[52] | 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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[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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[52] | 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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[67] | 24 | ; Character processing callback function prototype for StringProcess_DSSIwithFunctionInDX. |
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[52] | 25 | ; Parameters: |
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| 26 | ; AL: Character to process |
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[67] | 27 | ; CX: Character number (index for next character) |
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[52] | 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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[162] | 47 | ; Set if terminated by processing function |
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[52] | 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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[369] | 51 | ALIGN STRING_JUMP_ALIGN |
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[52] | 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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[369] | 57 | ALIGN STRING_JUMP_ALIGN |
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[52] | 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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[369] | 66 | ALIGN STRING_JUMP_ALIGN |
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[52] | 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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[369] | 83 | ALIGN STRING_JUMP_ALIGN |
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[52] | 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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[369] | 102 | ALIGN STRING_JUMP_ALIGN |
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[52] | 103 | StringProcess_ConvertToWordInDIWithBaseInBX: |
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| 104 | call Char_ConvertIntegerToALfromDigitInALwithBaseInBX |
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[162] | 105 | cmc |
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| 106 | jc SHORT .InvalidCharacter |
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[52] | 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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