/[pcre]/code/trunk/pcre16_ord2utf16.c
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Contents of /code/trunk/pcre16_ord2utf16.c

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Revision 836 - (hide annotations) (download)
Wed Dec 28 17:16:11 2011 UTC (2 years, 6 months ago) by ph10
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Merging all the changes from the pcre16 branch into the trunk.

1 zherczeg 781 /*************************************************
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 ph10 830 Copyright (c) 1997-2012 University of Cambridge
10 zherczeg 781
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 file contains a private PCRE function that converts an ordinal
42     character value into a UTF16 string. */
43    
44     #ifdef HAVE_CONFIG_H
45     #include "config.h"
46     #endif
47    
48 zherczeg 782 /* Generate code with 16 bit character support. */
49     #define COMPILE_PCRE16
50    
51 zherczeg 781 #include "pcre_internal.h"
52    
53     /*************************************************
54     * Convert character value to UTF-16 *
55     *************************************************/
56    
57     /* This function takes an integer value in the range 0 - 0x10ffff
58     and encodes it as a UTF-16 character in 1 to 2 pcre_uchars.
59    
60     Arguments:
61     cvalue the character value
62     buffer pointer to buffer for result - at least 2 pcre_uchars long
63    
64     Returns: number of characters placed in the buffer
65     */
66    
67     int
68     PRIV(ord2utf)(pcre_uint32 cvalue, pcre_uchar *buffer)
69     {
70 zherczeg 794 #ifdef SUPPORT_UTF
71 zherczeg 781
72     /* Checking invalid cvalue character, encoded as invalid UTF-16 character.
73     Should never happen in practice. */
74     if ((cvalue & 0xf800) == 0xd800 || cvalue >= 0x110000)
75     cvalue = 0xfffe;
76    
77     if (cvalue <= 0xffff)
78     {
79     *buffer = (pcre_uchar)cvalue;
80     return 1;
81     }
82    
83     cvalue -= 0x10000;
84     *buffer++ = 0xd800 | (cvalue >> 10);
85     *buffer = 0xdc00 | (cvalue & 0x3ff);
86     return 2;
87    
88 zherczeg 794 #else /* SUPPORT_UTF */
89 zherczeg 781 (void)(cvalue); /* Keep compiler happy; this function won't ever be */
90 zherczeg 795 (void)(buffer); /* called when SUPPORT_UTF is not defined. */
91 zherczeg 781 return 0;
92 zherczeg 794 #endif /* SUPPORT_UTF */
93 zherczeg 781 }
94    
95     /* End of pcre16_ord2utf16.c */

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