[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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[376] | 4 | ; |
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[445] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[445] | 12 | ; |
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[376] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[445] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[445] | 18 | ; |
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[376] | 19 | |
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[41] | 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;-------------------------------------------------------------------- |
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| 24 | ; DisplayFormat_ParseCharacters |
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| 25 | ; Parameters: |
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| 26 | ; DS: BDA segment (zero) |
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[44] | 27 | ; SS:BP: Pointer to first format parameter (-=2 updates to next parameter) |
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[41] | 28 | ; CS:SI: Pointer to string to format |
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| 29 | ; ES:DI: Ptr to cursor location in video RAM |
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| 30 | ; Returns: |
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[44] | 31 | ; CS:SI: Ptr to end of format string (ptr to one past NULL) |
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[41] | 32 | ; DI: Updated offset to video RAM |
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| 33 | ; Corrupts registers: |
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[44] | 34 | ; AX, BX, CX, DX, BP |
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[41] | 35 | ;-------------------------------------------------------------------- |
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[369] | 36 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 37 | DisplayFormat_ParseCharacters: |
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[44] | 38 | call ReadCharacterAndTestForNull |
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[101] | 39 | jz SHORT ReturnFromFormat |
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[44] | 40 | |
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| 41 | ePUSH_T cx, DisplayFormat_ParseCharacters ; Return address |
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| 42 | xor cx, cx ; Initial placeholder size |
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| 43 | cmp al, '%' ; Format specifier? |
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[101] | 44 | jne SHORT DisplayPrint_CharacterFromAL |
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| 45 | ; Fall to ParseFormatSpecifier |
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[44] | 46 | |
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[41] | 47 | ;-------------------------------------------------------------------- |
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[44] | 48 | ; ParseFormatSpecifier |
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[41] | 49 | ; Parameters: |
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[44] | 50 | ; CX: Placeholder size |
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| 51 | ; DS: BDA segment (zero) |
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| 52 | ; SS:BP: Pointer to first format parameter (-=2 for next parameter) |
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| 53 | ; CS:SI: Pointer to string to format |
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| 54 | ; ES:DI: Ptr to cursor location in video RAM |
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| 55 | ; Returns: |
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| 56 | ; SI: Updated to first unparsed character |
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| 57 | ; DI: Updated offset to video RAM |
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| 58 | ; BP: Updated to next format parameter |
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| 59 | ; Corrupts registers: |
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| 60 | ; AX, BX, CX, DX |
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| 61 | ;-------------------------------------------------------------------- |
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| 62 | ParseFormatSpecifier: |
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| 63 | call ReadCharacterAndTestForNull |
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| 64 | call Char_IsDecimalDigitInAL |
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[101] | 65 | jc SHORT ParsePlaceholderSizeDigitFromALtoCX |
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[44] | 66 | call GetFormatSpecifierParserToAX |
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| 67 | call ax ; Parser function |
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| 68 | dec bp |
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| 69 | dec bp ; SS:BP now points to next parameter |
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[181] | 70 | inc cx |
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| 71 | loop PrependOrAppendSpaces |
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[101] | 72 | ReturnFromFormat: |
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[44] | 73 | ret |
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| 74 | |
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| 75 | ;-------------------------------------------------------------------- |
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[101] | 76 | ; ParsePlaceholderSizeDigitFromALtoCX |
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[44] | 77 | ; Parameters: |
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| 78 | ; AL: Digit character from format string |
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| 79 | ; CX: Current placeholder size |
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| 80 | ; DS: BDA segment (zero) |
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| 81 | ; Returns: |
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| 82 | ; CX: Current placeholder size |
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| 83 | ; Jumps back to ParseFormatSpecifier |
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| 84 | ; Corrupts registers: |
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| 85 | ; AX |
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| 86 | ;-------------------------------------------------------------------- |
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[369] | 87 | ALIGN DISPLAY_JUMP_ALIGN |
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[101] | 88 | ParsePlaceholderSizeDigitFromALtoCX: |
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[44] | 89 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di |
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| 90 | sub al, '0' ; Digit '0'...'9' to integer 0...9 |
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| 91 | mov ah, cl ; Previous number parameter to AH |
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| 92 | aad ; AL += (AH * 10) |
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| 93 | mov cl, al ; Updated number parameter now in CX |
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| 94 | jmp SHORT ParseFormatSpecifier |
