source: xtideuniversalbios/trunk/Assembly_Library/Src/String/StringProcess.asm@ 374

Last change on this file since 374 was 369, checked in by gregli@…, 13 years ago

Removed align directives for initalization code and added define for align in boot-time calls to the assembly library (defaulting to 1), resulting in a significant savings for the AT and 386 builds. Fixed a bug with switch command line handling in the serial server. Put in CR characters in licesnse.txt, so that it properly displays on Windows. In the configurator, added default values for user supplied CHS and LBA values, defaulting to values within range when those features are enabled. Updated the copyright message in the configurator as the literal word Copyright is important.
File size: 2.9 KB
RevLine 
[52]1; Project name : Assembly Library
2; Description : Functions for processing characters in a string.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
[67]8; Character processing callback function prototype for StringProcess_DSSIwithFunctionInDX.
[52]9; Parameters:
10; AL: Character to process
[67]11; CX: Character number (index for next character)
[52]12; DS:SI: Ptr to next character
13; BX,DI,ES: Free to use by processing function
14; Returns:
15; CF: Clear to continue with next character
16; Set to stop processing
17; BX,DI,ES: Free to use by processing function
18; Corrupts registers:
19; AX
20;--------------------------------------------------------------------
21
22
23;--------------------------------------------------------------------
24; StringProcess_DSSIwithFunctionInDX
25; Parameters:
26; DX: Character processing function
27; DS:SI: Ptr to NULL terminated string to convert
28; Returns:
29; CX: Number of characters processed
30; CF: Clear if all characters processed
[162]31; Set if terminated by processing function
[52]32; Corrupts registers:
33; Nothing (processing function can corrupt BX,DI,ES)
34;--------------------------------------------------------------------
[369]35ALIGN STRING_JUMP_ALIGN
[52]36StringProcess_DSSIwithFunctionInDX:
37 push si
38 push ax
39
40 xor cx, cx
[369]41ALIGN STRING_JUMP_ALIGN
[52]42.ProcessNextCharacter:
43 lodsb
44 test al, al ; NULL to end string
45 jz SHORT .EndOfString ; Return with CF cleared
46 inc cx
47 call dx
48 jnc SHORT .ProcessNextCharacter
49
[369]50ALIGN STRING_JUMP_ALIGN
[52]51.EndOfString:
52 pop ax
53 pop si
54 ret
55
56
57;--------------------------------------------------------------------
58; StringProcess_ConvertToLowerCase (callback function for StringProcess_DSSIwithFunctionInDX)
59; Parameters:
60; AL: Character to convert to lower case
61; DS:SI: Ptr to next character
62; Returns:
63; CF: Clear to continue processing
64; Corrupts registers:
65; AL
66;--------------------------------------------------------------------
[369]67ALIGN STRING_JUMP_ALIGN
[52]68StringProcess_ConvertToLowerCase:
69 call Char_ALtoLowerCaseLetter
70 mov [si-1], al
71 clc
72 ret
73
74
75;--------------------------------------------------------------------
76; StringProcess_ConvertToWordInDIWithBaseInBX (callback function for StringProcess_DSSIwithFunctionInDX)
77; Parameters:
78; AL: Character to convert to lower case
79; BX: Numeric base (2, 10 or 16)
80; Returns:
81; CF: Clear to continue processing
82; Set if error
83; Corrupts registers:
84; AX
85;--------------------------------------------------------------------
[369]86ALIGN STRING_JUMP_ALIGN
[52]87StringProcess_ConvertToWordInDIWithBaseInBX:
88 call Char_ConvertIntegerToALfromDigitInALwithBaseInBX
[162]89 cmc
90 jc SHORT .InvalidCharacter
[52]91 push dx
92
93 xor ah, ah ; Digit converted to integer now in AX
94 xchg ax, di
95 mul bx ; Old WORD *= base
96 jc SHORT .Overflow
97 add di, ax ; Add old WORD to new integer
98
99.Overflow:
100 pop dx
101.InvalidCharacter:
102 ret
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