157 lines
4.9 KiB
C
157 lines
4.9 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Copyright (c) 1997-2012 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module contains an internal function for validating UTF-16 character
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strings. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* Generate code with 16 bit character support. */
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#define COMPILE_PCRE16
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#include "pcre_internal.h"
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/*************************************************
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* Validate a UTF-16 string *
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*************************************************/
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/* This function is called (optionally) at the start of compile or match, to
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check that a supposed UTF-16 string is actually valid. The early check means
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that subsequent code can assume it is dealing with a valid string. The check
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can be turned off for maximum performance, but the consequences of supplying an
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invalid string are then undefined.
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From release 8.21 more information about the details of the error are passed
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back in the returned value:
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PCRE_UTF16_ERR0 No error
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PCRE_UTF16_ERR1 Missing low surrogate at the end of the string
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PCRE_UTF16_ERR2 Invalid low surrogate
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PCRE_UTF16_ERR3 Isolated low surrogate
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PCRE_UTF16_ERR4 Non-character
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Arguments:
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string points to the string
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length length of string, or -1 if the string is zero-terminated
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errp pointer to an error position offset variable
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Returns: = 0 if the string is a valid UTF-16 string
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> 0 otherwise, setting the offset of the bad character
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*/
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int
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PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
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{
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#ifdef SUPPORT_UTF
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register PCRE_PUCHAR p;
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register pcre_uint32 c;
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if (length < 0)
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{
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for (p = string; *p != 0; p++);
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length = p - string;
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}
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for (p = string; length-- > 0; p++)
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{
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c = *p;
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if ((c & 0xf800) != 0xd800)
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{
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/* Normal UTF-16 code point. Neither high nor low surrogate. */
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/* Check for non-characters */
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if ((c & 0xfffeu) == 0xfffeu || (c >= 0xfdd0u && c <= 0xfdefu))
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{
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*erroroffset = p - string;
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return PCRE_UTF16_ERR4;
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}
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}
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else if ((c & 0x0400) == 0)
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{
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/* High surrogate. */
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/* Must be a followed by a low surrogate. */
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if (length == 0)
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{
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*erroroffset = p - string;
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return PCRE_UTF16_ERR1;
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}
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p++;
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length--;
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if ((*p & 0xfc00) != 0xdc00)
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{
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*erroroffset = p - string;
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return PCRE_UTF16_ERR2;
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}
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else
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{
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/* Valid surrogate, but check for non-characters */
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c = (((c & 0x3ffu) << 10) | (*p & 0x3ffu)) + 0x10000u;
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if ((c & 0xfffeu) == 0xfffeu)
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{
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*erroroffset = p - string;
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return PCRE_UTF16_ERR4;
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}
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}
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}
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else
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{
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/* Isolated low surrogate. Always an error. */
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*erroroffset = p - string;
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return PCRE_UTF16_ERR3;
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}
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}
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#else /* SUPPORT_UTF */
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(void)(string); /* Keep picky compilers happy */
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(void)(length);
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(void)(erroroffset);
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#endif /* SUPPORT_UTF */
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return PCRE_UTF16_ERR0; /* This indicates success */
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}
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/* End of pcre16_valid_utf16.c */
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