DOS-only/dos.c

   1 /*
   2  * dos.c
   3  * Copyright (C) 2004 A.J. van Os; Released under GNU GPL
   4  *
   5  * Description:
   6  * DOS only functions
   7  */
   8
   9 #if defined(__DJGPP__)
  10 #define _NAIVE_DOS_REGS 1
  11 #endif /* __DJGPP__ */
  12 #include <dos.h>
  13 #include <string.h>
  14 #include "antiword.h"
  15
  16
  17 /*
  18  * iGetVersion - get the version of DOS
  19  *
  20  * Return the DOS version * 100 or -1 incase of error
  21  */
  22 static int
  23 iGetVersion(void)
  24 {
  25         union REGS      uRegs;
  26
  27         memset(&uRegs, 0, sizeof(uRegs));
  28         uRegs.h.ah = 0x30;
  29         uRegs.h.al = 0x00;
  30         _doserrno = 0;
  31         intdos(&uRegs, &uRegs);
  32         if (uRegs.x.cflag != 0) {
  33                 DBG_DEC(uRegs.x.cflag);
  34                 DBG_DEC(_doserrno);
  35                 return -1;
  36         }
  37         DBG_DEC(uRegs.h.al);
  38         DBG_DEC(uRegs.h.ah);
  39         return uRegs.h.al * 100 + uRegs.h.ah;
  40 } /* end of iGetVersion */
  41
  42 /*
  43  * iGetCodepage - get the DOS codepage
  44  *
  45  * Returns the number of the active codepage (cp437 is DOS ASCII)
  46  */
  47 int
  48 iGetCodepage(void)
  49 {
  50         union REGS      uRegs;
  51
  52         /* DOS function 0x66 first appeared in DOS 3.3 */
  53         if (iGetVersion() < 330) {
  54                 return 437;
  55         }
  56         memset(&uRegs, 0, sizeof(uRegs));
  57         uRegs.h.ah = 0x66;
  58         uRegs.h.al = 0x01;
  59         _doserrno = 0;
  60         intdos(&uRegs, &uRegs);
  61         if (uRegs.x.cflag != 0) {
  62                 DBG_DEC(uRegs.x.cflag);
  63                 DBG_DEC(_doserrno);
  64                 return 437;
  65         }
  66         DBG_DEC(uRegs.x.bx);
  67         DBG_DEC(uRegs.x.dx);
  68         return uRegs.x.bx;
  69 } /* end of iGetCodepage */