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resize MCB to maximum if requested size is too big (DSPlay)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2347
This commit is contained in:
Sebastian Strohhäcker 2005-10-13 16:24:42 +00:00
parent bb792e21a1
commit 267d3c2539
1 changed files with 14 additions and 8 deletions
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22
src/dos/dos_memory.cpp
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@ -191,6 +191,7 @@ bool DOS_ResizeMemory(Bit16u segment,Bit16u * blocks) {
mcb.SetPSPSeg(dos.psp());
return true;
}
/* MCB will grow, try to join with following MCB */
if (mcb.GetType()!=0x5a) {
if (mcb_next.GetPSPSeg()==MCB_FREE) {
total+=mcb_next.GetSize()+1;
@ -198,6 +199,7 @@ bool DOS_ResizeMemory(Bit16u segment,Bit16u * blocks) {
}
if (*blocks<total) {
if (mcb.GetType()!=0x5a) {
/* save type of following MCB */
mcb.SetType(mcb_next.GetType());
}
mcb.SetSize(*blocks);
@ -209,15 +211,19 @@ bool DOS_ResizeMemory(Bit16u segment,Bit16u * blocks) {
mcb.SetPSPSeg(dos.psp());
return true;
}
if (*blocks==total) {
if (mcb.GetType()!=0x5a) {
mcb.SetType(mcb_next.GetType());
}
mcb.SetSize(*blocks);
mcb.SetPSPSeg(dos.psp());
return true;
/* at this point: *blocks==total (fits) or *blocks>total,
in the second case resize block to maximum */
if (mcb.GetType()!=0x5a) {
/* adjust type of joined MCB */
mcb.SetType(mcb_next.GetType());
}
*blocks=total;
mcb.SetSize(total);
mcb.SetPSPSeg(dos.psp());
if (*blocks==total) return true; /* block fit exactly */
*blocks=total; /* return maximum */
DOS_SetError(DOSERR_INSUFFICIENT_MEMORY);
return false;
}