source: xtideuniversalbios/trunk/Assembly_Library/Src/String/String.asm@ 623

Last change on this file since 623 was 621, checked in by Krister Nordvall, 3 years ago

Changes:

  • Fixed three different bugs all causing the boot menu to show drives using IRQs even though the BIOS had been built without MODULE_IRQ.
  • Fixed two bugs in XTIDECFG where loading a BIOS from file and then loading the old settings from EEPROM would
    • overwrite ROMVARS.wFlags in the loaded BIOS file (in RAM). The possibly resulting mismatch of module flags could make it impossible to change settings for modules included in the BIOS or allow changing settings for modules not included in the BIOS.
    • not copy the color theme over to the loaded BIOS.
  • Also fixed two very minor bugs in XTIDECFG in BiosFile_LoadFileFromDSSItoRamBuffer and BiosFile_SaveRamBufferToFileInDSSI where the error handling in these routines would close whatever file handle that happened to match the error code returned by DOS in AX.
  • Made significant changes to the new flash ROM programming routines to reduce the size. Also fixed a minor bug that would cause the second verification to be skipped and return success when programming a 64 KB block of data.
  • Changed the custom BIOS build file names to the 8.3 format.
  • Changed some help strings in XTIDECFG to clarify things.
  • Other minor optimizations and fixes.
File size: 3.4 KB
Line 
1; Project name : Assembly Library
2; Description : Functions for handling characters.
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; String_ConvertDSSItoLowerCase
25; Parameters:
26; DS:SI: Ptr to string to convert
27; Returns:
28; CX: Number of characters processed
29; Corrupts registers:
30; Nothing
31;--------------------------------------------------------------------
32ALIGN STRING_JUMP_ALIGN
33String_ConvertDSSItoLowerCase:
34 push dx
35 push ax
36
37 mov dx, StringProcess_ConvertToLowerCase
38 call StringProcess_DSSIwithFunctionInDX
39
40 pop ax
41 pop dx
42 ret
43
44
45;--------------------------------------------------------------------
46; String_ConvertWordToAXfromStringInDSSIwithBaseInBX
47; Parameters:
48; BX: Numeric base (10 or 16)
49; DS:SI: Ptr to string to convert
50; Returns:
51; AX: Word converted from string
52; CX: Number of characters processed
53; CF: Cleared if successful
54; Set if error during conversion
55; Corrupts registers:
56; Nothing
57;--------------------------------------------------------------------
58ALIGN STRING_JUMP_ALIGN
59String_ConvertWordToAXfromStringInDSSIwithBaseInBX:
60 push di
61 push dx
62
63 xor di, di
64 mov dx, StringProcess_ConvertToWordInDIWithBaseInBX
65 call StringProcess_DSSIwithFunctionInDX
66 xchg ax, di
67
68 pop dx
69 pop di
70 ret
71
72
73;--------------------------------------------------------------------
74; String_CopyDSSItoESDIandGetLengthToCX
75; Parameters:
76; DS:SI: Ptr to source NULL terminated string
77; ES:DI: Ptr to destination buffer
78; Returns:
79; CX: Number of characters copied
80; SI,DI: Updated by CX characters
81; CF: Cleared
82; Corrupts registers:
83; Nothing
84;--------------------------------------------------------------------
85ALIGN STRING_JUMP_ALIGN
86String_CopyDSSItoESDIandGetLengthToCX:
87 push ax
88
89 xor cx, cx
90ALIGN STRING_JUMP_ALIGN
91.CopyNextCharacter:
92 lodsb ; Load from DS:SI to AL
93 test al, al ; NULL to end string? (Clears CF)
94 jz SHORT PopAXandReturn
95 stosb ; Store from AL to ES:DI
96 inc cx ; Increment number of characters written
97 jmp SHORT .CopyNextCharacter
98
99
100;--------------------------------------------------------------------
101; String_GetLengthFromDSSItoCX
102; Parameters:
103; DS:SI: Ptr to NULL terminated string
104; Returns:
105; CX: String length in characters
106; Corrupts registers:
107; Nothing
108;--------------------------------------------------------------------
109ALIGN STRING_JUMP_ALIGN
110String_GetLengthFromDSSItoCX:
111 push ax
112 push si
113
114 call Registers_ExchangeDSSIwithESDI
115 xor ax, ax ; Find NULL
116 mov cx, -1 ; Full segment if necessary
117 repne scasb
118 mov cx, di
119 call Registers_ExchangeDSSIwithESDI
120
121 pop si
122 stc
123 sbb cx, si ; Subtract NULL
124PopAXandReturn:
125 pop ax
126 ret
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