/*************************************************

*      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) 1997-2008 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, PCRE 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 "pcre_internal.h"

/*************************************************

*      Check for newline at given position       *

*************************************************/

/* It is guaranteed that the initial value of ptr is less than the end of the

string that is being processed.

Arguments:

  ptr          pointer to possible newline

  type         the newline type

  endptr       pointer to the end of the string

  lenptr       where to return the length

  utf8         TRUE if in utf8 mode

Returns:       TRUE or FALSE

*/

BOOL

_pcre_is_newline(const uschar *ptr, int type, const uschar *endptr,

  int *lenptr, BOOL utf8)

{

int c;

if (utf8) { GETCHAR(c, ptr); } else c = *ptr;

if (type == NLTYPE_ANYCRLF) switch(c)

  {

  case 0x000a: *lenptr = 1; return TRUE;             /* LF */

  case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;

               return TRUE;                          /* CR */

  default: return FALSE;

  }

/* NLTYPE_ANY */

else switch(c)

  {

  case 0x000a:                                       /* LF */

  case 0x000b:                                       /* VT */

  case 0x000c: *lenptr = 1; return TRUE;             /* FF */

  case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;

               return TRUE;                          /* CR */

  case 0x0085: *lenptr = utf8? 2 : 1; return TRUE;   /* NEL */

  case 0x2028:                                       /* LS */

  case 0x2029: *lenptr = 3; return TRUE;             /* PS */

  default: return FALSE;

  }

}

/*************************************************

*     Check for newline at previous position     *

*************************************************/

/* 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

  utf8         TRUE if in utf8 mode

Returns:       TRUE or FALSE

*/

BOOL

_pcre_was_newline(const uschar *ptr, int type, const uschar *startptr,

  int *lenptr, BOOL utf8)

{

int c;

ptr--;

#ifdef SUPPORT_UTF8

if (utf8)

  {

  BACKCHAR(ptr);

  GETCHAR(c, ptr);

  }

else c = *ptr;

#else   /* no UTF-8 support */

c = *ptr;

#endif  /* SUPPORT_UTF8 */

if (type == NLTYPE_ANYCRLF) switch(c)

  {

  case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;

               return TRUE;                         /* LF */

  case 0x000d: *lenptr = 1; return TRUE;            /* CR */

  default: return FALSE;

  }

else switch(c)

  {

  case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;

               return TRUE;                         /* LF */

  case 0x000b:                                      /* VT */

  case 0x000c:                                      /* FF */

  case 0x000d: *lenptr = 1; return TRUE;            /* CR */

  case 0x0085: *lenptr = utf8? 2 : 1; return TRUE;  /* NEL */

  case 0x2028:                                      /* LS */

  case 0x2029: *lenptr = 3; return TRUE;            /* PS */

  default: return FALSE;

  }

}

/* End of pcre_newline.c */