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| 95 | |
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| 96 | |
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| 97 | ;-------------------------------------------------------------------- |
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| 98 | ; ReadCharacterAndTestForNull |
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| 99 | ; Parameters: |
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[41] | 100 | ; CS:SI: Pointer next character from string |
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| 101 | ; Returns: |
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| 102 | ; AL: Character from string |
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| 103 | ; SI: Incremented to next character |
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| 104 | ; ZF: Set if NULL, cleared if valid character |
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| 105 | ; Corrupts registers: |
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| 106 | ; Nothing |
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| 107 | ;-------------------------------------------------------------------- |
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[369] | 108 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 109 | ReadCharacterAndTestForNull: |
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[223] | 110 | cs lodsb ; Load from CS:SI to AL |
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[41] | 111 | test al, al ; NULL to end string? |
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| 112 | ret |
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| 113 | |
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| 114 | |
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| 115 | ;-------------------------------------------------------------------- |
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[44] | 116 | ; GetFormatSpecifierParserToAX |
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[41] | 117 | ; Parameters: |
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[44] | 118 | ; AL: Format specifier character |
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[41] | 119 | ; Returns: |
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[44] | 120 | ; AX: Offset to parser function |
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[41] | 121 | ; Corrupts registers: |
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[44] | 122 | ; AX, BX |
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[41] | 123 | ;-------------------------------------------------------------------- |
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[369] | 124 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 125 | GetFormatSpecifierParserToAX: |
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| 126 | mov bx, .rgcFormatCharToLookupIndex |
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[369] | 127 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 128 | .CheckForNextSpecifierParser: |
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| 129 | cmp al, [cs:bx] |
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| 130 | je SHORT .ConvertIndexToFunctionOffset |
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| 131 | inc bx |
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| 132 | cmp bx, .rgcFormatCharToLookupIndexEnd |
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| 133 | jb SHORT .CheckForNextSpecifierParser |
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| 134 | mov ax, c_FormatCharacter |
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| 135 | ret |
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[369] | 136 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 137 | .ConvertIndexToFunctionOffset: |
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| 138 | sub bx, .rgcFormatCharToLookupIndex |
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[445] | 139 | eSHL_IM bx, 1 ; Shift for WORD lookup |
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[44] | 140 | mov ax, [cs:bx+.rgfnFormatSpecifierParser] |
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| 141 | ret |
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[41] | 142 | |
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[44] | 143 | .rgcFormatCharToLookupIndex: |
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[592] | 144 | %ifndef EXCLUDE_FROM_XUB |
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[241] | 145 | db "aIAduxsSctz-+%" |
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[134] | 146 | %else |
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[241] | 147 | db "IAuxscz-" ; Required by XTIDE Universal BIOS |
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[134] | 148 | %endif |
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[44] | 149 | .rgcFormatCharToLookupIndexEnd: |
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| 150 | ALIGN WORD_ALIGN |
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| 151 | .rgfnFormatSpecifierParser: |
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[592] | 152 | %ifndef EXCLUDE_FROM_XUB |
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[44] | 153 | dw a_FormatAttributeForNextCharacter |
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[134] | 154 | %endif |
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[184] | 155 | dw I_FormatDashForZero |
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[44] | 156 | dw A_FormatAttributeForRemainingString |
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[592] | 157 | %ifndef EXCLUDE_FROM_XUB |
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[44] | 158 | dw d_FormatSignedDecimalWord |
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[134] | 159 | %endif |
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[44] | 160 | dw u_FormatUnsignedDecimalWord |
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| 161 | dw x_FormatHexadecimalWord |
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| 162 | dw s_FormatStringFromSegmentCS |
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[592] | 163 | %ifndef EXCLUDE_FROM_XUB |
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[44] | 164 | dw S_FormatStringFromFarPointer |
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[134] | 165 | %endif |
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[44] | 166 | dw c_FormatCharacter |
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[592] | 167 | %ifndef EXCLUDE_FROM_XUB |
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[44] | 168 | dw t_FormatRepeatCharacter |
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[134] | 169 | %endif |
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[241] | 170 | dw z_FormatStringFromSegmentZero |
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[44] | 171 | dw PrepareToPrependParameterWithSpaces |
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[592] | 172 | %ifndef EXCLUDE_FROM_XUB |
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[44] | 173 | dw PrepareToAppendSpacesAfterParameter |
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| 174 | dw percent_FormatPercent |
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[134] | 175 | %endif |
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[41] | 176 | |
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[44] | 177 | |
