[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Functions for displaying formatted strings. |
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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 | ; DisplayFormat_ParseCharacters |
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| 9 | ; Parameters: |
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| 10 | ; DS: BDA segment (zero) |
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[44] | 11 | ; SS:BP: Pointer to first format parameter (-=2 updates to next parameter) |
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[41] | 12 | ; CS:SI: Pointer to string to format |
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| 13 | ; ES:DI: Ptr to cursor location in video RAM |
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| 14 | ; Returns: |
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[44] | 15 | ; CS:SI: Ptr to end of format string (ptr to one past NULL) |
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[41] | 16 | ; DI: Updated offset to video RAM |
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| 17 | ; Corrupts registers: |
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[44] | 18 | ; AX, BX, CX, DX, BP |
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[41] | 19 | ;-------------------------------------------------------------------- |
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| 20 | ALIGN JUMP_ALIGN |
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| 21 | DisplayFormat_ParseCharacters: |
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[44] | 22 | call ReadCharacterAndTestForNull |
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[101] | 23 | jz SHORT ReturnFromFormat |
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[44] | 24 | |
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| 25 | ePUSH_T cx, DisplayFormat_ParseCharacters ; Return address |
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| 26 | xor cx, cx ; Initial placeholder size |
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| 27 | cmp al, '%' ; Format specifier? |
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[101] | 28 | jne SHORT DisplayPrint_CharacterFromAL |
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| 29 | ; Fall to ParseFormatSpecifier |
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[44] | 30 | |
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[41] | 31 | ;-------------------------------------------------------------------- |
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[44] | 32 | ; ParseFormatSpecifier |
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[41] | 33 | ; Parameters: |
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[44] | 34 | ; CX: Placeholder size |
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| 35 | ; DS: BDA segment (zero) |
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| 36 | ; SS:BP: Pointer to first format parameter (-=2 for next parameter) |
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| 37 | ; CS:SI: Pointer to string to format |
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| 38 | ; ES:DI: Ptr to cursor location in video RAM |
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| 39 | ; Returns: |
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| 40 | ; SI: Updated to first unparsed character |
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| 41 | ; DI: Updated offset to video RAM |
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| 42 | ; BP: Updated to next format parameter |
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| 43 | ; Corrupts registers: |
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| 44 | ; AX, BX, CX, DX |
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| 45 | ;-------------------------------------------------------------------- |
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| 46 | ParseFormatSpecifier: |
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| 47 | call ReadCharacterAndTestForNull |
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| 48 | call Char_IsDecimalDigitInAL |
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[101] | 49 | jc SHORT ParsePlaceholderSizeDigitFromALtoCX |
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[44] | 50 | call GetFormatSpecifierParserToAX |
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| 51 | call ax ; Parser function |
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| 52 | dec bp |
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| 53 | dec bp ; SS:BP now points to next parameter |
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[181] | 54 | inc cx |
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| 55 | loop PrependOrAppendSpaces |
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[101] | 56 | ReturnFromFormat: |
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[44] | 57 | ret |
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| 58 | |
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| 59 | ;-------------------------------------------------------------------- |
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[101] | 60 | ; ParsePlaceholderSizeDigitFromALtoCX |
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[44] | 61 | ; Parameters: |
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| 62 | ; AL: Digit character from format string |
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| 63 | ; CX: Current placeholder size |
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| 64 | ; DS: BDA segment (zero) |
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| 65 | ; Returns: |
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| 66 | ; CX: Current placeholder size |
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| 67 | ; Jumps back to ParseFormatSpecifier |
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| 68 | ; Corrupts registers: |
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| 69 | ; AX |
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| 70 | ;-------------------------------------------------------------------- |
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| 71 | ALIGN JUMP_ALIGN |
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[101] | 72 | ParsePlaceholderSizeDigitFromALtoCX: |
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[44] | 73 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di |
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| 74 | sub al, '0' ; Digit '0'...'9' to integer 0...9 |
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| 75 | mov ah, cl ; Previous number parameter to AH |
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| 76 | aad ; AL += (AH * 10) |
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| 77 | mov cl, al ; Updated number parameter now in CX |
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| 78 | jmp SHORT ParseFormatSpecifier |
