[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Functions for handling characters. |
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| 3 | |
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[376] | 4 | ; |
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[526] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[526] | 12 | ; |
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[376] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[526] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[526] | 18 | ; |
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[376] | 19 | |
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[41] | 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;-------------------------------------------------------------------- |
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[53] | 24 | ; String_ConvertDSSItoLowerCase |
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| 25 | ; Parameters: |
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| 26 | ; DS:SI: Ptr to string to convert |
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| 27 | ; Returns: |
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| 28 | ; CX: Number of characters processed |
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| 29 | ; SI: Updated |
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| 30 | ; Corrupts registers: |
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| 31 | ; Nothing |
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| 32 | ;-------------------------------------------------------------------- |
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[369] | 33 | ALIGN STRING_JUMP_ALIGN |
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[53] | 34 | String_ConvertDSSItoLowerCase: |
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| 35 | push dx |
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| 36 | push ax |
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| 37 | |
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| 38 | mov dx, StringProcess_ConvertToLowerCase |
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| 39 | call StringProcess_DSSIwithFunctionInDX |
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| 40 | |
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| 41 | pop ax |
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| 42 | pop dx |
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| 43 | ret |
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| 44 | |
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| 45 | |
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| 46 | ;-------------------------------------------------------------------- |
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[41] | 47 | ; String_ConvertWordToAXfromStringInDSSIwithBaseInBX |
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| 48 | ; Parameters: |
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| 49 | ; BX: Numeric base (10 or 16) |
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| 50 | ; DS:SI: Ptr to string to convert |
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| 51 | ; Returns: |
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| 52 | ; AX: Word converted from string |
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[53] | 53 | ; CX: Number of characters processed |
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[52] | 54 | ; SI: Updated |
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[293] | 55 | ; CF: Cleared if successful |
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[52] | 56 | ; Set if error during conversion |
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[41] | 57 | ; Corrupts registers: |
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[52] | 58 | ; Nothing |
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[41] | 59 | ;-------------------------------------------------------------------- |
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[369] | 60 | ALIGN STRING_JUMP_ALIGN |
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[41] | 61 | String_ConvertWordToAXfromStringInDSSIwithBaseInBX: |
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[52] | 62 | push di |
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| 63 | push dx |
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[41] | 64 | |
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[52] | 65 | xor di, di |
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| 66 | mov dx, StringProcess_ConvertToWordInDIWithBaseInBX |
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| 67 | call StringProcess_DSSIwithFunctionInDX |
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| 68 | xchg ax, di |
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[41] | 69 | |
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[52] | 70 | pop dx |
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| 71 | pop di |
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[41] | 72 | ret |
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| 73 | |
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| 74 | |
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| 75 | ;-------------------------------------------------------------------- |
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[53] | 76 | ; String_CopyDSSItoESDIandGetLengthToCX |
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[41] | 77 | ; Parameters: |
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| 78 | ; DS:SI: Ptr to source NULL terminated string |
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| 79 | ; ES:DI: Ptr to destination buffer |
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| 80 | ; Returns: |
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| 81 | ; CX: Number of characters copied |
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| 82 | ; SI,DI: Updated by CX characters |
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| 83 | ; Corrupts registers: |
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| 84 | ; Nothing |
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| 85 | ;-------------------------------------------------------------------- |
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[369] | 86 | ALIGN STRING_JUMP_ALIGN |
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[53] | 87 | String_CopyDSSItoESDIandGetLengthToCX: |
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[41] | 88 | push ax |
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[52] | 89 | |
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[41] | 90 | xor cx, cx |
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[369] | 91 | ALIGN STRING_JUMP_ALIGN |
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[52] | 92 | .CopyNextCharacter: |
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[41] | 93 | lodsb ; Load from DS:SI to AL |
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| 94 | test al, al ; NULL to end string? |
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| 95 | jz SHORT .EndOfString |
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| 96 | stosb ; Store from AL to ES:DI |
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| 97 | inc cx ; Increment number of characters written |
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[52] | 98 | jmp SHORT .CopyNextCharacter |
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[41] | 99 | |
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[369] | 100 | ALIGN STRING_JUMP_ALIGN |
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[41] | 101 | .EndOfString: |
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| 102 | pop ax |
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| 103 | ret |
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[46] | 104 | |
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| 105 | |
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| 106 | ;-------------------------------------------------------------------- |
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[52] | 107 | ; String_GetLengthFromDSSItoCX |
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[46] | 108 | ; Parameters: |
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[52] | 109 | ; DS:SI: Ptr to NULL terminated string |
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[46] | 110 | ; Returns: |
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[52] | 111 | ; CX: String length in characters |
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[46] | 112 | ; Corrupts registers: |
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| 113 | ; Nothing |
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| 114 | ;-------------------------------------------------------------------- |
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[369] | 115 | ALIGN STRING_JUMP_ALIGN |
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[52] | 116 | String_GetLengthFromDSSItoCX: |
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| 117 | push ax |
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[46] | 118 | push si |
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| 119 | |
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[54] | 120 | call Registers_ExchangeDSSIwithESDI |
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[52] | 121 | xor ax, ax ; Find NULL |
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| 122 | mov cx, -1 ; Full segment if necessary |
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| 123 | repne scasb |
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| 124 | mov cx, di |
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[54] | 125 | call Registers_ExchangeDSSIwithESDI |
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[46] | 126 | |
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[52] | 127 | pop si |
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| 128 | stc |
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| 129 | sbb cx, si ; Subtract NULL |
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[46] | 130 | pop ax |
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| 131 | ret |
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