| 1 | ; Project name : Assembly Library
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| 2 | ; Description : Functions for display output.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; Supports following formatting types:
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| 9 | ; %a Specifies attribute for next character
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| 10 | ; %A Specifies attribute for remaining string (or until next %A)
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| 11 | ; %d Prints signed 16-bit decimal integer
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| 12 | ; %u Prints unsigned 16-bit decimal integer
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| 13 | ; %x Prints 16-bit hexadecimal integer
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| 14 | ; %s Prints string (from CS segment)
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| 15 | ; %S Prints string (far pointer)
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| 16 | ; %c Prints character
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| 17 | ; %t Prints character number of times (character needs to be pushed first, then repeat times)
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| 18 | ; %% Prints '%' character (no parameter pushed)
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| 19 | ;
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| 20 | ; Any placeholder can be set to minimum length by specifying
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| 21 | ; minimum number of characters. For example %8d would append spaces
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| 22 | ; after integer so that at least 8 characters would be printed.
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| 23 | ;
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| 24 | ; When placing '-' after number, then spaces will be used for prepending.
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| 25 | ; For example %8-d would prepend integer with spaces so that at least
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| 26 | ; 8 characters would be printed.
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| 27 | ;
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| 28 | ; DisplayPrint_FormattedNullTerminatedStringFromCSSI
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| 29 | ; Parameters:
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| 30 | ; BP: SP before pushing parameters
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| 31 | ; DS: BDA segment (zero)
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| 32 | ; CS:SI: Pointer to string to format
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| 33 | ; ES:DI: Ptr to cursor location in video RAM
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| 34 | ; Stack: Parameters for formatting placeholders.
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| 35 | ; Parameter for first placeholder must be pushed first.
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| 36 | ; Low word must pushed first for placeholders requiring
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| 37 | ; 32-bit parameters (two words).
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| 38 | ; Returns:
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| 39 | ; DI: Updated offset to video RAM
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| 40 | ; Corrupts registers:
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| 41 | ; AX, DX
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| 42 | ;--------------------------------------------------------------------
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| 43 | ALIGN JUMP_ALIGN
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| 44 | DisplayPrint_FormattedNullTerminatedStringFromCSSI:
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| 45 | push bp
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| 46 | push si
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| 47 | push cx
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| 48 | push bx
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| 49 | push WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
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| 50 |
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| 51 | dec bp ; Point BP to...
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| 52 | dec bp ; ...first stack parameter
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| 53 | call DisplayFormat_ParseCharacters
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| 54 |
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| 55 | ; Pop original character attribute
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| 56 | pop ax
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| 57 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
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| 58 |
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| 59 | pop bx
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| 60 | pop cx
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| 61 | pop si
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| 62 | pop bp
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| 63 | ret
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| 64 |
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| 65 |
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| 66 | ;--------------------------------------------------------------------
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| 67 | ; DisplayPrint_SignedWordFromAXWithBaseInBX
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| 68 | ; Parameters:
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| 69 | ; AX: Word to display
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| 70 | ; BX: Integer base (binary=2, octal=8, decimal=10, hexadecimal=16)
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| 71 | ; DS: BDA segment (zero)
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| 72 | ; ES:DI: Ptr to cursor location in video RAM
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| 73 | ; Returns:
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| 74 | ; DI: Updated offset to video RAM
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| 75 | ; Corrupts registers:
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| 76 | ; AX, DX
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| 77 | ;--------------------------------------------------------------------
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| 78 | ALIGN JUMP_ALIGN
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| 79 | DisplayPrint_SignedWordFromAXWithBaseInBX:
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| 80 | test ax, ax
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| 81 | jns SHORT DisplayPrint_WordFromAXWithBaseInBX
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| 82 |
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| 83 | push ax
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| 84 | mov al, '-'
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| 85 | call DisplayPrint_CharacterFromAL
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| 86 | pop ax
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| 87 | neg ax
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| 88 | ; Fall to DisplayPrint_WordFromAXWithBaseInBX
