| 1 | ; File name : ItemLineSplitter.asm
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| 2 | ; Project name : Assembly Library
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| 3 | ; Created date : 12.10.2010
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| 4 | ; Last update : 12.10.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for splitting strings to item lines.
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| 7 |
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| 8 | struc ITEM_LINE_SPLITTER
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| 9 | .wMaxTextLineLength resb 2
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| 10 | .wLineToFind resb 2
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| 11 | .wStartOfLine resb 2
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| 12 | endstruc
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| 13 |
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| 14 | ; Section containing code
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| 15 | SECTION .text
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| 16 |
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| 17 | ;--------------------------------------------------------------------
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| 18 | ; ItemLineSplitter_GetLinesToAXforStringInDSSI
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| 19 | ; Parameters:
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| 20 | ; DS:SI: Ptr to string
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| 21 | ; SS:BP: Ptr to MENU
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| 22 | ; Returns:
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| 23 | ; AX: Number of lines on string
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| 24 | ; Corrupts registers:
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| 25 | ; BX, CX, DX, SI
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| 26 | ;--------------------------------------------------------------------
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| 27 | ALIGN JUMP_ALIGN
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| 28 | ItemLineSplitter_GetLinesToAXforStringInDSSI:
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| 29 | push di
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| 30 |
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| 31 | call MenuLocation_GetMaxTextLineLengthToAX
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| 32 | eENTER_STRUCT ITEM_LINE_SPLITTER_size
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| 33 | mov [bp+ITEM_LINE_SPLITTER.wMaxTextLineLength], ax
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| 34 | mov WORD [bp+ITEM_LINE_SPLITTER.wLineToFind], -1
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| 35 |
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| 36 | xor bx, bx ; Line index
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| 37 | mov di, si ; Start of first word
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| 38 | mov dx, ProcessCharacterFromStringToSplit
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| 39 | call StringProcess_DSSIwithFunctionInDX
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| 40 |
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| 41 | lea ax, [bx+1]
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| 42 | eLEAVE_STRUCT ITEM_LINE_SPLITTER_size
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| 43 | pop di
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| 44 | ret
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| 45 |
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| 46 |
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| 47 | ;--------------------------------------------------------------------
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| 48 | ; ItemLineSplitter_GetLineToDSSIandLengthToCXfromStringInDSSIwithIndexInCX
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| 49 | ; Parameters:
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| 50 | ; CX: Index of line to search for
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| 51 | ; DS:SI: Ptr to string
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| 52 | ; SS:BP: Ptr to MENU
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| 53 | ; Returns:
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| 54 | ; CX: Line length
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| 55 | ; DS:SI: Ptr to beginning of line
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| 56 | ; CF: Set if wanted line was found
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| 57 | ; Corrupts registers:
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| 58 | ; AX, BX, DX
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| 59 | ;--------------------------------------------------------------------
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| 60 | ALIGN JUMP_ALIGN
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| 61 | ItemLineSplitter_GetLineToDSSIandLengthToCXfromStringInDSSIwithIndexInCX:
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| 62 | push di
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| 63 |
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| 64 | call MenuLocation_GetMaxTextLineLengthToAX
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| 65 | eENTER_STRUCT ITEM_LINE_SPLITTER_size
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| 66 | mov [bp+ITEM_LINE_SPLITTER.wMaxTextLineLength], ax
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| 67 | mov [bp+ITEM_LINE_SPLITTER.wLineToFind], cx
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| 68 | mov [bp+ITEM_LINE_SPLITTER.wStartOfLine], si
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| 69 |
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| 70 | xor bx, bx ; Line index
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| 71 | mov di, si ; Start of first word
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| 72 | mov dx, ProcessCharacterFromStringToSplit
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| 73 | call StringProcess_DSSIwithFunctionInDX
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| 74 |
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| 75 | mov si, [bp+ITEM_LINE_SPLITTER.wStartOfLine]
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| 76 | jc SHORT .ReturnLineInDSSIandLengthInCX
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| 77 | call String_GetLengthFromDSSItoCX ; Last or invalid line. Just return last line.
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| 78 |
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| 79 | ALIGN JUMP_ALIGN
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| 80 | .ReturnLineInDSSIandLengthInCX:
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| 81 | eLEAVE_STRUCT ITEM_LINE_SPLITTER_size
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| 82 | pop di
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| 83 | stc
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| 84 | ret
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| 85 |
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| 86 |
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| 87 | ;--------------------------------------------------------------------
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| 88 | ; Character processing callback function prototype for StringProcess_DSSIwithFunctionInBX.
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| 89 | ; ProcessCharacterFromStringToSplit
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| 90 | ; Parameters:
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| 91 | ; AL: Character to process
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| 92 | ; BX: Line index
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| 93 | ; CX: Number of characters processed (Characters on line so far)
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| 94 | ; DS:SI: Ptr to next character
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| 95 | ; DS:DI: Start of current word
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| 96 | ; SS:BP: Ptr to ITEM_LINE_SPLITTER
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| 97 | ; Returns:
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| 98 | ; CF: Clear to continue with next character
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| 99 | ; Set to stop processing
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| 100 | ; BX: Line index
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| 101 | ; CX: Characters on line so far
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| 102 | ; DS:DI: Start of current word
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| 103 | ; Corrupts registers:
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| 104 | ; AX
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| 105 | ;--------------------------------------------------------------------
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| 106 | ALIGN JUMP_ALIGN
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| 107 | ProcessCharacterFromStringToSplit:
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| 108 | cmp al, ' '
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| 109 | ja SHORT .CheckLineLength
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| 110 | mov di, si ; DS:DI now points start of new word
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| 111 | je SHORT .CheckLineLength
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| 112 |
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| 113 | cmp al, LF
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| 114 | je SHORT .ChangeToNextLine
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| 115 | cmp al, CR
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| 116 | jne SHORT .IgnoreUnsupportedControlCharacter
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| 117 | xor cx, cx ; Carriage return so reset line length so far
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| 118 |
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| 119 | ALIGN JUMP_ALIGN
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| 120 | .CheckLineLength:
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| 121 | cmp cx, [bp+ITEM_LINE_SPLITTER.wMaxTextLineLength]
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| 122 | ja SHORT .ChangeToNextLine
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| 123 | clc
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| 124 | ret
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| 125 |
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| 126 | ALIGN JUMP_ALIGN
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| 127 | .ChangeToNextLine:
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| 128 | cmp bx, [bp+ITEM_LINE_SPLITTER.wLineToFind]
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| 129 | je SHORT .WantedLineFound
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| 130 |
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| 131 | inc bx ; Increment line
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| 132 | xor cx, cx ; Zero character counter
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| 133 | mov si, di ; Start from complete word
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| 134 | mov [bp+ITEM_LINE_SPLITTER.wStartOfLine], di
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| 135 | clc
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| 136 | ret
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| 137 |
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| 138 | ALIGN JUMP_ALIGN
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| 139 | .IgnoreUnsupportedControlCharacter:
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| 140 | dec cx
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| 141 | clc
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| 142 | ret
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| 143 |
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| 144 | ALIGN JUMP_ALIGN
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| 145 | .WantedLineFound:
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| 146 | lea cx, [di-1]
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| 147 | sub cx, [bp+ITEM_LINE_SPLITTER.wStartOfLine]
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| 148 | stc
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| 149 | ret
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