1 | ; File name : String.asm |
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2 | ; Project name : Assembly Library |
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3 | ; Created date : 12.7.2010 |
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4 | ; Last update : 13.10.2010 |
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5 | ; Author : Tomi Tilli |
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6 | ; Description : Functions for handling characters. |
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7 | |
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8 | ; Section containing code |
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9 | SECTION .text |
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10 | |
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11 | ;-------------------------------------------------------------------- |
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12 | ; String_ConvertDSSItoLowerCase |
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13 | ; Parameters: |
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14 | ; DS:SI: Ptr to string to convert |
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15 | ; Returns: |
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16 | ; CX: Number of characters processed |
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17 | ; SI: Updated |
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18 | ; Corrupts registers: |
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19 | ; Nothing |
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20 | ;-------------------------------------------------------------------- |
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21 | ALIGN JUMP_ALIGN |
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22 | String_ConvertDSSItoLowerCase: |
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23 | push dx |
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24 | push ax |
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25 | |
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26 | mov dx, StringProcess_ConvertToLowerCase |
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27 | call StringProcess_DSSIwithFunctionInDX |
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28 | |
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29 | pop ax |
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30 | pop dx |
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31 | ret |
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32 | |
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33 | |
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34 | ;-------------------------------------------------------------------- |
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35 | ; String_ConvertWordToAXfromStringInDSSIwithBaseInBX |
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36 | ; Parameters: |
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37 | ; BX: Numeric base (10 or 16) |
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38 | ; DS:SI: Ptr to string to convert |
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39 | ; Returns: |
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40 | ; AX: Word converted from string |
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41 | ; CX: Number of characters processed |
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42 | ; SI: Updated |
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43 | ; CF: Cleared if successfull |
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44 | ; Set if error during conversion |
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45 | ; Corrupts registers: |
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46 | ; Nothing |
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47 | ;-------------------------------------------------------------------- |
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48 | ALIGN JUMP_ALIGN |
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49 | String_ConvertWordToAXfromStringInDSSIwithBaseInBX: |
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50 | push di |
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51 | push dx |
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52 | |
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53 | xor di, di |
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54 | mov dx, StringProcess_ConvertToWordInDIWithBaseInBX |
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55 | call StringProcess_DSSIwithFunctionInDX |
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56 | xchg ax, di |
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57 | |
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58 | pop dx |
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59 | pop di |
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60 | ret |
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61 | |
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62 | |
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63 | ;-------------------------------------------------------------------- |
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64 | ; String_CopyDSSItoESDIandGetLengthToCX |
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65 | ; Parameters: |
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66 | ; DS:SI: Ptr to source NULL terminated string |
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67 | ; ES:DI: Ptr to destination buffer |
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68 | ; Returns: |
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69 | ; CX: Number of characters copied |
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70 | ; SI,DI: Updated by CX characters |
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71 | ; Corrupts registers: |
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72 | ; Nothing |
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73 | ;-------------------------------------------------------------------- |
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74 | ALIGN JUMP_ALIGN |
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75 | String_CopyDSSItoESDIandGetLengthToCX: |
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76 | push ax |
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77 | |
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78 | xor cx, cx |
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79 | ALIGN JUMP_ALIGN |
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80 | .CopyNextCharacter: |
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81 | lodsb ; Load from DS:SI to AL |
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82 | test al, al ; NULL to end string? |
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83 | jz SHORT .EndOfString |
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84 | stosb ; Store from AL to ES:DI |
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85 | inc cx ; Increment number of characters written |
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86 | jmp SHORT .CopyNextCharacter |
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87 | |
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88 | ALIGN JUMP_ALIGN |
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89 | .EndOfString: |
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90 | pop ax |
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91 | ret |
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92 | |
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93 | |
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94 | ;-------------------------------------------------------------------- |
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95 | ; String_GetLengthFromDSSItoCX |
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96 | ; Parameters: |
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97 | ; DS:SI: Ptr to NULL terminated string |
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98 | ; Returns: |
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99 | ; CX: String length in characters |
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100 | ; Corrupts registers: |
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101 | ; Nothing |
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102 | ;-------------------------------------------------------------------- |
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103 | ALIGN JUMP_ALIGN |
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104 | String_GetLengthFromDSSItoCX: |
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105 | push ax |
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106 | push si |
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107 | |
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108 | call Memory_ExchangeDSSIwithESDI |
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109 | xor ax, ax ; Find NULL |
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110 | mov cx, -1 ; Full segment if necessary |
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111 | repne scasb |
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112 | mov cx, di |
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113 | call Memory_ExchangeDSSIwithESDI |
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114 | |
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115 | pop si |
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116 | stc |
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117 | sbb cx, si ; Subtract NULL |
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118 | pop ax |
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119 | ret |
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