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| 89 |
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| 90 | ;--------------------------------------------------------------------
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| 91 | ; DisplayPrint_WordFromAXWithBaseInBX
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| 92 | ; Parameters:
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| 93 | ; AX: Word to display
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| 94 | ; BX: Integer base (binary=2, octal=8, decimal=10, hexadecimal=16)
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| 95 | ; DS: BDA segment (zero)
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| 96 | ; ES:DI: Ptr to cursor location in video RAM
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| 97 | ; Returns:
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| 98 | ; DI: Updated offset to video RAM
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| 99 | ; Corrupts registers:
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| 100 | ; AX, DX
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| 101 | ;--------------------------------------------------------------------
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| 102 | ALIGN JUMP_ALIGN
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| 103 | DisplayPrint_WordFromAXWithBaseInBX:
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| 104 | push cx
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| 105 | push bx
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| 106 |
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| 107 | xor cx, cx
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| 108 | ALIGN JUMP_ALIGN
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| 109 | .DivideLoop:
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| 110 | xor dx, dx ; DX:AX now holds the integer
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| 111 | div bx ; Divide DX:AX by base
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| 112 | push dx ; Push remainder
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| 113 | inc cx ; Increment character count
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| 114 | test ax, ax ; All divided?
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| 115 | jnz SHORT .DivideLoop ; If not, loop
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| 116 |
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| 117 | mov bx, .rgcDigitToCharacter
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| 118 | ALIGN JUMP_ALIGN
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| 119 | .PrintNextDigit:
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| 120 | pop ax ; Pop digit
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| 121 | eSEG cs
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| 122 | xlatb
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| 123 | call DisplayPrint_CharacterFromAL
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| 124 | loop .PrintNextDigit
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| 125 |
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| 126 | pop bx
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| 127 | pop cx
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| 128 | ret
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| 129 | .rgcDigitToCharacter: db "0123456789ABCDEF"
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| 130 |
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| 131 |
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| 132 | ;--------------------------------------------------------------------
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| 133 | ; DisplayPrint_CharacterBufferFromBXSIwithLengthInCX
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| 134 | ; Parameters:
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| 135 | ; CX: Buffer length (characters)
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| 136 | ; BX:SI: Ptr to NULL terminated string
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| 137 | ; DS: BDA segment (zero)
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| 138 | ; ES:DI: Ptr to cursor location in video RAM
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| 139 | ; Returns:
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| 140 | ; DI: Updated offset to video RAM
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| 141 | ; Corrupts registers:
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| 142 | ; AX, DX
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| 143 | ;--------------------------------------------------------------------
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| 144 | ALIGN JUMP_ALIGN
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| 145 | DisplayPrint_CharacterBufferFromBXSIwithLengthInCX:
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| 146 | jcxz .NothingToPrintSinceZeroLength
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| 147 | push si
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| 148 | push cx
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| 149 |
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| 150 | ALIGN JUMP_ALIGN
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| 151 | .PrintNextCharacter:
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| 152 | mov ds, bx
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| 153 | lodsb
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| 154 | LOAD_BDA_SEGMENT_TO ds, dx
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| 155 | call DisplayPrint_CharacterFromAL
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| 156 | loop .PrintNextCharacter
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| 157 |
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| 158 | LOAD_BDA_SEGMENT_TO ds, dx
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| 159 | pop cx
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| 160 | pop si
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| 161 | .NothingToPrintSinceZeroLength:
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| 162 | ret
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| 163 |
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| 164 |
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| 165 | ;--------------------------------------------------------------------
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| 166 | ; DisplayPrint_NullTerminatedStringFromCSSI
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| 167 | ; Parameters:
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| 168 | ; CS:SI: Ptr to NULL terminated string
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| 169 | ; DS: BDA segment (zero)
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| 170 | ; ES:DI: Ptr to cursor location in video RAM
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| 171 | ; Returns:
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| 172 | ; DI: Updated offset to video RAM
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| 173 | ; Corrupts registers:
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| 174 | ; AX, DX
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| 175 | ;--------------------------------------------------------------------
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| 176 | ALIGN JUMP_ALIGN