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| 79 | |
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| 80 | |
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| 81 | ;-------------------------------------------------------------------- |
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| 82 | ; ReadCharacterAndTestForNull |
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| 83 | ; Parameters: |
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[41] | 84 | ; CS:SI: Pointer next character from string |
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| 85 | ; Returns: |
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| 86 | ; AL: Character from string |
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| 87 | ; SI: Incremented to next character |
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| 88 | ; ZF: Set if NULL, cleared if valid character |
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| 89 | ; Corrupts registers: |
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| 90 | ; Nothing |
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| 91 | ;-------------------------------------------------------------------- |
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| 92 | ALIGN JUMP_ALIGN |
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[44] | 93 | ReadCharacterAndTestForNull: |
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[223] | 94 | cs lodsb ; Load from CS:SI to AL |
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[41] | 95 | test al, al ; NULL to end string? |
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| 96 | ret |
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| 97 | |
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| 98 | |
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| 99 | ;-------------------------------------------------------------------- |
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[44] | 100 | ; GetFormatSpecifierParserToAX |
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[41] | 101 | ; Parameters: |
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[44] | 102 | ; AL: Format specifier character |
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[41] | 103 | ; Returns: |
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[44] | 104 | ; AX: Offset to parser function |
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[41] | 105 | ; Corrupts registers: |
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[44] | 106 | ; AX, BX |
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[41] | 107 | ;-------------------------------------------------------------------- |
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| 108 | ALIGN JUMP_ALIGN |
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[44] | 109 | GetFormatSpecifierParserToAX: |
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| 110 | mov bx, .rgcFormatCharToLookupIndex |
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| 111 | ALIGN JUMP_ALIGN |
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| 112 | .CheckForNextSpecifierParser: |
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| 113 | cmp al, [cs:bx] |
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| 114 | je SHORT .ConvertIndexToFunctionOffset |
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| 115 | inc bx |
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| 116 | cmp bx, .rgcFormatCharToLookupIndexEnd |
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| 117 | jb SHORT .CheckForNextSpecifierParser |
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| 118 | mov ax, c_FormatCharacter |
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| 119 | ret |
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| 120 | ALIGN JUMP_ALIGN |
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| 121 | .ConvertIndexToFunctionOffset: |
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| 122 | sub bx, .rgcFormatCharToLookupIndex |
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| 123 | shl bx, 1 ; Shift for WORD lookup |
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| 124 | mov ax, [cs:bx+.rgfnFormatSpecifierParser] |
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| 125 | ret |
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[41] | 126 | |
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[44] | 127 | .rgcFormatCharToLookupIndex: |
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[134] | 128 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[184] | 129 | db "aIAduxsSct-+%" |
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[134] | 130 | %else |
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[184] | 131 | db "IAuxsc-" ; Required by XTIDE Universal BIOS |
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[134] | 132 | %endif |
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[44] | 133 | .rgcFormatCharToLookupIndexEnd: |
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| 134 | ALIGN WORD_ALIGN |
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| 135 | .rgfnFormatSpecifierParser: |
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[134] | 136 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[44] | 137 | dw a_FormatAttributeForNextCharacter |
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[134] | 138 | %endif |
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[184] | 139 | dw I_FormatDashForZero |
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[44] | 140 | dw A_FormatAttributeForRemainingString |
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[134] | 141 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[44] | 142 | dw d_FormatSignedDecimalWord |
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[134] | 143 | %endif |
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[44] | 144 | dw u_FormatUnsignedDecimalWord |
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| 145 | dw x_FormatHexadecimalWord |
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| 146 | dw s_FormatStringFromSegmentCS |
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[134] | 147 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[44] | 148 | dw S_FormatStringFromFarPointer |
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[134] | 149 | %endif |
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[44] | 150 | dw c_FormatCharacter |
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[134] | 151 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[44] | 152 | dw t_FormatRepeatCharacter |
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[134] | 153 | %endif |
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[44] | 154 | dw PrepareToPrependParameterWithSpaces |
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[134] | 155 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[44] | 156 | dw PrepareToAppendSpacesAfterParameter |
