/[pcre]/code/trunk/pcre32_valid_utf32.c
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Contents of /code/trunk/pcre32_valid_utf32.c

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Revision 1055 - (show annotations)
Tue Oct 16 15:53:30 2012 UTC (7 years, 1 month ago) by chpe
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pcre32: Add 32-bit library

Create libpcre32 that operates on 32-bit characters (UTF-32).

This turned out to be surprisingly simple after the UTF-16 support
was introduced; mostly just extra ifdefs and adjusting and adding
some tests.
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 an internal function for validating UTF-32 character
42 strings. */
43
44
45 #ifdef HAVE_CONFIG_H
46 #include "config.h"
47 #endif
48
49 /* Generate code with 32 bit character support. */
50 #define COMPILE_PCRE32
51
52 #include "pcre_internal.h"
53
54 #define MASK (0x1fffffu)
55
56 /*************************************************
57 * Validate a UTF-32 string *
58 *************************************************/
59
60 /* This function is called (optionally) at the start of compile or match, to
61 check that a supposed UTF-32 string is actually valid. The early check means
62 that subsequent code can assume it is dealing with a valid string. The check
63 can be turned off for maximum performance, but the consequences of supplying an
64 invalid string are then undefined.
65
66 From release 8.21 more information about the details of the error are passed
67 back in the returned value:
68
69 PCRE_UTF32_ERR0 No error
70 PCRE_UTF32_ERR1 Surrogate character
71 PCRE_UTF32_ERR2 Not allowed character
72
73 Arguments:
74 string points to the string
75 length length of string, or -1 if the string is zero-terminated
76 errp pointer to an error position offset variable
77
78 Returns: = 0 if the string is a valid UTF-32 string
79 > 0 otherwise, setting the offset of the bad character
80 */
81
82 int
83 PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
84 {
85 #ifdef SUPPORT_UTF
86 register PCRE_PUCHAR p;
87 register pcre_uchar c;
88
89 if (length < 0)
90 {
91 for (p = string; *p != 0; p++);
92 length = p - string;
93 }
94
95 for (p = string; length-- > 0; p++)
96 {
97 c = *p & MASK;
98
99 if ((c & 0xfffff800u) != 0xd800u)
100 {
101 /* Normal UTF-32 code point. Neither high nor low surrogate. */
102
103 /* This is probably a 16-bit BOM. Regardless, the string is rejected. */
104 if (c == 0xfffeu)
105 {
106 *erroroffset = p - string;
107 return PCRE_UTF32_ERR2;
108 }
109 }
110 else
111 {
112 /* A surrogate */
113 *erroroffset = p - string;
114 return PCRE_UTF32_ERR1;
115 }
116 }
117
118 #else /* SUPPORT_UTF */
119 (void)(string); /* Keep picky compilers happy */
120 (void)(length);
121 #endif /* SUPPORT_UTF */
122
123 return PCRE_UTF32_ERR0; /* This indicates success */
124 }
125
126 /* End of pcre32_valid_utf32.c */

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