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[41] | 178 | ;-------------------------------------------------------------------- |
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[44] | 179 | ; PrependOrAppendSpaces |
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[41] | 180 | ; Parameters: |
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[44] | 181 | ; CX: Minimum length for format specifier in characters |
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[41] | 182 | ; DS: BDA segment (zero) |
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| 183 | ; ES:DI: Ptr to cursor location in video RAM |
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| 184 | ; Returns: |
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[44] | 185 | ; Nothing |
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[41] | 186 | ; Corrupts registers: |
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| 187 | ; AX, BX, CX, DX |
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| 188 | ;-------------------------------------------------------------------- |
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[369] | 189 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 190 | PrependOrAppendSpaces: |
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| 191 | mov ax, di |
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| 192 | sub ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 193 | test cx, cx |
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| 194 | js SHORT .PrependWithSpaces |
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| 195 | ; Fall to .AppendSpaces |
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[41] | 196 | |
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| 197 | ;-------------------------------------------------------------------- |
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[44] | 198 | ; .AppendSpaces |
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[41] | 199 | ; Parameters: |
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[44] | 200 | ; AX: Number of format parameter BYTEs printed |
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| 201 | ; CX: Minimum length for format specifier in characters |
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[41] | 202 | ; DS: BDA segment (zero) |
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| 203 | ; ES:DI: Ptr to cursor location in video RAM |
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| 204 | ; Returns: |
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[44] | 205 | ; Nothing |
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[41] | 206 | ; Corrupts registers: |
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[44] | 207 | ; AX, CX, DX |
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[41] | 208 | ;-------------------------------------------------------------------- |
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[44] | 209 | .AppendSpaces: |
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| 210 | call DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 211 | sub cx, ax |
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| 212 | jle SHORT .NothingToAppendOrPrepend |
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[41] | 213 | mov al, ' ' |
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[44] | 214 | jmp DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[41] | 215 | |
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| 216 | ;-------------------------------------------------------------------- |
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[44] | 217 | ; .PrependWithSpaces |
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[41] | 218 | ; Parameters: |
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[44] | 219 | ; AX: Number of format parameter BYTEs printed |
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| 220 | ; CX: Negative minimum length for format specifier in characters |
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[41] | 221 | ; DS: BDA segment (zero) |
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| 222 | ; ES:DI: Ptr to cursor location in video RAM |
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| 223 | ; Returns: |
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[44] | 224 | ; Nothing |
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[41] | 225 | ; Corrupts registers: |
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[44] | 226 | ; AX, BX, CX, DX |
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[41] | 227 | ;-------------------------------------------------------------------- |
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[369] | 228 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 229 | .PrependWithSpaces: |
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| 230 | xchg ax, cx |
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| 231 | neg ax |
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| 232 | call DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX |
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| 233 | sub ax, cx ; AX = BYTEs to prepend, CX = BYTEs to move |
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| 234 | jle SHORT .NothingToAppendOrPrepend |
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[41] | 235 | |
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[47] | 236 | std |
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| 237 | push si |
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[41] | 238 | |
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[47] | 239 | lea si, [di-1] ; SI = Offset to last byte formatted |
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| 240 | add di, ax ; DI = Cursor location after preceeding completed |
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| 241 | push di |
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| 242 | dec di ; DI = Offset where to move last byte formatted |
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| 243 | xchg bx, ax ; BX = BYTEs to prepend |
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[48] | 244 | call .ReverseCopyCXbytesFromESSItoESDI |
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[47] | 245 | xchg ax, bx |
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| 246 | call .ReversePrintAXspacesStartingFromESDI |
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| 247 | |
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| 248 | pop di |
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| 249 | pop si |
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| 250 | cld ; Restore DF |
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| 251 | .NothingToAppendOrPrepend: |
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| 252 | ret |
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| 253 | |
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| 254 | ;-------------------------------------------------------------------- |
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[48] | 255 | ; .ReverseCopyCXbytesFromESSItoESDI |
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[47] | 256 | ; Parameters: |
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[48] | 257 | ; CX: Number of bytes to copy |
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[47] | 258 | ; DS: BDA segment (zero) |
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[48] | 259 | ; ES:SI: Ptr to old location |
