Decompile two seagallop-related functions stuck in unk_8147500

asm/unk_8147500.s

@@ -5,118 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_8147500
-sub_8147500: @ 8147500
-	push {lr}
-	ldr r0, _08147518 @ =gSpecialVar_0x8004
-	ldrh r1, [r0]
-	ldr r0, _0814751C @ =gSpecialVar_0x8006
-	ldrh r2, [r0]
-	cmp r1, 0x8
-	beq _08147512
-	cmp r2, 0x8
-	bne _08147520
-_08147512:
-	movs r0, 0x1
-	b _0814758E
-	.align 2, 0
-_08147518: .4byte gSpecialVar_0x8004
-_0814751C: .4byte gSpecialVar_0x8006
-_08147520:
-	cmp r1, 0
-	beq _08147528
-	cmp r2, 0
-	bne _0814752C
-_08147528:
-	movs r0, 0x7
-	b _0814758E
-_0814752C:
-	cmp r1, 0x9
-	beq _08147534
-	cmp r2, 0x9
-	bne _08147538
-_08147534:
-	movs r0, 0xA
-	b _0814758E
-_08147538:
-	cmp r1, 0xA
-	beq _08147540
-	cmp r2, 0xA
-	bne _08147544
-_08147540:
-	movs r0, 0xC
-	b _0814758E
-_08147544:
-	subs r0, r1, 0x1
-	lsls r0, 16
-	lsrs r0, 16
-	cmp r0, 0x2
-	bhi _0814755C
-	subs r0, r2, 0x1
-	lsls r0, 16
-	lsrs r0, 16
-	cmp r0, 0x2
-	bhi _0814755C
-	movs r0, 0x2
-	b _0814758E
-_0814755C:
-	subs r0, r1, 0x4
-	lsls r0, 16
-	lsrs r0, 16
-	cmp r0, 0x1
-	bhi _08147574
-	subs r0, r2, 0x4
-	lsls r0, 16
-	lsrs r0, 16
-	cmp r0, 0x1
-	bhi _08147574
-	movs r0, 0x3
-	b _0814758E
-_08147574:
-	subs r0, r1, 0x6
-	lsls r0, 16
-	lsrs r0, 16
-	cmp r0, 0x1
-	bhi _0814758C
-	subs r0, r2, 0x6
-	lsls r0, 16
-	lsrs r0, 16
-	cmp r0, 0x1
-	bhi _0814758C
-	movs r0, 0x5
-	b _0814758E
-_0814758C:
-	movs r0, 0x6
-_0814758E:
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8147500
-
-	thumb_func_start sub_8147594
-sub_8147594: @ 8147594
-	push {lr}
-	ldr r0, _081475B0 @ =gSaveBlock1Ptr
-	ldr r2, [r0]
-	ldrh r1, [r2, 0x4]
-	ldr r0, _081475B4 @ =0x00000503
-	cmp r1, r0
-	bne _081475B8
-	movs r1, 0
-	ldrsh r0, [r2, r1]
-	cmp r0, 0x17
-	bgt _081475B8
-	movs r0, 0x1
-	b _081475BA
-	.align 2, 0
-_081475B0: .4byte gSaveBlock1Ptr
-_081475B4: .4byte 0x00000503
-_081475B8:
-	movs r0, 0
-_081475BA:
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8147594
-
 	thumb_func_start sub_81475C0
 sub_81475C0: @ 81475C0
 	push {r4,r5,lr}

src/seagallop.c

@@ -458,3 +458,42 @@ static bool8 GetDirectionOfTravel(void)
     }
     return (sTravelDirectionMatrix[gSpecialVar_0x8004] >> gSpecialVar_0x8006) & 1;
 }
+
+u8 sub_8147500(void)
+{
+    u16 originId, destId;
+
+    originId = gSpecialVar_0x8004;
+    destId = gSpecialVar_0x8006;
+
+    if (originId == SEAGALLOP_CINNABAR_ISLAND || destId == SEAGALLOP_CINNABAR_ISLAND)
+        return 1;
+
+    if (originId == SEAGALLOP_VERMILION_CITY || destId == SEAGALLOP_VERMILION_CITY)
+        return 7;
+
+    if (originId == SEAGALLOP_NAVEL_ROCK || destId == SEAGALLOP_NAVEL_ROCK)
+        return 10;
+
+    if (originId == SEAGALLOP_BIRTH_ISLAND || destId == SEAGALLOP_BIRTH_ISLAND)
+        return 12;
+
+    if ((originId == SEAGALLOP_ONE_ISLAND || originId == SEAGALLOP_TWO_ISLAND || originId == SEAGALLOP_THREE_ISLAND) && (destId == SEAGALLOP_ONE_ISLAND || destId == SEAGALLOP_TWO_ISLAND || destId == SEAGALLOP_THREE_ISLAND))
+        return 2;
+
+    if ((originId == SEAGALLOP_FOUR_ISLAND || originId == SEAGALLOP_FIVE_ISLAND) && (destId == SEAGALLOP_FOUR_ISLAND || destId == SEAGALLOP_FIVE_ISLAND))
+        return 3;
+
+    if ((originId == SEAGALLOP_SIX_ISLAND || originId == SEAGALLOP_SEVEN_ISLAND) && (destId == SEAGALLOP_SIX_ISLAND || destId == SEAGALLOP_SEVEN_ISLAND))
+        return 5;
+
+    return 6;
+}
+
+bool8 sub_8147594(void)
+{
+    if (gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(VERMILIONCITY) && gSaveBlock1Ptr->location.mapNum == MAP_NUM(VERMILIONCITY) && gSaveBlock1Ptr->pos.x < 24)
+        return TRUE;
+
+    return FALSE;
+}