C11: add aligned_alloc()

Change-Id: If648c0e27ed946874d393e8e33a4548b70c8ecdb
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3377
Reviewed-by: Adrien Destugues <[email protected]>

headers/compatibility/bsd/features.h

@@ -12,4 +12,9 @@
 #endif
 
 
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+	#define _ISOC11_SOURCE
+#endif
+
+
 #endif // _FEATURES_H

headers/posix/stdlib.h

@@ -49,6 +49,9 @@ extern void		*calloc(size_t numElements, size_t size);
 extern void		free(void *pointer);
 extern void		*malloc(size_t size);
 extern int		posix_memalign(void **_pointer, size_t alignment, size_t size);
+#ifdef _ISOC11_SOURCE
+extern void 	*aligned_alloc(size_t alignment, size_t size);
+#endif
 extern void		*realloc(void *oldPointer, size_t newSize);
 
 /* process termination */

src/system/libroot/posix/malloc_hoard2/wrapper.cpp

@@ -443,6 +443,17 @@ memalign(size_t alignment, size_t size)
 }
 
 
+extern "C" void *
+aligned_alloc(size_t alignment, size_t size)
+{
+	if (size % alignment != 0) {
+		__set_errno(B_BAD_VALUE);
+		return NULL;
+	}
+	return memalign(alignment, size);
+}
+
+
 extern "C" int
 posix_memalign(void **_pointer, size_t alignment, size_t size)
 {