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| 157 | dw percent_FormatPercent |
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[134] | 158 | %endif |
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[41] | 159 | |
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[44] | 160 | |
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[41] | 161 | ;-------------------------------------------------------------------- |
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[44] | 162 | ; PrependOrAppendSpaces |
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[41] | 163 | ; Parameters: |
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[44] | 164 | ; CX: Minimum length for format specifier in characters |
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[41] | 165 | ; DS: BDA segment (zero) |
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| 166 | ; ES:DI: Ptr to cursor location in video RAM |
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| 167 | ; Returns: |
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[44] | 168 | ; Nothing |
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[41] | 169 | ; Corrupts registers: |
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| 170 | ; AX, BX, CX, DX |
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| 171 | ;-------------------------------------------------------------------- |
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| 172 | ALIGN JUMP_ALIGN |
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[44] | 173 | PrependOrAppendSpaces: |
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| 174 | mov ax, di |
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| 175 | sub ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 176 | test cx, cx |
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| 177 | js SHORT .PrependWithSpaces |
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| 178 | ; Fall to .AppendSpaces |
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[41] | 179 | |
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| 180 | ;-------------------------------------------------------------------- |
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[44] | 181 | ; .AppendSpaces |
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[41] | 182 | ; Parameters: |
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[44] | 183 | ; AX: Number of format parameter BYTEs printed |
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| 184 | ; CX: Minimum length for format specifier in characters |
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[41] | 185 | ; DS: BDA segment (zero) |
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| 186 | ; ES:DI: Ptr to cursor location in video RAM |
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| 187 | ; Returns: |
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[44] | 188 | ; Nothing |
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[41] | 189 | ; Corrupts registers: |
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[44] | 190 | ; AX, CX, DX |
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[41] | 191 | ;-------------------------------------------------------------------- |
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[44] | 192 | .AppendSpaces: |
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| 193 | call DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 194 | sub cx, ax |
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| 195 | jle SHORT .NothingToAppendOrPrepend |
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[41] | 196 | mov al, ' ' |
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[44] | 197 | jmp DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[41] | 198 | |
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| 199 | ;-------------------------------------------------------------------- |
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[44] | 200 | ; .PrependWithSpaces |
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[41] | 201 | ; Parameters: |
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[44] | 202 | ; AX: Number of format parameter BYTEs printed |
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| 203 | ; CX: Negative minimum length for format specifier in characters |
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[41] | 204 | ; DS: BDA segment (zero) |
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| 205 | ; ES:DI: Ptr to cursor location in video RAM |
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| 206 | ; Returns: |
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[44] | 207 | ; Nothing |
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[41] | 208 | ; Corrupts registers: |
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[44] | 209 | ; AX, BX, CX, DX |
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[41] | 210 | ;-------------------------------------------------------------------- |
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| 211 | ALIGN JUMP_ALIGN |
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[44] | 212 | .PrependWithSpaces: |
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| 213 | xchg ax, cx |
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| 214 | neg ax |
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| 215 | call DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX |
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| 216 | sub ax, cx ; AX = BYTEs to prepend, CX = BYTEs to move |
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| 217 | jle SHORT .NothingToAppendOrPrepend |
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[41] | 218 | |
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[47] | 219 | std |
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| 220 | push si |
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[41] | 221 | |
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[47] | 222 | lea si, [di-1] ; SI = Offset to last byte formatted |
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| 223 | add di, ax ; DI = Cursor location after preceeding completed |
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| 224 | push di |
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| 225 | dec di ; DI = Offset where to move last byte formatted |
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| 226 | xchg bx, ax ; BX = BYTEs to prepend |
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[48] | 227 | call .ReverseCopyCXbytesFromESSItoESDI |
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[47] | 228 | xchg ax, bx |
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| 229 | call .ReversePrintAXspacesStartingFromESDI |
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| 230 | |
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| 231 | pop di |
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| 232 | pop si |
