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Root/pcre/pcre_ord2utf8.c

1/*************************************************
2* Perl-Compatible Regular Expressions *
3*************************************************/
4
5/* PCRE is a library of functions to support regular expressions whose syntax
6and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2008 University of Cambridge
10
11-----------------------------------------------------------------------------
12Redistribution and use in source and binary forms, with or without
13modification, 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
26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36POSSIBILITY OF SUCH DAMAGE.
37-----------------------------------------------------------------------------
38*/
39
40
41/* This file contains a private PCRE function that converts an ordinal
42character value into a UTF8 string. */
43
44#include "pcre_config.h"
45
46#include "pcre_internal.h"
47
48
49/*************************************************
50* Convert character value to UTF-8 *
51*************************************************/
52
53/* This function takes an integer value in the range 0 - 0x7fffffff
54and encodes it as a UTF-8 character in 0 to 6 bytes.
55
56Arguments:
57 cvalue the character value
58 buffer pointer to buffer for result - at least 6 bytes long
59
60Returns: number of characters placed in the buffer
61*/
62
63int
64_pcre_ord2utf8(int cvalue, uschar *buffer)
65{
66#ifdef SUPPORT_UTF8
67register int i, j;
68for (i = 0; i < _pcre_utf8_table1_size; i++)
69 if (cvalue <= _pcre_utf8_table1[i]) break;
70buffer += i;
71for (j = i; j > 0; j--)
72 {
73 *buffer-- = 0x80 | (cvalue & 0x3f);
74 cvalue >>= 6;
75 }
76*buffer = _pcre_utf8_table2[i] | cvalue;
77return i + 1;
78#else
79return 0; /* Keep compiler happy; this function won't ever be */
80#endif /* called when SUPPORT_UTF8 is not defined. */
81}
82
83/* End of pcre_ord2utf8.c */

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