[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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[369] | 20 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 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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[369] | 71 | ALIGN DISPLAY_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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[369] | 92 | ALIGN DISPLAY_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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[369] | 108 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 109 | GetFormatSpecifierParserToAX: |
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| 110 | mov bx, .rgcFormatCharToLookupIndex |
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[369] | 111 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 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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[369] | 120 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 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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[241] | 129 | db "aIAduxsSctz-+%" |
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[134] | 130 | %else |
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[241] | 131 | db "IAuxscz-" ; 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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[241] | 154 | dw z_FormatStringFromSegmentZero |
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[44] | 155 | dw PrepareToPrependParameterWithSpaces |
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[134] | 156 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[44] | 157 | dw PrepareToAppendSpacesAfterParameter |
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| 158 | dw percent_FormatPercent |
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[134] | 159 | %endif |
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[41] | 160 | |
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[44] | 161 | |
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[41] | 162 | ;-------------------------------------------------------------------- |
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[44] | 163 | ; PrependOrAppendSpaces |
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[41] | 164 | ; Parameters: |
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[44] | 165 | ; CX: Minimum length for format specifier in characters |
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[41] | 166 | ; DS: BDA segment (zero) |
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| 167 | ; ES:DI: Ptr to cursor location in video RAM |
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| 168 | ; Returns: |
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[44] | 169 | ; Nothing |
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[41] | 170 | ; Corrupts registers: |
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| 171 | ; AX, BX, CX, DX |
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| 172 | ;-------------------------------------------------------------------- |
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[369] | 173 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 174 | PrependOrAppendSpaces: |
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| 175 | mov ax, di |
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| 176 | sub ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 177 | test cx, cx |
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| 178 | js SHORT .PrependWithSpaces |
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| 179 | ; Fall to .AppendSpaces |
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[41] | 180 | |
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| 181 | ;-------------------------------------------------------------------- |
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[44] | 182 | ; .AppendSpaces |
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[41] | 183 | ; Parameters: |
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[44] | 184 | ; AX: Number of format parameter BYTEs printed |
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| 185 | ; CX: Minimum length for format specifier in characters |
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[41] | 186 | ; DS: BDA segment (zero) |
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| 187 | ; ES:DI: Ptr to cursor location in video RAM |
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| 188 | ; Returns: |
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[44] | 189 | ; Nothing |
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[41] | 190 | ; Corrupts registers: |
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[44] | 191 | ; AX, CX, DX |
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[41] | 192 | ;-------------------------------------------------------------------- |
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[44] | 193 | .AppendSpaces: |
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| 194 | call DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 195 | sub cx, ax |
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| 196 | jle SHORT .NothingToAppendOrPrepend |
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[41] | 197 | mov al, ' ' |
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[44] | 198 | jmp DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[41] | 199 | |
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| 200 | ;-------------------------------------------------------------------- |
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[44] | 201 | ; .PrependWithSpaces |
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[41] | 202 | ; Parameters: |
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[44] | 203 | ; AX: Number of format parameter BYTEs printed |
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| 204 | ; CX: Negative minimum length for format specifier in characters |
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[41] | 205 | ; DS: BDA segment (zero) |
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| 206 | ; ES:DI: Ptr to cursor location in video RAM |
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| 207 | ; Returns: |
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[44] | 208 | ; Nothing |
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[41] | 209 | ; Corrupts registers: |
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[44] | 210 | ; AX, BX, CX, DX |
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[41] | 211 | ;-------------------------------------------------------------------- |
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[369] | 212 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 213 | .PrependWithSpaces: |
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| 214 | xchg ax, cx |
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| 215 | neg ax |
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| 216 | call DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX |
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| 217 | sub ax, cx ; AX = BYTEs to prepend, CX = BYTEs to move |
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| 218 | jle SHORT .NothingToAppendOrPrepend |
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[41] | 219 | |
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[47] | 220 | std |
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| 221 | push si |
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[41] | 222 | |
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[47] | 223 | lea si, [di-1] ; SI = Offset to last byte formatted |
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| 224 | add di, ax ; DI = Cursor location after preceeding completed |
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| 225 | push di |
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| 226 | dec di ; DI = Offset where to move last byte formatted |