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| 260 | ; ES:DI: Ptr to new location |
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[47] | 261 | ; Returns: |
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[48] | 262 | ; DI: Updated to before last character copied |
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[47] | 263 | ; Corrupts registers: |
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| 264 | ; AX, CX, DX, SI |
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| 265 | ;-------------------------------------------------------------------- |
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[369] | 266 | ALIGN DISPLAY_JUMP_ALIGN |
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[48] | 267 | .ReverseCopyCXbytesFromESSItoESDI: |
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| 268 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 269 | jz SHORT .CopyWithoutDisplayProcessing |
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[47] | 270 | |
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[589] | 271 | CALL_WAIT_FOR_RETRACE_IF_NECESSARY_THEN rep movsb |
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[48] | 272 | dec di ; Point to preceeding character instead of attribute |
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| 273 | ret |
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[589] | 274 | |
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[369] | 275 | ALIGN DISPLAY_JUMP_ALIGN |
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[48] | 276 | .CopyWithoutDisplayProcessing: |
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[44] | 277 | eSEG_STR rep, es, movsb |
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[47] | 278 | ret |
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| 279 | |
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| 280 | ;-------------------------------------------------------------------- |
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| 281 | ; .ReversePrintAXspacesStartingFromESDI |
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| 282 | ; Parameters: |
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| 283 | ; AX: Number of spaces to print |
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| 284 | ; DS: BDA segment (zero) |
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| 285 | ; ES:DI: Ptr to destination in video RAM |
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| 286 | ; Returns: |
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| 287 | ; DI: Updated |
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| 288 | ; Corrupts registers: |
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| 289 | ; AX, CX, DX |
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[369] | 290 | ALIGN DISPLAY_JUMP_ALIGN |
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[47] | 291 | .ReversePrintAXspacesStartingFromESDI: |
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[44] | 292 | call DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 293 | xchg cx, ax ; CX = Spaces to prepend |
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| 294 | mov al, ' ' |
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[47] | 295 | jmp DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[44] | 296 | |
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| 297 | |
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| 298 | |
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| 299 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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| 300 | ; Formatting functions |
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[41] | 301 | ; Parameters: |
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| 302 | ; DS: BDA segment (zero) |
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[44] | 303 | ; SS:BP: Pointer to next format parameter (-=2 updates to next parameter) |
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[41] | 304 | ; ES:DI: Ptr to cursor location in video RAM |
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| 305 | ; Returns: |
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[44] | 306 | ; SS:BP: Points to last WORD parameter used |
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[41] | 307 | ; Corrupts registers: |
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| 308 | ; AX, BX, DX |
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[44] | 309 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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[592] | 310 | %ifndef EXCLUDE_FROM_XUB |
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[369] | 311 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 312 | a_FormatAttributeForNextCharacter: |
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[41] | 313 | mov bl, [bp] |
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| 314 | xchg bl, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute] |
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[44] | 315 | push bx |
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| 316 | push cx |
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| 317 | push di |
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| 318 | call DisplayFormat_ParseCharacters ; Recursive call |
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| 319 | pop WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 320 | pop cx |
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| 321 | pop bx |
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[41] | 322 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], bl |
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[44] | 323 | ret |
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[134] | 324 | %endif |
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[41] | 325 | |
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[369] | 326 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 327 | A_FormatAttributeForRemainingString: |
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[41] | 328 | mov al, [bp] |
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| 329 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
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[44] | 330 | ret |
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[41] | 331 | |
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[592] | 332 | %ifndef EXCLUDE_FROM_XUB |
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[369] | 333 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 334 | d_FormatSignedDecimalWord: |
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[41] | 335 | mov ax, [bp] |
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[590] | 336 | mov bl, 10 |
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| 337 | jmp DisplayPrint_SignedWordFromAXWithBaseInBL |
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[134] | 338 | %endif |
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[41] | 339 | |
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[369] | 340 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 341 | u_FormatUnsignedDecimalWord: |
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[41] | 342 | mov ax, [bp] |
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[590] | 343 | mov bl, 10 |
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| 344 | jmp DisplayPrint_WordFromAXWithBaseInBL |
