8 files changed, 56 insertions, 45 deletions
diff --git a/src/constants/name_constants.asm b/src/constants/name_constants.asm
index b16df80..7d4370c 100644
--- a/src/constants/name_constants.asm
+++ b/src/constants/name_constants.asm
@@ -1,3 +1,6 @@
-PLAYER_NAME_LENGTH EQU $10
+NAME_BUFFER_LENGTH          EQU 16
 
-NAMING_SCREEN_BUFFER_LENGTH EQU $18
-\ No newline at end of file
+MAX_PLAYER_NAME_LENGTH      EQU 6   * 2
+MAX_DECK_NAME_LENGTH        EQU 20  * 1 ; note that its unit is byte!
+
+NAMING_SCREEN_BUFFER_LENGTH EQU 24
+\ No newline at end of file
diff --git a/src/engine/bank01.asm b/src/engine/bank01.asm
index 46337fb..3e295c0 100644
--- a/src/engine/bank01.asm
+++ b/src/engine/bank01.asm
@@ -6112,7 +6112,7 @@ DuelDataToSave: ; 6729 (1:6729)
 ;	dw address, number_of_bytes_to_copy
 	dw wPlayerDuelVariables, wOpponentDuelVariables - wPlayerDuelVariables
 	dw wOpponentDuelVariables, wPlayerDeck - wOpponentDuelVariables
-	dw wPlayerDeck, wc500 + $10 - wPlayerDeck
+	dw wPlayerDeck, wNameBuffer + $10 - wPlayerDeck
 	dw wWhoseTurn, wDuelTheme + $1 - wWhoseTurn
 	dw hWhoseTurn, $1
 	dw wRNG1, wRNGCounter + $1 - wRNG1
diff --git a/src/engine/bank02.asm b/src/engine/bank02.asm
index c58895c..232fa98 100644
--- a/src/engine/bank02.asm
+++ b/src/engine/bank02.asm
@@ -254,6 +254,7 @@ Func_8f05: ; 8f05 (2:4f05)
 	ld a, [wceb1]
 	or a
 	jr nz, .asm_8f10
+	; it refers to a data in the other bank without any bank desc.
 	ld hl, Deck1Data
 	jr .asm_8f23
 .asm_8f10
@@ -269,8 +270,8 @@ Func_8f05: ; 8f05 (2:4f05)
 .asm_8f20
 	ld hl, Deck4Data
 .asm_8f23
-	ld a, $14
-	ld bc, $0401
+	ld a, MAX_DECK_NAME_LENGTH
+	lb bc, 4, 1
 	ld de, wcfb9
 	farcall InputDeckName
 	ld a, [wcfb9]
diff --git a/src/engine/bank04.asm b/src/engine/bank04.asm
index d9645a5..96a3c4b 100644
--- a/src/engine/bank04.asm
+++ b/src/engine/bank04.asm
@@ -1182,20 +1182,20 @@ Func_1288c: ; 1288c (4:688c)
 
 DisplayPlayerNamingScreen:: ; 128a9 (4:68a9)
 	; clear the name buffer.
-	ld hl, wc500 ; c500: name buffer.
-	ld bc, PLAYER_NAME_LENGTH
+	ld hl, wNameBuffer ; c500: name buffer.
+	ld bc, NAME_BUFFER_LENGTH
 	ld a, TX_END
 	call FillMemoryWithA
 
 	; get player's name
 	; from the user into hl.
-	ld hl, wc500
+	ld hl, wNameBuffer
 	farcall InputPlayerName
 	
