| 1 | ; Project name : Assembly Library
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| 2 | ; Description : Functions for managing keyboard.
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| 3 |
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| 4 | BUFFER_SIZE_FOR_WORD_INPUT EQU 6 ; 5 chars + NULL
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| 5 |
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| 6 | ; Section containing code
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| 7 | SECTION .text
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| 8 |
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| 9 | ;--------------------------------------------------------------------
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| 10 | ; Reads user inputted word.
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| 11 | ; Function returns when ENTER or ESC will be pressed.
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| 12 | ;
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| 13 | ; Keyboard_ReadUserInputtedWordWhilePrinting
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| 14 | ; Parameters
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| 15 | ; BX: Numeric base (10 or 16)
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| 16 | ; Returns:
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| 17 | ; AX: User inputted word
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| 18 | ; ZF: Set if user cancellation
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| 19 | ; Corrupts registers:
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| 20 | ; DX
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| 21 | ;--------------------------------------------------------------------
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| 22 | ALIGN JUMP_ALIGN
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| 23 | Keyboard_ReadUserInputtedWordWhilePrinting:
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| 24 | push ds
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| 25 | push si
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| 26 | push cx
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| 27 |
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| 28 | mov cx, BUFFER_SIZE_FOR_WORD_INPUT
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| 29 | call Memory_ReserveCXbytesFromStackToDSSI
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| 30 |
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| 31 | call Char_GetFilterFunctionToDXforNumericBaseInBX
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| 32 | call Registers_ExchangeDSSIwithESDI
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| 33 | call Keyboard_ReadUserInputtedStringToESDIWhilePrinting
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| 34 | call Registers_ExchangeDSSIwithESDI ; Does not modify FLAGS
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| 35 | jz SHORT .CancelledByUser
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| 36 |
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| 37 | call String_ConvertWordToAXfromStringInDSSIwithBaseInBX
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| 38 | .CancelledByUser:
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| 39 | add sp, BYTE BUFFER_SIZE_FOR_WORD_INPUT
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| 40 | test cx, cx ; Set ZF if string length is zero
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| 41 | pop cx
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| 42 | pop si
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| 43 | pop ds
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| 44 | ret
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| 45 |
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| 46 |
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| 47 | ;--------------------------------------------------------------------
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| 48 | ; Reads user inputted string to buffer. Character filter is
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| 49 | ; supported to ignore unwanted characters.
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| 50 | ; Function returns when ENTER or ESC will be pressed.
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| 51 | ;
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| 52 | ; Keyboard_ReadUserInputtedStringToESDIWhilePrinting
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| 53 | ; Parameters:
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| 54 | ; CX: Buffer size (with NULL)
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| 55 | ; ES:DI: Ptr to destination buffer
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| 56 | ; CS:DX: Ptr to character filter function:
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| 57 | ; Parameters:
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| 58 | ; AL: Character inputted by user
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| 59 | ; Returns:
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| 60 | ; CF: Set if character is accepted
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| 61 | ; Cleared if character is rejected
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| 62 | ; Corrupts registers:
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| 63 | ; Nothing
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| 64 | ; Returns:
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| 65 | ; CX: String length in characters (without NULL)
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| 66 | ; ZF: Set if user cancellation
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| 67 | ; Corrupts registers:
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| 68 | ; AX
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| 69 | ;--------------------------------------------------------------------
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| 70 | ALIGN JUMP_ALIGN
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| 71 | Keyboard_ReadUserInputtedStringToESDIWhilePrinting:
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| 72 | push di
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| 73 | push si
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| 74 | push bx
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| 75 | call .PrepareDisplayContextForKeyboardInput
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| 76 | jcxz .ReturnAfterUpdatingZF
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| 77 |
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| 78 | xor bx, bx ; Zero character counter
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| 79 | dec cx ; Decrement buffer size for NULL
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| 80 | cld
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| 81 | ALIGN JUMP_ALIGN
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| 82 | .GetCharacterFromUser:
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| 83 | call Keyboard_GetKeystrokeToAXandWaitIfNecessary ; Get ASCII to AL
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| 84 | call .ProcessControlCharacter
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| 85 | jz SHORT .TerminateStringWithNULL
