src/dosfns.c

   1 /* MS-DOS specific Lisp utilities.  Coded by Manabu Higashida, 1991.
   2    Major changes May-July 1993 Morten Welinder (only 10% original code left)
   3    Copyright (C) 1991, 1993 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 1, or (at your option)
  10 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; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21
  22 #include "config.h"
  23
  24 #ifdef MSDOS
  25 /* The entire file is within this conditional */
  26
  27 #include <stdio.h>
  28 #include <dos.h>
  29 #include "lisp.h"
  30 #include "buffer.h"
  31 #include "termchar.h"
  32 #include "termhooks.h"
  33 #include "frame.h"
  34 #include "dosfns.h"
  35 #include "msdos.h"
  36
  37 static void
  38 mode_resetsize ()
  39 {
  40   Fset_screen_width (ScreenCols (), Qnil);
  41   Fset_screen_height (ScreenRows (), Qnil);
  42 }
  43
  44 DEFUN ("mode25", Fmode25, Smode25, 0, 0, "",
  45   "Set the number of rows to 25.")
  46   ()
  47 {
  48   union REGS regs;
  49
  50   if (have_mouse) Mouse_off ();
  51   regs.x.ax = 3;
  52   int86 (0x10, &regs, &regs);
  53   regs.x.ax = 0x1101;
  54   regs.h.bl = 0;
  55   int86 (0x10, &regs, &regs);
  56   regs.x.ax = 0x1200;
  57   regs.h.bl = 32;
  58   int86 (0x10, &regs, &regs);
  59   regs.x.ax = 3;
  60   int86 (0x10, &regs, &regs);
  61   mode_resetsize ();
  62   Frecenter (Qnil);
  63   Fredraw_display ();
  64   if (have_mouse) Mouse_init ();
  65 }
  66
  67 DEFUN ("mode4350", Fmode4350, Smode4350, 0, 0, "",
  68   "Set the number of rows to 43 (EGA) or 50 (VGA).")
  69   ()
  70 {
  71   union REGS regs;
  72
  73   if (have_mouse) Mouse_off ();
  74   regs.x.ax = 3;
  75   int86 (0x10, &regs, &regs);
  76   regs.x.ax = 0x1112;
  77   regs.h.bl = 0;
  78   int86 (0x10, &regs, &regs);
  79   regs.x.ax = 0x1200;
  80   regs.h.bl = 32;
  81   int86 (0x10, &regs, &regs);
  82   regs.x.ax = 0x0100;
  83   regs.x.cx = 7;
  84   int86 (0x10, &regs, &regs);
  85   mode_resetsize ();
  86   Frecenter (Qnil);
  87   Fredraw_display ();
  88   if (have_mouse) Mouse_init ();
  89 }
  90
  91 DEFUN ("int86", Fint86, Sint86, 2, 2, 0,
  92   "Call specific MSDOS interrupt number INTERRUPT with REGISTERS.\n\
  93 Return the updated REGISTER vector.\n\
  94 \n\
  95 INTERRUPT should be an integer in the range 0 to 255.\n\
  96 REGISTERS should be a vector produced by `make-register' and\n\
  97 `set-register-value'.")
