First Commit

externals/openal-soft/common/almalloc.cpp

@@ -0,0 +1,61 @@
+
+#include "config.h"
+
+#include "almalloc.h"
+
+#include <cassert>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+#include <memory>
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+
+
+void *al_malloc(size_t alignment, size_t size)
+{
+    assert((alignment & (alignment-1)) == 0);
+    alignment = std::max(alignment, alignof(std::max_align_t));
+
+#if defined(HAVE_POSIX_MEMALIGN)
+    void *ret{};
+    if(posix_memalign(&ret, alignment, size) == 0)
+        return ret;
+    return nullptr;
+#elif defined(HAVE__ALIGNED_MALLOC)
+    return _aligned_malloc(size, alignment);
+#else
+    size_t total_size{size + alignment-1 + sizeof(void*)};
+    void *base{std::malloc(total_size)};
+    if(base != nullptr)
+    {
+        void *aligned_ptr{static_cast<char*>(base) + sizeof(void*)};
+        total_size -= sizeof(void*);
+
+        std::align(alignment, size, aligned_ptr, total_size);
+        *(static_cast<void**>(aligned_ptr)-1) = base;
+        base = aligned_ptr;
+    }
+    return base;
+#endif
+}
+
+void *al_calloc(size_t alignment, size_t size)
+{
+    void *ret{al_malloc(alignment, size)};
+    if(ret) std::memset(ret, 0, size);
+    return ret;
+}
+
+void al_free(void *ptr) noexcept
+{
+#if defined(HAVE_POSIX_MEMALIGN)
+    std::free(ptr);
+#elif defined(HAVE__ALIGNED_MALLOC)
+    _aligned_free(ptr);
+#else
+    if(ptr != nullptr)
+        std::free(*(static_cast<void**>(ptr) - 1));
+#endif
+}