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| 86 | jc SHORT .PlayBellForRejectedCharacter
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| 87 | call dx ; Filter character
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| 88 | jnc SHORT .PlayBellForRejectedCharacter
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| 89 | inc bx ; Increment number of characters stored
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| 90 | stosb ; Store from AL to ES:DI
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| 91 | call Keyboard_PrintInputtedCharacter
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| 92 | loop .GetCharacterFromUser
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| 93 | .PlayBellForRejectedCharacter:
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| 94 | cmp al, BS ; No bell for backspace
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| 95 | je SHORT .GetCharacterFromUser
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| 96 | call Keyboard_PlayBellForUnwantedKeystroke
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| 97 | jmp SHORT .GetCharacterFromUser
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| 98 |
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| 99 | .TerminateStringWithNULL:
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| 100 | stosb ; Terminate string with NULL
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| 101 | mov cx, bx ; String length now in CX
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| 102 |
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| 103 | .ReturnAfterUpdatingZF:
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| 104 | CALL_DISPLAY_LIBRARY PopDisplayContext
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| 105 | test cx, cx ; Clear or set ZF
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| 106 | pop bx
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| 107 | pop si
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| 108 | pop di
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| 109 | ret
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| 110 |
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| 111 | ;--------------------------------------------------------------------
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| 112 | ; .PrepareDisplayContextForKeyboardInput
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| 113 | ; Parameters:
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| 114 | ; Nothing
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| 115 | ; Returns:
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| 116 | ; Nothing (Display context pushed to stack)
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| 117 | ; Corrupts registers:
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| 118 | ; AX, BX, SI
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| 119 | ;--------------------------------------------------------------------
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| 120 | ALIGN JUMP_ALIGN
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| 121 | .PrepareDisplayContextForKeyboardInput:
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| 122 | pop bx ; Pop return address to BX
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| 123 | mov si, di
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| 124 |
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| 125 | CALL_DISPLAY_LIBRARY PushDisplayContext
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| 126 | mov ax, CURSOR_NORMAL
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| 127 | CALL_DISPLAY_LIBRARY SetCursorShapeFromAX
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| 128 | CALL_DISPLAY_LIBRARY SynchronizeDisplayContextToHardware
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| 129 |
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| 130 | mov di, si
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| 131 | jmp bx
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| 132 |
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| 133 |
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| 134 | ;--------------------------------------------------------------------
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| 135 | ; .ProcessControlCharacter
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| 136 | ; Parameters:
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| 137 | ; AL: Character inputted by user
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| 138 | ; CX: Number of bytes left in buffer
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| 139 | ; BX: Total number of characters inputted
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| 140 | ; ES:DI: Ptr where to store next character
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| 141 | ; Returns:
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| 142 | ; AL: Character inputted by user or NULL if end of input
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| 143 | ; BX: Cleared if user cancellation
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| 144 | ; ZF: Set if user has ended or cancelled key input
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| 145 | ; CF: Set if character is rejected
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| 146 | ; Corrupts registers:
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| 147 | ; AH
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| 148 | ;--------------------------------------------------------------------
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| 149 | ALIGN JUMP_ALIGN
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| 150 | .ProcessControlCharacter:
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| 151 | cmp al, CR ; ENTER to terminate string?
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| 152 | je SHORT .EndCharacterInput
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| 153 | cmp al, ESC ; Cancel input?
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| 154 | je SHORT .CancelCharacterInput
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| 155 | cmp al, BS ; Backspace?
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| 156 | je SHORT .Backspace
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| 157 | jcxz .RejectCharacter
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| 158 | test al, al ; Clear ZF and CF
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| 159 | ret
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| 160 |
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| 161 | .Backspace:
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| 162 | test bx, bx ; At the beginning?
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| 163 | jz SHORT .RejectCharacter
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| 164 | inc cx ; Increment bytes left
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| 165 | dec bx ; Decrement characters inputted
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| 166 | dec di
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| 167 | call Keyboard_PrintBackspace
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| 168 | mov al, BS ; Restore character
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| 169 | .RejectCharacter:
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| 170 | test al, al ; Clear ZF...