 	farcall Func_c1a4
 	call DoFrameIfLCDEnabled
 	call DisableLCD
-	ld hl, wc500
+	ld hl, wNameBuffer
 	; get the first byte of the name buffer.
 	ld a, [hl]
 	or a
@@ -1205,7 +1205,7 @@ DisplayPlayerNamingScreen:: ; 128a9 (4:68a9)
 .no_name
 	; set the default name.
 	ld de, sPlayerName
-	ld bc, PLAYER_NAME_LENGTH
+	ld bc, NAME_BUFFER_LENGTH
 	call EnableSRAM
 	call CopyDataHLtoDE_SaveRegisters
 	; it seems for integrity checking.
diff --git a/src/engine/bank06.asm b/src/engine/bank06.asm
index c092d16..987958f 100644
--- a/src/engine/bank06.asm
+++ b/src/engine/bank06.asm
@@ -731,7 +731,7 @@ Func_006_4598: ; 18598 (6:4598)
 .asm_006_45f7
 	call DoFrame
 	ldh a, [hKeysPressed]
-	and $02
+	and B_BUTTON
 	jr z, .asm_006_45f7
 	ld a, $ff
 	farcall Func_90fb
@@ -1532,9 +1532,9 @@ PlaySFXByA: ; (6:6794)
 InputPlayerName: ; (6:67a3)
 	ld e, l
 	ld d, h
-	ld a, $0c
+	ld a, MAX_PLAYER_NAME_LENGTH
 	ld hl, WhatIsYourNameData
-	lb bc, $0c, $01
+	lb bc, 12, 1
 	call InitializeInputName
 	call Set_OBJ_8x8
 	xor a
@@ -1573,9 +1573,9 @@ InputPlayerName: ; (6:67a3)
 	ld a, $01
 	call PlaySFXByA
 	call Func_006_6a07
-	ld a, $06
+	ld a, 6
 	ld [wNamingScreenCursorX], a
-	ld a, $05
+	ld a, 5
 	ld [wNamingScreenCursorY], a
 	call Func_006_6a23
 	jr .loop
@@ -1597,12 +1597,12 @@ InputPlayerName: ; (6:67a3)
 	jr z, .loop ; empty string?
 	; erase one character.
 	ld e, a
-	ld d, $00
+	ld d, 0
 	ld hl, wNamingScreenBuffer
 	add hl, de
 	dec hl
 	dec hl
-	ld [hl], $00
+	ld [hl], TX_END
 	ld hl, wNamingScreenBufferLength ; note that its unit is byte, not word.
 	dec [hl]
 	dec [hl]
@@ -1611,12 +1611,13 @@ InputPlayerName: ; (6:67a3)
 	
 ; it's called when naming(either player's or deck's) starts.
 ; a: maximum length of name(depending on whether player's or deck's).
+; bc: position of name.
 ; de: dest. pointer.
 ; hl: pointer to text item of the question.
 InitializeInputName:
 	ld [wNamingScreenBufferMaxLength], a
 	push hl
-	ld hl, wd007
+	ld hl, wNamingScreenNamePosition
 	ld [hl], b
 	inc hl
 	ld [hl], c
@@ -1634,7 +1635,7 @@ InitializeInputName:
 	inc hl
 	ld [hl], d
 	; clear the name buffer.
-	ld a, $18
+	ld a, NAMING_SCREEN_BUFFER_LENGTH
 	ld hl, wNamingScreenBuffer
 	call ClearMemory
 	ld hl, wNamingScreenBuffer
@@ -1699,13 +1700,13 @@ DrawNamingScreenBG:
 	db $ff
 
 DrawTextboxForKeyboard:
-	ld de, $0003 ; x, y
-	ld bc, $140f ; w, h
+	lb de, 0, 3 ; x, y
+	lb bc, 20, 15 ; w, h
 	call DrawRegularTextBox
 	ret
 
 PrintPlayerNameFromInput:
-	ld hl, wd007
+	ld hl, wNamingScreenNamePosition
 	ld d, [hl]
 	inc hl
 	ld e, [hl]
@@ -1965,7 +1966,7 @@ Func_006_6a28:
 	jr nz, .asm_006_6a49
 	dec a
 .asm_006_6a49
-	ld hl, wd007
+	ld hl, wNamingScreenNamePosition
 	add [hl]
 	ld d, a
 	ld h, $08
@@ -2329,20 +2330,24 @@ KeyboardData: ; (6:6baf)
 	kbitem $54, $00, $50, $0e, $0055
 	kbitem $51, $0e, $56, $00, $0000
 
