Bit8u DOS_FCBRandomRead(Bit16u seg,Bit16u offset,Bit16u numRec,bool restore) {
/* if restore is true :random read else random blok read.
* random read updates old block and old record to reflect the random data
* before the read!!!!!!!!! and the random data is not updated! (user must do this)
* Random block read updates these fields to reflect the state after the read!
*/
/* BUG: numRec should return the amount of records read!
* Not implemented yet as I'm unsure how to count on error states (partial/failed)
*/
DOS_FCB fcb(seg,offset);
Bit32u random;
Bit16u old_block=0;
Bit8u old_rec=0;
Bit8u error=0;
/* Set the correct record from the random data */
fcb.GetRandom(random);
fcb.SetRecord((Bit16u)(random / 128),(Bit8u)(random & 127));
if (restore) fcb.GetRecord(old_block,old_rec);//store this for after the read.
// Read records
for (int i=0; i<numRec; i++) {
error = DOS_FCBRead(seg,offset,(Bit16u)i);
if (error!=0x00) break;
}
Bit16u new_block;Bit8u new_rec;
fcb.GetRecord(new_block,new_rec);
if (restore) fcb.SetRecord(old_block,old_rec);
/* Update the random record pointer with new position only when restore is false*/
if(!restore) fcb.SetRandom(new_block*128+new_rec);
return error;
}
Bit8u DOS_FCBRandomRead(Bit16u seg,Bit16u offset,Bit16u * numRec,bool restore) {
/* if restore is true :random read else random blok read.
* random read updates old block and old record to reflect the random data
* before the read!!!!!!!!! and the random data is not updated! (user must do this)
* Random block read updates these fields to reflect the state after the read!
*/
DOS_FCB fcb(seg,offset);
Bit32u random;
Bit16u old_block=0;
Bit8u old_rec=0;
Bit8u error=0;
Bit16u count;
/* Set the correct record from the random data */
fcb.GetRandom(random);
fcb.SetRecord((Bit16u)(random / 128),(Bit8u)(random & 127));
if (restore) fcb.GetRecord(old_block,old_rec);//store this for after the read.
// Read records
for (count=0; count<*numRec; count++) {
error = DOS_FCBRead(seg,offset,count);
if (error!=FCB_SUCCESS) break;
}
if (error==FCB_READ_PARTIAL) count++; //partial read counts
*numRec=count;
Bit16u new_block;
Bit8u new_rec;
fcb.GetRecord(new_block,new_rec);
if (restore) fcb.SetRecord(old_block,old_rec);
/* Update the random record pointer with new position only when restore is false*/
if(!restore) fcb.SetRandom(new_block*128+new_rec);
return error;
}
static Bitu DOS_21Handler(void) {
if (((reg_ah != 0x50) && (reg_ah != 0x51) && (reg_ah != 0x62) && (reg_ah != 0x64)) && (reg_ah<0x6c)) {
DOS_PSP psp(dos.psp());
psp.SetStack(RealMake(SegValue(ss),reg_sp-18));
}
char name1[DOSNAMEBUF+2+DOS_NAMELENGTH_ASCII];
char name2[DOSNAMEBUF+2+DOS_NAMELENGTH_ASCII];
static Bitu time_start = 0; //For emulating temporary time changes.
switch (reg_ah) {
case 0x00: /* Terminate Program */
DOS_Terminate(mem_readw(SegPhys(ss)+reg_sp+2),false,0);
break;
case 0x01: /* Read character from STDIN, with echo */
{
Bit8u c;Bit16u n=1;
dos.echo=true;
DOS_ReadFile(STDIN,&c,&n);
reg_al=c;
dos.echo=false;
}
break;
case 0x02: /* Write character to STDOUT */
{
Bit8u c=reg_dl;Bit16u n=1;
DOS_WriteFile(STDOUT,&c,&n);
//Not in the official specs, but happens nonetheless. (last written character)
reg_al = c;// reg_al=(c==9)?0x20:c; //Officially: tab to spaces
}
break;
case 0x03: /* Read character from STDAUX */
{
Bit16u port = real_readw(0x40,0);
if(port!=0 && serialports[0]) {
Bit8u status;
// RTS/DTR on
IO_WriteB(port+4,0x3);
serialports[0]->Getchar(®_al, &status, true, 0xFFFFFFFF);
}
}
break;
case 0x04: /* Write Character to STDAUX */
{
Bit16u port = real_readw(0x40,0);