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| 233 | cld ; Restore DF |
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| 234 | .NothingToAppendOrPrepend: |
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| 235 | ret |
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| 236 | |
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| 237 | ;-------------------------------------------------------------------- |
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[48] | 238 | ; .ReverseCopyCXbytesFromESSItoESDI |
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[47] | 239 | ; Parameters: |
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[48] | 240 | ; CX: Number of bytes to copy |
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[47] | 241 | ; DS: BDA segment (zero) |
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[48] | 242 | ; ES:SI: Ptr to old location |
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| 243 | ; ES:DI: Ptr to new location |
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[47] | 244 | ; Returns: |
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[48] | 245 | ; DI: Updated to before last character copied |
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[47] | 246 | ; Corrupts registers: |
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| 247 | ; AX, CX, DX, SI |
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| 248 | ;-------------------------------------------------------------------- |
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| 249 | ALIGN JUMP_ALIGN |
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[48] | 250 | .ReverseCopyCXbytesFromESSItoESDI: |
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| 251 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 252 | jz SHORT .CopyWithoutDisplayProcessing |
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[47] | 253 | |
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[48] | 254 | WAIT_RETRACE_IF_NECESSARY_THEN rep movsb |
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| 255 | dec di ; Point to preceeding character instead of attribute |
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| 256 | ret |
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| 257 | ALIGN JUMP_ALIGN |
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| 258 | .CopyWithoutDisplayProcessing: |
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[44] | 259 | eSEG_STR rep, es, movsb |
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[47] | 260 | ret |
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| 261 | |
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| 262 | ;-------------------------------------------------------------------- |
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| 263 | ; .ReversePrintAXspacesStartingFromESDI |
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| 264 | ; Parameters: |
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| 265 | ; AX: Number of spaces to print |
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| 266 | ; DS: BDA segment (zero) |
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| 267 | ; ES:DI: Ptr to destination in video RAM |
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| 268 | ; Returns: |
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| 269 | ; DI: Updated |
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| 270 | ; Corrupts registers: |
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| 271 | ; AX, CX, DX |
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| 272 | ALIGN JUMP_ALIGN |
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| 273 | .ReversePrintAXspacesStartingFromESDI: |
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[44] | 274 | call DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 275 | xchg cx, ax ; CX = Spaces to prepend |
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| 276 | mov al, ' ' |
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[47] | 277 | jmp DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[44] | 278 | |
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| 279 | |
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| 280 | |
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| 281 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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| 282 | ; Formatting functions |
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[41] | 283 | ; Parameters: |
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| 284 | ; DS: BDA segment (zero) |
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[44] | 285 | ; SS:BP: Pointer to next format parameter (-=2 updates to next parameter) |
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[41] | 286 | ; ES:DI: Ptr to cursor location in video RAM |
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| 287 | ; Returns: |
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[44] | 288 | ; SS:BP: Points to last WORD parameter used |
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[41] | 289 | ; Corrupts registers: |
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| 290 | ; AX, BX, DX |
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[44] | 291 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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[134] | 292 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[41] | 293 | ALIGN JUMP_ALIGN |
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[44] | 294 | a_FormatAttributeForNextCharacter: |
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[41] | 295 | mov bl, [bp] |
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| 296 | xchg bl, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute] |
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[44] | 297 | push bx |
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| 298 | push cx |
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| 299 | push di |
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| 300 | call DisplayFormat_ParseCharacters ; Recursive call |
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| 301 | pop WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 302 | pop cx |
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| 303 | pop bx |
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[41] | 304 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], bl |
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[44] | 305 | ret |
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[134] | 306 | %endif |
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[41] | 307 | |
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| 308 | ALIGN JUMP_ALIGN |
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[44] | 309 | A_FormatAttributeForRemainingString: |
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[41] | 310 | mov al, [bp] |
