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Contents of /code/trunk/pcre16_utf16_utils.c

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Revision 830 - (show annotations) (download)
Tue Dec 27 15:37:13 2011 UTC (2 years, 9 months ago) by ph10
Original Path: code/branches/pcre16/pcre16_utf16_utils.c
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Update version and update many copyright dates.

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) 1997-2012 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 host_byte_order
71 A non-zero value means the input is in host byte
72 order, which can be dynamically changed by BOMs later.
73 Initially it contains the starting byte order and returns
74 with the last byte order so it can be used for stream
75 processing. It can be NULL, which set the host byte
76 order mode by default.
77 keep_boms for a non-zero value, the BOM (0xfeff) characters
78 are copied as well
79
80 Returns: the number of characters placed into the output buffer,
81 including the zero-terminator
82 */
83
84 int
85 pcre16_utf16_to_host_byte_order(PCRE_SCHAR16 *output, PCRE_SPTR16 input,
86 int length, int *host_byte_order, int keep_boms)
87 {
88 #ifdef SUPPORT_UTF
89 /* This function converts any UTF-16 string to host byte order and optionally
90 removes any Byte Order Marks (BOMS). Returns with the remainig length. */
91 int host_bo = host_byte_order != NULL ? *host_byte_order : 1;
92 pcre_uchar *optr = (pcre_uchar *)output;
93 const pcre_uchar *iptr = (const pcre_uchar *)input;
94 const pcre_uchar *end;
95 /* The c variable must be unsigned. */
96 register pcre_uchar c;
97
98 if (length < 0)
99 length = STRLEN_UC(iptr) + 1;
100 end = iptr + length;
101
102 while (iptr < end)
103 {
104 c = *iptr++;
105 if (c == 0xfeff || c == 0xfffe)
106 {
107 /* Detecting the byte order of the machine is unnecessary, it is
108 enough to know that the UTF-16 string has the same byte order or not. */
109 host_bo = c == 0xfeff;
110 if (keep_boms != 0)
111 *optr++ = 0xfeff;
112 else
113 length--;
114 }
115 else
116 *optr++ = host_bo ? c : ((c >> 8) | (c << 8)); /* Flip bytes if needed. */
117 }
118 if (host_byte_order != NULL)
119 *host_byte_order = host_bo;
120
121 #else /* SUPPORT_UTF */
122 (void)(output); /* Keep picky compilers happy */
123 (void)(input);
124 (void)(keep_boms);
125 #endif /* SUPPORT_UTF */
126 return length;
127 }
128
129 /* End of pcre16_utf16_utils.c */

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