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 cx, [bp+ITEM_LINE_SPLITTER.wMaxTextLineLength] |
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118 | ja SHORT .ChangeToNextLine |
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119 | clc |
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120 | ret |
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121 | |
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122 | ALIGN JUMP_ALIGN |
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123 | .ChangeToNextLine: |
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124 | cmp bx, [bp+ITEM_LINE_SPLITTER.wLineToFind] |
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125 | je SHORT .WantedLineFound |
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126 | |
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127 | inc bx ; Increment line |
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128 | xor cx, cx ; Zero character counter (and clear CF) |
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129 | mov si, di ; Start from complete word |
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130 | mov [bp+ITEM_LINE_SPLITTER.wStartOfLine], di |
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131 | ret |
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132 | |
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133 | ALIGN JUMP_ALIGN |
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134 | .IgnoreUnsupportedControlCharacter: |
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135 | dec cx |
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136 | clc |
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137 | ret |
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138 | |
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139 | ALIGN JUMP_ALIGN |
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140 | .WantedLineFound: |
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141 | lea cx, [di-1] |
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142 | sub cx, [bp+ITEM_LINE_SPLITTER.wStartOfLine] |
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143 | stc |
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144 | ret |
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