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    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 internal functions for testing newlines when more than
   42 one kind of newline is to be recognized. When a newline is found, its length is
   43 returned. In principle, we could implement several newline "types", each
   44 referring to a different set of newline characters. At present, PCRE supports
   45 only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
   46 and NLTYPE_ANY. The full list of Unicode newline characters is taken from
   47 http://unicode.org/unicode/reports/tr18/. */
   48 
   49 
   50 #ifdef HAVE_CONFIG_H
   51 #include "config.h"
   52 #endif
   53 
   54 #include "pcre_internal.h"
   55 
   56 
   57 
   58 /*************************************************
   59 *      Check for newline at given position       *
   60 *************************************************/
   61 
   62 /* It is guaranteed that the initial value of ptr is less than the end of the
   63 string that is being processed.
   64 
   65 Arguments:
   66   ptr          pointer to possible newline
   67   type         the newline type
   68   endptr       pointer to the end of the string
   69   lenptr       where to return the length
   70   utf          TRUE if in utf mode
   71 
   72 Returns:       TRUE or FALSE
   73 */
   74 
   75 BOOL
   76 PRIV(is_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR endptr, int *lenptr,
   77   BOOL utf)
   78 {
   79 int c;
   80 (void)utf;
   81 #ifdef SUPPORT_UTF
   82 if (utf)
   83   {
   84   GETCHAR(c, ptr);
   85   }
   86 else
   87 #endif  /* SUPPORT_UTF */
   88   c = *ptr;
   89 
   90 if (type == NLTYPE_ANYCRLF) switch(c)
   91   {
   92   case 0x000a: *lenptr = 1; return TRUE;             /* LF */
   93   case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
   94                return TRUE;                          /* CR */
   95   default: return FALSE;
   96   }
   97 
   98 /* NLTYPE_ANY */
   99 
  100 else switch(c)
  101   {
  102   case 0x000a:                                       /* LF */
  103   case 0x000b:                                       /* VT */
  104   case 0x000c: *lenptr = 1; return TRUE;             /* FF */
  105   case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
  106                return TRUE;                          /* CR */
  107 #ifdef COMPILE_PCRE8
  108   case 0x0085: *lenptr = utf? 2 : 1; return TRUE;    /* NEL */
  109   case 0x2028:                                       /* LS */
  110   case 0x2029: *lenptr = 3; return TRUE;             /* PS */
  111 #else
  112   case 0x0085:                                       /* NEL */
  113   case 0x2028:                                       /* LS */
  114   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
  115 #endif /* COMPILE_PCRE8 */
  116   default: return FALSE;
  117   }
  118 }
  119 
  120 
  121 
  122 /*************************************************
  123 *     Check for newline at previous position     *
  124 *************************************************/
  125 
  126 /* It is guaranteed that the initial value of ptr is greater than the start of
  127 the string that is being processed.
  128 
  129 Arguments:
  130   ptr          pointer to possible newline
  131   type         the newline type
  132   startptr     pointer to the start of the string
  133   lenptr       where to return the length
  134   utf          TRUE if in utf mode
  135 
  136 Returns:       TRUE or FALSE
  137 */
  138 
  139 BOOL
  140 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
  141   BOOL utf)
  142 {
  143 int c;
  144 (void)utf;
  145 ptr--;
  146 #ifdef SUPPORT_UTF
  147 if (utf)
  148   {
  149   BACKCHAR(ptr);
  150   GETCHAR(c, ptr);
  151   }
  152 else
  153 #endif  /* SUPPORT_UTF */
  154   c = *ptr;
  155 
  156 if (type == NLTYPE_ANYCRLF) switch(c)
  157   {
  158   case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
  159                return TRUE;                         /* LF */
  160   case 0x000d: *lenptr = 1; return TRUE;            /* CR */
  161   default: return FALSE;
  162   }
  163 
  164 else switch(c)
  165   {
  166   case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
  167                return TRUE;                         /* LF */
  168   case 0x000b:                                      /* VT */
  169   case 0x000c:                                      /* FF */
  170   case 0x000d: *lenptr = 1; return TRUE;            /* CR */
  171 #ifdef COMPILE_PCRE8
  172   case 0x0085: *lenptr = utf? 2 : 1; return TRUE;   /* NEL */
  173   case 0x2028:                                      /* LS */
  174   case 0x2029: *lenptr = 3; return TRUE;            /* PS */
  175 #else
  176   case 0x0085:                                       /* NEL */
  177   case 0x2028:                                       /* LS */
  178   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
  179 #endif /* COMPILE_PCRE8 */
  180   default: return FALSE;
  181   }
  182 }
  183 
  184 /* End of pcre_newline.c */