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| 177 | DisplayPrint_NullTerminatedStringFromCSSI:
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| 178 | push bx
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| 179 | mov bx, cs
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| 180 | call DisplayPrint_NullTerminatedStringFromBXSI
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| 181 | pop bx
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| 182 | ret
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| 183 |
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| 184 |
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| 185 | ;--------------------------------------------------------------------
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| 186 | ; DisplayPrint_NullTerminatedStringFromBXSI
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| 187 | ; Parameters:
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| 188 | ; DS: BDA segment (zero)
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| 189 | ; BX:SI: Ptr to NULL terminated string
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| 190 | ; ES:DI: Ptr to cursor location in video RAM
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| 191 | ; Returns:
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| 192 | ; DI: Updated offset to video RAM
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| 193 | ; Corrupts registers:
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| 194 | ; AX, DX
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| 195 | ;--------------------------------------------------------------------
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| 196 | ALIGN JUMP_ALIGN
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| 197 | DisplayPrint_NullTerminatedStringFromBXSI:
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| 198 | push si
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| 199 | push cx
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| 200 |
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| 201 | xor cx, cx
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| 202 | ALIGN JUMP_ALIGN
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| 203 | .PrintNextCharacter:
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| 204 | mov ds, bx ; String segment to DS
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| 205 | lodsb
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| 206 | mov ds, cx ; BDA segment to DS
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| 207 | test al, al ; NULL?
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| 208 | jz SHORT .EndOfString
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| 209 | call DisplayPrint_CharacterFromAL
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| 210 | jmp SHORT .PrintNextCharacter
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| 211 |
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| 212 | ALIGN JUMP_ALIGN
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| 213 | .EndOfString:
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| 214 | pop cx
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| 215 | pop si
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| 216 | ret
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| 217 |
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| 218 |
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| 219 | ;--------------------------------------------------------------------
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| 220 | ; DisplayPrint_ClearScreenWithCharInALandAttributeInAH
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| 221 | ; Parameters:
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| 222 | ; AL: Character to clear with
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| 223 | ; AH: Attribute to clear with
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| 224 | ; DS: BDA segment (zero)
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| 225 | ; ES:DI: Ptr to cursor location in video RAM
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| 226 | ; Returns:
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| 227 | ; Nothing
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| 228 | ; Corrupts registers:
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| 229 | ; AX, DX
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| 230 | ;--------------------------------------------------------------------
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| 231 | ALIGN JUMP_ALIGN
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| 232 | DisplayPrint_ClearScreenWithCharInALandAttributeInAH:
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| 233 | push di
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| 234 | push cx
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| 235 |
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| 236 | xchg cx, ax
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| 237 | xor ax, ax
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| 238 | call DisplayCursor_SetCoordinatesFromAX ; Updates DI
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| 239 | call DisplayPage_GetColumnsToALandRowsToAH
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| 240 | mul ah ; AX = AL*AH = Characters on screen
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| 241 | xchg cx, ax ; AX = Char+Attr, CX = WORDs to store
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| 242 | rep stosw
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| 243 |
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| 244 | pop cx
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| 245 | pop di
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| 246 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di
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| 247 | ret
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| 248 |
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| 249 |
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| 250 | ;--------------------------------------------------------------------
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| 251 | ; DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
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| 252 | ; Parameters:
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| 253 | ; AH: Area height
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| 254 | ; AL: Area width
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| 255 | ; DS: BDA segment (zero)
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| 256 | ; ES:DI: Ptr to cursor location in video RAM
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| 257 | ; Returns:
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| 258 | ; DI: Updated offset to video RAM
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| 259 | ; Corrupts registers:
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| 260 | ; AX, DX
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| 261 | ;--------------------------------------------------------------------
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| 262 | ALIGN JUMP_ALIGN
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| 263 | DisplayPrint_ClearAreaWithHeightInAHandWidthInAL:
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| 264 | push si
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| 265 | push cx
