From d51f87226f029143dfb027f5e7bc36c64c5959eb Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Wed, 8 Nov 2017 20:11:29 -0500
Subject: [PATCH] sub_80099E0

---
 asm/link.s | 71 ------------------------------------------------------
 src/link.c | 46 ++++++++++++++++++++++++++++++++++-
 2 files changed, 45 insertions(+), 72 deletions(-)

diff --git a/asm/link.s b/asm/link.s
index 345a68899..cedc3077f 100644
--- a/asm/link.s
+++ b/asm/link.s
@@ -5,77 +5,6 @@
 
 	.text
 
-	thumb_func_start c2_08009A8C
-c2_08009A8C: @ 80099BC
-	push {lr}
-	bl sub_8009900
-	movs r0, 0x1
-	movs r1, 0x1
-	movs r2, 0
-	bl sub_8009818
-	bl RunTasks
-	bl AnimateSprites
-	bl BuildOamBuffer
-	bl UpdatePaletteFade
-	pop {r0}
-	bx r0
-	thumb_func_end c2_08009A8C
-
-	thumb_func_start sub_80099E0
-sub_80099E0: @ 80099E0
-	push {r4,r5,lr}
-	adds r4, r0, 0
-	ldr r0, =gUnknown_020229C4
-	ldrb r0, [r0]
-	cmp r0, 0
-	bne _080099F4
-	movs r0, 0
-	b _08009A3C
-	.pool
-_080099F4:
-	movs r1, 0
-	ldr r5, =gUnknown_03003084
-	ldr r3, =gUnknown_03003110
-	movs r2, 0
-_080099FC:
-	lsls r0, r1, 1
-	adds r0, r3
-	strh r2, [r0]
-	adds r0, r1, 0x1
-	lsls r0, 24
-	lsrs r1, r0, 24
-	cmp r1, 0x7
-	bls _080099FC
-	ldrh r0, [r4]
-	strh r0, [r5]
-	ldr r0, =gUnknown_030030E0
-	ldr r0, [r0]
-	movs r1, 0x40
-	ands r0, r1
-	cmp r0, 0
-	beq _08009A38
-	ldr r0, =0x04000128
-	ldr r0, [r0]
-	lsls r0, 26
-	lsrs r0, 30
-	bl sub_8009AA0
-	ldr r0, =gUnknown_03003140
-	ldr r0, [r0]
-	cmp r0, 0
-	beq _08009A34
-	bl _call_via_r0
-_08009A34:
-	bl sub_800AEB4
-_08009A38:
-	ldr r0, =gUnknown_030030E0
-	ldrh r0, [r0]
-_08009A3C:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_80099E0
-
 	thumb_func_start sub_8009A58
 sub_8009A58: @ 8009A58
 	push {r4-r6,lr}
diff --git a/src/link.c b/src/link.c
index 327a170d0..c07a6d701 100644
--- a/src/link.c
+++ b/src/link.c
@@ -31,6 +31,13 @@ struct LinkTestBGInfo
     u32 dummy_C;
 };
 
+struct SIOCnt {
+    u32 cnt0_0:4;
+    u32 cnt0_2:2;
+};
+
+#define REG_SIOCNT_STRUCT (*(volatile struct SIOCnt *)REG_ADDR_SIOCNT)
+
 // Static RAM declarations
 
 IWRAM_DATA struct BlockTransfer gUnknown_03000D10;
@@ -98,12 +105,14 @@ struct LinkPlayer gUnknown_020229CC = {};
 void sub_8009638(void);
 void sub_80096BC(void);
 void c2_08009A8C(void);
+void sub_8009AA0(u8 unused);
 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_800AEB4(void);
 void sub_800B330(bool8 flag);
 void sub_800B4A4(void);
 void sub_800B53C(void);
@@ -316,7 +325,7 @@ void sub_80097E8(void)
     sub_800B53C();
 }
 
-void sub_8009818(void)
+static void sub_8009818(u8 nothing, u8 is, u8 used)
 {
     u8 i;
     u8 status;
@@ -384,3 +393,38 @@ void sub_8009900(void)
         sub_800A994(gMain.vblankCounter2, gUnknown_03003140 ? gUnknown_03002748 : gUnknown_03002748 | 0x10);
     }
 }
+
+void c2_08009A8C(void)
+{
+    sub_8009900();
+    sub_8009818(1, 1, 0);
+    RunTasks();
+    AnimateSprites();
+    BuildOamBuffer();
+    UpdatePaletteFade();
+}
+
+u16 sub_80099E0(const u16 *src)
+{
+    u8 i;
+
+    if (!gUnknown_020229C4)
+    {
+        return 0;
+    }
+    for (i = 0; i < 8; i ++)
+    {
+        gUnknown_03003110[i] = 0;
+    }
+    gUnknown_03003084 = *src;
+    if (gUnknown_030030E0 & 0x40)
+    {
+        sub_8009AA0(REG_SIOCNT_STRUCT.cnt0_2);
+        if (gUnknown_03003140 != NULL)
+        {
+            gUnknown_03003140();
+        }
+        sub_800AEB4();
+    }
+    return gUnknown_030030E0;
+}