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Member "tin-2.4.1/pcre/pcre_xclass.c" (28 Aug 2013, 4607 Bytes) of archive /linux/misc/tin-2.4.1.tar.gz:


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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) 1997-2006 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 an internal function that is used to match an extended
   42 class (one that contains characters whose values are > 255). It is used by both
   43 pcre_exec() and pcre_def_exec(). */
   44 
   45 
   46 #include "pcre_internal.h"
   47 
   48 
   49 /*************************************************
   50 *       Match character against an XCLASS        *
   51 *************************************************/
   52 
   53 /* This function is called to match a character against an extended class that
   54 might contain values > 255.
   55 
   56 Arguments:
   57   c           the character
   58   data        points to the flag byte of the XCLASS data
   59 
   60 Returns:      TRUE if character matches, else FALSE
   61 */
   62 
   63 BOOL
   64 _pcre_xclass(int c, const uschar *data)
   65 {
   66 int t;
   67 BOOL negated = (*data & XCL_NOT) != 0;
   68 
   69 /* Character values < 256 are matched against a bitmap, if one is present. If
   70 not, we still carry on, because there may be ranges that start below 256 in the
   71 additional data. */
   72 
   73 if (c < 256)
   74   {
   75   if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
   76     return !negated;   /* char found */
   77   }
   78 
   79 /* First skip the bit map if present. Then match against the list of Unicode
   80 properties or large chars or ranges that end with a large char. We won't ever
   81 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
   82 
   83 if ((*data++ & XCL_MAP) != 0) data += 32;
   84 
   85 while ((t = *data++) != XCL_END)
   86   {
   87   int x, y;
   88   if (t == XCL_SINGLE)
   89     {
   90     GETCHARINC(x, data);
   91     if (c == x) return !negated;
   92     }
   93   else if (t == XCL_RANGE)
   94     {
   95     GETCHARINC(x, data);
   96     GETCHARINC(y, data);
   97     if (c >= x && c <= y) return !negated;
   98     }
   99 
  100 #ifdef SUPPORT_UCP
  101   else  /* XCL_PROP & XCL_NOTPROP */
  102     {
  103     int chartype, script;
  104     int category = _pcre_ucp_findprop(c, &chartype, &script);
  105 
  106     switch(*data)
  107       {
  108       case PT_ANY:
  109       if (t == XCL_PROP) return !negated;
  110       break;
  111 
  112       case PT_LAMP:
  113       if ((chartype == ucp_Lu || chartype == ucp_Ll || chartype == ucp_Lt) ==
  114           (t == XCL_PROP)) return !negated;
  115       break;
  116 
  117       case PT_GC:
  118       if ((data[1] == category) == (t == XCL_PROP)) return !negated;
  119       break;
  120 
  121       case PT_PC:
  122       if ((data[1] == chartype) == (t == XCL_PROP)) return !negated;
  123       break;
  124 
  125       case PT_SC:
  126       if ((data[1] == script) == (t == XCL_PROP)) return !negated;
  127       break;
  128 
  129       /* This should never occur, but compilers may mutter if there is no
  130       default. */
  131 
  132       default:
  133       return FALSE;
  134       }
  135 
  136     data += 2;
  137     }
  138 #endif  /* SUPPORT_UCP */
  139   }
  140 
  141 return negated;   /* char did not match */
  142 }
  143 
  144 /* End of pcre_xclass.c */