if(port!=0 && serialports[0]) {
// RTS/DTR on
IO_WriteB(port+4,0x3);
serialports[0]->Putchar(reg_dl,true,true, 0xFFFFFFFF);
// RTS off
IO_WriteB(port+4,0x1);
}
}
break;
case 0x05: /* Write Character to PRINTER */
E_Exit("DOS:Unhandled call %02X",reg_ah);
break;
case 0x06: /* Direct Console Output / Input */
switch (reg_dl) {
case 0xFF: /* Input */
{
//Simulate DOS overhead for timing sensitive games
//MM1
overhead();
//TODO Make this better according to standards
if (!DOS_GetSTDINStatus()) {
reg_al=0;
CALLBACK_SZF(true);
break;
}
Bit8u c;Bit16u n=1;
DOS_ReadFile(STDIN,&c,&n);
reg_al=c;
CALLBACK_SZF(false);
break;
}
default:
{
Bit8u c = reg_dl;Bit16u n = 1;
DOS_WriteFile(STDOUT,&c,&n);
reg_al = reg_dl;
}
break;
};
break;
case 0x07: /* Character Input, without echo */
{
Bit8u c;Bit16u n=1;
DOS_ReadFile (STDIN,&c,&n);
reg_al=c;
break;
};
case 0x08: /* Direct Character Input, without echo (checks for breaks officially :)*/
{
Bit8u c;Bit16u n=1;
DOS_ReadFile (STDIN,&c,&n);
reg_al=c;
break;
};
case 0x09: /* Write string to STDOUT */
{
Bit8u c;Bit16u n=1;
PhysPt buf=SegPhys(ds)+reg_dx;
while ((c=mem_readb(buf++))!='$') {
DOS_WriteFile(STDOUT,&c,&n);
}
}
break;
case 0x0a: /* Buffered Input */
{
//TODO ADD Break checkin in STDIN but can't care that much for it
PhysPt data=SegPhys(ds)+reg_dx;
Bit8u free=mem_readb(data);
Bit8u read=0;Bit8u c;Bit16u n=1;
if (!free) break;
free--;
for(;;) {
DOS_ReadFile(STDIN,&c,&n);
if (c == 8) { // Backspace
if (read) { //Something to backspace.
// STDOUT treats backspace as non-destructive.
DOS_WriteFile(STDOUT,&c,&n);
c = ' '; DOS_WriteFile(STDOUT,&c,&n);
c = 8; DOS_WriteFile(STDOUT,&c,&n);
--read;
}
continue;
}
if (read == free && c != 13) { // Keyboard buffer full
Bit8u bell = 7;
DOS_WriteFile(STDOUT, &bell, &n);
continue;
}
DOS_WriteFile(STDOUT,&c,&n);
mem_writeb(data+read+2,c);
if (c==13)
break;
read++;
};
mem_writeb(data+1,read);
break;
};
case 0x0b: /* Get STDIN Status */
if (!DOS_GetSTDINStatus()) {reg_al=0x00;}
else {reg_al=0xFF;}
//Simulate some overhead for timing issues
//Tankwar menu (needs maybe even more)
overhead();
break;
case 0x0c: /* Flush Buffer and read STDIN call */
{
/* flush buffer if STDIN is CON */
Bit8u handle=RealHandle(STDIN);
if (handle!=0xFF && Files[handle] && Files[handle]->IsName("CON")) {
Bit8u c;Bit16u n;
while (DOS_GetSTDINStatus()) {
n=1; DOS_ReadFile(STDIN,&c,&n);
}
}
switch (reg_al) {
case 0x1:
case 0x6:
case 0x7:
case 0x8:
case 0xa:
{
Bit8u oldah=reg_ah;
reg_ah=reg_al;
DOS_21Handler();
reg_ah=oldah;
}
break;
default:
// LOG_ERROR("DOS:0C:Illegal Flush STDIN Buffer call %d",reg_al);
reg_al=0;
break;
}
}
break;
//TODO Find out the values for when reg_al!=0
//TODO Hope this doesn't do anything special
case 0x0d: /* Disk Reset */
//Sure let's reset a virtual disk
break;
case 0x0e: /* Select Default Drive */
DOS_SetDefaultDrive(reg_dl);
reg_al=DOS_DRIVES;
break;
case 0x0f: /* Open File using FCB */
if(DOS_FCBOpen(SegValue(ds),reg_dx)){
reg_al=0;
}else{
reg_al=0xff;
}
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x0f FCB-fileopen used, result:al=%d",reg_al);
break;
case 0x10: /* Close File using FCB */
if(DOS_FCBClose(SegValue(ds),reg_dx)){
reg_al=0;
}else{
reg_al=0xff;
}
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x10 FCB-fileclose used, result:al=%d",reg_al);
break;
case 0x11: /* Find First Matching File using FCB */
if(DOS_FCBFindFirst(SegValue(ds),reg_dx)) reg_al = 0x00;
else reg_al = 0xFF;
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x11 FCB-FindFirst used, result:al=%d",reg_al);
break;
case 0x12: /* Find Next Matching File using FCB */
