| 1 | ; Project name : Assembly Library
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| 2 | ; Description : Functions for splitting strings to item lines.
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| 3 |
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| 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 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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| 12 | ;
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| 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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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 20 | struc ITEM_LINE_SPLITTER
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| 21 | .wMaxTextLineLength resb 2
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| 22 | .wLineToFind resb 2
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| 23 | .wStartOfLine resb 2
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| 24 | endstruc
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| 25 |
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| 26 | ; Section containing code
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| 27 | SECTION .text
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| 28 |
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| 29 | ;--------------------------------------------------------------------
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| 30 | ; ItemLineSplitter_GetLinesToAXforStringInDSSI
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| 31 | ; Parameters:
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| 32 | ; DS:SI: Ptr to string
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| 33 | ; SS:BP: Ptr to MENU
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| 34 | ; Returns:
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| 35 | ; AX: Number of lines on string
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| 36 | ; Corrupts registers:
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| 37 | ; BX, CX, DX, SI
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| 38 | ;--------------------------------------------------------------------
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| 39 | ALIGN JUMP_ALIGN
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| 40 | ItemLineSplitter_GetLinesToAXforStringInDSSI:
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| 41 | push di
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| 42 |
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| 43 | call MenuLocation_GetMaxTextLineLengthToAX
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| 44 | eENTER_STRUCT ITEM_LINE_SPLITTER_size
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| 45 | mov [bp+ITEM_LINE_SPLITTER.wMaxTextLineLength], ax
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| 46 | mov WORD [bp+ITEM_LINE_SPLITTER.wLineToFind], -1
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| 47 |
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| 48 | xor bx, bx ; Line index
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| 49 | mov di, si ; Start of first word
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| 50 | mov dx, ProcessCharacterFromStringToSplit
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| 51 | call StringProcess_DSSIwithFunctionInDX
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| 52 |
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| 53 | lea ax, [bx+1]
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| 54 | eLEAVE_STRUCT ITEM_LINE_SPLITTER_size
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| 55 | pop di
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| 56 | ret
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| 57 |
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| 58 |
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| 59 | ;--------------------------------------------------------------------
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| 60 | ; ItemLineSplitter_GetLineToDSSIandLengthToCXfromStringInDSSIwithIndexInCX
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| 61 | ; Parameters:
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| 62 | ; CX: Index of line to search for
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| 63 | ; DS:SI: Ptr to string
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| 64 | ; SS:BP: Ptr to MENU
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| 65 | ; Returns:
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| 66 | ; CX: Line length
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| 67 | ; DS:SI: Ptr to beginning of line
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| 68 | ; CF: Set if wanted line was found
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| 69 | ; Corrupts registers:
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| 70 | ; AX, BX, DX
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| 71 | ;--------------------------------------------------------------------
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| 72 | ALIGN JUMP_ALIGN
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| 73 | ItemLineSplitter_GetLineToDSSIandLengthToCXfromStringInDSSIwithIndexInCX:
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| 74 | push di
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| 75 |
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| 76 | call MenuLocation_GetMaxTextLineLengthToAX
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| 77 | eENTER_STRUCT ITEM_LINE_SPLITTER_size
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| 78 | mov [bp+ITEM_LINE_SPLITTER.wMaxTextLineLength], ax
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| 79 | mov [bp+ITEM_LINE_SPLITTER.wLineToFind], cx
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| 80 | mov [bp+ITEM_LINE_SPLITTER.wStartOfLine], si
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| 81 |
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| 82 | xor bx, bx ; Line index
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| 83 | mov di, si ; Start of first word
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| 84 | mov dx, ProcessCharacterFromStringToSplit
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| 85 | call StringProcess_DSSIwithFunctionInDX
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| 86 |
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| 87 | mov si, [bp+ITEM_LINE_SPLITTER.wStartOfLine]
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| 88 | jc SHORT .ReturnLineInDSSIandLengthInCX
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| 89 | call String_GetLengthFromDSSItoCX ; Last or invalid line. Just return last line.
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| 90 |
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| 91 | ALIGN JUMP_ALIGN
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| 92 | .ReturnLineInDSSIandLengthInCX:
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| 93 | eLEAVE_STRUCT ITEM_LINE_SPLITTER_size
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| 94 | pop di
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| 95 | stc
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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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| 100 | ; Character processing callback function prototype for StringProcess_DSSIwithFunctionInBX.
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| 101 | ; ProcessCharacterFromStringToSplit
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| 102 | ; Parameters:
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| 103 | ; AL: Character to process
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| 104 | ; BX: Line index
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| 105 | ; CX: Number of characters processed (Characters on line so far)
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| 106 | ; DS:SI: Ptr to next character
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| 107 | ; DS:DI: Start of current word
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| 108 | ; SS:BP: Ptr to ITEM_LINE_SPLITTER
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| 109 | ; Returns:
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| 110 | ; CF: Clear to continue with next character
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| 111 | ; Set to stop processing
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| 112 | ; BX: Line index
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| 113 | ; CX: Characters on line so far
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| 114 | ; DS:DI: Start of current word
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| 115 | ; Corrupts registers:
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| 116 | ; AX
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| 117 | ;--------------------------------------------------------------------
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| 118 | ALIGN JUMP_ALIGN
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| 119 | ProcessCharacterFromStringToSplit:
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| 120 | cmp al, ' '
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| 121 | ja SHORT .CheckLineLength
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| 122 | mov di, si ; DS:DI now points start of new word
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| 123 | je SHORT .CheckLineLength
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| 124 |
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| 125 | cmp al, LF
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| 126 | je SHORT .ChangeToNextLine
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| 127 | cmp al, CR
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| 128 | jne SHORT .IgnoreUnsupportedControlCharacter
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| 129 | xor cx, cx ; Carriage return so reset line length so far
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| 130 |
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| 131 | ALIGN JUMP_ALIGN
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| 132 | .CheckLineLength:
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| 133 | cmp [bp+ITEM_LINE_SPLITTER.wMaxTextLineLength], cx
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| 134 | jb SHORT .ChangeToNextLine
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| 135 | ret ; With CF cleared
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| 136 |
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| 137 | ALIGN JUMP_ALIGN
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| 138 | .ChangeToNextLine:
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| 139 | cmp bx, [bp+ITEM_LINE_SPLITTER.wLineToFind]
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| 140 | je SHORT .WantedLineFound
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| 141 |
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| 142 | inc bx ; Increment line
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| 143 | xor cx, cx ; Zero character counter (and clear CF)
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| 144 | mov si, di ; Start from complete word
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| 145 | mov [bp+ITEM_LINE_SPLITTER.wStartOfLine], di
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| 146 | ret
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| 147 |
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| 148 | ALIGN JUMP_ALIGN
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| 149 | .IgnoreUnsupportedControlCharacter:
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| 150 | dec cx
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| 151 | clc
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| 152 | ret
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| 153 |
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| 154 | ALIGN JUMP_ALIGN
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| 155 | .WantedLineFound:
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| 156 | lea cx, [di-1]
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| 157 | sub cx, [bp+ITEM_LINE_SPLITTER.wStartOfLine]
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| 158 | stc
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| 159 | ret
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