Bit8u DOS_FCBRandomWrite(Bit16u seg,Bit16u offset,Bit16u * numRec,bool restore) {
/* see FCB_RandomRead */
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);
if (*numRec > 0) {
/* Write records */
for (count=0; count<*numRec; count++) {
error = DOS_FCBWrite(seg,offset,count);// dos_fcbwrite return 0 false when true...
if (error!=FCB_SUCCESS) break;
}
*numRec=count;
} else {
DOS_FCBIncreaseSize(seg,offset);
}
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_FCBRandomWrite(Bit16u seg, Bit16u offset, Bit16u numRec, bool restore) // See FCB_RandomRead
{
DOS_FCB fcb(seg,offset);
Bit32u random;
Bit16u old_block = 0;
Bit8u old_rec = 0;
Bit8u error = 0;
fcb.GetRandom(random); // Set the correct record from the random data
fcb.SetRecord((Bit16u)(random / 128), (Bit8u)(random & 127));
if (restore)
fcb.GetRecord(old_block, old_rec);
if (numRec > 0)
for (int i = 0; i < numRec; i++) // Write records
{
error = DOS_FCBWrite(seg, offset, (Bit16u)i); // DOS_fcbwrite return 0 false when true...
if (error != 0)
break;
}
else
DOS_FCBIncreaseSize(seg, offset);
Bit16u new_block;
Bit8u new_rec;
fcb.GetRecord(new_block, new_rec);
if (restore)
fcb.SetRecord(old_block, old_rec);
else
fcb.SetRandom(new_block*128+new_rec); // Update the random record pointer with new position only when restore is false
return error;
}