if(DOS_FCBFindNext(SegValue(ds),reg_dx)) reg_al = 0x00;
else reg_al = 0xFF;
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x12 FCB-FindNext used, result:al=%d",reg_al);
break;
case 0x13: /* Delete File using FCB */
if (DOS_FCBDeleteFile(SegValue(ds),reg_dx)) reg_al = 0x00;
else reg_al = 0xFF;
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x16 FCB-Delete used, result:al=%d",reg_al);
break;
case 0x14: /* Sequential read from FCB */
reg_al = DOS_FCBRead(SegValue(ds),reg_dx,0);
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x14 FCB-Read used, result:al=%d",reg_al);
break;
case 0x15: /* Sequential write to FCB */
reg_al=DOS_FCBWrite(SegValue(ds),reg_dx,0);
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x15 FCB-Write used, result:al=%d",reg_al);
break;
case 0x16: /* Create or truncate file using FCB */
if (DOS_FCBCreate(SegValue(ds),reg_dx)) reg_al = 0x00;
else reg_al = 0xFF;
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x16 FCB-Create used, result:al=%d",reg_al);
break;
case 0x17: /* Rename file using FCB */
if (DOS_FCBRenameFile(SegValue(ds),reg_dx)) reg_al = 0x00;
else reg_al = 0xFF;
break;
case 0x1b: /* Get allocation info for default drive */
if (!DOS_GetAllocationInfo(0,®_cx,®_al,®_dx)) reg_al=0xff;
break;
case 0x1c: /* Get allocation info for specific drive */
if (!DOS_GetAllocationInfo(reg_dl,®_cx,®_al,®_dx)) reg_al=0xff;
break;
case 0x21: /* Read random record from FCB */
{
Bit16u toread=1;
reg_al = DOS_FCBRandomRead(SegValue(ds),reg_dx,&toread,true);
}
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x21 FCB-Random read used, result:al=%d",reg_al);
break;
case 0x22: /* Write random record to FCB */
{
Bit16u towrite=1;
reg_al=DOS_FCBRandomWrite(SegValue(ds),reg_dx,&towrite,true);
}
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x22 FCB-Random write used, result:al=%d",reg_al);
break;
case 0x23: /* Get file size for FCB */
if (DOS_FCBGetFileSize(SegValue(ds),reg_dx)) reg_al = 0x00;
else reg_al = 0xFF;
break;
case 0x24: /* Set Random Record number for FCB */
DOS_FCBSetRandomRecord(SegValue(ds),reg_dx);
break;
case 0x27: /* Random block read from FCB */
reg_al = DOS_FCBRandomRead(SegValue(ds),reg_dx,®_cx,false);
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x27 FCB-Random(block) read used, result:al=%d",reg_al);
break;
case 0x28: /* Random Block write to FCB */
reg_al=DOS_FCBRandomWrite(SegValue(ds),reg_dx,®_cx,false);
LOG(LOG_FCB,LOG_NORMAL)("DOS:0x28 FCB-Random(block) write used, result:al=%d",reg_al);
break;
case 0x29: /* Parse filename into FCB */
{
Bit8u difference;
char string[1024];
MEM_StrCopy(SegPhys(ds)+reg_si,string,1023); // 1024 toasts the stack
reg_al=FCB_Parsename(SegValue(es),reg_di,reg_al ,string, &difference);
reg_si+=difference;
}
LOG(LOG_FCB,LOG_NORMAL)("DOS:29:FCB Parse Filename, result:al=%d",reg_al);
break;
case 0x19: /* Get current default drive */
reg_al=DOS_GetDefaultDrive();
break;
case 0x1a: /* Set Disk Transfer Area Address */
dos.dta(RealMakeSeg(ds,reg_dx));
break;
case 0x25: /* Set Interrupt Vector */
RealSetVec(reg_al,RealMakeSeg(ds,reg_dx));
break;
case 0x26: /* Create new PSP */
DOS_NewPSP(reg_dx,DOS_PSP(dos.psp()).GetSize());
reg_al=0xf0; /* al destroyed */
break;
case 0x2a: /* Get System Date */
{
reg_ax=0; // get time
CALLBACK_RunRealInt(0x1a);
if(reg_al) DOS_AddDays(reg_al);
int a = (14 - dos.date.month)/12;
int y = dos.date.year - a;
int m = dos.date.month + 12*a - 2;
reg_al=(dos.date.day+y+(y/4)-(y/100)+(y/400)+(31*m)/12) % 7;
reg_cx=dos.date.year;
reg_dh=dos.date.month;
reg_dl=dos.date.day;
}
break;
case 0x2b: /* Set System Date */