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| 311 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
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[44] | 312 | ret |
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[41] | 313 | |
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[134] | 314 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[41] | 315 | ALIGN JUMP_ALIGN |
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[44] | 316 | d_FormatSignedDecimalWord: |
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[41] | 317 | mov ax, [bp] |
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[44] | 318 | mov bx, 10 |
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| 319 | jmp DisplayPrint_SignedWordFromAXWithBaseInBX |
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[134] | 320 | %endif |
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[41] | 321 | |
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[223] | 322 | ALIGN JUMP_ALIGN |
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[44] | 323 | u_FormatUnsignedDecimalWord: |
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[41] | 324 | mov ax, [bp] |
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| 325 | mov bx, 10 |
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[44] | 326 | jmp DisplayPrint_WordFromAXWithBaseInBX |
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[41] | 327 | |
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| 328 | ALIGN JUMP_ALIGN |
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[44] | 329 | x_FormatHexadecimalWord: |
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[41] | 330 | mov ax, [bp] |
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| 331 | mov bx, 16 |
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| 332 | call DisplayPrint_WordFromAXWithBaseInBX |
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| 333 | mov al, 'h' |
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[44] | 334 | jmp DisplayPrint_CharacterFromAL |
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[41] | 335 | |
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| 336 | ALIGN JUMP_ALIGN |
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[184] | 337 | I_FormatDashForZero: |
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| 338 | mov ax, [bp] |
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| 339 | test ax,ax |
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[223] | 340 | jnz u_FormatUnsignedDecimalWord |
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[184] | 341 | mov [bp], word g_szDashForZero |
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| 342 | ;;; fall-through |
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[223] | 343 | |
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[184] | 344 | ALIGN JUMP_ALIGN |
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[44] | 345 | s_FormatStringFromSegmentCS: |
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[41] | 346 | xchg si, [bp] |
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| 347 | call DisplayPrint_NullTerminatedStringFromCSSI |
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[44] | 348 | mov si, [bp] |
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| 349 | ret |
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[41] | 350 | |
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[134] | 351 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[41] | 352 | ALIGN JUMP_ALIGN |
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[44] | 353 | S_FormatStringFromFarPointer: |
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| 354 | mov bx, [bp-2] |
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[41] | 355 | xchg si, [bp] |
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| 356 | call DisplayPrint_NullTerminatedStringFromBXSI |
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[44] | 357 | mov si, [bp] |
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| 358 | dec bp |
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| 359 | dec bp |
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| 360 | ret |
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[134] | 361 | %endif |
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[41] | 362 | |
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| 363 | ALIGN JUMP_ALIGN |
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[44] | 364 | c_FormatCharacter: |
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[41] | 365 | mov al, [bp] |
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[44] | 366 | jmp DisplayPrint_CharacterFromAL |
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[41] | 367 | |
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[134] | 368 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[41] | 369 | ALIGN JUMP_ALIGN |
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[44] | 370 | t_FormatRepeatCharacter: |
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| 371 | push cx |
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[41] | 372 | mov cx, [bp-2] |
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| 373 | mov al, [bp] |
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| 374 | call DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[44] | 375 | pop cx |
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| 376 | dec bp |
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| 377 | dec bp |
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| 378 | ret |
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[41] | 379 | |
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| 380 | ALIGN JUMP_ALIGN |
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[44] | 381 | percent_FormatPercent: |
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[41] | 382 | mov al, '%' |
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[44] | 383 | jmp DisplayPrint_CharacterFromAL |
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[134] | 384 | %endif |
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[41] | 385 | |
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| 386 | ALIGN JUMP_ALIGN |
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[44] | 387 | PrepareToPrependParameterWithSpaces: |
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| 388 | neg cx |
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| 389 | ; Fall to PrepareToAppendSpacesAfterParameter |
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[41] | 390 | |
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| 391 | ALIGN JUMP_ALIGN |
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[44] | 392 | PrepareToAppendSpacesAfterParameter: |
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| 393 | add sp, BYTE 2 ; Remove return offset |
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| 394 | jmp ParseFormatSpecifier |
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