1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/*
* $Id: search8.c,v 1.6 2003/11/25 00:45:38 prussar Exp $
*
* Viewer - a part of Plucker, the free off-line HTML viewer for PalmOS
* Copyright (c) 1998-2002, Mark Ian Lillywhite and Michael Nordstrom
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "search8.h"
/* This does the actual searching of 8 bit texts */
/* This routine is armletable, and hence is not allowed to call any
OS functions or to have any writable static data */
Char DoSearch8BitText(
Char* text, /* pointer to text to be searched */
UInt16 size, /* length of text to search */
WChar* wpattern, /* pattern to search for */
UInt16 patternLen, /* length of pattern */
Char* xlat, /* translation table for text */
UInt16* currentOffsetInTextPtr, /* current position in text */
Int16* currentOffsetInPatternPtr, /* current position in pattern */
Int16* offsetOfPlaceFoundPtr, /* pattern found starts here */
/* (equal to currentOffsetInText */
/* if not found yet) */
Boolean haveDepth /* need to recurse from here? */
)
{
Char* placeInText;
Char* placeInPattern;
Char* placeFound;
Char* endOfPattern;
Char* endOfText;
Char* pattern; /* the pattern is stored every second character */
Char ch;
pattern = 1 + (Char*) wpattern;
placeInText = text + ( *currentOffsetInTextPtr );
placeInPattern = pattern + 2 * ( *currentOffsetInPatternPtr );
placeFound = text + ( *offsetOfPlaceFoundPtr );
endOfPattern = pattern + 2 * patternLen;
endOfText = text + size;
ch = 0;
while ( placeInPattern < endOfPattern && placeInText < endOfText ) {
ch = xlat[ ( UInt8 ) *placeInText ];
if ( ! ch ) {
if ( haveDepth && placeInText[ 1 ] == 0x0A )
/* anchor: caller handles */
break;
placeInText += 2 + ( UInt8 )( placeInText[ 1 ] & 0x07 );
placeFound = placeInText;
placeInPattern = pattern;
}
else if ( ch != *placeInPattern ) {
placeInText = ++placeFound;
placeInPattern = pattern;
continue;
}
else {
placeInText++;
placeInPattern += 2;
}
}
*currentOffsetInTextPtr = placeInText - text;
*currentOffsetInPatternPtr = ( placeInPattern - pattern ) / 2;
*offsetOfPlaceFoundPtr = placeFound - text;
return ch;
}
|