if (reg_cx<1980) { reg_al=0xff;break;}
if ((reg_dh>12) || (reg_dh==0)) { reg_al=0xff;break;}
if (reg_dl==0) { reg_al=0xff;break;}
if (reg_dl>DOS_DATE_months[reg_dh]) {
if(!((reg_dh==2)&&(reg_cx%4 == 0)&&(reg_dl==29))) // february pass
{ reg_al=0xff;break; }
}
dos.date.year=reg_cx;
dos.date.month=reg_dh;
dos.date.day=reg_dl;
reg_al=0;
break;
case 0x2c: { /* Get System Time */
reg_ax=0; // get time
CALLBACK_RunRealInt(0x1a);
if(reg_al) DOS_AddDays(reg_al);
reg_ah=0x2c;
Bitu ticks=((Bitu)reg_cx<<16)|reg_dx;
if(time_start<=ticks) ticks-=time_start;
Bitu time=(Bitu)((100.0/((double)PIT_TICK_RATE/65536.0)) * (double)ticks);
reg_dl=(Bit8u)((Bitu)time % 100); // 1/100 seconds
time/=100;
reg_dh=(Bit8u)((Bitu)time % 60); // seconds
time/=60;
reg_cl=(Bit8u)((Bitu)time % 60); // minutes
time/=60;
reg_ch=(Bit8u)((Bitu)time % 24); // hours
//Simulate DOS overhead for timing-sensitive games
//Robomaze 2
overhead();
break;
}
case 0x2d: /* Set System Time */
LOG(LOG_DOSMISC,LOG_ERROR)("DOS:Set System Time not supported");
//Check input parameters nonetheless
if( reg_ch > 23 || reg_cl > 59 || reg_dh > 59 || reg_dl > 99 )
reg_al = 0xff;
else { //Allow time to be set to zero. Restore the orginal time for all other parameters. (QuickBasic)
if (reg_cx == 0 && reg_dx == 0) {time_start = mem_readd(BIOS_TIMER);LOG_MSG("Warning: game messes with DOS time!");}
else time_start = 0;
reg_al = 0;
}
break;
case 0x2e: /* Set Verify flag */
dos.verify=(reg_al==1);
break;
case 0x2f: /* Get Disk Transfer Area */
SegSet16(es,RealSeg(dos.dta()));
reg_bx=RealOff(dos.dta());
break;
case 0x30: /* Get DOS Version */
if (reg_al==0) reg_bh=0xFF; /* Fake Microsoft DOS */
if (reg_al==1) reg_bh=0x10; /* DOS is in HMA */
reg_al=dos.version.major;
reg_ah=dos.version.minor;
/* Serialnumber */
reg_bl=0x00;
reg_cx=0x0000;
break;
case 0x31: /* Terminate and stay resident */
// Important: This service does not set the carry flag!
DOS_ResizeMemory(dos.psp(),®_dx);
DOS_Terminate(dos.psp(),true,reg_al);
break;
case 0x1f: /* Get drive parameter block for default drive */
case 0x32: /* Get drive parameter block for specific drive */
{ /* Officially a dpb should be returned as well. The disk detection part is implemented */
Bit8u drive=reg_dl;
if (!drive || reg_ah==0x1f) drive = DOS_GetDefaultDrive();
else drive--;
if (Drives[drive]) {
reg_al = 0x00;
SegSet16(ds,dos.tables.dpb);
reg_bx = drive;//Faking only the first entry (that is the driveletter)
LOG(LOG_DOSMISC,LOG_ERROR)("Get drive parameter block.");
} else {
reg_al=0xff;
}
}
break;
case 0x33: /* Extended Break Checking */
switch (reg_al) {
case 0:reg_dl=dos.breakcheck;break; /* Get the breakcheck flag */
case 1:dos.breakcheck=(reg_dl>0);break; /* Set the breakcheck flag */
case 2:{bool old=dos.breakcheck;dos.breakcheck=(reg_dl>0);reg_dl=old;}break;
case 3: /* Get cpsw */
/* Fallthrough */
case 4: /* Set cpsw */
LOG(LOG_DOSMISC,LOG_ERROR)("Someone playing with cpsw %x",reg_ax);
break;
case 5:reg_dl=3;break;//TODO should be z /* Always boot from c: :) */
case 6: /* Get true version number */
reg_bl=dos.version.major;
reg_bh=dos.version.minor;
reg_dl=dos.version.revision;
reg_dh=0x10; /* Dos in HMA */
break;
default:
LOG(LOG_DOSMISC,LOG_ERROR)("Weird 0x33 call %2X",reg_al);
reg_al =0xff;
break;
}
break;
case 0x34: /* Get INDos Flag */
SegSet16(es,DOS_SDA_SEG);
reg_bx=DOS_SDA_OFS + 0x01;
break;
case 0x35: /* Get interrupt vector */
reg_bx=real_readw(0,((Bit16u)reg_al)*4);
SegSet16(es,real_readw(0,((Bit16u)reg_al)*4+2));
break;
case 0x36: /* Get Free Disk Space */
{
Bit16u bytes,clusters,free;
Bit8u sectors;
