| 1 | ; Project name : Assembly Library
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| 2 | ; Description : Functions for processing characters in a string.
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| 3 |
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| 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 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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| 12 | ;
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| 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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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 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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| 24 | ; Character processing callback function prototype for StringProcess_DSSIwithFunctionInDX.
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| 25 | ; Parameters:
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| 26 | ; AL: Character to process
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| 27 | ; CX: Character number (index for next character)
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| 28 | ; DS:SI: Ptr to next character
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| 29 | ; BX,DI,ES: Free to use by processing function
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| 30 | ; Returns:
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| 31 | ; CF: Clear to continue with next character
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| 32 | ; Set to stop processing
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| 33 | ; BX,DI,ES: Free to use by processing function
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| 34 | ; Corrupts registers:
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| 35 | ; AX
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| 36 | ;--------------------------------------------------------------------
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| 37 |
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| 38 |
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| 39 | ;--------------------------------------------------------------------
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| 40 | ; StringProcess_DSSIwithFunctionInDX
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| 41 | ; Parameters:
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| 42 | ; DX: Character processing function
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| 43 | ; DS:SI: Ptr to NULL terminated string to convert
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| 44 | ; Returns:
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| 45 | ; CX: Number of characters processed
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| 46 | ; CF: Clear if all characters processed
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| 47 | ; Set if terminated by processing function
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| 48 | ; Corrupts registers:
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| 49 | ; Nothing (processing function can corrupt BX,DI,ES)
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| 50 | ;--------------------------------------------------------------------
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| 51 | ALIGN STRING_JUMP_ALIGN
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| 52 | StringProcess_DSSIwithFunctionInDX:
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| 53 | push si
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| 54 | push ax
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| 55 |
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| 56 | xor cx, cx
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| 57 | ALIGN STRING_JUMP_ALIGN
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| 58 | .ProcessNextCharacter:
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| 59 | lodsb
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| 60 | test al, al ; NULL to end string
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| 61 | jz SHORT .EndOfString ; Return with CF cleared
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| 62 | inc cx
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| 63 | call dx
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| 64 | jnc SHORT .ProcessNextCharacter
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| 65 |
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| 66 | ALIGN STRING_JUMP_ALIGN
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| 67 | .EndOfString:
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| 68 | pop ax
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| 69 | pop si
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| 70 | ret
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| 71 |
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| 72 |
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| 73 | ;--------------------------------------------------------------------
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| 74 | ; StringProcess_ConvertToLowerCase (callback function for StringProcess_DSSIwithFunctionInDX)
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| 75 | ; Parameters:
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| 76 | ; AL: Character to convert to lower case
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| 77 | ; DS:SI: Ptr to next character
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| 78 | ; Returns:
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| 79 | ; CF: Clear to continue processing
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| 80 | ; Corrupts registers:
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| 81 | ; AL
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| 82 | ;--------------------------------------------------------------------
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| 83 | ALIGN STRING_JUMP_ALIGN
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| 84 | StringProcess_ConvertToLowerCase:
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| 85 | call Char_ALtoLowerCaseLetter
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| 86 | mov [si-1], al
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| 87 | clc
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| 88 | ret
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| 89 |
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| 90 |
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| 91 | ;--------------------------------------------------------------------
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| 92 | ; StringProcess_ConvertToWordInDIWithBaseInBX (callback function for StringProcess_DSSIwithFunctionInDX)
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| 93 | ; Parameters:
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| 94 | ; AL: Character to convert to lower case
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| 95 | ; BX: Numeric base (2, 10 or 16)
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| 96 | ; Returns:
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| 97 | ; CF: Clear to continue processing
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| 98 | ; Set if error
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| 99 | ; Corrupts registers:
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| 100 | ; AX
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| 101 | ;--------------------------------------------------------------------
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| 102 | ALIGN STRING_JUMP_ALIGN
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| 103 | StringProcess_ConvertToWordInDIWithBaseInBX:
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| 104 | call Char_ConvertIntegerToALfromDigitInALwithBaseInBX
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| 105 | cmc
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| 106 | jc SHORT .InvalidCharacter
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| 107 | push dx
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| 108 |
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| 109 | xor ah, ah ; Digit converted to integer now in AX
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| 110 | xchg ax, di
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| 111 | mul bx ; Old WORD *= base
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| 112 | jc SHORT .Overflow
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| 113 | add di, ax ; Add old WORD to new integer
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| 114 |
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| 115 | .Overflow:
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| 116 | pop dx
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| 117 | .InvalidCharacter:
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| 118 | ret
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