start decompiling item_use.c (#144)

* begin decompiling item_use.c

* decompile more of item_use.c

* commit what I have currently

* formatting

1 files changed, 410 insertions, 0 deletions

diff --git a/src/item_use.c b/src/item_use.c
new file mode 100644
index 000000000..fee70d7d2
--- /dev/null
+++ b/src/item_use.c
@@ -0,0 +1,410 @@
+#include "global.h"
+#include "task.h"
+#include "item.h"
+#include "palette.h"
+#include "weather.h"
+#include "string_util.h"
+#include "menu.h"
+#include "mail.h"
+#include "asm.h"
+#include "rom4.h"
+#include "metatile_behavior.h"
+#include "field_player_avatar.h"
+#include "flag.h"
+#include "map_obj_lock.h"
+#include "script.h"
+#include "field_player_avatar.h"
+#include "sound.h"
+
+extern void (* const gUnknown_083D61E4[])();
+extern void (* gUnknown_03005D00)(u8);
+extern void (* gUnknown_0300485C)(void);
+
+extern void sub_80A5B00(u8);
+extern void sub_80A5CC4(void);
+extern void sub_80C8FAC(u8);
+extern void DisplayItemMessageOnField(u8, u8*, TaskFunc, u16);
+extern void sub_80A5C48(u8);
+extern void sub_80A5C9C(u8);
+extern void ItemUseOutOfBattle_TMHM(u8);
+extern void ItemUseOutOfBattle_EvolutionStone(u8);
+extern void ItemUseOnFieldCB_Bike(u8);
+extern void ItemUseOnFieldCB_Rod(u8);
+extern void ItemUseOnFieldCB_Itemfinder(u8);
+extern void sub_80A5D04(void);
+extern bool8 sub_80E5EF4(void);
+extern void GetOnOffBike(u8);
+extern void sub_80C9458(u8);
+extern void sub_80C9520(u8);
+extern u8 sub_80C9908(s16, s16);
+extern void sub_80C997C(u8);
+extern void sub_80C99EC(u8);
+extern void sub_80C9A38(u8);
+
+extern u8 gOtherText_DadsAdvice[];
+extern u8 gOtherText_CantGetOffBike[];
+extern u8 gOtherText_NoResponse[];
+
+extern u8 gUnknown_083D61F0[];
+
+extern u16 gScriptItemId;
+
+bool8 ItemfinderCheckForHiddenItems(struct MapEvents *events, int);
+
+void sub_80C8FAC(u8 taskId)
+{
+    u8 taskData;
+
+    if(gScriptItemId == 0xAF)
+        taskData = gTasks[taskId].data[15] - 1;
+    else
+        taskData = ItemId_GetType(gScriptItemId) - 1;
+
+    gTasks[taskId].data[8] = (u32)gUnknown_083D61E4[taskData] >> 16;
+    gTasks[taskId].data[9] = (u32)gUnknown_083D61E4[taskData];
+    gTasks[taskId].func = sub_80A5B00;
+}
+
+void unknown_ItemMenu_Confirm(u8 var)
+{
+	sub_80C8FAC(var);
+	BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 16, 0);
+}
+
+void sub_80C9038(u8 var)
+{
+	sub_80C8FAC(var);
+	fade_screen(1, 0);
+}
+
+void SetUpItemUseOnFieldCallback(u8 taskId)
+{
+	if(gTasks[taskId].data[2] != 1)
+	{
+		gUnknown_0300485C = (void *)sub_80A5CC4;
+		unknown_ItemMenu_Confirm(taskId);
+	}
+	else
+		gUnknown_03005D00(taskId);
+}
+
+void sub_80C9098(u8 var1, u8 var2, const u8 *var3)
+{
+	StringExpandPlaceholders(gStringVar4, var3);
+	
+	if(!var2)
+	{
+		MenuZeroFillWindowRect(0, 13, 13, 20);
+		DisplayItemMessageOnField(var1, gStringVar4, sub_80A5C48, 1);
+	}
+	else
+		DisplayItemMessageOnField(var1, gStringVar4, sub_80A5C9C, 0);
+}
+
+void DisplayDadsAdviceCannotUseItemMessage(u8 var1, u8 var2)
+{
+	sub_80C9098(var1, var2, gOtherText_DadsAdvice);
+}
+
+void sub_80C9104(u8 var1, u8 var2)
+{
+	sub_80C9098(var1, var2, gOtherText_CantGetOffBike);
+}
+
+u8 CheckIfItemIsTMHMOrEvolutionStone(u16 itemId)
+{
