help_system_812B1E0: through sub_812B27C

asm/help_system_812B1E0.s

@@ -5,71 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_812B25C
-sub_812B25C: @ 812B25C
-	push {lr}
-	ldr r0, _0812B268 @ =gUnknown_845C594
-	bl sub_812B27C
-	pop {r1}
-	bx r1
-	.align 2, 0
-_0812B268: .4byte gUnknown_845C594
-	thumb_func_end sub_812B25C
-
-	thumb_func_start sub_812B26C
-sub_812B26C: @ 812B26C
-	push {lr}
-	ldr r0, _0812B278 @ =gUnknown_845C5BC
-	bl sub_812B27C
-	pop {r1}
-	bx r1
-	.align 2, 0
-_0812B278: .4byte gUnknown_845C5BC
-	thumb_func_end sub_812B26C
-
-	thumb_func_start sub_812B27C
-sub_812B27C: @ 812B27C
-	push {r4,lr}
-	adds r2, r0, 0
-	ldr r0, _0812B2AC @ =gSaveBlock1Ptr
-	ldr r0, [r0]
-	movs r1, 0x4
-	ldrsb r1, [r0, r1]
-	lsls r1, 8
-	ldrb r0, [r0, 0x5]
-	lsls r0, 24
-	asrs r0, 24
-	adds r0, r1
-	lsls r0, 16
-	lsrs r3, r0, 16
-	ldrh r0, [r2]
-	ldr r1, _0812B2B0 @ =0x0000ffff
-	cmp r0, r1
-	beq _0812B2BC
-	adds r4, r1, 0
-	adds r1, r2, 0
-_0812B2A2:
-	ldrh r0, [r1]
-	cmp r0, r3
-	bne _0812B2B4
-	movs r0, 0x1
-	b _0812B2BE
-	.align 2, 0
-_0812B2AC: .4byte gSaveBlock1Ptr
-_0812B2B0: .4byte 0x0000ffff
-_0812B2B4:
-	adds r1, 0x2
-	ldrh r0, [r1]
-	cmp r0, r4
-	bne _0812B2A2
-_0812B2BC:
-	movs r0, 0
-_0812B2BE:
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_812B27C
-
 	thumb_func_start sub_812B2C4
 sub_812B2C4: @ 812B2C4
 	push {r4-r7,lr}

data/help_system_812B1E0.s

@@ -72,7 +72,7 @@ gUnknown_845C594:: @ 845C594
 	.2byte MAP_FOUR_ISLAND_MART
 	.2byte MAP_SEVEN_ISLAND_MART
 	.2byte MAP_SIX_ISLAND_MART
-	.2byte 0xffff
+	.2byte MAP_UNDEFINED
 
 gUnknown_845C5BC:: @ 845C5BC
 	.2byte MAP_PEWTER_CITY_GYM
@@ -83,7 +83,7 @@ gUnknown_845C5BC:: @ 845C5BC
 	.2byte MAP_SAFFRON_CITY_GYM
 	.2byte MAP_CINNABAR_ISLAND_GYM
 	.2byte MAP_VIRIDIAN_CITY_GYM
-	.2byte 0xffff
+	.2byte MAP_UNDEFINED
 
 gUnknown_845C5CE:: @ 845C5CE
 	.byte 0x01, 0x00, 0x01 @ MAP_VIRIDIAN_FOREST

src/help_system_812B1E0.c

@@ -1,11 +1,17 @@
 #include "global.h"
 #include "event_data.h"
+#include "constants/maps.h"
 
 EWRAM_DATA u16 gUnknown_203B0EC = 0;
 EWRAM_DATA u8 gUnknown_203B0EE = 0;
 
 u16 gUnknown_3005EA0;
 
+bool32 sub_812B27C(const u16 * mapIdxs);
+
+extern const u16 gUnknown_845C594[]; // marts
+extern const u16 gUnknown_845C5BC[]; // gyms
+
 void sub_812B1E0(u8 a0)
 {
     gUnknown_203B0EC = a0;
@@ -42,3 +48,28 @@ void sub_812B248(void)
 {
     gUnknown_203B0EC = gUnknown_3005EA0;
 }
+
+bool32 sub_812B25C(void)
+{
+    return sub_812B27C(gUnknown_845C594);
+}
+
+bool32 sub_812B26C(void)
+{
+    return sub_812B27C(gUnknown_845C5BC);
+}
+
+bool32 sub_812B27C(const u16 * mapIdxs)
+{
+    u16 mapIdx = (gSaveBlock1Ptr->location.mapGroup << 8) + gSaveBlock1Ptr->location.mapNum;
+    s32 i;
+
+    for (i = 0; mapIdxs[i] != MAP_UNDEFINED; i++)
+    {
+        if (mapIdxs[i] == mapIdx)
+            return TRUE;
+    }
+
+    return FALSE;
+}
+