  98   (intno, regs)
  99   Lisp_Object intno, regs;
 100 {
 101   register int i;
 102   int no;
 103   union REGS inregs, outregs;
 104   Lisp_Object val;
 105
 106   CHECK_NUMBER (intno, 0);
 107   no = (unsigned long) XINT (intno);
 108   CHECK_VECTOR (regs, 1);
 109   if (no < 0 || no > 0xff || XVECTOR (regs)-> size != 8)
 110     return Qnil;
 111   for (i = 0; i < 8; i++)
 112     CHECK_NUMBER (XVECTOR (regs)->contents[i], 1);
 113
 114   inregs.x.ax    = (unsigned long) XFASTINT (XVECTOR (regs)->contents[0]);
 115   inregs.x.bx    = (unsigned long) XFASTINT (XVECTOR (regs)->contents[1]);
 116   inregs.x.cx    = (unsigned long) XFASTINT (XVECTOR (regs)->contents[2]);
 117   inregs.x.dx    = (unsigned long) XFASTINT (XVECTOR (regs)->contents[3]);
 118   inregs.x.si    = (unsigned long) XFASTINT (XVECTOR (regs)->contents[4]);
 119   inregs.x.di    = (unsigned long) XFASTINT (XVECTOR (regs)->contents[5]);
 120   inregs.x.cflag = (unsigned long) XFASTINT (XVECTOR (regs)->contents[6]);
 121   inregs.x.flags = (unsigned long) XFASTINT (XVECTOR (regs)->contents[7]);
 122
 123   int86 (no, &inregs, &outregs);
 124
 125   XVECTOR (regs)->contents[0] = make_number (outregs.x.ax);
 126   XVECTOR (regs)->contents[1] = make_number (outregs.x.bx);
 127   XVECTOR (regs)->contents[2] = make_number (outregs.x.cx);
 128   XVECTOR (regs)->contents[3] = make_number (outregs.x.dx);
 129   XVECTOR (regs)->contents[4] = make_number (outregs.x.si);
 130   XVECTOR (regs)->contents[5] = make_number (outregs.x.di);
 131   XVECTOR (regs)->contents[6] = make_number (outregs.x.cflag);
 132   XVECTOR (regs)->contents[7] = make_number (outregs.x.flags);
 133
 134   return regs;
 135 }
 136
 137 int dos_country_code;
 138 int dos_codepage;
 139 Lisp_Object Vdos_version;
 140
 141 void
 142 init_dosfns ()
 143 {
 144   union REGS regs;
 145   _go32_dpmi_seginfo info;
 146   _go32_dpmi_registers dpmiregs;
 147
 148   get_lim_data (); /* why the hell isn't this called elsewhere? */
 149
 150   regs.x.ax = 0x3000;
 151   intdos (&regs, &regs);
 152   Vdos_version = Fcons (make_number (regs.h.al), make_number (regs.h.ah));
 153
 154   /* Obtain the country code by calling Dos via Dpmi.  Don't rely on GO32.  */
 155   info.size = (34 + 15) / 16;
 156   if (_go32_dpmi_allocate_dos_memory (&info))
 157     dos_country_code = 1;
 158   else
 159     {
 160       dpmiregs.x.ax = 0x3800;
 161       dpmiregs.x.ds = info.rm_segment;
 162       dpmiregs.x.dx = 0;
 163       dpmiregs.x.ss = dpmiregs.x.sp = 0;
 164       _go32_dpmi_simulate_int (0x21, &dpmiregs);
 165       dos_country_code = dpmiregs.x.bx;
 166       _go32_dpmi_free_dos_memory (&info);
 167     }
 168
 169   regs.x.ax = 0x6601;
 170   intdos (&regs, &regs);
 171   if (regs.x.cflag)
 172     /* Estimate code page from country code */
 173     switch (dos_country_code)
 174       {
 175       case 45: /* Denmark */
 176       case 47: /* Norway */
 177         dos_codepage = 865;
 178         break;
 179       default:
 180         /* US */
 181         dos_codepage = 437;
 182       }
 183   else
 184     dos_codepage = regs.x.bx & 0xffff;
 185 }
 186 \f
 187 /*
 188  *      Define everything
 189  */
 190 syms_of_dosfns ()
 191 {
 192   defsubr (&Smode25);
 193   defsubr (&Smode4350);
 194   defsubr (&Sint86);
 195
 196   DEFVAR_INT ("dos-country-code", &dos_country_code,
 197     "The country code returned by Dos when Emacs was started.\n\
 198 Usually this is the international telephone prefix.");
 199
 200   DEFVAR_INT ("dos-codepage", &dos_codepage,
 201               "The codepage active when Emacs was started.\n\
 202 The following are known:
 203         437     US
 204         850     Multilingual
 205         852     Slavic/Latin II
 206         857     Turkish
 207         860     Portugal
 208         861     Iceland
 209         863     Canada (French)
 210         865     Norway/Denmark");
 211
 212   DEFVAR_LISP ("dos-version", &Vdos_version,
 213     "The (MAJOR . MINOR) Dos version (subject to modification with setver).");
 214 }
 215 #endif /* MSDOS */