/[pcre]/code/trunk/pcre16_utf16_utils.c
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Contents of /code/trunk/pcre16_utf16_utils.c

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Revision 782 - (hide annotations) (download)
Sat Dec 3 23:58:37 2011 UTC (2 years, 10 months ago) by zherczeg
Original Path: code/branches/pcre16/pcre16_utf16_utils.c
File MIME type: text/plain
File size: 3275 byte(s)
Start working on UTF-16. Updating macros and adding new ones.
1 ph10 757 /*************************************************
2     * Perl-Compatible Regular Expressions *
3     *************************************************/
4    
5     /* PCRE is a library of functions to support regular expressions whose syntax
6     and semantics are as close as possible to those of the Perl 5 language.
7    
8     Written by Philip Hazel
9     Copyright (c) 1997-2009 University of Cambridge
10    
11     -----------------------------------------------------------------------------
12     Redistribution and use in source and binary forms, with or without
13     modification, are permitted provided that the following conditions are met:
14    
15     * Redistributions of source code must retain the above copyright notice,
16     this list of conditions and the following disclaimer.
17    
18     * Redistributions in binary form must reproduce the above copyright
19     notice, this list of conditions and the following disclaimer in the
20     documentation and/or other materials provided with the distribution.
21    
22     * Neither the name of the University of Cambridge nor the names of its
23     contributors may be used to endorse or promote products derived from
24     this software without specific prior written permission.
25    
26     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29     ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30     LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36     POSSIBILITY OF SUCH DAMAGE.
37     -----------------------------------------------------------------------------
38     */
39    
40    
41     /* This module contains a function for converting any UTF-16 character
42     strings to host byte order. */
43    
44    
45     #ifdef HAVE_CONFIG_H
46     #include "config.h"
47     #endif
48    
49 zherczeg 782 /* Generate code with 16 bit character support. */
50     #define COMPILE_PCRE16
51    
52 ph10 757 #include "pcre_internal.h"
53    
54     int
55     pcre16_utf16_to_host_byte_order(PCRE_SCHAR16 *output, PCRE_SPTR16 input, int length, int keep_boms)
56     {
57     #ifdef SUPPORT_UTF16
58     /* This function converts any UTF-16 string to host byte order and optionally removes
59     any Byte Order Marks (BOMS). Returns with the remainig length. */
60     BOOL same_bo = TRUE;
61     PCRE_SPTR16 end = input + length;
62     /* The c variable must be unsigned. */
63 zherczeg 781 register pcre_uchar c;
64 ph10 757
65     while (input < end)
66     {
67     c = *input++;
68     if (c == 0xfeff || c == 0xfffe)
69     {
70     /* Detecting the byte order of the machine is unnecessary, it is
71     enough to know that the UTF-16 string has the same byte order or not. */
72     same_bo = c == 0xfeff;
73     if (keep_boms != 0)
74     *output++ = 0xfeff;
75     else
76     length--;
77     }
78     else
79     *output++ = same_bo ? c : ((c >> 8) | (c << 8)); /* Flip bytes if needed. */
80     }
81    
82     #else
83     (void)(output); /* Keep picky compilers happy */
84     (void)(input);
85     (void)(keep_boms);
86     #endif
87     return length;
88     }
89    
90 zherczeg 764 /* End of pcre16_utf16_utils.c */

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