1 | ; Project name : Assembly Library |
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2 | ; Description : Functions for handling characters. |
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3 | |
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4 | ; Section containing code |
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5 | SECTION .text |
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6 | |
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7 | ;-------------------------------------------------------------------- |
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8 | ; String_ConvertDSSItoLowerCase |
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9 | ; Parameters: |
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10 | ; DS:SI: Ptr to string to convert |
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11 | ; Returns: |
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12 | ; CX: Number of characters processed |
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13 | ; SI: Updated |
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14 | ; Corrupts registers: |
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15 | ; Nothing |
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16 | ;-------------------------------------------------------------------- |
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17 | ALIGN JUMP_ALIGN |
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18 | String_ConvertDSSItoLowerCase: |
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19 | push dx |
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20 | push ax |
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21 | |
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22 | mov dx, StringProcess_ConvertToLowerCase |
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23 | call StringProcess_DSSIwithFunctionInDX |
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24 | |
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25 | pop ax |
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26 | pop dx |
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27 | ret |
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28 | |
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29 | |
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30 | ;-------------------------------------------------------------------- |
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31 | ; String_ConvertWordToAXfromStringInDSSIwithBaseInBX |
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32 | ; Parameters: |
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33 | ; BX: Numeric base (10 or 16) |
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34 | ; DS:SI: Ptr to string to convert |
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35 | ; Returns: |
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36 | ; AX: Word converted from string |
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37 | ; CX: Number of characters processed |
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38 | ; SI: Updated |
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39 | ; CF: Cleared if successfull |
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40 | ; Set if error during conversion |
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41 | ; Corrupts registers: |
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42 | ; Nothing |
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43 | ;-------------------------------------------------------------------- |
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44 | ALIGN JUMP_ALIGN |
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45 | String_ConvertWordToAXfromStringInDSSIwithBaseInBX: |
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46 | push di |
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47 | push dx |
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48 | |
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49 | xor di, di |
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50 | mov dx, StringProcess_ConvertToWordInDIWithBaseInBX |
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51 | call StringProcess_DSSIwithFunctionInDX |
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52 | xchg ax, di |
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53 | |
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54 | pop dx |
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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 | ; String_CopyDSSItoESDIandGetLengthToCX |
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61 | ; Parameters: |
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62 | ; DS:SI: Ptr to source NULL terminated string |
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63 | ; ES:DI: Ptr to destination buffer |
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64 | ; Returns: |
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65 | ; CX: Number of characters copied |
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66 | ; SI,DI: Updated by CX characters |
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67 | ; Corrupts registers: |
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68 | ; Nothing |
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69 | ;-------------------------------------------------------------------- |
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70 | ALIGN JUMP_ALIGN |
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71 | String_CopyDSSItoESDIandGetLengthToCX: |
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72 | push ax |
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73 | |
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74 | xor cx, cx |
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75 | ALIGN JUMP_ALIGN |
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76 | .CopyNextCharacter: |
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77 | lodsb ; Load from DS:SI to AL |
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78 | test al, al ; NULL to end string? |
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79 | jz SHORT .EndOfString |
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80 | stosb ; Store from AL to ES:DI |
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81 | inc cx ; Increment number of characters written |
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82 | jmp SHORT .CopyNextCharacter |
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83 | |
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84 | ALIGN JUMP_ALIGN |
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85 | .EndOfString: |
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86 | pop ax |
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87 | ret |
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88 | |
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89 | |
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90 | ;-------------------------------------------------------------------- |
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91 | ; String_GetLengthFromDSSItoCX |
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92 | ; Parameters: |
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93 | ; DS:SI: Ptr to NULL terminated string |
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94 | ; Returns: |
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95 | ; CX: String length in characters |
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96 | ; Corrupts registers: |
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97 | ; Nothing |
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98 | ;-------------------------------------------------------------------- |
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99 | ALIGN JUMP_ALIGN |
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100 | String_GetLengthFromDSSItoCX: |
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101 | push ax |
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102 | push si |
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103 | |
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104 | call Registers_ExchangeDSSIwithESDI |
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105 | xor ax, ax ; Find NULL |
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106 | mov cx, -1 ; Full segment if necessary |
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107 | repne scasb |
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108 | mov cx, di |
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109 | call Registers_ExchangeDSSIwithESDI |
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110 | |
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111 | pop si |
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112 | stc |
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113 | sbb cx, si ; Subtract NULL |
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114 | pop ax |
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115 | ret |
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