-; get deck name from the user
-; into de.
+; get deck name from the user into de.
+; function description is similar to the player's.
+; refer to 'InputPlayerName'.
 InputDeckName: ; 1ad89 (6:6d89)
 	push af
+	; check if the buffer is empty.
 	ld a, [de]
 	or a
-	jr nz, .asm_006_6d91
-	ld a, $06
+	jr nz, .not_empty
+	; this buffer will contain half-width chars.
+	ld a, TX_HALFWIDTH
 	ld [de], a
-.asm_006_6d91
+.not_empty
 	pop af
 	inc a
 	call InitializeInputName
 	call Set_OBJ_8x8
+
 	xor a
 	ld [wTileMapFill], a
 	call EmptyScreen
@@ -2367,7 +2372,7 @@ InputDeckName: ; 1ad89 (6:6d89)
 	ld [wceaa], a
 	ld a, $00
 	ld [wceab], a
-.asm_006_6dd6
+.loop
 	ld a, $01
 	ld [wVBlankOAMCopyToggle], a
 	call DoFrame
@@ -2378,18 +2383,18 @@ InputDeckName: ; 1ad89 (6:6d89)
 	ld a, $01
 	call PlaySFXByA
 	call Func_006_6fa1
-	ld a, $06
+	ld a, 6
 	ld [wNamingScreenCursorX], a
 	ld [wNamingScreenCursorY], a
 	call Func_006_6fbd
-	jr .asm_006_6dd6
+	jr .loop
 .on_start
 	call Func_006_6efb
-	jr nc, .asm_006_6dd6
+	jr nc, .loop
 	cp $ff
 	jr z, .asm_006_6e1c
 	call Func_006_6ec3
-	jr nc, .asm_006_6dd6
+	jr nc, .loop
 	call FinalizeInputName
 	ld hl, wNamingScreenDestPointer
 	ld a, [hli]
@@ -2400,23 +2405,23 @@ InputDeckName: ; 1ad89 (6:6d89)
 	or a
 	jr nz, .asm_006_6e1b
 	dec hl
-	ld [hl], $00
+	ld [hl], TX_END
 .asm_006_6e1b
 	ret
 .asm_006_6e1c
 	ld a, [wNamingScreenBufferLength]
 	cp $02
-	jr c, .asm_006_6dd6
+	jr c, .loop
 	ld e, a
-	ld d, $00
+	ld d, 0
 	ld hl, wNamingScreenBuffer
 	add hl, de
 	dec hl
-	ld [hl], $00
+	ld [hl], TX_END
 	ld hl, wNamingScreenBufferLength
 	dec [hl]
 	call ProcessTextWithUnderbar
-	jp .asm_006_6dd6
+	jp .loop
 
 ; fill v0Tiles0 for 0x10 tiles
 ; with 0xF0.
@@ -2439,7 +2444,7 @@ rept $10
 endr
 
 ProcessTextWithUnderbar:
-	ld hl, wd007
+	ld hl, wNamingScreenNamePosition
 	ld d, [hl]
 	inc hl
 	ld e, [hl]
@@ -2688,7 +2693,7 @@ Func_006_6fc2:
 .asm_006_6fdf
 	dec a
 	ld d, a
-	ld hl, wd007
+	ld hl, wNamingScreenNamePosition
 	ld a, [hl]
 	sla a
 	add d
diff --git a/src/engine/home.asm b/src/engine/home.asm
index 72aedcf..cab683d 100644
--- a/src/engine/home.asm
+++ b/src/engine/home.asm
@@ -5351,7 +5351,7 @@ CopyOpponentName: ; 1c8e (0:1c8e)
 	ld h, a
 	jp CopyText
 .special_name
-	ld hl, wc500
+	ld hl, wNameBuffer
 	ld a, [hl]
 	or a
 	jr z, .print_player2
diff --git a/src/sram.asm b/src/sram.asm
index c69e4c0..272fbfd 100644
--- a/src/sram.asm
+++ b/src/sram.asm
@@ -25,7 +25,7 @@ s0a00c:: ; a00c
 	ds $4
 
 sPlayerName:: ; a010
-	ds $10
+	ds NAME_BUFFER_LENGTH
 
 	ds $e0
 
diff --git a/src/wram.asm b/src/wram.asm
index e34f4c3..3af5361 100644
--- a/src/wram.asm
+++ b/src/wram.asm
@@ -363,8 +363,9 @@ ENDU
 wOpponentDeck:: ; c480
 	ds $80
 
-wc500:: ; c500
-	ds $10
+; this holds names like player's or opponent's.
+wNameBuffer:: ; c500
+	ds NAME_BUFFER_LENGTH
 
 ; this holds an $ff-terminated list of card deck indexes (e.g. cards in hand or in bench)
 ; or (less often) the attack list of a Pokemon card
@@ -1499,7 +1500,8 @@ wd005:: ; d005
 wNamingScreenCursorX:: ; d006
 	ds $1
 
-wd007:: ; d007
+; the position to display the input on.
+wNamingScreenNamePosition:: ; d007
 	ds $2
 
 wd009:: ; d009