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| 266 | push bx
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| 267 |
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| 268 | xchg bx, ax ; Area size to BX
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| 269 | call DisplayCursor_GetSoftwareCoordinatesToAX
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| 270 | xchg si, ax ; Software (Y,X) coordinates now in SI
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| 271 | xor cx, cx
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| 272 |
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| 273 | ALIGN JUMP_ALIGN
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| 274 | .ClearRowLoop:
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| 275 | mov cl, bl ; Area width now in CX
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| 276 | mov al, SCREEN_BACKGROUND_CHARACTER
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| 277 | call DisplayPrint_RepeatCharacterFromALwithCountInCX
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| 278 |
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| 279 | xchg ax, si ; Coordinates to AX
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| 280 | inc ah ; Increment row
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| 281 | mov si, ax
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| 282 | call DisplayCursor_SetCoordinatesFromAX
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| 283 | dec bh ; Decrement rows left
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| 284 | jnz SHORT .ClearRowLoop
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| 285 |
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| 286 | pop bx
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| 287 | pop cx
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| 288 | pop si
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| 289 | ret
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| 290 |
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| 291 |
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| 292 | ;--------------------------------------------------------------------
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| 293 | ; DisplayPrint_RepeatCharacterFromALwithCountInCX
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| 294 | ; Parameters:
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| 295 | ; AL: Character to display
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| 296 | ; CX: Repeat count
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| 297 | ; DS: BDA segment (zero)
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| 298 | ; ES:DI: Ptr to cursor location in video RAM
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| 299 | ; Returns:
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| 300 | ; DI: Updated offset to video RAM
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| 301 | ; Corrupts registers:
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| 302 | ; AX, DX
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| 303 | ;--------------------------------------------------------------------
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| 304 | ALIGN JUMP_ALIGN
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| 305 | DisplayPrint_RepeatCharacterFromALwithCountInCX:
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| 306 | jcxz .NothingToRepeat
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| 307 | push cx
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| 308 |
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| 309 | ALIGN JUMP_ALIGN
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| 310 | .RepeatCharacter:
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| 311 | push ax
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| 312 | call DisplayPrint_CharacterFromAL
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| 313 | pop ax
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| 314 | loop .RepeatCharacter
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| 315 |
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| 316 | pop cx
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| 317 | .NothingToRepeat:
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| 318 | ret
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| 319 |
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| 320 |
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| 321 | ;--------------------------------------------------------------------
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| 322 | ; DisplayPrint_Newline
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| 323 | ; Parameters:
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| 324 | ; DS: BDA segment (zero)
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| 325 | ; ES:DI: Ptr to cursor location in video RAM
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| 326 | ; Returns:
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| 327 | ; DI: Updated offset to video RAM
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| 328 | ; Corrupts registers:
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| 329 | ; AX, DX
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| 330 | ;--------------------------------------------------------------------
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| 331 | ALIGN JUMP_ALIGN
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| 332 | DisplayPrint_Newline:
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| 333 | mov al, LF
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| 334 | call DisplayPrint_CharacterFromAL
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| 335 | mov al, CR
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| 336 | ; Fall to DisplayPrint_CharacterFromAL
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| 337 |
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| 338 | ;--------------------------------------------------------------------
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| 339 | ; DisplayPrint_CharacterFromAL
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| 340 | ; Parameters:
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| 341 | ; AL: Character to display
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| 342 | ; DS: BDA segment (zero)
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| 343 | ; ES:DI: Ptr to cursor location in video RAM
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| 344 | ; Returns:
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| 345 | ; DI: Updated offset to video RAM
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| 346 | ; Corrupts registers:
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| 347 | ; AX, DX
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| 348 | ;--------------------------------------------------------------------
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| 349 | ALIGN JUMP_ALIGN
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| 350 | DisplayPrint_CharacterFromAL:
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| 351 | mov ah, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
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| 352 | jmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut]
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