source: xtideuniversalbios/trunk/Assembly_Library/Src/String/StringProcess.asm@ 531

Last change on this file since 531 was 526, checked in by krille_n_@…, 12 years ago

Changes:

  • Update of the copyright notices to include the year 2013.
File size: 3.6 KB
Line 
1; Project name : Assembly Library
2; Description : Functions for processing characters in a string.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License as published by
10; the Free Software Foundation; either version 2 of the License, or
11; (at your option) any later version.
12;
13; This program is distributed in the hope that it will be useful,
14; but WITHOUT ANY WARRANTY; without even the implied warranty of
15; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20; Section containing code
21SECTION .text
22
23;--------------------------------------------------------------------
24; Character processing callback function prototype for StringProcess_DSSIwithFunctionInDX.
25; Parameters:
26; AL: Character to process
27; CX: Character number (index for next character)
28; DS:SI: Ptr to next character
29; BX,DI,ES: Free to use by processing function
30; Returns:
31; CF: Clear to continue with next character
32; Set to stop processing
33; BX,DI,ES: Free to use by processing function
34; Corrupts registers:
35; AX
36;--------------------------------------------------------------------
37
38
39;--------------------------------------------------------------------
40; StringProcess_DSSIwithFunctionInDX
41; Parameters:
42; DX: Character processing function
43; DS:SI: Ptr to NULL terminated string to convert
44; Returns:
45; CX: Number of characters processed
46; CF: Clear if all characters processed
47; Set if terminated by processing function
48; Corrupts registers:
49; Nothing (processing function can corrupt BX,DI,ES)
50;--------------------------------------------------------------------
51ALIGN STRING_JUMP_ALIGN
52StringProcess_DSSIwithFunctionInDX:
53 push si
54 push ax
55
56 xor cx, cx
57ALIGN STRING_JUMP_ALIGN
58.ProcessNextCharacter:
59 lodsb
60 test al, al ; NULL to end string
61 jz SHORT .EndOfString ; Return with CF cleared
62 inc cx
63 call dx
64 jnc SHORT .ProcessNextCharacter
65
66ALIGN STRING_JUMP_ALIGN
67.EndOfString:
68 pop ax
69 pop si
70 ret
71
72
73;--------------------------------------------------------------------
74; StringProcess_ConvertToLowerCase (callback function for StringProcess_DSSIwithFunctionInDX)
75; Parameters:
76; AL: Character to convert to lower case
77; DS:SI: Ptr to next character
78; Returns:
79; CF: Clear to continue processing
80; Corrupts registers:
81; AL
82;--------------------------------------------------------------------
83ALIGN STRING_JUMP_ALIGN
84StringProcess_ConvertToLowerCase:
85 call Char_ALtoLowerCaseLetter
86 mov [si-1], al
87 clc
88 ret
89
90
91;--------------------------------------------------------------------
92; StringProcess_ConvertToWordInDIWithBaseInBX (callback function for StringProcess_DSSIwithFunctionInDX)
93; Parameters:
94; AL: Character to convert to lower case
95; BX: Numeric base (2, 10 or 16)
96; Returns:
97; CF: Clear to continue processing
98; Set if error
99; Corrupts registers:
100; AX
101;--------------------------------------------------------------------
102ALIGN STRING_JUMP_ALIGN
103StringProcess_ConvertToWordInDIWithBaseInBX:
104 call Char_ConvertIntegerToALfromDigitInALwithBaseInBX
105 cmc
106 jc SHORT .InvalidCharacter
107 push dx
108
109 xor ah, ah ; Digit converted to integer now in AX
110 xchg ax, di
111 mul bx ; Old WORD *= base
112 jc SHORT .Overflow
113 add di, ax ; Add old WORD to new integer
114
115.Overflow:
116 pop dx
117.InvalidCharacter:
118 ret
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