Change wutnewlib to implement malloc family of functions.

This allows us to forward them straight to default heap functions, this
is better than having to allocate a fixed heap for sbrk as it allows
people to better mix usage malloc & default heap functions.

libraries/wutnewlib/CMakeLists.txt

@@ -5,6 +5,7 @@ add_library(wutnewlib
    wut_clock.c
    wut_gettod_r.c
    wut_lock.c
+   wut_malloc.c
    wut_malloc_lock.c
    wut_nanosleep.c
    wut_newlib.c

libraries/wutnewlib/wut_malloc.c

@@ -0,0 +1,88 @@
+#include <coreinit/memexpheap.h>
+#include <coreinit/memdefaultheap.h>
+#include <coreinit/memorymap.h>
+#include <malloc.h>
+#include <string.h>
+
+void *
+_malloc_r(struct _reent *r, size_t size)
+{
+   return MEMAllocFromDefaultHeap(size);
+}
+
+void
+_free_r(struct _reent *r, void *ptr)
+{
+   MEMFreeToDefaultHeap(ptr);
+}
+
+void *
+_realloc_r(struct _reent *r, void *ptr, size_t size)
+{
+   void *new_ptr = _malloc_r(r, size);
+   if (!ptr || !new_ptr) {
+      return new_ptr;
+   }
+
+   memcpy(new_ptr, ptr, MEMGetSizeForMBlockExpHeap(ptr));
+   _free_r(r, ptr);
+   return new_ptr;
+}
+
+void *
+_calloc_r(struct _reent *r, size_t num, size_t size)
+{
+   void *ptr = _malloc_r(r, num * size);
+   if (ptr) {
+      memset(ptr, 0, num * size);
+   }
+
+   return ptr;
+}
+
+void *
+_memalign_r(struct _reent *r, size_t align, size_t size)
+{
+   return MEMAllocFromDefaultHeapEx(size, align);
+}
+
+struct mallinfo _mallinfo_r(struct _reent *r)
+{
+   struct mallinfo info = { 0 };
+   return info;
+}
+
+void
+_malloc_stats_r(struct _reent *r)
+{
+}
+
+int
+_mallopt_r(struct _reent *r, int param, int value)
+{
+   return 0;
+}
+
+size_t
+_malloc_usable_size_r(struct _reent *r, void *ptr)
+{
+   return MEMGetSizeForMBlockExpHeap(ptr);
+}
+
+void *
+_valloc_r(struct _reent *r, size_t size)
+{
+   return _memalign_r(r, OS_PAGE_SIZE, size);
+}
+
+void *
+_pvalloc_r(struct _reent *r, size_t size)
+{
+   return _memalign_r(r, OS_PAGE_SIZE, (size + (OS_PAGE_SIZE - 1)) & ~(OS_PAGE_SIZE - 1));
+}
+
+int
+_malloc_trim_r(struct _reent *r, size_t pad)
+{
+   return 0;
+}

libraries/wutnewlib/wut_sbrk.c

@@ -1,11 +1,10 @@
 #include "wut_newlib.h"
 
 #include <coreinit/atomic.h>
-#include <coreinit/memheap.h>
-#include <coreinit/memexpheap.h>
+#include <coreinit/memdefaultheap.h>
 
 static uint8_t *sHeapBase = NULL;
-static uint32_t sHeapMaxSize = 0;
+static uint32_t sHeapMaxSize = 128 * 1024;
 static volatile uint32_t sHeapSize = 0;
 
 void *
@@ -30,17 +29,16 @@ __wut_sbrk_r(struct _reent *r,
 void
 __init_wut_sbrk_heap()
 {
-   MEMHeapHandle heap = MEMGetBaseHeapHandle(MEM_BASE_HEAP_MEM2);
-   uint32_t freeSize = MEMGetAllocatableSizeForExpHeapEx(heap, 0x1000);
-
-   sHeapMaxSize = (uint32_t)(0.9f * (float)freeSize) & ~0xFFF;
-   sHeapBase = (uint8_t *)MEMAllocFromExpHeapEx(heap, sHeapMaxSize, 0x1000);
+   sHeapMaxSize = 128 * 1024;
+   sHeapBase = (uint8_t *)MEMAllocFromDefaultHeap(sHeapMaxSize);
    sHeapSize = 0;
 }
 
 void
 __fini_wut_sbrk_heap()
 {
-   MEMHeapHandle heap = MEMGetBaseHeapHandle(MEM_BASE_HEAP_MEM2);
-   MEMFreeToExpHeap(heap, sHeapBase);
+   MEMFreeToDefaultHeap(sHeapBase);
+   sHeapBase = NULL;
+   sHeapSize = 0;
+   sHeapMaxSize = 0;
 }