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