/[pcre]/code/branches/pcre16/pcre16_utf16_utils.c
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Contents of /code/branches/pcre16/pcre16_utf16_utils.c

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Revision 794 - (show annotations) (download)
Thu Dec 8 07:36:41 2011 UTC (2 years, 9 months ago) by zherczeg
File MIME type: text/plain
File size: 4354 byte(s)
Adding --enable-utf option rather than --enable-utf16. --enable-utf8 is kept for compatibility reasons. And fixing other, minor issues.
1 /*************************************************
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 /* Generate code with 16 bit character support. */
50 #define COMPILE_PCRE16
51
52 #include "pcre_internal.h"
53
54 /*************************************************
55 * Convert any UTF-16 string to host byte order *
56 *************************************************/
57
58 /* This function takes an UTF-16 string and converts
59 it to host byte order. The length can be explicitly set,
60 or autmatically detected for zero terminated strings.
61 BOMs can be kept or discarded during the conversion.
62 Conversion can be done in place (output == input).
63
64 Arguments:
65 output the output buffer, its size must be greater
66 or equal than the input string
67 input any UTF-16 string
68 length the number of characters in the input string
69 can be less than zero for zero terminated strings
70 keep_boms for a non-zero value, the BOM (0xfeff) characters
71 are copied as well
72
73 Returns: the number of characters placed into the output buffer,
74 including the zero-terminator
75 */
76
77 int
78 pcre16_utf16_to_host_byte_order(PCRE_SCHAR16 *output, PCRE_SPTR16 input, int length, int keep_boms)
79 {
80 #ifdef SUPPORT_UTF
81 /* This function converts any UTF-16 string to host byte order and optionally removes
82 any Byte Order Marks (BOMS). Returns with the remainig length. */
83 BOOL same_bo = TRUE;
84 pcre_uchar *optr = (pcre_uchar *)output;
85 const pcre_uchar *iptr = (const pcre_uchar *)input;
86 const pcre_uchar *end;
87 /* The c variable must be unsigned. */
88 register pcre_uchar c;
89
90 if (length < 0)
91 length = STRLEN_UC(iptr) + 1;
92 end = iptr + length;
93
94 while (iptr < end)
95 {
96 c = *iptr++;
97 if (c == 0xfeff || c == 0xfffe)
98 {
99 /* Detecting the byte order of the machine is unnecessary, it is
100 enough to know that the UTF-16 string has the same byte order or not. */
101 same_bo = c == 0xfeff;
102 if (keep_boms != 0)
103 *optr++ = 0xfeff;
104 else
105 length--;
106 }
107 else
108 *optr++ = same_bo ? c : ((c >> 8) | (c << 8)); /* Flip bytes if needed. */
109 }
110
111 #else /* SUPPORT_UTF */
112 (void)(output); /* Keep picky compilers happy */
113 (void)(input);
114 (void)(keep_boms);
115 #endif /* SUPPORT_UTF */
116 return length;
117 }
118
119 /* End of pcre16_utf16_utils.c */

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