source: xtideuniversalbios/trunk/Assembly_Library/Src/String/String.asm@ 375

Last change on this file since 375 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: 2.8 KB
Line 
1; Project name : Assembly Library
2; Description : Functions for handling characters.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; String_ConvertDSSItoLowerCase
9; Parameters:
10; DS:SI: Ptr to string to convert
11; Returns:
12; CX: Number of characters processed
13; SI: Updated
14; Corrupts registers:
15; Nothing
16;--------------------------------------------------------------------
17ALIGN STRING_JUMP_ALIGN
18String_ConvertDSSItoLowerCase:
19 push dx
20 push ax
21
22 mov dx, StringProcess_ConvertToLowerCase
23 call StringProcess_DSSIwithFunctionInDX
24
25 pop ax
26 pop dx
27 ret
28
29
30;--------------------------------------------------------------------
31; String_ConvertWordToAXfromStringInDSSIwithBaseInBX
32; Parameters:
33; BX: Numeric base (10 or 16)
34; DS:SI: Ptr to string to convert
35; Returns:
36; AX: Word converted from string
37; CX: Number of characters processed
38; SI: Updated
39; CF: Cleared if successful
40; Set if error during conversion
41; Corrupts registers:
42; Nothing
43;--------------------------------------------------------------------
44ALIGN STRING_JUMP_ALIGN
45String_ConvertWordToAXfromStringInDSSIwithBaseInBX:
46 push di
47 push dx
48
49 xor di, di
50 mov dx, StringProcess_ConvertToWordInDIWithBaseInBX
51 call StringProcess_DSSIwithFunctionInDX
52 xchg ax, di
53
54 pop dx
55 pop di
56 ret
57
58
59;--------------------------------------------------------------------
60; String_CopyDSSItoESDIandGetLengthToCX
61; Parameters:
62; DS:SI: Ptr to source NULL terminated string
63; ES:DI: Ptr to destination buffer
64; Returns:
65; CX: Number of characters copied
66; SI,DI: Updated by CX characters
67; Corrupts registers:
68; Nothing
69;--------------------------------------------------------------------
70ALIGN STRING_JUMP_ALIGN
71String_CopyDSSItoESDIandGetLengthToCX:
72 push ax
73
74 xor cx, cx
75ALIGN STRING_JUMP_ALIGN
76.CopyNextCharacter:
77 lodsb ; Load from DS:SI to AL
78 test al, al ; NULL to end string?
79 jz SHORT .EndOfString
80 stosb ; Store from AL to ES:DI
81 inc cx ; Increment number of characters written
82 jmp SHORT .CopyNextCharacter
83
84ALIGN STRING_JUMP_ALIGN
85.EndOfString:
86 pop ax
87 ret
88
89
90;--------------------------------------------------------------------
91; String_GetLengthFromDSSItoCX
92; Parameters:
93; DS:SI: Ptr to NULL terminated string
94; Returns:
95; CX: String length in characters
96; Corrupts registers:
97; Nothing
98;--------------------------------------------------------------------
99ALIGN STRING_JUMP_ALIGN
100String_GetLengthFromDSSItoCX:
101 push ax
102 push si
103
104 call Registers_ExchangeDSSIwithESDI
105 xor ax, ax ; Find NULL
106 mov cx, -1 ; Full segment if necessary
107 repne scasb
108 mov cx, di
109 call Registers_ExchangeDSSIwithESDI
110
111 pop si
112 stc
113 sbb cx, si ; Subtract NULL
114 pop ax
115 ret
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