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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 pcre_uint32 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 /* Note that this function is called only for ANY or ANYCRLF. */
   91 
   92 if (type == NLTYPE_ANYCRLF) switch(c)
   93   {
   94   case CHAR_LF: *lenptr = 1; return TRUE;
   95   case CHAR_CR: *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
   96                return TRUE;
   97   default: return FALSE;
   98   }
   99 
  100 /* NLTYPE_ANY */
  101 
  102 else switch(c)
  103   {
  104 #ifdef EBCDIC
  105   case CHAR_NEL:
  106 #endif
  107   case CHAR_LF:
  108   case CHAR_VT:
  109   case CHAR_FF: *lenptr = 1; return TRUE;
  110 
  111   case CHAR_CR:
  112   *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
  113   return TRUE;
  114 
  115 #ifndef EBCDIC
  116 #ifdef COMPILE_PCRE8
  117   case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
  118   case 0x2028:                                       /* LS */
  119   case 0x2029: *lenptr = 3; return TRUE;             /* PS */
  120 #else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
  121   case CHAR_NEL:
  122   case 0x2028:                                       /* LS */
  123   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
  124 #endif  /* COMPILE_PCRE8 */
  125 #endif  /* Not EBCDIC */
  126 
  127   default: return FALSE;
  128   }
  129 }
  130 
  131 
  132 
  133 /*************************************************
  134 *     Check for newline at previous position     *
  135 *************************************************/
  136 
  137 /* It is guaranteed that the initial value of ptr is greater than the start of
  138 the string that is being processed.
  139 
  140 Arguments:
  141   ptr          pointer to possible newline
  142   type         the newline type
  143   startptr     pointer to the start of the string
  144   lenptr       where to return the length
  145   utf          TRUE if in utf mode
  146 
  147 Returns:       TRUE or FALSE
  148 */
  149 
  150 BOOL
  151 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
  152   BOOL utf)
  153 {
  154 pcre_uint32 c;
  155 (void)utf;
  156 ptr--;
  157 #ifdef SUPPORT_UTF
  158 if (utf)
  159   {
  160   BACKCHAR(ptr);
  161   GETCHAR(c, ptr);
  162   }
  163 else
  164 #endif  /* SUPPORT_UTF */
  165   c = *ptr;
  166 
  167 /* Note that this function is called only for ANY or ANYCRLF. */
  168 
  169 if (type == NLTYPE_ANYCRLF) switch(c)
  170   {
  171   case CHAR_LF:
  172   *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
  173   return TRUE;
  174 
  175   case CHAR_CR: *lenptr = 1; return TRUE;
  176   default: return FALSE;
  177   }
  178 
  179 /* NLTYPE_ANY */
  180 
  181 else switch(c)
  182   {
  183   case CHAR_LF:
  184   *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
  185   return TRUE;
  186 
  187 #ifdef EBCDIC
  188   case CHAR_NEL:
  189 #endif
  190   case CHAR_VT:
  191   case CHAR_FF:
  192   case CHAR_CR: *lenptr = 1; return TRUE;
  193 
  194 #ifndef EBCDIC
  195 #ifdef COMPILE_PCRE8
  196   case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
  197   case 0x2028:                                       /* LS */
  198   case 0x2029: *lenptr = 3; return TRUE;             /* PS */
  199 #else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
  200   case CHAR_NEL:
  201   case 0x2028:                                       /* LS */
  202   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
  203 #endif  /* COMPILE_PCRE8 */
  204 #endif  /* NotEBCDIC */
  205 
  206   default: return FALSE;
  207   }
  208 }
  209 
  210 /* End of pcre_newline.c */