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fix undocumented error handling of dos freesize check for non-present floppy drives

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3139
This commit is contained in:
Sebastian Strohhäcker 2008-04-03 18:28:19 +00:00
parent f22cb0236b
commit e43272326e
1 changed files with 12 additions and 3 deletions
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15
src/dos/dos.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: dos.cpp,v 1.109 2008-03-12 17:45:39 c2woody Exp $ */
/* $Id: dos.cpp,v 1.110 2008-04-03 18:28:19 c2woody Exp $ */
#include <stdlib.h>
#include <string.h>
@ -435,13 +435,22 @@ static Bitu DOS_21Handler(void) {
{
Bit16u bytes,clusters,free;
Bit8u sectors;
if(DOS_GetFreeDiskSpace(reg_dl,&bytes,&sectors,&clusters,&free)) {
if (DOS_GetFreeDiskSpace(reg_dl,&bytes,&sectors,&clusters,&free)) {
reg_ax=sectors;
reg_bx=free;
reg_cx=bytes;
reg_dx=clusters;
} else {
reg_ax=0xffff;
Bit8u drive=reg_dl;
if (drive==0) drive=DOS_GetDefaultDrive();
else drive--;
if (drive<2) {
// floppy oddity, non-present drives don't fail with the
// invalid drive error
CALLBACK_SCF(true);
} else {
reg_ax=0xffff; // invalid drive specified
}
}
}
break;