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| 227 | xchg bx, ax ; BX = BYTEs to prepend |
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[48] | 228 | call .ReverseCopyCXbytesFromESSItoESDI |
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[47] | 229 | xchg ax, bx |
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| 230 | call .ReversePrintAXspacesStartingFromESDI |
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| 231 | |
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| 232 | pop di |
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| 233 | pop si |
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| 234 | cld ; Restore DF |
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| 235 | .NothingToAppendOrPrepend: |
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| 236 | ret |
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| 237 | |
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| 238 | ;-------------------------------------------------------------------- |
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[48] | 239 | ; .ReverseCopyCXbytesFromESSItoESDI |
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[47] | 240 | ; Parameters: |
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[48] | 241 | ; CX: Number of bytes to copy |
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[47] | 242 | ; DS: BDA segment (zero) |
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[48] | 243 | ; ES:SI: Ptr to old location |
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| 244 | ; ES:DI: Ptr to new location |
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[47] | 245 | ; Returns: |
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[48] | 246 | ; DI: Updated to before last character copied |
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[47] | 247 | ; Corrupts registers: |
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| 248 | ; AX, CX, DX, SI |
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| 249 | ;-------------------------------------------------------------------- |
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[369] | 250 | ALIGN DISPLAY_JUMP_ALIGN |
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[48] | 251 | .ReverseCopyCXbytesFromESSItoESDI: |
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| 252 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 253 | jz SHORT .CopyWithoutDisplayProcessing |
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[47] | 254 | |
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[48] | 255 | WAIT_RETRACE_IF_NECESSARY_THEN rep movsb |
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| 256 | dec di ; Point to preceeding character instead of attribute |
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| 257 | ret |
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[369] | 258 | ALIGN DISPLAY_JUMP_ALIGN |
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[48] | 259 | .CopyWithoutDisplayProcessing: |
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[44] | 260 | eSEG_STR rep, es, movsb |
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[47] | 261 | ret |
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| 262 | |
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| 263 | ;-------------------------------------------------------------------- |
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| 264 | ; .ReversePrintAXspacesStartingFromESDI |
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| 265 | ; Parameters: |
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| 266 | ; AX: Number of spaces to print |
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| 267 | ; DS: BDA segment (zero) |
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| 268 | ; ES:DI: Ptr to destination in video RAM |
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| 269 | ; Returns: |
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| 270 | ; DI: Updated |
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| 271 | ; Corrupts registers: |
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| 272 | ; AX, CX, DX |
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[369] | 273 | ALIGN DISPLAY_JUMP_ALIGN |
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[47] | 274 | .ReversePrintAXspacesStartingFromESDI: |
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[44] | 275 | call DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 276 | xchg cx, ax ; CX = Spaces to prepend |
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| 277 | mov al, ' ' |
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[47] | 278 | jmp DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[44] | 279 | |
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| 280 | |
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| 281 | |
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| 282 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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| 283 | ; Formatting functions |
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[41] | 284 | ; Parameters: |
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| 285 | ; DS: BDA segment (zero) |
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[44] | 286 | ; SS:BP: Pointer to next format parameter (-=2 updates to next parameter) |
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[41] | 287 | ; ES:DI: Ptr to cursor location in video RAM |
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| 288 | ; Returns: |
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[44] | 289 | ; SS:BP: Points to last WORD parameter used |
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[41] | 290 | ; Corrupts registers: |
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| 291 | ; AX, BX, DX |
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[44] | 292 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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[134] | 293 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 294 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 295 | a_FormatAttributeForNextCharacter: |
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[41] | 296 | mov bl, [bp] |
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| 297 | xchg bl, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute] |
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[44] | 298 | push bx |
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| 299 | push cx |
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| 300 | push di |
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| 301 | call DisplayFormat_ParseCharacters ; Recursive call |
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| 302 | pop WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 303 | pop cx |
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| 304 | pop bx |
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[41] | 305 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], bl |
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[44] | 306 | ret |
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[134] | 307 | %endif |
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[41] | 308 | |
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[369] | 309 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 310 | A_FormatAttributeForRemainingString: |
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[41] | 311 | mov al, [bp] |
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| 312 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
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[44] | 313 | ret |
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[41] | 314 | |
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[134] | 315 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 316 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 317 | d_FormatSignedDecimalWord: |
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[41] | 318 | mov ax, [bp] |
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[44] | 319 | mov bx, 10 |
