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Added int 21 6c - Extended open

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1139
This commit is contained in:
Ulf Wohlers 2003-07-21 09:38:35 +00:00
parent e2f947a1c1
commit 5d93540ca0
3 changed files with 34 additions and 1 deletions
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1
include/dos_inc.h
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@ -97,6 +97,7 @@ bool DOS_GetFileDate(Bit16u entry, Bit16u* otime, Bit16u* odate);
/* Routines for Drive Class */
bool DOS_OpenFile(char * name,Bit8u flags,Bit16u * entry);
bool DOS_OpenFileExtended(char *name, Bit16u flags, Bit16u createAttr, Bit16u action, Bit16u *entry, Bit16u* status);
bool DOS_CreateFile(char * name,Bit16u attribute,Bit16u * entry);
bool DOS_UnlinkFile(char * name);
bool DOS_FindFirst(char *search,Bit16u attr);

8
src/dos/dos.cpp
View file

@ -833,7 +833,13 @@ static Bitu DOS_21Handler(void) {
break;
}
case 0x6c: /* Extended Open/Create */
E_Exit("Unhandled Dos 21 call %02X",reg_ah);
MEM_StrCopy(SegPhys(ds)+reg_si,name1,DOSNAMEBUF);
if (DOS_OpenFileExtended(name1,reg_bx,reg_cx,reg_dx,&reg_ax,&reg_cx)) {
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x71: /* Unknown probably 4dos detection */
reg_ax=0x7100;

26
src/dos/dos_files.cpp
View file

@ -370,6 +370,32 @@ bool DOS_OpenFile(char * name,Bit8u flags,Bit16u * entry) {
}
}
bool DOS_OpenFileExtended(char *name, Bit16u flags, Bit16u createAttr, Bit16u action, Bit16u *entry, Bit16u* status)
// FIXME: Not yet supported : Bit 13 of flags (int 0x24 on critical error
{
Bit16u result = 0;
if (DOS_OpenFile(name, flags, entry)) {
// File already exists
switch (action & 0x0f) {
case 0x00 : return false; // failed
case 0x01 : result = 1; break; // file open (already done)
case 0x02 : DOS_CloseFile(*entry); // replace
if (!DOS_CreateFile(name, flags, entry)) return false;
result = 3;
break;
default : E_Exit("DOS: OpenFileExtended: Unknown action.");
};
} else {
// File doesnt exist
if ((action & 0xf0)==0) return false;
// Create File
if (!DOS_CreateFile(name, flags, entry)) return false;
result = 2;
};
*status = result;
return true;
};
bool DOS_UnlinkFile(char * name) {
char fullname[DOS_PATHLENGTH];Bit8u drive;
if (!DOS_MakeName(name,fullname,&drive)) return false;