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Allocate memory changes handle only on succes.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2096
This commit is contained in:
Peter Veenstra 2005-01-12 12:44:48 +00:00
parent 158562ba52
commit 37084d6084
1 changed files with 11 additions and 9 deletions
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20
src/ints/ems.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: ems.cpp,v 1.36 2004-10-23 15:15:06 qbix79 Exp $ */
/* $Id: ems.cpp,v 1.37 2005-01-12 12:44:48 qbix79 Exp $ */
#include <string.h>
#include <stdlib.h>
@ -119,20 +119,22 @@ static bool INLINE ValidHandle(Bit16u handle) {
return true;
}
static Bit8u EMM_AllocateMemory(Bit16u pages,Bit16u & handle) {
static Bit8u EMM_AllocateMemory(Bit16u pages,Bit16u & dhandle) {
/* Check for 0 page allocation */
if (!pages) return EMM_ZERO_PAGES;
/* Check for enough free pages */
if ((MEM_FreeTotal()/4)<pages) { handle=NULL_HANDLE; return EMM_OUT_OF_LOG;}
handle=1;
if ((MEM_FreeTotal()/ 4) < pages) { return EMM_OUT_OF_LOG;}
Bit16u handle = 1;
/* Check for a free handle */
while (emm_handles[handle].pages!=NULL_HANDLE) {
if (++handle>=EMM_MAX_HANDLES) {handle=NULL_HANDLE;return EMM_OUT_OF_HANDLES;}
while (emm_handles[handle].pages != NULL_HANDLE) {
if (++handle >= EMM_MAX_HANDLES) {return EMM_OUT_OF_HANDLES;}
}
MemHandle mem=MEM_AllocatePages(pages*4,false);
MemHandle mem = MEM_AllocatePages(pages*4,false);
if (!mem) E_Exit("EMS:Memory allocation failure");
emm_handles[handle].pages=pages;
emm_handles[handle].mem=mem;
emm_handles[handle].pages = pages;
emm_handles[handle].mem = mem;
/* Change handle only if there is no error. */
dhandle = handle;
return EMM_NO_ERROR;
}