if (DOS_GetFreeDiskSpace(reg_dl,&bytes,§ors,&clusters,&free)) {
reg_ax=sectors;
reg_bx=free;
reg_cx=bytes;
reg_dx=clusters;
} else {
Bit8u drive=reg_dl;
if (drive==0) drive=DOS_GetDefaultDrive();
else drive--;
if (drive<2) {
// floppy drive, non-present drivesdisks issue floppy check through int24
// (critical error handler); needed for Mixed up Mother Goose (hook)
// CALLBACK_RunRealInt(0x24);
}
reg_ax=0xffff; // invalid drive specified
}
}
break;
case 0x37: /* Get/Set Switch char Get/Set Availdev thing */
//TODO Give errors for these functions to see if anyone actually uses this shit-
switch (reg_al) {
case 0:
reg_al=0;reg_dl=0x2f;break; /* always return '/' like dos 5.0+ */
case 1:
reg_al=0;break;
case 2:
reg_al=0;reg_dl=0x2f;break;
case 3:
reg_al=0;break;
};
LOG(LOG_MISC,LOG_ERROR)("DOS:0x37:Call for not supported switchchar");
break;
case 0x38: /* Set Country Code */
if (reg_al==0) { /* Get country specidic information */
PhysPt dest = SegPhys(ds)+reg_dx;
MEM_BlockWrite(dest,dos.tables.country,0x18);
reg_ax = reg_bx = 0x01;
CALLBACK_SCF(false);
break;
} else { /* Set country code */
LOG(LOG_MISC,LOG_ERROR)("DOS:Setting country code not supported");
}
CALLBACK_SCF(true);
break;
case 0x39: /* MKDIR Create directory */
MEM_StrCopy(SegPhys(ds)+reg_dx,name1,DOSNAMEBUF);
if (DOS_MakeDir(name1)) {
reg_ax=0x05; /* ax destroyed */
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3a: /* RMDIR Remove directory */
MEM_StrCopy(SegPhys(ds)+reg_dx,name1,DOSNAMEBUF);
if (DOS_RemoveDir(name1)) {
reg_ax=0x05; /* ax destroyed */
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
LOG(LOG_MISC,LOG_NORMAL)("Remove dir failed on %s with error %X",name1,dos.errorcode);
}
break;
case 0x3b: /* CHDIR Set current directory */
MEM_StrCopy(SegPhys(ds)+reg_dx,name1,DOSNAMEBUF);
if (DOS_ChangeDir(name1)) {
reg_ax=0x00; /* ax destroyed */
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3c: /* CREATE Create of truncate file */
MEM_StrCopy(SegPhys(ds)+reg_dx,name1,DOSNAMEBUF);
if (DOS_CreateFile(name1,reg_cx,®_ax)) {
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3d: /* OPEN Open existing file */
MEM_StrCopy(SegPhys(ds)+reg_dx,name1,DOSNAMEBUF);
if (DOS_OpenFile(name1,reg_al,®_ax)) {
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3e: /* CLOSE Close file */
if (DOS_CloseFile(reg_bx)) {
// reg_al=0x01; /* al destroyed. Refcount */
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3f: /* READ Read from file or device */
{
Bit16u toread=reg_cx;
dos.echo=true;
if (DOS_ReadFile(reg_bx,dos_copybuf,&toread)) {
MEM_BlockWrite(SegPhys(ds)+reg_dx,dos_copybuf,toread);
reg_ax=toread;
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
modify_cycles(reg_ax);
dos.echo=false;
break;
}
case 0x40: /* WRITE Write to file or device */
{
Bit16u towrite=reg_cx;
MEM_BlockRead(SegPhys(ds)+reg_dx,dos_copybuf,towrite);
if (DOS_WriteFile(reg_bx,dos_copybuf,&towrite)) {
reg_ax=towrite;
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
modify_cycles(reg_ax);
break;
};
case 0x41: /* UNLINK Delete file */
MEM_StrCopy(SegPhys(ds)+reg_dx,name1,DOSNAMEBUF);
if (DOS_UnlinkFile(name1)) {
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x42: /* LSEEK Set current file position */
{
Bit32u pos=(reg_cx<<16) + reg_dx;
if (DOS_SeekFile(reg_bx,&pos,reg_al)) {
reg_dx=(Bit16u)(pos >> 16);
reg_ax=(Bit16u)(pos & 0xFFFF);
CALLBACK_SCF(false);
} else {
reg_ax=dos.errorcode;
CALLBACK_SCF(true);
}
break;
}
static Bitu DOS_21Handler(void)
{
if (((reg_ah != 0x50) && (reg_ah != 0x51) && (reg_ah != 0x62) && (reg_ah != 0x64)) && (reg_ah < 0x6c))
if (dos.psp() != 0) // No program loaded yet?
