code/trunk/pcre32_valid_utf32.c

/*************************************************
*      Perl-Compatible Regular Expressions       *
*************************************************/

/* PCRE is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.

                       Written by Philip Hazel
           Copyright (c) 1997-2012 University of Cambridge

-----------------------------------------------------------------------------
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

    * Neither the name of the University of Cambridge nor the names of its
      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------------
*/


/* This module contains an internal function for validating UTF-32 character
strings. */


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

/* Generate code with 32 bit character support. */
#define COMPILE_PCRE32

#include "pcre_internal.h"

/*************************************************
*         Validate a UTF-32 string                *
*************************************************/

/* This function is called (optionally) at the start of compile or match, to
check that a supposed UTF-32 string is actually valid. The early check means
that subsequent code can assume it is dealing with a valid string. The check
can be turned off for maximum performance, but the consequences of supplying an
invalid string are then undefined.

More information about the details of the error are passed
back in the returned value:

PCRE_UTF32_ERR0  No error
PCRE_UTF32_ERR1  Surrogate character
PCRE_UTF32_ERR2  Non-character
PCRE_UTF32_ERR3  Character > 0x10ffff

Arguments:
  string       points to the string
  length       length of string, or -1 if the string is zero-terminated
  errp         pointer to an error position offset variable

Returns:       = 0    if the string is a valid UTF-32 string
               > 0    otherwise, setting the offset of the bad character
*/

int
PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
{
#ifdef SUPPORT_UTF
register PCRE_PUCHAR p;
register pcre_uchar c;

if (length < 0)
  {
  for (p = string; *p != 0; p++);
  length = p - string;
  }

for (p = string; length-- > 0; p++)
  {
  c = *p;

  if ((c & 0xfffff800u) != 0xd800u)
    {
    /* Normal UTF-32 code point. Neither high nor low surrogate. */

    /* Check for non-characters */
    if ((c & 0xfffeu) == 0xfffeu || (c >= 0xfdd0u && c <= 0xfdefu))
      {
      *erroroffset = p - string;
      return PCRE_UTF32_ERR2;
      }
    else if (c > 0x10ffffu)
      {
      *erroroffset = p - string;
      return PCRE_UTF32_ERR3;
      }
    }
  else
    {
    /* A surrogate */
    *erroroffset = p - string;
    return PCRE_UTF32_ERR1;
    }
  }

#else  /* SUPPORT_UTF */
(void)(string);  /* Keep picky compilers happy */
(void)(length);
(void)(erroroffset);
#endif /* SUPPORT_UTF */

return PCRE_UTF32_ERR0;   /* This indicates success */
}

/* End of pcre32_valid_utf32.c */
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	/*************************************************
55	* Validate a UTF-32 string *
56	*************************************************/
57
58	/* This function is called (optionally) at the start of compile or match, to
59	check that a supposed UTF-32 string is actually valid. The early check means
60	that subsequent code can assume it is dealing with a valid string. The check
61	can be turned off for maximum performance, but the consequences of supplying an
62	invalid string are then undefined.
63
64	More information about the details of the error are passed
65	back in the returned value:
66
67	PCRE_UTF32_ERR0 No error
68	PCRE_UTF32_ERR1 Surrogate character
69	PCRE_UTF32_ERR2 Non-character
70	PCRE_UTF32_ERR3 Character > 0x10ffff
71
72	Arguments:
73	string points to the string
74	length length of string, or -1 if the string is zero-terminated
75	errp pointer to an error position offset variable
76
77	Returns: = 0 if the string is a valid UTF-32 string
78	> 0 otherwise, setting the offset of the bad character
79	*/
80
81	int
82	PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
83	{
84	#ifdef SUPPORT_UTF
85	register PCRE_PUCHAR p;
86	register pcre_uchar c;
87
88	if (length < 0)
89	{
90	for (p = string; *p != 0; p++);
91	length = p - string;
92	}
93
94	for (p = string; length-- > 0; p++)
95	{
96	c = *p;
97
98	if ((c & 0xfffff800u) != 0xd800u)
99	{
100	/* Normal UTF-32 code point. Neither high nor low surrogate. */
101
102	/* Check for non-characters */
103	if ((c & 0xfffeu) == 0xfffeu \|\| (c >= 0xfdd0u && c <= 0xfdefu))
104	{
105	*erroroffset = p - string;
106	return PCRE_UTF32_ERR2;
107	}
108	else if (c > 0x10ffffu)
109	{
110	*erroroffset = p - string;
111	return PCRE_UTF32_ERR3;
112	}
113	}
114	else
115	{
116	/* A surrogate */
117	*erroroffset = p - string;
118	return PCRE_UTF32_ERR1;
119	}
120	}
121
122	#else /* SUPPORT_UTF */
123	(void)(string); /* Keep picky compilers happy */
124	(void)(length);
125	(void)(erroroffset);
126	#endif /* SUPPORT_UTF */
127
128	return PCRE_UTF32_ERR0; /* This indicates success */
129	}
130
131	/* End of pcre32_valid_utf32.c */
Name	Value
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svn:keywords	"Author Date Id Revision Url"