[52] | 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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[181] | 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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[52] | 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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[133] | 127 | xor cx, cx ; Zero character counter (and clear CF) |
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[52] | 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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