28
  29 #ifndef MSDOS
  30 #define MSDOS
  31 #endif
  32
  33 #ifdef __GO32__
  34 #ifndef __DJGPP__
  35 #define __DJGPP__ 1     /* V2 defines __DJGPP__ == 2 */
  36 #endif
  37 #else
  38 You lose; /* Emacs for DOS must be compiled with DJGPP */
  39 #endif
  40
  41 #define DOS_NT  /* MSDOS or WINDOWSNT */
  42 #undef BSD_SYSTEM
  43
  44 /* SYSTEM_TYPE should indicate the kind of system you are using.
  45  It sets the Lisp variable system-type.  */
  46
  47 #define SYSTEM_TYPE "ms-dos"
  48
  49 #define SYMS_SYSTEM syms_of_dosfns();syms_of_msdos();syms_of_win16select()
  50
  51 /* NOMULTIPLEJOBS should be defined if your system's shell
  52  does not have "job control" (the ability to stop a program,
  53  run some other program, then continue the first one).  */
  54
  55 #define NOMULTIPLEJOBS
  56
  57 #define SYSV_SYSTEM_DIR
  58
  59 /* Define this symbol if your system has the functions bcopy, etc. */
  60
  61 #define BSTRING
  62
  63 /* Define this is the compiler understands `volatile'.  */
  64 #define HAVE_VOLATILE
  65
  66
  67 /* subprocesses should be defined if you want to
  68    have code for asynchronous subprocesses
  69    (as used in M-x compile and M-x shell).
  70    This is the only system that needs this.  */
  71
  72 #undef subprocesses
  73
  74 /* If your system uses COFF (Common Object File Format) then define the
  75    preprocessor symbol "COFF". */
  76
  77 #define COFF
  78
  79 /* Here, on a separate page, add any special hacks needed
  80    to make Emacs work on this system.  For example,
  81    you might define certain system call names that don't
  82    exist on your system, or that do different things on
  83    your system and must be used only through an encapsulation
  84    (Which you should place, by convention, in sysdep.c).  */
  85 \f
  86 /* Avoid incompatibilities between gmalloc.c and system header files
  87    in how to declare valloc.  */
  88 #define GMALLOC_INHIBIT_VALLOC
  89
  90 /* This overrides the default value on editfns.c, since DJGPP
  91    does not have pw->pw_gecos.  */
  92 #define USER_FULL_NAME (getenv ("NAME"))
  93
  94 /* setjmp and longjmp can safely replace _setjmp and _longjmp,
  95    but they will run slower.  */
  96
  97 #define _setjmp setjmp
  98 #define _longjmp longjmp
  99
 100 #if __DJGPP__ < 2
 101
 102 /* New chdir () routine.
 103    DJGPP v2.0 and later doesn't need it because its chdir() does
 104    set the drive itself. */
 105 #ifdef chdir
 106 #undef chdir
 107 #endif
 108 #define chdir sys_chdir
 109
 110 #define LIBS_SYSTEM -lpc  /* isn't required in DJGPP v2.0, either */
 111
 112 #endif /* __DJGPP__ < 2 */
 113
 114 #if __DJGPP__ > 1
 115
 116 #define DATA_START  (&etext + 1)
 117 #define TEXT_START  &start
 118
 119 #define _NAIVE_DOS_REGS
 120
 121 #else /* not __DJGPP__ > 1 */
 122
 123 /* This somehow needs to be defined even though we use COFF.  */
 124 #define TEXT_START -1
 125
 126 #endif /* not __DJGPP__ > 1 */
 127
 128 #define ORDINARY_LINK
 129
 130 /* command.com does not understand `...` so we define this.  */
 131 #define LIB_GCC -Lgcc
 132 #define SEPCHAR ';'
 133
 134 #define NULL_DEVICE "nul"
 135
 136 #if __DJGPP__ < 2
 137 #define O_RDONLY        0x0001
 138 #define O_WRONLY        0x0002
