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o for unknown int21 functions, set the CY bit to indicate failure

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o When reporting a int21 function we don't know about yet, report
  AH as the major and AL as the minor, as opposed to reporting AL
  as the major.
o Add support for 21:44:7: ioctl check output status.  We
  optimistically say that output is always ready.
o Add half support for 21:23: get file size.  We always now return
  failure.  This function isn't supported, according to the interrupt
  list, by the DOS box in windows, so I don't feel too bad.
This commit is contained in:
Warner Losh 1998-07-17 00:18:52 +00:00
parent 10f1d28ac1
commit 1b1101e52f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=37717
1 changed files with 34 additions and 2 deletions
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36
usr.bin/doscmd/dos.c
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@ -31,7 +31,7 @@
*
* BSDI int21.c,v 2.2 1996/04/08 19:32:51 bostic Exp
*
* $Id: dos.c,v 1.3 1998/07/02 05:12:52 imp Exp $
* $Id: dos.c,v 1.4 1998/07/16 23:54:23 imp Exp $
*/
#include "doscmd.h"
@ -707,6 +707,21 @@ int21_1a(regcontext_t *REGS)
return(0);
}
/*
** 21:23
**
** Get file size for fcb
** DS:DX -> unopened FCB, no wildcards.
** pcb random record field filled in with number of records, rounded up.
*/
static int
int21_23(regcontext_t *REGS)
{
debug(D_HALF, "Returning failure from get file size for fcb 21:23\n");
R_AL = 0xff;
return(0);
}
/*
** 21:25
**
@ -1474,6 +1489,19 @@ int21_44_1(regcontext_t *REGS)
return(0);
}
/*
** 21:44:7
**
** Get output status
*/
static int
int21_44_7(regcontext_t *REGS)
{
/* XXX Should really check to see if BX is open or not */
R_AX = 0xFF;
return(0);
}
/*
** 21:44:8
**
@ -2276,6 +2304,7 @@ static struct intfunc_table int21_table [] = {
{ 0x1b, IFT_NOSUBFUNC, int21_free, "get allocation for default drive"},
{ 0x1c, IFT_NOSUBFUNC, int21_free, "get allocation for specific drive"},
{ 0x1f, IFT_NOSUBFUNC, int21_NOFUNC, "get DPB for current drive"},
{ 0x23, IFT_NOSUBFUNC, int21_23, "Get file size (old)"},
{ 0x25, IFT_NOSUBFUNC, int21_25, "set interrupt vector"},
{ 0x26, IFT_NOSUBFUNC, int21_26, "create new PSP"},
{ 0x2a, IFT_NOSUBFUNC, int21_2a, "get date"},
@ -2308,6 +2337,7 @@ static struct intfunc_table int21_table [] = {
{ 0x43, IFT_NOSUBFUNC, int21_43, "get/set file attributes"},
{ 0x44, 0x00, int21_44_0, "ioctl(get)"},
{ 0x44, 0x01, int21_44_1, "ioctl(set)"},
{ 0x44, 0x07, int21_44_7, "ioctl(Check output status)"},
{ 0x44, 0x08, int21_44_8, "ioctl(test removable)"},
{ 0x44, 0x09, int21_44_9, "ioctl(test remote)"},
{ 0x45, IFT_NOSUBFUNC, int21_45, "dup"},
@ -2449,7 +2479,9 @@ int21(regcontext_t *REGS)
index = intfunc_find(int21_table, int21_fastlookup, R_AH, R_AL);
if (index == -1) { /* no matching functions */
unknown_int2(0x21, R_AL, REGS);
unknown_int3(0x21, R_AH, R_AL, REGS);
R_FLAGS |= PSL_C; /* Flag an error */
R_AX = 0xff;
return;
}