From a77e8ae1cd0521abff12be11d76d9ded36aebeeb Mon Sep 17 00:00:00 2001
From: fincs <fincs.alt1@gmail.com>
Date: Mon, 3 Nov 2014 20:20:33 +0100
Subject: [PATCH] Add linearSpaceFree() for retrieving the free space in the
 linear heap

---
 libctru/include/3ds/linear.h          | 1 +
 libctru/source/allocator/linear.cpp   | 5 +++++
 libctru/source/allocator/mem_pool.cpp | 8 ++++++++
 libctru/source/allocator/mem_pool.h   | 1 +
 4 files changed, 15 insertions(+)

diff --git a/libctru/include/3ds/linear.h b/libctru/include/3ds/linear.h
index f42a8b9..ae4c915 100644
--- a/libctru/include/3ds/linear.h
+++ b/libctru/include/3ds/linear.h
@@ -4,3 +4,4 @@
 void* linearAlloc(size_t size);
 void* linearRealloc(void* mem, size_t size);
 void linearFree(void* mem);
+u32 linearSpaceFree(); // get free linear space in bytes
diff --git a/libctru/source/allocator/linear.cpp b/libctru/source/allocator/linear.cpp
index a7581e8..83d1143 100644
--- a/libctru/source/allocator/linear.cpp
+++ b/libctru/source/allocator/linear.cpp
@@ -48,3 +48,8 @@ void linearFree(void* mem)
 	auto pChunk = (MemChunk*)((u8*)mem - 16);
 	sLinearPool.Deallocate(*pChunk);
 }
+
+u32 linearSpaceFree()
+{
+	return sLinearPool.GetFreeSpace();
+}
diff --git a/libctru/source/allocator/mem_pool.cpp b/libctru/source/allocator/mem_pool.cpp
index 93eeb4f..2c32638 100644
--- a/libctru/source/allocator/mem_pool.cpp
+++ b/libctru/source/allocator/mem_pool.cpp
@@ -123,3 +123,11 @@ void MemPool::Dump(const char* title)
 		printf("  - %p (%u bytes)\n", b->base, b->size);
 }
 */
+
+u32 MemPool::GetFreeSpace()
+{
+	u32 acc = 0;
+	for (auto b = first; b; b = b->next)
+		acc += b->size;
+	return acc;
+}
diff --git a/libctru/source/allocator/mem_pool.h b/libctru/source/allocator/mem_pool.h
index 7237f49..b75d195 100644
--- a/libctru/source/allocator/mem_pool.h
+++ b/libctru/source/allocator/mem_pool.h
@@ -85,4 +85,5 @@ struct MemPool
 	}
 
 	//void Dump(const char* title);
+	u32 GetFreeSpace();
 };