+	if(ItemId_GetFieldFunc(itemId) == ItemUseOutOfBattle_TMHM)
+		return 1;
+	else if(ItemId_GetFieldFunc(itemId) == ItemUseOutOfBattle_EvolutionStone)
+		return 2;
+	else
+		return 0;
+}
+
+void sub_80C9154(u8 taskId)
+{
+	struct MailStruct mailStruct;
+
+	if(!gPaletteFade.active)
+	{
+		mailStruct.var20 = gScriptItemId;
+		sub_80F890C(&mailStruct, sub_80A5D04, 0);
+		DestroyTask(taskId);
+	}
+}
+
+void ItemUseOutOfBattle_Mail(u8 taskId)
+{
+	BeginNormalPaletteFade(0xFFFFFFFF, 0, 0, 16, 0);
+	gTasks[taskId].func = sub_80C9154;
+}
+
+void ItemUseOutOfBattle_Bike(u8 taskId)
+{
+	s16 x, y;
+	u8 tileBehavior;
+	
+	PlayerGetDestCoords(&x, &y);
+	tileBehavior = MapGridGetMetatileBehaviorAt(x, y);
+	
+	if(FlagGet(0x82B) == TRUE
+		|| MetatileBehavior_IsVerticalRail(tileBehavior) == TRUE
+		|| MetatileBehavior_IsHorizontalRail(tileBehavior) == TRUE
+		|| MetatileBehavior_IsIsolatedVerticalRail(tileBehavior) == TRUE
+		|| MetatileBehavior_IsIsolatedHorizontalRail(tileBehavior) == TRUE)
+	{
+		sub_80C9104(taskId, gTasks[taskId].data[2]);
+	}
+	else
+	{
+		if(sub_8053C44() == TRUE && sub_80E5EF4() == FALSE)
+		{
+			gUnknown_03005D00 = (void *)ItemUseOnFieldCB_Bike;
+			SetUpItemUseOnFieldCallback(taskId);
+		}
+		else
+			DisplayDadsAdviceCannotUseItemMessage(taskId, gTasks[taskId].data[2]);
+	}
+}
+
+void ItemUseOnFieldCB_Bike(u8 taskId)
+{
+	if(ItemId_GetSecondaryId(gScriptItemId) == 0)
+		GetOnOffBike(2);
+	if(ItemId_GetSecondaryId(gScriptItemId) == 1)
+		GetOnOffBike(4);
+	
+	sub_8064E2C();
+	ScriptContext2_Disable();
+	DestroyTask(taskId);
+}
+
+bool32 CanFish(void)
+{
+    s16 x, y;
+    u16 tileBehavior;
+
+    GetXYCoordsOneStepInFrontOfPlayer(&x, &y);
+    tileBehavior = MapGridGetMetatileBehaviorAt(x, y);
+
+    if (MetatileBehavior_IsWaterfall(tileBehavior))
+        return FALSE;
+
+    if (TestPlayerAvatarFlags(PLAYER_AVATAR_FLAG_4))
+        return FALSE;
+
+    if (!TestPlayerAvatarFlags(PLAYER_AVATAR_FLAG_SURFING))
+    {
+        if (IsPlayerFacingSurfableFishableWater())
+            return TRUE;
+    }
+    else
+    {
+        if (MetatileBehavior_IsSurfableWaterOrUnderwater(tileBehavior) && !MapGridIsImpassableAt(x, y))
+            return TRUE;
+        if (MetatileBehavior_IsBridge(tileBehavior) == TRUE)
+            return TRUE;
+    }
+
+    return FALSE;
+}
+
+void ItemUseOutOfBattle_Rod(u8 taskId)
+{
+	if(CanFish() == TRUE)
+	{
+		gUnknown_03005D00 = (void *)ItemUseOnFieldCB_Rod;
+		SetUpItemUseOnFieldCallback(taskId);
+	}
+	else
+		DisplayDadsAdviceCannotUseItemMessage(taskId, gTasks[taskId].data[2]);
+}
+
+void ItemUseOnFieldCB_Rod(u8 taskId)
+{
+	StartFishing(ItemId_GetSecondaryId(gScriptItemId));
+	DestroyTask(taskId);
+}
+
+void ItemUseOutOfBattle_Itemfinder(u8 var)
+{
+	sav12_xor_increment(0x27);
+	gUnknown_03005D00 = (void *)ItemUseOnFieldCB_Itemfinder;
+	SetUpItemUseOnFieldCallback(var);
+}
+
+void ItemUseOnFieldCB_Itemfinder(u8 taskId)
+{
+    if(ItemfinderCheckForHiddenItems(gMapHeader.events, taskId) == TRUE)
+        gTasks[taskId].func = sub_80C9458;
+    else
+        DisplayItemMessageOnField(taskId, gOtherText_NoResponse, sub_80C9520, 0);
+}
+
+void sub_80C9458(u8 taskId)
+{
+    u8 var;
+    u8 playerDir;
+    u8 i;
+    s16 *data = gTasks[taskId].data;
+
