$OpenBSD$

shitty shitty shitty shitty shitty shitty.  anyone with experience
writing this probably would want to write an entirely new malloc for
openbsd-zdoom as i have a feeling every example in the existing
code (and my shitty attempts to reuse the sun stuff) would make someone
vomit.

i believe this is what is causing the bulk of the crashes, such as on exit,
etc.  typically its a memory allocation wasn't where i thought it was type
error on sigsegv.

--- src/m_alloc.cpp.orig	Fri Dec 28 21:11:30 2012
+++ src/m_alloc.cpp	Fri Dec 28 21:37:21 2012
@@ -38,6 +38,9 @@
 #elif defined(__APPLE__)
 #include <stdlib.h>
 #include <malloc/malloc.h>
+#elif defined(__OpenBSD__)
+#include <stdlib.h>
+#include <stdio.h>
 #else
 #include <malloc.h>
 #endif
@@ -52,42 +55,17 @@
 #endif
 #if defined(__APPLE__)
 #define _msize(p)				malloc_size(p)
-#elif defined(__sun)
+#elif defined(__sun)
 #define _msize(p)				(*((size_t*)(p)-1))
+#elif defined(__OpenBSD__)
+#define _msize(p)				(*((size_t*)(p)-1))
 #elif !defined(_WIN32)
 #define _msize(p)				malloc_usable_size(p)	// from glibc/FreeBSD
 #endif
 
 #ifndef _DEBUG
-#if !defined(__sun)
 void *M_Malloc(size_t size)
 {
-	void *block = malloc(size);
-
-	if (block == NULL)
-		I_FatalError("Could not malloc %zu bytes", size);
-
-	GC::AllocBytes += _msize(block);
-	return block;
-}
-
-void *M_Realloc(void *memblock, size_t size)
-{
-	if (memblock != NULL)
-	{
-		GC::AllocBytes -= _msize(memblock);
-	}
-	void *block = realloc(memblock, size);
-	if (block == NULL)
-	{
-		I_FatalError("Could not realloc %zu bytes", size);
-	}
-	GC::AllocBytes += _msize(block);
-	return block;
-}
-#else
-void *M_Malloc(size_t size)
-{
 	void *block = malloc(size+sizeof(size_t));
 
 	if (block == NULL)
@@ -123,41 +101,13 @@ void *M_Realloc(void *memblock, size_t size)
 	GC::AllocBytes += _msize(block);
 	return block;
 }
-#endif
 #else
 #ifdef _MSC_VER
 #include <crtdbg.h>
 #endif
 
-#if !defined(__sun)
 void *M_Malloc_Dbg(size_t size, const char *file, int lineno)
 {
-	void *block = _malloc_dbg(size, _NORMAL_BLOCK, file, lineno);
-
-	if (block == NULL)
-		I_FatalError("Could not malloc %zu bytes", size);
-
-	GC::AllocBytes += _msize(block);
-	return block;
-}
-
-void *M_Realloc_Dbg(void *memblock, size_t size, const char *file, int lineno)
-{
-	if (memblock != NULL)
-	{
-		GC::AllocBytes -= _msize(memblock);
-	}
-	void *block = _realloc_dbg(memblock, size, _NORMAL_BLOCK, file, lineno);
-	if (block == NULL)
-	{
-		I_FatalError("Could not realloc %zu bytes", size);
-	}
-	GC::AllocBytes += _msize(block);
-	return block;
-}
-#else
-void *M_Malloc_Dbg(size_t size, const char *file, int lineno)
-{
 	void *block = _malloc_dbg(size+sizeof(size_t), _NORMAL_BLOCK, file, lineno);
 
 	if (block == NULL)
@@ -195,25 +145,16 @@ void *M_Realloc_Dbg(void *memblock, size_t size, const
 	return block;
 }
 #endif
-#endif
 
-#if !defined(__sun)
 void M_Free (void *block)
 {
-	if (block != NULL)
-	{
-		GC::AllocBytes -= _msize(block);
-		free(block);
-	}
-}
-#else
-void M_Free (void *block)
-{
 	if(block != NULL)
 	{
 		GC::AllocBytes -= _msize(block);
+#if defined(__OpenBSD__)
+		free(((size_t*) block)-1);
+#else
 		free(((size_t*) block)-1);
+#endif
 	}
 }
-#endif
-