244 lines
6.2 KiB
C
244 lines
6.2 KiB
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
|
|
Original API code Copyright (c) 1997-2012 University of Cambridge
|
|
New API code Copyright (c) 2014 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 internal functions for testing newlines when more than
|
|
one kind of newline is to be recognized. When a newline is found, its length is
|
|
returned. In principle, we could implement several newline "types", each
|
|
referring to a different set of newline characters. At present, PCRE2 supports
|
|
only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
|
|
and NLTYPE_ANY. The full list of Unicode newline characters is taken from
|
|
http://unicode.org/unicode/reports/tr18/. */
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "pcre2_internal.h"
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Check for newline at given position *
|
|
*************************************************/
|
|
|
|
/* This function is called only via the IS_NEWLINE macro, which does so only
|
|
when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed
|
|
newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the code unit
|
|
pointed to by ptr is less than the end of the string.
|
|
|
|
Arguments:
|
|
ptr pointer to possible newline
|
|
type the newline type
|
|
endptr pointer to the end of the string
|
|
lenptr where to return the length
|
|
utf TRUE if in utf mode
|
|
|
|
Returns: TRUE or FALSE
|
|
*/
|
|
|
|
BOOL
|
|
PRIV(is_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR endptr,
|
|
uint32_t *lenptr, BOOL utf)
|
|
{
|
|
uint32_t c;
|
|
|
|
#ifdef SUPPORT_UNICODE
|
|
if (utf) { GETCHAR(c, ptr); } else c = *ptr;
|
|
#else
|
|
(void)utf;
|
|
c = *ptr;
|
|
#endif /* SUPPORT_UNICODE */
|
|
|
|
if (type == NLTYPE_ANYCRLF) switch(c)
|
|
{
|
|
case CHAR_LF:
|
|
*lenptr = 1;
|
|
return TRUE;
|
|
|
|
case CHAR_CR:
|
|
*lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
|
|
return TRUE;
|
|
|
|
default:
|
|
return FALSE;
|
|
}
|
|
|
|
/* NLTYPE_ANY */
|
|
|
|
else switch(c)
|
|
{
|
|
#ifdef EBCDIC
|
|
case CHAR_NEL:
|
|
#endif
|
|
case CHAR_LF:
|
|
case CHAR_VT:
|
|
case CHAR_FF:
|
|
*lenptr = 1;
|
|
return TRUE;
|
|
|
|
case CHAR_CR:
|
|
*lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
|
|
return TRUE;
|
|
|
|
#ifndef EBCDIC
|
|
#if PCRE2_CODE_UNIT_WIDTH == 8
|
|
case CHAR_NEL:
|
|
*lenptr = utf? 2 : 1;
|
|
return TRUE;
|
|
|
|
case 0x2028: /* LS */
|
|
case 0x2029: /* PS */
|
|
*lenptr = 3;
|
|
return TRUE;
|
|
|
|
#else /* 16-bit or 32-bit code units */
|
|
case CHAR_NEL:
|
|
case 0x2028: /* LS */
|
|
case 0x2029: /* PS */
|
|
*lenptr = 1;
|
|
return TRUE;
|
|
#endif
|
|
#endif /* Not EBCDIC */
|
|
|
|
default:
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*************************************************
|
|
* Check for newline at previous position *
|
|
*************************************************/
|
|
|
|
/* This function is called only via the WAS_NEWLINE macro, which does so only
|
|
when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed
|
|
newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the initial
|
|
value of ptr is greater than the start of the string that is being processed.
|
|
|
|
Arguments:
|
|
ptr pointer to possible newline
|
|
type the newline type
|
|
startptr pointer to the start of the string
|
|
lenptr where to return the length
|
|
utf TRUE if in utf mode
|
|
|
|
Returns: TRUE or FALSE
|
|
*/
|
|
|
|
BOOL
|
|
PRIV(was_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR startptr,
|
|
uint32_t *lenptr, BOOL utf)
|
|
{
|
|
uint32_t c;
|
|
ptr--;
|
|
|
|
#ifdef SUPPORT_UNICODE
|
|
if (utf)
|
|
{
|
|
BACKCHAR(ptr);
|
|
GETCHAR(c, ptr);
|
|
}
|
|
else c = *ptr;
|
|
#else
|
|
(void)utf;
|
|
c = *ptr;
|
|
#endif /* SUPPORT_UNICODE */
|
|
|
|
if (type == NLTYPE_ANYCRLF) switch(c)
|
|
{
|
|
case CHAR_LF:
|
|
*lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
|
|
return TRUE;
|
|
|
|
case CHAR_CR:
|
|
*lenptr = 1;
|
|
return TRUE;
|
|
|
|
default:
|
|
return FALSE;
|
|
}
|
|
|
|
/* NLTYPE_ANY */
|
|
|
|
else switch(c)
|
|
{
|
|
case CHAR_LF:
|
|
*lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
|
|
return TRUE;
|
|
|
|
#ifdef EBCDIC
|
|
case CHAR_NEL:
|
|
#endif
|
|
case CHAR_VT:
|
|
case CHAR_FF:
|
|
case CHAR_CR:
|
|
*lenptr = 1;
|
|
return TRUE;
|
|
|
|
#ifndef EBCDIC
|
|
#if PCRE2_CODE_UNIT_WIDTH == 8
|
|
case CHAR_NEL:
|
|
*lenptr = utf? 2 : 1;
|
|
return TRUE;
|
|
|
|
case 0x2028: /* LS */
|
|
case 0x2029: /* PS */
|
|
*lenptr = 3;
|
|
return TRUE;
|
|
|
|
#else /* 16-bit or 32-bit code units */
|
|
case CHAR_NEL:
|
|
case 0x2028: /* LS */
|
|
case 0x2029: /* PS */
|
|
*lenptr = 1;
|
|
return TRUE;
|
|
#endif
|
|
#endif /* Not EBCDIC */
|
|
|
|
default:
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* End of pcre2_newline.c */
|