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| 320 | jmp DisplayPrint_SignedWordFromAXWithBaseInBX |
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[134] | 321 | %endif |
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[41] | 322 | |
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[369] | 323 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 324 | u_FormatUnsignedDecimalWord: |
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[41] | 325 | mov ax, [bp] |
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| 326 | mov bx, 10 |
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[44] | 327 | jmp DisplayPrint_WordFromAXWithBaseInBX |
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[41] | 328 | |
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[369] | 329 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 330 | x_FormatHexadecimalWord: |
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[41] | 331 | mov ax, [bp] |
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| 332 | mov bx, 16 |
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| 333 | call DisplayPrint_WordFromAXWithBaseInBX |
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| 334 | mov al, 'h' |
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[44] | 335 | jmp DisplayPrint_CharacterFromAL |
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[41] | 336 | |
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[369] | 337 | ALIGN DISPLAY_JUMP_ALIGN |
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[184] | 338 | I_FormatDashForZero: |
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| 339 | mov ax, [bp] |
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| 340 | test ax,ax |
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[223] | 341 | jnz u_FormatUnsignedDecimalWord |
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[184] | 342 | mov [bp], word g_szDashForZero |
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| 343 | ;;; fall-through |
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[223] | 344 | |
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[369] | 345 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 346 | s_FormatStringFromSegmentCS: |
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[241] | 347 | push si |
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| 348 | push cx |
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| 349 | mov si, [bp] |
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[341] | 350 | |
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[241] | 351 | cmp si, byte 07fh ; well within the boundaries of ROMVARS_size |
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| 352 | jb .notFormatted |
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| 353 | |
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| 354 | dec bp |
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| 355 | dec bp |
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| 356 | call DisplayFormat_ParseCharacters |
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| 357 | inc bp ; will be decremented after the call is done |
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| 358 | inc bp |
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| 359 | jmp .done |
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[341] | 360 | |
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| 361 | .notFormatted: |
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[241] | 362 | call DisplayPrint_NullTerminatedStringFromCSSI |
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[341] | 363 | |
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[241] | 364 | .done: |
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| 365 | pop cx |
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| 366 | pop si |
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[341] | 367 | ret |
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[241] | 368 | |
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[369] | 369 | ALIGN DISPLAY_JUMP_ALIGN |
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[341] | 370 | z_FormatStringFromSegmentZero: |
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[41] | 371 | xchg si, [bp] |
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[241] | 372 | xor bx, bx |
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| 373 | call DisplayPrint_NullTerminatedStringFromBXSI |
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[44] | 374 | mov si, [bp] |
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[341] | 375 | ret |
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[41] | 376 | |
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[134] | 377 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 378 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 379 | S_FormatStringFromFarPointer: |
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| 380 | mov bx, [bp-2] |
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[41] | 381 | xchg si, [bp] |
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| 382 | call DisplayPrint_NullTerminatedStringFromBXSI |
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[44] | 383 | mov si, [bp] |
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| 384 | dec bp |
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| 385 | dec bp |
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| 386 | ret |
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[134] | 387 | %endif |
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[41] | 388 | |
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[369] | 389 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 390 | c_FormatCharacter: |
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[41] | 391 | mov al, [bp] |
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[44] | 392 | jmp DisplayPrint_CharacterFromAL |
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[41] | 393 | |
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[134] | 394 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 395 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 396 | t_FormatRepeatCharacter: |
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| 397 | push cx |
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[41] | 398 | mov cx, [bp-2] |
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| 399 | mov al, [bp] |
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| 400 | call DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[44] | 401 | pop cx |
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| 402 | dec bp |
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| 403 | dec bp |
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| 404 | ret |
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[41] | 405 | |
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[369] | 406 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 407 | percent_FormatPercent: |
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[41] | 408 | mov al, '%' |
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[44] | 409 | jmp DisplayPrint_CharacterFromAL |
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[134] | 410 | %endif |
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[41] | 411 | |
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[369] | 412 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 413 | PrepareToPrependParameterWithSpaces: |
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| 414 | neg cx |
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| 415 | ; Fall to PrepareToAppendSpacesAfterParameter |
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[41] | 416 | |
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[369] | 417 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 418 | PrepareToAppendSpacesAfterParameter: |
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| 419 | add sp, BYTE 2 ; Remove return offset |
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| 420 | jmp ParseFormatSpecifier |
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