| [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 | ; Corrupts registers:
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| 30 | ; Nothing
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| 31 | ;--------------------------------------------------------------------
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| [369] | 32 | ALIGN STRING_JUMP_ALIGN
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| [53] | 33 | String_ConvertDSSItoLowerCase:
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| 34 | push dx
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| 35 | push ax
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| 36 |
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| 37 | mov dx, StringProcess_ConvertToLowerCase
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| 38 | call StringProcess_DSSIwithFunctionInDX
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| 39 |
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| 40 | pop ax
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| 41 | pop dx
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| 42 | ret
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| 43 |
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| 44 |
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| 45 | ;--------------------------------------------------------------------
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| [41] | 46 | ; String_ConvertWordToAXfromStringInDSSIwithBaseInBX
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| 47 | ; Parameters:
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| 48 | ; BX: Numeric base (10 or 16)
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| 49 | ; DS:SI: Ptr to string to convert
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| 50 | ; Returns:
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| 51 | ; AX: Word converted from string
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| [53] | 52 | ; CX: Number of characters processed
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| [293] | 53 | ; CF: Cleared if successful
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| [52] | 54 | ; Set if error during conversion
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| [41] | 55 | ; Corrupts registers:
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| [52] | 56 | ; Nothing
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| [41] | 57 | ;--------------------------------------------------------------------
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| [369] | 58 | ALIGN STRING_JUMP_ALIGN
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| [41] | 59 | String_ConvertWordToAXfromStringInDSSIwithBaseInBX:
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| [52] | 60 | push di
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| 61 | push dx
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| [41] | 62 |
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| [52] | 63 | xor di, di
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| 64 | mov dx, StringProcess_ConvertToWordInDIWithBaseInBX
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| 65 | call StringProcess_DSSIwithFunctionInDX
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| 66 | xchg ax, di
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| [41] | 67 |
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| [52] | 68 | pop dx
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| 69 | pop di
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| [41] | 70 | ret
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| 71 |
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| 72 |
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| 73 | ;--------------------------------------------------------------------
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| [53] | 74 | ; String_CopyDSSItoESDIandGetLengthToCX
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| [41] | 75 | ; Parameters:
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| 76 | ; DS:SI: Ptr to source NULL terminated string
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| 77 | ; ES:DI: Ptr to destination buffer
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| 78 | ; Returns:
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| 79 | ; CX: Number of characters copied
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| 80 | ; SI,DI: Updated by CX characters
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| 81 | ; Corrupts registers:
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| 82 | ; Nothing
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| 83 | ;--------------------------------------------------------------------
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| [369] | 84 | ALIGN STRING_JUMP_ALIGN
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| [53] | 85 | String_CopyDSSItoESDIandGetLengthToCX:
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| [41] | 86 | push ax
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| [52] | 87 |
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| [41] | 88 | xor cx, cx
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| [369] | 89 | ALIGN STRING_JUMP_ALIGN
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| [52] | 90 | .CopyNextCharacter:
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| [41] | 91 | lodsb ; Load from DS:SI to AL
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| 92 | test al, al ; NULL to end string?
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| 93 | jz SHORT .EndOfString
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| 94 | stosb ; Store from AL to ES:DI
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| 95 | inc cx ; Increment number of characters written
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| [52] | 96 | jmp SHORT .CopyNextCharacter
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| [41] | 97 |
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| [369] | 98 | ALIGN STRING_JUMP_ALIGN
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| [41] | 99 | .EndOfString:
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| 100 | pop ax
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| 101 | ret
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| [46] | 102 |
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| 103 |
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| 104 | ;--------------------------------------------------------------------
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| [52] | 105 | ; String_GetLengthFromDSSItoCX
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| [46] | 106 | ; Parameters:
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| [52] | 107 | ; DS:SI: Ptr to NULL terminated string
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| [46] | 108 | ; Returns:
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| [52] | 109 | ; CX: String length in characters
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| [46] | 110 | ; Corrupts registers:
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| 111 | ; Nothing
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| 112 | ;--------------------------------------------------------------------
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| [369] | 113 | ALIGN STRING_JUMP_ALIGN
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| [52] | 114 | String_GetLengthFromDSSItoCX:
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| 115 | push ax
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| [46] | 116 | push si
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| 117 |
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| [54] | 118 | call Registers_ExchangeDSSIwithESDI
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| [52] | 119 | xor ax, ax ; Find NULL
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| 120 | mov cx, -1 ; Full segment if necessary
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| 121 | repne scasb
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| 122 | mov cx, di
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| [54] | 123 | call Registers_ExchangeDSSIwithESDI
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| [46] | 124 |
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| [52] | 125 | pop si
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| 126 | stc
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| 127 | sbb cx, si ; Subtract NULL
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| [46] | 128 | pop ax
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| 129 | ret
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