crt: Implement __mingw_aligned_msize() function
Its API is same as MS CRT _aligned_msize() function.
It can be used only on the memory allocated and returned by the
__mingw_aligned_offset_malloc() and __mingw_aligned_offset_realloc()
functions.
Signed-off-by: Martin Storsjö <martin@martin.st>
diff --git a/mingw-w64-crt/misc/mingw-aligned-malloc.c b/mingw-w64-crt/misc/mingw-aligned-malloc.c
index 5029b60..be07ed6 100644
--- a/mingw-w64-crt/misc/mingw-aligned-malloc.c
+++ b/mingw-w64-crt/misc/mingw-aligned-malloc.c
@@ -118,3 +118,28 @@
{
return __mingw_aligned_offset_realloc (memblock, size, alignment, 0);
}
+
+size_t
+__mingw_aligned_msize (void *memblock, size_t alignment, size_t offset)
+{
+ void *p0;
+
+ if (!memblock || NOT_POWER_OF_TWO (alignment))
+ {
+ errno = EINVAL;
+ return (size_t)-1;
+ }
+ if (alignment < sizeof (void *))
+ alignment = sizeof (void *);
+
+ p0 = ORIG_PTR (memblock);
+
+ /* It is an error if the alignment or offset does not match. */
+ if (memblock != PTR_ALIGN (p0, alignment, offset))
+ {
+ errno = EINVAL;
+ return (size_t)-1;
+ }
+
+ return _msize (p0) - (alignment + sizeof (void *));
+}
diff --git a/mingw-w64-headers/crt/malloc.h b/mingw-w64-headers/crt/malloc.h
index cc72d4c..81d70ca 100644
--- a/mingw-w64-headers/crt/malloc.h
+++ b/mingw-w64-headers/crt/malloc.h
@@ -133,6 +133,7 @@
void * __mingw_aligned_offset_realloc (void *_Memory, size_t _Size, size_t _Alignment, size_t _Offset);
void * __mingw_aligned_offset_malloc (size_t, size_t, size_t);
void * __mingw_aligned_realloc (void *_Memory, size_t _Size, size_t _Offset);
+size_t __mingw_aligned_msize (void *memblock, size_t alignment, size_t offset);
#if defined(__x86_64__) || defined(__i386__)
/* Get the compiler's definition of _mm_malloc and _mm_free. */