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| 171 | stc ; ...and set CF
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| 172 | ret
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| 173 |
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| 174 | .CancelCharacterInput:
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| 175 | xor bx, bx
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| 176 | .EndCharacterInput:
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| 177 | xor al, al ; Set ZF and clear CF
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| 178 | ret
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| 179 |
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| 180 |
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| 181 | ;--------------------------------------------------------------------
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| 182 | ; Keyboard_PrintBackspace
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| 183 | ; Parameters:
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| 184 | ; Nothing
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| 185 | ; Returns:
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| 186 | ; Nothing
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| 187 | ; Corrupts registers:
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| 188 | ; AX
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| 189 | ;--------------------------------------------------------------------
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| 190 | ALIGN JUMP_ALIGN
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| 191 | Keyboard_PrintBackspace:
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| 192 | mov al, BS
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| 193 | call Keyboard_PrintInputtedCharacter
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| 194 | mov al, ' '
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| 195 | call Keyboard_PrintInputtedCharacter
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| 196 | mov al, BS
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| 197 | jmp SHORT Keyboard_PrintInputtedCharacter
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| 198 |
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| 199 |
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| 200 | ;--------------------------------------------------------------------
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| 201 | ; Keyboard_PlayBellForUnwantedKeystroke
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| 202 | ; Parameters:
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| 203 | ; Nothing
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| 204 | ; Returns:
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| 205 | ; Nothing
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| 206 | ; Corrupts registers:
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| 207 | ; AX
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| 208 | ;--------------------------------------------------------------------
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| 209 | ALIGN JUMP_ALIGN
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| 210 | Keyboard_PlayBellForUnwantedKeystroke:
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| 211 | mov al, BELL
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| 212 | ; Fall to Keyboard_PrintInputtedCharacter
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| 213 |
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| 214 | ;--------------------------------------------------------------------
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| 215 | ; Keyboard_PrintInputtedCharacter
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| 216 | ; Parameters:
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| 217 | ; AL: Character inputted by user
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| 218 | ; Returns:
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| 219 | ; Nothing
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| 220 | ; Corrupts registers:
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| 221 | ; AX
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| 222 | ;--------------------------------------------------------------------
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| 223 | ALIGN JUMP_ALIGN
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| 224 | Keyboard_PrintInputtedCharacter:
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| 225 | push di
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| 226 | CALL_DISPLAY_LIBRARY PrintCharacterFromAL
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| 227 | CALL_DISPLAY_LIBRARY SynchronizeDisplayContextToHardware ; Hardware cursor
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| 228 | pop di
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| 229 | ret
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| 230 |
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| 231 |
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| 232 | ;--------------------------------------------------------------------
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| 233 | ; Keyboard_RemoveAllKeystrokesFromBuffer
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| 234 | ; Parameters:
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| 235 | ; Nothing
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| 236 | ; Returns:
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| 237 | ; Nothing
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| 238 | ; Corrupts registers:
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| 239 | ; AX
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| 240 | ;--------------------------------------------------------------------
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| 241 | ALIGN JUMP_ALIGN
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| 242 | Keyboard_RemoveAllKeystrokesFromBuffer:
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| 243 | call Keyboard_GetKeystrokeToAX
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| 244 | jnz SHORT Keyboard_RemoveAllKeystrokesFromBuffer
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| 245 | ret
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| 246 |
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| 247 |
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| 248 | ;--------------------------------------------------------------------
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| 249 | ; Keyboard_GetKeystrokeToAX
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| 250 | ; Keyboard_GetKeystrokeToAXandLeaveItToBuffer
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| 251 | ; Keyboard_GetKeystrokeToAXandWaitIfNecessary
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| 252 | ; Parameters:
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| 253 | ; Nothing
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| 254 | ; Returns:
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| 255 | ; AL: ASCII character (if keystroke available)
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| 256 | ; AH: BIOS scan code (if keystroke available)
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| 257 | ; ZF: Set if no keystroke available
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| 258 | ; Cleared if keystroke available
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| 259 | ; Corrupts registers:
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| 260 | ; Nothing
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| 261 | ;--------------------------------------------------------------------
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| 262 | ALIGN JUMP_ALIGN
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| 263 | Keyboard_GetKeystrokeToAX:
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| 264 | call Keyboard_GetKeystrokeToAXandLeaveItToBuffer
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| 265 | jnz SHORT Keyboard_GetKeystrokeToAXandWaitIfNecessary
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| 266 | ret
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| 267 | ALIGN JUMP_ALIGN
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| 268 | Keyboard_GetKeystrokeToAXandLeaveItToBuffer:
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| 269 | mov ah, CHECK_FOR_KEYSTROKE
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| 270 | int BIOS_KEYBOARD_INTERRUPT_16h
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| 271 | ret
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| 272 | ALIGN JUMP_ALIGN
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| 273 | Keyboard_GetKeystrokeToAXandWaitIfNecessary:
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| 274 | xor ah, ah ; GET_KEYSTROKE
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| 275 | int BIOS_KEYBOARD_INTERRUPT_16h
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| 276 | test ax, ax ; Clear ZF
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| 277 | ret
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