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[41] | 345 | |
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[369] | 346 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 347 | x_FormatHexadecimalWord: |
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[41] | 348 | mov ax, [bp] |
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[590] | 349 | mov bl, 16 |
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| 350 | call DisplayPrint_WordFromAXWithBaseInBL |
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[41] | 351 | mov al, 'h' |
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[44] | 352 | jmp DisplayPrint_CharacterFromAL |
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[41] | 353 | |
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[369] | 354 | ALIGN DISPLAY_JUMP_ALIGN |
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[184] | 355 | I_FormatDashForZero: |
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[590] | 356 | cmp WORD [bp], 0 |
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| 357 | jne SHORT u_FormatUnsignedDecimalWord |
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| 358 | mov WORD [bp], g_szDashForZero |
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[184] | 359 | ;;; fall-through |
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[223] | 360 | |
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[369] | 361 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 362 | s_FormatStringFromSegmentCS: |
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[241] | 363 | push si |
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| 364 | push cx |
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| 365 | mov si, [bp] |
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[341] | 366 | |
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[590] | 367 | cmp si, BYTE 7Fh ; well within the boundaries of ROMVARS_size |
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[624] | 368 | jb SHORT .notFormatted |
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[241] | 369 | |
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| 370 | dec bp |
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| 371 | dec bp |
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| 372 | call DisplayFormat_ParseCharacters |
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| 373 | inc bp ; will be decremented after the call is done |
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| 374 | inc bp |
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[624] | 375 | jmp SHORT .done |
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[341] | 376 | |
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| 377 | .notFormatted: |
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[241] | 378 | call DisplayPrint_NullTerminatedStringFromCSSI |
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[341] | 379 | |
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[241] | 380 | .done: |
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| 381 | pop cx |
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| 382 | pop si |
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[341] | 383 | ret |
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[241] | 384 | |
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[369] | 385 | ALIGN DISPLAY_JUMP_ALIGN |
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[341] | 386 | z_FormatStringFromSegmentZero: |
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[41] | 387 | xchg si, [bp] |
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[241] | 388 | xor bx, bx |
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| 389 | call DisplayPrint_NullTerminatedStringFromBXSI |
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[44] | 390 | mov si, [bp] |
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[341] | 391 | ret |
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[41] | 392 | |
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[592] | 393 | %ifndef EXCLUDE_FROM_XUB |
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[369] | 394 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 395 | S_FormatStringFromFarPointer: |
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| 396 | mov bx, [bp-2] |
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[41] | 397 | xchg si, [bp] |
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| 398 | call DisplayPrint_NullTerminatedStringFromBXSI |
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[44] | 399 | mov si, [bp] |
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| 400 | dec bp |
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| 401 | dec bp |
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| 402 | ret |
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[134] | 403 | %endif |
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[41] | 404 | |
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[369] | 405 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 406 | c_FormatCharacter: |
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[41] | 407 | mov al, [bp] |
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[44] | 408 | jmp DisplayPrint_CharacterFromAL |
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[41] | 409 | |
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[592] | 410 | %ifndef EXCLUDE_FROM_XUB |
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[369] | 411 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 412 | t_FormatRepeatCharacter: |
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| 413 | push cx |
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[41] | 414 | mov cx, [bp-2] |
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| 415 | mov al, [bp] |
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| 416 | call DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[44] | 417 | pop cx |
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| 418 | dec bp |
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| 419 | dec bp |
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| 420 | ret |
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[41] | 421 | |
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[369] | 422 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 423 | percent_FormatPercent: |
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[41] | 424 | mov al, '%' |
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[44] | 425 | jmp DisplayPrint_CharacterFromAL |
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[134] | 426 | %endif |
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[41] | 427 | |
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[369] | 428 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 429 | PrepareToPrependParameterWithSpaces: |
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| 430 | neg cx |
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| 431 | ; Fall to PrepareToAppendSpacesAfterParameter |
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[41] | 432 | |
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[369] | 433 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 434 | PrepareToAppendSpacesAfterParameter: |
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| 435 | add sp, BYTE 2 ; Remove return offset |
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| 436 | jmp ParseFormatSpecifier |
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