From 4f342198c2e4c579d0f3b42aa85eb6699145ad5f Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Wed, 6 Dec 2017 23:55:40 -0500
Subject: [PATCH] sub_800E88C

---
 asm/link_rfu.s     | 109 ---------------------------------------------
 include/link_rfu.h |   4 +-
 src/link_rfu.c     |  44 ++++++++++++++++++
 3 files changed, 47 insertions(+), 110 deletions(-)

diff --git a/asm/link_rfu.s b/asm/link_rfu.s
index 94eb4a625..17bf9231c 100644
--- a/asm/link_rfu.s
+++ b/asm/link_rfu.s
@@ -5,115 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_800E88C
-sub_800E88C: @ 800E88C
-	push {r4-r7,lr}
-	adds r2, r0, 0
-	adds r5, r1, 0
-	movs r4, 0x1
-	adds r1, r2, 0
-	movs r6, 0
-	movs r0, 0x1
-	negs r0, r0
-	cmp r5, r0
-	bne _0800E8CC
-	movs r3, 0
-	movs r5, 0x1
-	ldr r1, =gUnknown_03005000+0xCDE
-_0800E8A6:
-	adds r0, r2, 0
-	ands r0, r5
-	cmp r0, 0
-	beq _0800E8B8
-	adds r0, r3, r1
-	strb r4, [r0]
-	adds r0, r4, 0x1
-	lsls r0, 24
-	lsrs r4, r0, 24
-_0800E8B8:
-	asrs r2, 1
-	adds r0, r3, 0x1
-	lsls r0, 24
-	lsrs r3, r0, 24
-	cmp r3, 0x3
-	bls _0800E8A6
-	b _0800E942
-	.pool
-_0800E8CC:
-	movs r3, 0
-	mvns r0, r1
-	mov r12, r0
-	movs r7, 0x1
-	ldr r4, =gUnknown_03005000+0xCDE
-_0800E8D6:
-	adds r2, r1, 0
-	ands r2, r7
-	cmp r2, 0
-	bne _0800E8E2
-	adds r0, r3, r4
-	strb r2, [r0]
-_0800E8E2:
-	asrs r1, 1
-	adds r0, r3, 0x1
-	lsls r0, 24
-	lsrs r3, r0, 24
-	cmp r3, 0x3
-	bls _0800E8D6
-	movs r4, 0x4
-	ldr r0, =gUnknown_03005000+0xCDE
-	ldrb r7, [r0]
-_0800E8F4:
-	movs r3, 0
-	subs r1, r4, 0x1
-	cmp r7, r4
-	beq _0800E910
-	ldr r2, =gUnknown_03005000+0xCDE
-_0800E8FE:
-	adds r0, r3, 0x1
-	lsls r0, 24
-	lsrs r3, r0, 24
-	cmp r3, 0x3
-	bhi _0800E910
-	adds r0, r3, r2
-	ldrb r0, [r0]
-	cmp r0, r4
-	bne _0800E8FE
-_0800E910:
-	cmp r3, 0x4
-	bne _0800E916
-	adds r6, r4, 0
-_0800E916:
-	lsls r0, r1, 24
-	lsrs r4, r0, 24
-	cmp r4, 0
-	bne _0800E8F4
-	mov r0, r12
-	ands r5, r0
-	movs r3, 0
-	movs r2, 0x1
-	ldr r1, =gUnknown_03005000+0xCDE
-_0800E928:
-	adds r0, r5, 0
-	ands r0, r2
-	cmp r0, 0
-	beq _0800E936
-	adds r0, r3, r1
-	strb r6, [r0]
-	adds r6, 0x1
-_0800E936:
-	asrs r5, 1
-	adds r0, r3, 0x1
-	lsls r0, 24
-	lsrs r3, r0, 24
-	cmp r3, 0x3
-	bls _0800E928
-_0800E942:
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_800E88C
-
 	thumb_func_start sub_800E94C
 sub_800E94C: @ 800E94C
 	push {r4-r7,lr}
diff --git a/include/link_rfu.h b/include/link_rfu.h
index f0b8ca84c..54d513b10 100644
--- a/include/link_rfu.h
+++ b/include/link_rfu.h
@@ -143,7 +143,9 @@ struct UnkRfuStruct_2 {
     /* 0xc3c */ u8 filler_c3c[3];
     /* 0xc3f */ u8 filler_c3f[0x9c];
     /* 0xcdb */ vu8 unk_cdb;
-    /* 0xcdc */ u8 filler_cdc[0x18];
+    /* 0xcdc */ u8 filler_cdc[2];
+    /* 0xcde */ u8 unk_cde[4];
+    /* 0xce2 */ u8 filler_ce2[18];
 }; // size = 0xcf4
 
 // Exported RAM declarations
diff --git a/src/link_rfu.c b/src/link_rfu.c
index e21e79c41..46a765709 100644
--- a/src/link_rfu.c
+++ b/src/link_rfu.c
@@ -2523,3 +2523,47 @@ u8 sub_800E87C(u8 idx)
 {
     return gUnknown_082ED6A5[idx];
 }
+
+void sub_800E88C(int r2, int r5)
+{
+    u8 i;
+    u8 r4 = 1;
+    int r1 = r2;
+    int r6 = 0;
+    if (r5 == -1)
+    {
+        for (i = 0; i < 4; r2 >>= 1, i++)
+        {
+            if (r2 & 1)
+            {
+                gUnknown_03005000.unk_cde[i] = r4;
+                r4++;
+            }
+        }
+    }
+    else
+    {
+        for (i = 0; i < 4; r1 >>= 1, i++)
+        {
+            if (!(r1 & 1))
+            {
+                gUnknown_03005000.unk_cde[i] = 0;
+            }
+        }
+        for (r4 = 4; r4 != 0; r4--)
+        {
+            for (i = 0; i < 4 && gUnknown_03005000.unk_cde[i] != r4; i++);
+            if (i == 4)
+            {
+                r6 = r4;
+            }
+        }
+        for (r5 &= ~r2, i = 0; i < 4; r5 >>= 1, i++)
+        {
+            if (r5 & 1)
+            {
+                gUnknown_03005000.unk_cde[i] = r6++;
+            }
+        }
+    }
+}