From 9a9f6012441a4ed0f7ba1566a3f693801957ef12 Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Wed, 8 Nov 2017 19:58:59 -0500
Subject: [PATCH] sub_8009900

---
 asm/link.s     | 86 --------------------------------------------------
 include/link.h |  1 +
 include/save.h |  2 +-
 src/link.c     | 38 +++++++++++++++++++++-
 4 files changed, 39 insertions(+), 88 deletions(-)

diff --git a/asm/link.s b/asm/link.s
index 28d2ec0c9..345a68899 100644
--- a/asm/link.s
+++ b/asm/link.s
@@ -5,92 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_8009900
-sub_8009900: @ 8009900
-	push {r4,r5,lr}
-	sub sp, 0x4
-	ldr r4, =gMain
-	ldrh r1, [r4, 0x2E]
-	movs r0, 0x1
-	ands r0, r1
-	cmp r0, 0
-	beq _08009916
-	ldr r1, =gUnknown_03003144
-	movs r0, 0x1
-	strb r0, [r1]
-_08009916:
-	ldrh r1, [r4, 0x2C]
-	movs r5, 0x2
-	adds r0, r5, 0
-	ands r0, r1
-	cmp r0, 0
-	beq _0800992A
-	ldr r0, =0x02004000
-	ldr r1, =0x00002004
-	bl sub_800A2F4
-_0800992A:
-	ldrh r1, [r4, 0x2E]
-	movs r0, 0x80
-	lsls r0, 2
-	ands r0, r1
-	cmp r0, 0
-	beq _08009946
-	movs r0, 0x1
-	negs r0, r0
-	str r5, [sp]
-	movs r1, 0
-	movs r2, 0x10
-	movs r3, 0
-	bl BeginNormalPaletteFade
-_08009946:
-	ldrh r1, [r4, 0x2E]
-	movs r0, 0x8
-	ands r0, r1
-	cmp r0, 0
-	beq _08009956
-	movs r0, 0x1
-	bl sub_800B330
-_08009956:
-	ldrh r1, [r4, 0x2E]
-	movs r0, 0x80
-	lsls r0, 1
-	ands r0, r1
-	cmp r0, 0
-	beq _08009968
-	movs r0, 0x1
-	bl TrySavingData
-_08009968:
-	ldrh r1, [r4, 0x2E]
-	movs r0, 0x4
-	ands r0, r1
-	cmp r0, 0
-	beq _08009976
-	bl sub_800AC34
-_08009976:
-	ldr r0, =gUnknown_020223BC
-	ldrb r0, [r0]
-	cmp r0, 0
-	beq _08009996
-	ldr r2, [r4, 0x24]
-	ldr r0, =gUnknown_03002748
-	ldrb r1, [r0]
-	ldr r0, =gUnknown_03003140
-	ldr r0, [r0]
-	cmp r0, 0
-	bne _08009990
-	movs r0, 0x10
-	orrs r1, r0
-_08009990:
-	adds r0, r2, 0
-	bl sub_800A994
-_08009996:
-	add sp, 0x4
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8009900
-
 	thumb_func_start c2_08009A8C
 c2_08009A8C: @ 80099BC
 	push {lr}
diff --git a/include/link.h b/include/link.h
index 662f8e5cd..5d9471826 100644
--- a/include/link.h
+++ b/include/link.h
@@ -196,6 +196,7 @@ void sub_800AC34(void);
 
 void sub_800B628(void);
 void sub_80097E8(void);
+void sub_800A994(u32 seed, u8 flags);
 
 extern u16 gUnknown_03003020[6];
 extern u32 gUnknown_0300302C;
diff --git a/include/save.h b/include/save.h
index 6c1238cd2..f010b3415 100644
--- a/include/save.h
+++ b/include/save.h
@@ -77,7 +77,7 @@ u8 GetSaveValidStatus(const struct SaveSectionLocation *location);
 u8 DoReadFlashWholeSection(u8, struct SaveSection *);
 u16 CalculateChecksum(void *, u16);
 u8 HandleSavingData(u8 saveType);
-//u8 TrySavingData(u8 saveType);
+u8 TrySavingData(u8 saveType);
 //u8 sub_8125D80(void);
 //bool8 sub_8125DA8(void);
 //u8 sub_8125DDC(void);
diff --git a/src/link.c b/src/link.c
index 823a9a96b..327a170d0 100644
--- a/src/link.c
+++ b/src/link.c
@@ -1,6 +1,8 @@
 
 // Includes
 #include "global.h"
+#include "malloc.h"
+#include "save.h"
 #include "librfu.h"
 #include "rng.h"
 #include "string_util.h"
@@ -97,13 +99,15 @@ void sub_8009638(void);
 void sub_80096BC(void);
 void c2_08009A8C(void);
 void sub_800A2E0(void);
+void sub_800A2F4(void *heapptr, size_t src);
 void task00_link_test(u8 taskId);
 u16 sub_800A648(u16 *src, u16 size);
 void sub_800A6E8(u32 pos, u8 a0, u8 a1, u8 a2);
 void sub_800A824(void);
-void sub_800B594(void);
+void sub_800B330(bool8 flag);
 void sub_800B4A4(void);
 void sub_800B53C(void);
+void sub_800B594(void);
 u32 sub_800BEC0(void);
 void sub_800E700(void);
 void sub_800EDD4(void);
@@ -348,3 +352,35 @@ void sub_8009818(void)
         }
     }
 }
+
+void sub_8009900(void)
+{
+    if (gMain.newKeys & A_BUTTON)
+    {
+        gUnknown_03003144 = TRUE;
+    }
+    if (gMain.heldKeys & B_BUTTON)
+    {
+        sub_800A2F4(gHeap + 0x4000, 0x00002004);
+    }
+    if (gMain.newKeys & L_BUTTON)
+    {
+        BeginNormalPaletteFade(-1, 0, 16, 0, 2);
+    }
+    if (gMain.newKeys & START_BUTTON)
+    {
+        sub_800B330(1);
+    }
+    if (gMain.newKeys & R_BUTTON)
+    {
+        TrySavingData(1);
+    }
+    if (gMain.newKeys & SELECT_BUTTON)
+    {
+        sub_800AC34();
+    }
+    if (gUnknown_020223BC)
+    {
+        sub_800A994(gMain.vblankCounter2, gUnknown_03003140 ? gUnknown_03002748 : gUnknown_03002748 | 0x10);
+    }
+}