More link stuff, stumped on sub_807A728

asm/trade.s

@@ -6,81 +6,6 @@
 
 	.text
 
-	thumb_func_start sub_807A728
-sub_807A728: @ 807A728
-	push {r4-r7,lr}
-	ldr r0, =gReceivedRemoteLinkPlayers
-	ldrb r0, [r0]
-	cmp r0, 0
-	beq _0807A7B4
-	movs r4, 0
-	bl GetMultiplayerId
-	ldr r5, =gLinkPlayers
-	movs r7, 0x1
-	eors r0, r7
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, r0, 3
-	subs r1, r0
-	lsls r1, 2
-	adds r1, r5
-	ldrb r1, [r1]
-	subs r0, r1, 0x1
-	lsls r0, 16
-	lsrs r0, 16
-	cmp r0, 0x2
-	bls _0807A7B4
-	subs r0, r1, 0x4
-	lsls r0, 16
-	lsrs r0, 16
-	cmp r0, 0x1
-	bhi _0807A762
-	movs r4, 0x2
-_0807A762:
-	cmp r4, 0
-	ble _0807A7B4
-	bl GetMultiplayerId
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, r0, 3
-	subs r1, r0
-	lsls r1, 2
-	adds r1, r5
-	ldrb r1, [r1, 0x12]
-	movs r6, 0xF0
-	adds r0, r6, 0
-	ands r0, r1
-	cmp r0, 0
-	beq _0807A7B0
-	cmp r4, 0x2
-	bne _0807A7B4
-	bl GetMultiplayerId
-	eors r0, r7
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, r0, 3
-	subs r1, r0
-	lsls r1, 2
-	adds r1, r5
-	ldrb r1, [r1, 0x12]
-	adds r0, r6, 0
-	ands r0, r1
-	cmp r0, 0
-	bne _0807A7B4
-	movs r0, 0x2
-	b _0807A7B6
-	.pool
-_0807A7B0:
-	movs r0, 0x1
-	b _0807A7B6
-_0807A7B4:
-	movs r0, 0
-_0807A7B6:
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_807A728
-
 	thumb_func_start sub_807A7BC
 sub_807A7BC: @ 807A7BC
 	push {lr}

src/trade.c

@@ -3195,3 +3195,50 @@ u32 sub_807A5F4(struct Pokemon *a0, int a1, int a2)
         return 1;
     }
 }
+
+s32 sub_807A728(void)
+{
+    int val;
+    u8 version;
+    
+    if (gReceivedRemoteLinkPlayers != 0)
+    {
+        val = 0;
+        version = (gLinkPlayers[GetMultiplayerId() ^ 1].version & 0xFF);
+        if (version == VERSION_RUBY ||
+            version == VERSION_SAPPHIRE ||
+            version == VERSION_EMERALD)
+        {
+            // this value could actually be anything 0 or less
+            val = 0;
+        }
+        else if (version == VERSION_FIRE_RED ||
+                 version == VERSION_LEAF_GREEN)
+        {
+            val = 2;
+        }
+
+        if (val > 0)
+        {
+            if (gLinkPlayers[GetMultiplayerId()].name[10] & 0xF0)
+            {
+                if (val == 2)
+                {
+                    if (gLinkPlayers[GetMultiplayerId() ^ 1].name[10] & 0xF0)
+                    {
+                        return 0;
+                    }
+                    else
+                    {
+                        return 2;
+                    }
+                }
+            }
+            else
+            {
+                return 1;
+            }
+        }
+    }
+    return 0;
+}