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fix fcb write function with odd behaviour for zero-block writing

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3327
This commit is contained in:
Sebastian Strohhäcker 2009-03-23 21:58:05 +00:00
parent d8266a6a41
commit cb09b0a3ac
1 changed files with 38 additions and 7 deletions
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45
src/dos/dos_files.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: dos_files.cpp,v 1.106 2009-03-14 16:10:00 c2woody Exp $ */
/* $Id: dos_files.cpp,v 1.107 2009-03-23 21:58:05 c2woody Exp $ */
#include <string.h>
#include <stdlib.h>
@ -961,8 +961,7 @@ Bit8u DOS_FCBRead(Bit16u seg,Bit16u offset,Bit16u recno) {
return FCB_READ_PARTIAL;
}
Bit8u DOS_FCBWrite(Bit16u seg,Bit16u offset,Bit16u recno)
{
Bit8u DOS_FCBWrite(Bit16u seg,Bit16u offset,Bit16u recno) {
DOS_FCB fcb(seg,offset);
Bit8u fhandle,cur_rec;Bit16u cur_block,rec_size;
fcb.GetSeqData(fhandle,rec_size);
@ -992,6 +991,34 @@ Bit8u DOS_FCBWrite(Bit16u seg,Bit16u offset,Bit16u recno)
return FCB_SUCCESS;
}
Bit8u DOS_FCBIncreaseSize(Bit16u seg,Bit16u offset) {
DOS_FCB fcb(seg,offset);
Bit8u fhandle,cur_rec;Bit16u cur_block,rec_size;
fcb.GetSeqData(fhandle,rec_size);
fcb.GetRecord(cur_block,cur_rec);
Bit32u pos=((cur_block*128)+cur_rec)*rec_size;
if (!DOS_SeekFile(fhandle,&pos,DOS_SEEK_SET)) return FCB_ERR_WRITE;
Bit16u towrite=0;
if (!DOS_WriteFile(fhandle,dos_copybuf,&towrite)) return FCB_ERR_WRITE;
Bit32u size;Bit16u date,time;
fcb.GetSizeDateTime(size,date,time);
if (pos+towrite>size) size=pos+towrite;
//time doesn't keep track of endofday
date = DOS_PackDate(dos.date.year,dos.date.month,dos.date.day);
Bit32u ticks = mem_readd(BIOS_TIMER);
Bit32u seconds = (ticks*10)/182;
Bit16u hour = (Bit16u)(seconds/3600);
Bit16u min = (Bit16u)((seconds % 3600)/60);
Bit16u sec = (Bit16u)(seconds % 60);
time = DOS_PackTime(hour,min,sec);
Bit8u temp=RealHandle(fhandle);
Files[temp]->time=time;
Files[temp]->date=date;
fcb.SetSizeDateTime(size,date,time);
fcb.SetRecord(cur_block,cur_rec);
return FCB_SUCCESS;
}
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
@ -1034,10 +1061,14 @@ Bit8u DOS_FCBRandomWrite(Bit16u seg,Bit16u offset,Bit16u numRec,bool restore) {
fcb.GetRandom(random);
fcb.SetRecord((Bit16u)(random / 128),(Bit8u)(random & 127));
if (restore) fcb.GetRecord(old_block,old_rec);
/* Write records */
for (int i=0; i<numRec; i++) {
error = DOS_FCBWrite(seg,offset,(Bit16u)i);// dos_fcbwrite return 0 false when true...
if (error!=0x00) break;
if (numRec>0) {
/* Write records */
for (int i=0; i<numRec; i++) {
error = DOS_FCBWrite(seg,offset,(Bit16u)i);// dos_fcbwrite return 0 false when true...
if (error!=0x00) break;
}
} else {
DOS_FCBIncreaseSize(seg,offset);
}
Bit16u new_block;Bit8u new_rec;
fcb.GetRecord(new_block,new_rec);