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 : 12.10.2010 |
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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_ConvertWordToAXfromStringInDSSIwithBaseInBX |
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13 | ; Parameters: |
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14 | ; BX: Numeric base (10 or 16) |
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15 | ; DS:SI: Ptr to string to convert |
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16 | ; Returns: |
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17 | ; AX: Word converted from string |
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18 | ; SI: Updated |
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19 | ; CF: Cleared if successfull |
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20 | ; Set if error during conversion |
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21 | ; Corrupts registers: |
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22 | ; Nothing |
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23 | ;-------------------------------------------------------------------- |
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24 | ALIGN JUMP_ALIGN |
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25 | String_ConvertWordToAXfromStringInDSSIwithBaseInBX: |
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26 | push di |
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27 | push dx |
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28 | |
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29 | xor di, di |
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30 | mov dx, StringProcess_ConvertToWordInDIWithBaseInBX |
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31 | call StringProcess_DSSIwithFunctionInDX |
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32 | xchg ax, di |
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33 | |
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34 | pop dx |
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35 | pop di |
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36 | ret |
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37 | |
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38 | |
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39 | ;-------------------------------------------------------------------- |
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40 | ; String_CopyDSSItoESDIandGetSizeToCX |
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41 | ; Parameters: |
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42 | ; DS:SI: Ptr to source NULL terminated string |
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43 | ; ES:DI: Ptr to destination buffer |
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44 | ; Returns: |
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45 | ; CX: Number of characters copied |
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46 | ; SI,DI: Updated by CX characters |
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47 | ; Corrupts registers: |
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48 | ; Nothing |
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49 | ;-------------------------------------------------------------------- |
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50 | ALIGN JUMP_ALIGN |
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51 | String_CopyDSSItoESDIandGetSizeToCX: |
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52 | push ax |
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53 | |
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54 | xor cx, cx |
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55 | ALIGN JUMP_ALIGN |
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56 | .CopyNextCharacter: |
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57 | lodsb ; Load from DS:SI to AL |
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58 | test al, al ; NULL to end string? |
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59 | jz SHORT .EndOfString |
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60 | stosb ; Store from AL to ES:DI |
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61 | inc cx ; Increment number of characters written |
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62 | jmp SHORT .CopyNextCharacter |
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63 | |
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64 | ALIGN JUMP_ALIGN |
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65 | .EndOfString: |
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66 | pop ax |
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67 | ret |
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68 | |
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69 | |
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70 | ;-------------------------------------------------------------------- |
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71 | ; String_GetLengthFromDSSItoCX |
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72 | ; Parameters: |
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73 | ; DS:SI: Ptr to NULL terminated string |
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74 | ; Returns: |
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75 | ; CX: String length in characters |
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76 | ; Corrupts registers: |
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77 | ; Nothing |
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78 | ;-------------------------------------------------------------------- |
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79 | ALIGN JUMP_ALIGN |
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80 | String_GetLengthFromDSSItoCX: |
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81 | push ax |
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82 | push si |
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83 | |
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84 | call Memory_ExchangeDSSIwithESDI |
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85 | xor ax, ax ; Find NULL |
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86 | mov cx, -1 ; Full segment if necessary |
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87 | repne scasb |
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88 | mov cx, di |
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89 | call Memory_ExchangeDSSIwithESDI |
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90 | |
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91 | pop si |
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92 | stc |
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93 | sbb cx, si ; Subtract NULL |
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94 | pop ax |
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95 | ret |
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