+    if(!data[3])
+    {
+        if(data[4] == 4)
+        {
+            var = sub_80C9908(data[0], data[1]);
+            if(var)
+            {
+                sub_80C997C(gUnknown_083D61F0[var - 1]);
+                gTasks[taskId].func = sub_80C99EC;
+            }
+            else
+            {
+                playerDir = player_get_direction_lower_nybble();
+
+                for (i = 0; i < 4; i++)
+                    if (playerDir == gUnknown_083D61F0[i])
+                        data[5] = (i + 1) & 3;
+
+                gTasks[taskId].func = sub_80C9A38;
+                data[3] = 0;
+                data[2] = 0;
+            }
+			return;
+        }
+        PlaySE(0x48);
+        data[4]++;
+    }
+    data[3] = (data[3] + 1) & 0x1F;
+}
+
+void sub_80C9520(u8 taskId)
+{
+	MenuZeroFillWindowRect(0, 14, 29, 19);
+	sub_8064E2C();
+	ScriptContext2_Disable();
+	DestroyTask(taskId);
+}
+
+// too much struct math.
+__attribute__((naked))
+bool8 ItemfinderCheckForHiddenItems(struct MapEvents *events, int var)
+{
+	asm(".syntax unified\n\
+	push {r4-r7,lr}\n\
+	mov r7, r9\n\
+	mov r6, r8\n\
+	push {r6,r7}\n\
+	sub sp, 0x4\n\
+	adds r5, r0, 0\n\
+	lsls r1, 24\n\
+	lsrs r6, r1, 24\n\
+	mov r4, sp\n\
+	adds r4, 0x2\n\
+	mov r0, sp\n\
+	adds r1, r4, 0\n\
+	bl PlayerGetDestCoords\n\
+	ldr r1, _080C9618 @ =gTasks\n\
+	lsls r0, r6, 2\n\
+	adds r0, r6\n\
+	lsls r0, 3\n\
+	adds r0, r1\n\
+	movs r1, 0\n\
+	strh r1, [r0, 0xC]\n\
+	movs r3, 0\n\
+	mov r9, r4\n\
+	ldrb r0, [r5, 0x3]\n\
+	cmp r3, r0\n\
+	bge _080C95FC\n\
+	subs r1, 0x5\n\
+	mov r8, r1\n\
+_080C9580:\n\
+	lsls r3, 16\n\
+	asrs r1, r3, 16\n\
+	ldr r2, [r5, 0x10]\n\
+	lsls r0, r1, 1\n\
+	adds r0, r1\n\
+	lsls r4, r0, 2\n\
+	adds r1, r4, r2\n\
+	ldrb r0, [r1, 0x5]\n\
+	adds r7, r3, 0\n\
+	cmp r0, 0x7\n\
+	bne _080C95EC\n\
+	movs r2, 0x96\n\
+	lsls r2, 2\n\
+	adds r0, r2, 0\n\
+	ldrh r1, [r1, 0xA]\n\
+	adds r0, r1\n\
+	lsls r0, 16\n\
+	lsrs r0, 16\n\
+	bl FlagGet\n\
+	lsls r0, 24\n\
+	cmp r0, 0\n\
+	bne _080C95EC\n\
+	ldr r1, [r5, 0x10]\n\
+	adds r1, r4, r1\n\
+	ldrh r2, [r1]\n\
+	adds r2, 0x7\n\
+	mov r0, sp\n\
+	ldrh r0, [r0]\n\
+	subs r2, r0\n\
+	ldrh r0, [r1, 0x2]\n\
+	adds r0, 0x7\n\
+	mov r3, r9\n\
+	ldrh r1, [r3]\n\
+	subs r0, r1\n\
+	lsls r0, 16\n\
+	lsrs r0, 16\n\
+	lsls r2, 16\n\
+	asrs r1, r2, 16\n\
+	movs r3, 0xE0\n\
+	lsls r3, 11\n\
+	adds r2, r3\n\
+	lsrs r2, 16\n\
+	cmp r2, 0xE\n\
+	bhi _080C95EC\n\
+	lsls r0, 16\n\
+	asrs r2, r0, 16\n\
+	cmp r2, r8\n\
+	blt _080C95EC\n\
+	cmp r2, 0x5\n\
+	bgt _080C95EC\n\
+	adds r0, r6, 0\n\
+	bl sub_80C9838\n\
+_080C95EC:\n\
+	movs r1, 0x80\n\
+	lsls r1, 9\n\
+	adds r0, r7, r1\n\
+	lsrs r3, r0, 16\n\
+	asrs r0, 16\n\
+	ldrb r2, [r5, 0x3]\n\
+	cmp r0, r2\n\
+	blt _080C9580\n\
+_080C95FC:\n\
+	adds r0, r6, 0\n\
+	bl sub_80C9720\n\
+	ldr r0, _080C9618 @ =gTasks\n\
+	lsls r1, r6, 2\n\
+	adds r1, r6\n\
+	lsls r1, 3\n\
+	adds r1, r0\n\
+	movs r3, 0xC\n\
+	ldrsh r0, [r1, r3]\n\
+	cmp r0, 0x1\n\
+	beq _080C961C\n\
+	movs r0, 0\n\
+	b _080C961E\n\
+	.align 2, 0\n\
+_080C9618: .4byte gTasks\n\
+_080C961C:\n\
+	movs r0, 0x1\n\
+_080C961E:\n\
+	add sp, 0x4\n\
+	pop {r3,r4}\n\
+	mov r8, r3\n\
+	mov r9, r4\n\
+	pop {r4-r7}\n\
+	pop {r1}\n\
+	bx r1\n\
+	.syntax divided");
+}