 139 #define O_RDWR          0x0004
 140 #define O_CREAT         0x0100
 141 #define O_TRUNC         0x0200
 142 #define O_EXCL          0x0400
 143 #define O_APPEND        0x0800
 144 #define O_TEXT          0x4000
 145 #define O_BINARY        0x8000
 146 #define NO_MATHERR
 147 #endif
 148
 149 #define HAVE_INVERSE_HYPERBOLIC
 150 #define FLOAT_CHECK_DOMAIN
 151
 152 /* When $TERM is "internal" then this is substituted:  */
 153 #define INTERNAL_TERMINAL "pc|bios|IBM PC with color display:\
 154 :co#80:li#25:Co#16:pa#256:km:ms:cm=<CM>:cl=<CL>:ce=<CE>:\
 155 :se=</SO>:so=<SO>:us=<UL>:ue=</UL>:md=<BD>:mh=<DIM>:mb=<BL>:mr=<RV>:me=<NV>:\
 156 :AB=<BG %d>:AF=<FG %d>:op=<DefC>:"
 157
 158 /* Define this to a function (Fdowncase, Fupcase) if your file system
 159    likes that */
 160 #define FILE_SYSTEM_CASE Fmsdos_downcase_filename
 161
 162 /* Define this to be the separator between devices and paths */
 163 #define DEVICE_SEP ':'
 164
 165 /* We'll support either convention on MSDOG.  */
 166 #define IS_DIRECTORY_SEP(_c_) ((_c_) == '/' || (_c_) == '\\')
 167 #define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_) || IS_DEVICE_SEP (_c_))
 168
 169 /* Call init_gettimeofday when TZ changes.  */
 170 #if __DJGPP__ < 2
 171 #define LOCALTIME_CACHE
 172 #define tzset init_gettimeofday
 173 #endif
 174
 175 /* bcopy under djgpp is quite safe */
 176 #define GAP_USE_BCOPY
 177 #define BCOPY_UPWARD_SAFE 1
 178 #define BCOPY_DOWNWARD_SAFE 1
 179
 180 /* Mode line description of a buffer's type.  */
 181 #define MODE_LINE_BINARY_TEXT(buf) (NILP(buf->buffer_file_type) ? "T" : "B")
 182
 183 /* Do we have POSIX signals?  */
 184 #if __DJGPP__ > 1
 185 #define POSIX_SIGNALS
 186 #endif
 187
 188 /* We have (the code to control) a mouse.  */
 189 #define HAVE_MOUSE
 190
 191 /* We canuse mouse menus.  */
 192 #define HAVE_MENUS
 193
 194 /* Define one of these for easier conditionals.  */
 195 #ifdef HAVE_X_WINDOWS
 196 /* We need a little extra space, see ../../lisp/loadup.el and the
 197    commentary below, in the non-X branch.  The 140KB number was
 198    measured on GNU/Linux and on MS-WIndows.  */
 199 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 200 #define LIBX11_SYSTEM -lxext -lsys
 201 #else
 202 /* We need a little extra space, see ../../lisp/loadup.el.
 203    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 204    overall, we end up wasting 130KB of pure space, because
 205    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 206    non-DOS specific files and load history; the latter is about 55K,
 207    but depends on the depth of the top-level Emacs directory in the
 208    directory tree).  Given the unknown policy of different DPMI
 209    hosts regarding loading of untouched pages, I'm not going to risk
 210    enlarging Emacs footprint by another 100+ KBytes.  */
 211 #define SYSTEM_PURESIZE_EXTRA (-170000+65000)
 212 #endif
 213
 214 /* Tell the garbage collector that setjmp is known to save all
 215    registers relevant for conservative garbage collection in the
 216    jmp_buf.  */
 217
 218 #define GC_SETJMP_WORKS 1
 219 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 220
 221 /* arch-tag: d184f860-815d-4ff4-8187-d05c0f3c37d0
 222    (do not change this comment) */