{
DOS_PSP psp(dos.psp());
psp.SetStack(SegOff2dWord(SegValue(ss), reg_sp-18));
psp.FindFreeFileEntry();
}
char name1[DOSNAMEBUF+2+DOS_NAMELENGTH_ASCII];
char name2[DOSNAMEBUF+2+DOS_NAMELENGTH_ASCII];
switch (reg_ah)
{
case 0x00: // Terminate Program
DOS_Terminate(Mem_Lodsw(SegPhys(ss)+reg_sp+2), false, 0);
break;
case 0x01: // Read character from STDIN, with echo
{
Bit8u c;
Bit16u n = 1;
dos.echo = true;
DOS_ReadFile(STDIN, &c, &n);
reg_al = c;
dos.echo = false;
}
break;
case 0x02: // Write character to STDOUT
{
Bit8u c = reg_dl;
Bit16u n = 1;
DOS_WriteFile(STDOUT, &c, &n);
// Not in the official specs, but happens nonetheless. (last written character)
reg_al = c; // reg_al=(c==9)?0x20:c; //Officially: tab to spaces
}
break;
case 0x03: // Read character from STDAUX
{
Bit16u port = Mem_Lodsw(0x40, 0);
if (port != 0 && serialPorts[0])
serialPorts[0]->Getchar(®_al);
}
break;
case 0x04: // Write Character to STDAUX
{
Bit16u port = Mem_Lodsw(0x40, 0);
if (port != 0 && serialPorts[0])
serialPorts[0]->Putchar(reg_dl);
}
break;
case 0x05: // Write Character to PRINTER
parallelPorts[0]->Putchar(reg_dl);
break;
case 0x06: // Direct Console Output/Input
if (reg_dl == 0xff) // Input
{
// TODO Make this better according to standards
if (!DOS_GetSTDINStatus())
{
reg_al = 0;
CALLBACK_SZF(true);
break;
}
Bit8u c;
Bit16u n = 1;
DOS_ReadFile(STDIN, &c, &n);
reg_al = c;
CALLBACK_SZF(false);
}
else // Ouput
{
Bit8u c = reg_dl;
Bit16u n = 1;
DOS_WriteFile(STDOUT, &c, &n);
reg_al = reg_dl;
}
break;
case 0x07: // Character Input, without echo
case 0x08: // Direct Character Input, without echo (checks for breaks officially :)
{
Bit8u c;
Bit16u n = 1;
DOS_ReadFile (STDIN, &c, &n);
reg_al = c;
}
break;
case 0x09: // Write string to STDOUT
{
Bit8u c;
Bit16u n = 1;
PhysPt buf = SegPhys(ds)+reg_dx;
while ((c = Mem_Lodsb(buf++)) != '$')
DOS_WriteFile(STDOUT, &c, &n);
}
break;
case 0x0a: // Buffered Input
{
// TODO ADD Break checkin in STDIN but can't care that much for it
PhysPt data = SegPhys(ds)+reg_dx;
Bit8u free = Mem_Lodsb(data);
if (!free)
break;
Bit8u read = 0;
Bit8u c;
Bit16u n = 1;
for(;;)
{
DOS_ReadFile(STDIN, &c ,&n);
if (c == 8)
{ // Backspace
if (read)
{ // Something to backspace.
DOS_WriteFile(STDOUT, &c, &n); // STDOUT treats backspace as non-destructive.
c = ' ';
DOS_WriteFile(STDOUT, &c, &n);
c = 8;
DOS_WriteFile(STDOUT, &c, &n);
--read;
}
continue;
}
if (read >= free) // Keyboard buffer full
{
Beep(1750, 300);
continue;
}
DOS_WriteFile(STDOUT, &c, &n);
Mem_Stosb(data+read+2, c);
if (c == 13)
break;
read++;
}
Mem_Stosb(data+1, read);
}
break;
case 0x0b: // Get STDIN Status
reg_al = DOS_GetSTDINStatus() ? 0xff : 0x00;
break;
case 0x0c: // Flush Buffer and read STDIN call
{
Bit8u handle = RealHandle(STDIN);
if (handle != 0xFF && Files[handle] && Files[handle]->IsName("CON")) // flush buffer if STDIN is CON
{
Bit8u c;
Bit16u n;
while (DOS_GetSTDINStatus())
{
n = 1;
DOS_ReadFile(STDIN, &c, &n);
}
}
if (reg_al == 0x1 || reg_al == 0x6 || reg_al == 0x7 || reg_al == 0x8 || reg_al == 0xa)
{
Bit8u oldah = reg_ah;
reg_ah = reg_al;
DOS_21Handler();
reg_ah = oldah;
}
else
reg_al = 0;
}
break;
case 0x0d: // Disk Reset
break;
case 0x0e: // Select Default Drive
DOS_SetDefaultDrive(reg_dl);
reg_al = DOS_DRIVES;
break;
case 0x0f: // Open File using FCB
reg_al = DOS_FCBOpen(SegValue(ds), reg_dx) ? 0 : 0xFF;
break;
case 0x10: // Close File using FCB
reg_al = DOS_FCBClose(SegValue(ds), reg_dx) ? 0 : 0xFF;
break;
case 0x11: // Find First Matching File using FCB
reg_al = DOS_FCBFindFirst(SegValue(ds), reg_dx) ? 0 : 0xFF; // No test for C:\COMMAND.COM!
