244 lines
6.4 KiB
C
244 lines
6.4 KiB
C
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/*************************************************
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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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Original API code Copyright (c) 1997-2012 University of Cambridge
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New API code Copyright (c) 2016 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 internal functions for testing newlines when more than
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one kind of newline is to be recognized. When a newline is found, its length is
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returned. In principle, we could implement several newline "types", each
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referring to a different set of newline characters. At present, PCRE2 supports
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only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
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and NLTYPE_ANY. The full list of Unicode newline characters is taken from
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http://unicode.org/unicode/reports/tr18/. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "pcre2_internal.h"
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/*************************************************
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* Check for newline at given position *
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*************************************************/
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/* This function is called only via the IS_NEWLINE macro, which does so only
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when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed
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newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the code unit
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pointed to by ptr is less than the end of the string.
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Arguments:
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ptr pointer to possible newline
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type the newline type
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endptr pointer to the end of the string
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lenptr where to return the length
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utf TRUE if in utf mode
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Returns: TRUE or FALSE
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*/
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BOOL
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PRIV(is_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR endptr,
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uint32_t *lenptr, BOOL utf)
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{
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uint32_t c;
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#ifdef SUPPORT_UNICODE
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if (utf) { GETCHAR(c, ptr); } else c = *ptr;
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#else
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(void)utf;
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c = *ptr;
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#endif /* SUPPORT_UNICODE */
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if (type == NLTYPE_ANYCRLF) switch(c)
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{
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case CHAR_LF:
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*lenptr = 1;
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return TRUE;
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case CHAR_CR:
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*lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
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return TRUE;
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default:
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return FALSE;
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}
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/* NLTYPE_ANY */
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else switch(c)
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{
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#ifdef EBCDIC
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case CHAR_NEL:
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#endif
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case CHAR_LF:
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case CHAR_VT:
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case CHAR_FF:
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*lenptr = 1;
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return TRUE;
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case CHAR_CR:
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*lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
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return TRUE;
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#ifndef EBCDIC
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#if PCRE2_CODE_UNIT_WIDTH == 8
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case CHAR_NEL:
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*lenptr = utf? 2 : 1;
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return TRUE;
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case 0x2028: /* LS */
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case 0x2029: /* PS */
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*lenptr = 3;
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return TRUE;
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#else /* 16-bit or 32-bit code units */
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case CHAR_NEL:
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case 0x2028: /* LS */
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case 0x2029: /* PS */
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*lenptr = 1;
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return TRUE;
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#endif
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#endif /* Not EBCDIC */
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default:
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return FALSE;
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}
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}
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/*************************************************
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* Check for newline at previous position *
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*************************************************/
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/* This function is called only via the WAS_NEWLINE macro, which does so only
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when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed
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newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the initial
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value of ptr is greater than the start of the string that is being processed.
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Arguments:
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ptr pointer to possible newline
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type the newline type
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startptr pointer to the start of the string
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lenptr where to return the length
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utf TRUE if in utf mode
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Returns: TRUE or FALSE
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*/
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BOOL
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PRIV(was_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR startptr,
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uint32_t *lenptr, BOOL utf)
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{
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uint32_t c;
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ptr--;
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#ifdef SUPPORT_UNICODE
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if (utf)
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{
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BACKCHAR(ptr);
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GETCHAR(c, ptr);
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}
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else c = *ptr;
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#else
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(void)utf;
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c = *ptr;
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#endif /* SUPPORT_UNICODE */
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if (type == NLTYPE_ANYCRLF) switch(c)
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{
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case CHAR_LF:
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*lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
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return TRUE;
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case CHAR_CR:
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*lenptr = 1;
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return TRUE;
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default:
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return FALSE;
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}
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/* NLTYPE_ANY */
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else switch(c)
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{
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case CHAR_LF:
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*lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
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return TRUE;
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#ifdef EBCDIC
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case CHAR_NEL:
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#endif
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case CHAR_VT:
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case CHAR_FF:
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case CHAR_CR:
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*lenptr = 1;
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return TRUE;
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#ifndef EBCDIC
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#if PCRE2_CODE_UNIT_WIDTH == 8
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case CHAR_NEL:
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*lenptr = utf? 2 : 1;
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return TRUE;
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case 0x2028: /* LS */
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case 0x2029: /* PS */
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*lenptr = 3;
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return TRUE;
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#else /* 16-bit or 32-bit code units */
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case CHAR_NEL:
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case 0x2028: /* LS */
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case 0x2029: /* PS */
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*lenptr = 1;
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return TRUE;
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#endif
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#endif /* Not EBCDIC */
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default:
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return FALSE;
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}
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}
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/* End of pcre2_newline.c */
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