1 files changed, 112 insertions, 0 deletions
diff --git a/private/crt32/heap/msize.c b/private/crt32/heap/msize.c
new file mode 100644
index 000000000..103f2af9d
--- /dev/null
+++ b/private/crt32/heap/msize.c
@@ -0,0 +1,112 @@
+/***
+*msize.c - calculate the size of a memory block in the heap
+*
+*	Copyright (c) 1989-1991, Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*	Defines the following function:
+*		_msize()	- calculate the size of a block in the heap
+*
+*Revision History:
+*	07-18-89   GJF	Module created
+*	11-13-89   GJF	Added MTHREAD support. Also fixed copyright and got
+*			rid of DEBUG286 stuff.
+*	12-18-89   GJF	Changed name of header file to heap.h, also added
+*			explicit _cdecl to function definitions.
+*	03-11-90   GJF	Replaced _cdecl with _CALLTYPE1 and added #include
+*			<cruntime.h>
+*	07-30-90   SBM	Added return statement to MTHREAD _msize function
+*	09-28-90   GJF	New-style function declarators.
+*	04-08-91   GJF	Temporary hack for Win32/DOS folks - special version
+*			of _msize that calls HeapSize. Change conditioned on
+*			_WIN32DOS_.
+*
+*******************************************************************************/
+
+#ifndef _WIN32DOS_
+
+#include <cruntime.h>
+#include <heap.h>
+#include <malloc.h>
+#include <os2dll.h>
+#include <stdlib.h>
+
+/***
+*size_t _msize(pblck) - calculate the size of specified block in the heap
+*
+*Purpose:
+*	Calculates the size of memory block (in the heap) pointed to by
+*	pblck.
+*
+*Entry:
+*	void *pblck - pointer to a memory block in the heap
+*
+*Return:
+*	size of the block
+*
+*******************************************************************************/
+
+#ifdef	MTHREAD
+
+size_t _CALLTYPE1 _msize (
+	void *pblck
+	)
+{
+	size_t	retval;
+
+	/* lock the heap
+	 */
+	_mlock(_HEAP_LOCK);
+
+	retval = _msize_lk(pblck);
+
+	/* release the heap lock
+	 */
+	_munlock(_HEAP_LOCK);
+
+	return retval;
+}
+
+size_t _CALLTYPE1 _msize_lk (
+
+#else	/* ndef MTHREAD */
+
+size_t _CALLTYPE1 _msize (
+
+#endif	/* MTHREAD */
+
+	void *pblck
+	)
+{
+#ifdef	DEBUG
+	if (!_CHECK_BACKPTR(pblck))
+		_heap_abort();
+#endif
+
+	return( (size_t) ((char *)_ADDRESS(_BACKPTR(pblck)->pnextdesc) -
+	(char *)pblck) );
+}
+
+
+#else	/* _WIN32DOS_ */
+
+/*
+ * TEMPORARY HACK! THE CODE BELOW IS INTENDED TO ALLOW LIMITED USE OF THE
+ * C RUNTIME ON WIN32/DOS. IT WILL BE DELETED AS SOON AS THEY IMPLEMENT
+ * VirtualAlloc()!
+ */
+
+#include <cruntime.h>
+#include <oscalls.h>
+#include <malloc.h>
+
+extern HANDLE _HeapHandle;
+
+size_t _CALLTYPE1 _msize (
+	void *pblck
+	)
+{
+	return( (size_t)HeapSize(_HeapHandle, pblck) );
+}
+
+#endif	/* _WIN32DOS_ */