break;
case 0x12: // Find Next Matching File using FCB
reg_al = DOS_FCBFindNext(SegValue(ds), reg_dx) ? 0 : 0xFF;
break;
case 0x13: // Delete File using FCB
reg_al = DOS_FCBDeleteFile(SegValue(ds), reg_dx) ? 0 : 0xFF;
break;
case 0x14: // Sequential read from FCB
reg_al = DOS_FCBRead(SegValue(ds), reg_dx, 0);
break;
case 0x15: // Sequential write to FCB
reg_al = DOS_FCBWrite(SegValue(ds), reg_dx, 0);
break;
case 0x16: // Create or truncate file using FCB
reg_al = DOS_FCBCreate(SegValue(ds), reg_dx) ? 0 : 0xFF;
break;
case 0x17: // Rename file using FCB
reg_al = DOS_FCBRenameFile(SegValue(ds), reg_dx) ? 0 : 0xFF;
break;
case 0x1b: // Get allocation info for default drive
if (!DOS_GetAllocationInfo(0, ®_cx, ®_al, ®_dx))
reg_al = 0xFF;
break;
case 0x1c: // Get allocation info for specific drive
if (!DOS_GetAllocationInfo(reg_dl, ®_cx, ®_al, ®_dx))
reg_al = 0xFF;
break;
case 0x21: // Read random record from FCB
reg_al = DOS_FCBRandomRead(SegValue(ds), reg_dx, 1, true);
break;
case 0x22: // Write random record to FCB
reg_al = DOS_FCBRandomWrite(SegValue(ds), reg_dx, 1, true);
break;
case 0x23: // Get file size for FCB
reg_al = DOS_FCBGetFileSize(SegValue(ds), reg_dx) ? 0 : 0xFF;
break;
case 0x24: // Set Random Record number for FCB
DOS_FCBSetRandomRecord(SegValue(ds), reg_dx);
break;
case 0x27: // Random block read from FCB
reg_al = DOS_FCBRandomRead(SegValue(ds), reg_dx, reg_cx, false);
break;
case 0x28: // Random Block write to FCB
reg_al = DOS_FCBRandomWrite(SegValue(ds), reg_dx, reg_cx, false);
break;
case 0x29: // Parse filename into FCB
{
Bit8u difference;
char string[1024];
Mem_StrnCopyFrom(string, SegPhys(ds)+reg_si, 1023); // 1024 toasts the stack
reg_al = FCB_Parsename(SegValue(es), reg_di, reg_al, string, &difference);
reg_si += difference;
}
break;
case 0x19: // Get current default drive
reg_al = DOS_GetDefaultDrive();
break;
case 0x1a: // Set Disk Transfer Area Address
dos.dta(RealMakeSeg(ds, reg_dx));
break;
case 0x25: // Set Interrupt Vector
RealSetVec(reg_al, RealMakeSeg(ds, reg_dx));
break;
case 0x26: // Create new PSP
DOS_NewPSP(reg_dx, DOS_PSP(dos.psp()).GetSize());
break;
case 0x2a: // Get System Date
{
_SYSTEMTIME systime; // Return the Windows localdate
GetLocalTime(&systime);
reg_al = (Bit8u)systime.wDayOfWeek; // NB Sunday = 0, despite of MSDN documentation
reg_cx = systime.wYear;
reg_dx = (systime.wMonth<<8)+systime.wDay;
}
break;
case 0x2b: // Set System Date (we don't!)
reg_al = 0xff;
daysInMonth[2] = reg_cx&3 ? 28 : 29; // Year is from 1980 to 2099, it is this simple
if (reg_cx >= 1980 && reg_cx <= 2099)
if (reg_dh > 0 && reg_dh <= 12)
if (reg_dl > 0 && reg_dl <= daysInMonth[reg_dh])
reg_al = 0; // Date is valid, fake set
break;
case 0x2c: // Get System Time
{
_SYSTEMTIME systime; // Return the Windows localtime
GetLocalTime(&systime);
reg_cx = (systime.wHour<<8) + systime.wMinute;
reg_dx = (systime.wSecond<<8) + systime.wMilliseconds/10;
}
break;
case 0x2d: // Set System Time (we don't!)
if (reg_ch < 24 && reg_cl < 60 && reg_dh < 60 && reg_dl < 100)
reg_al = 0; // Time is valid, fake set
else
reg_al = 0xff;
break;
case 0x2e: // Set Verify flag
dos.verify = (reg_al == 1);
break;
case 0x2f: // Get Disk Transfer Area
SegSet16(es, RealSeg(dos.dta()));
reg_bx = RealOff(dos.dta());
break;
case 0x30: // Get DOS Version
if (reg_al == 0)
reg_bh = 0xFF; // Fake Microsoft DOS
else if (reg_al == 1)
reg_bh = 0; // DOS is NOT in HMA
reg_al = dos.version.major;
reg_ah = dos.version.minor;
reg_bl = 0; // Serialnumber
reg_cx = 0;
break;
case 0x31: // Terminate and stay resident
// Important: This service does not set the carry flag!
DOS_ResizeMemory(dos.psp(), ®_dx);
DOS_Terminate(dos.psp(), true, reg_al);
break;
case 0x1f: // Get drive parameter block for default drive
case 0x32: // Get drive parameter block for specific drive
{ // Officially a dpb should be returned as well. The disk detection part is implemented
Bit8u drive = reg_dl;
if (!drive || reg_ah == 0x1f)
drive = DOS_GetDefaultDrive();
else
drive--;
if (Drives[drive])
{
reg_al = 0;
SegSet16(ds, dos.tables.dpb);
reg_bx = drive; // Faking only the first entry (that is the driveletter)
}
else
reg_al = 0xff;
}
break;
case 0x33: // Extended Break Checking
switch (reg_al)
{
case 0: // Get the breakcheck flag
reg_dl = dos.breakcheck;
break;
case 1: // Set the breakcheck flag
dos.breakcheck = (reg_dl > 0);
break;
case 2:
{
bool old = dos.breakcheck;
dos.breakcheck = (reg_dl > 0);
reg_dl = old;
}
break;
case 3: // Get cpsw
case 4: // Set cpsw, both not used really
break;
case 5:
reg_dl = 3; // Boot drive = C:
break;
case 6: // Get true version number
reg_bx = (dos.version.minor<<8) + dos.version.major;
reg_dx = 0x1000; // Dos in ROM
break;
default:
reg_al = 0xff;
}
break;
case 0x34: // Get address of INDos Flag
SegSet16(es, DOS_SDA_SEG);
reg_bx = DOS_SDA_OFS + 0x01;
break;
case 0x35: // Get interrupt vector
reg_bx = Mem_Lodsw(0, ((Bit16u)reg_al)*4);
SegSet16(es, Mem_Lodsw(0, ((Bit16u)reg_al)*4+2));
break;
case 0x36: // Get Free Disk Space
{
Bit16u bytes, clusters, free;
Bit8u sectors;
if (DOS_GetFreeDiskSpace(reg_dl, &bytes, §ors, &clusters, &free))
{
reg_ax = sectors;
reg_bx = free;
reg_cx = bytes;
reg_dx = clusters;
}
else
reg_ax = 0xffff; // invalid drive specified
}
break;
case 0x37: // Get/Set Switch char Get/Set Availdev thing
switch (reg_al)
{
case 0:
reg_dl = 0x2f; // Always return '/' like dos 5.0+
break;
case 1:
reg_al = 0;
break;
case 2:
reg_al = 0;
reg_dl = 0x2f;
break;
case 3:
reg_al = 0;
break;
}
break;
case 0x38: // Get/set Country Code
if (reg_al == 0) // Get country specidic information
{
PhysPt dest = SegPhys(ds)+reg_dx;
Mem_CopyTo(dest, dos.tables.country, 0x18);
reg_ax = reg_bx = 1;
CALLBACK_SCF(false);
}
else // Set country code
CALLBACK_SCF(true);
break;
case 0x39: // MKDIR Create directory
Mem_StrnCopyFrom(name1, SegPhys(ds)+reg_dx, DOSNAMEBUF);
rSpTrim(name1);
if (DOS_MakeDir(name1))
{
reg_ax = 0xffff; // AX destroyed
CALLBACK_SCF(false);
}
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3a: // RMDIR Remove directory
Mem_StrnCopyFrom(name1, SegPhys(ds)+reg_dx, DOSNAMEBUF);
rSpTrim(name1);
if (DOS_RemoveDir(name1))
{
reg_ax = 0xffff; // AX destroyed
CALLBACK_SCF(false);
}
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3b: // CHDIR Set current directory
Mem_StrnCopyFrom(name1, SegPhys(ds)+reg_dx, DOSNAMEBUF);
rSpTrim(name1);
if (DOS_ChangeDir(name1))
{
reg_ax = 0xff00; // AX destroyed
CALLBACK_SCF(false);
}
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3c: // CREATE Create or truncate file
Mem_StrnCopyFrom(name1, SegPhys(ds)+reg_dx, DOSNAMEBUF);
rSpTrim(name1);
if (DOS_CreateFile(name1, reg_cx, ®_ax))
CALLBACK_SCF(false);
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3d: // OPEN Open existing file
{
Mem_StrnCopyFrom(name1, SegPhys(ds)+reg_dx, DOSNAMEBUF);
rSpTrim(name1);
if (DOS_OpenFile(name1, reg_al, ®_ax))
CALLBACK_SCF(false);
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
break;
}
case 0x3e: // CLOSE Close file
if (DOS_CloseFile(reg_bx))
CALLBACK_SCF(false);
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x3f: // READ Read from file or device
{
Bit16u toread = reg_cx;
dos.echo = true;
if (DOS_ReadFile(reg_bx, dos_copybuf, &toread))
{
Mem_CopyTo(SegPhys(ds)+reg_dx, dos_copybuf, toread);
reg_ax = toread;
CALLBACK_SCF(false);
}
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
dos.echo = false;
}
break;
case 0x40: // WRITE Write to file or device
{
Bit16u towrite = reg_cx;
Mem_CopyFrom(SegPhys(ds)+reg_dx, dos_copybuf, towrite);
if (DOS_WriteFile(reg_bx, dos_copybuf, &towrite))
{
reg_ax = towrite;
CALLBACK_SCF(false);
}
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
}
break;
case 0x41: // UNLINK Delete file
Mem_StrnCopyFrom(name1, SegPhys(ds)+reg_dx, DOSNAMEBUF);
rSpTrim(name1);
if (DOS_UnlinkFile(name1))
CALLBACK_SCF(false);
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
break;
case 0x42: // LSEEK Set current file position
{
Bit32u pos = (reg_cx<<16) + reg_dx;
if (DOS_SeekFile(reg_bx, &pos, reg_al))
{
reg_dx = (Bit16u)(pos >> 16);
reg_ax = (Bit16u)(pos & 0xFFFF);
CALLBACK_SCF(false);
}
else
{
reg_ax = dos.errorcode;
CALLBACK_SCF(true);
}
}