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pcre

    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 file contains a private PCRE function that converts an ordinal
   42: character value into a UTF8 string. */
   43: 
   44: #ifdef HAVE_CONFIG_H
   45: #include "config.h"
   46: #endif
   47: 
   48: #include "pcre_internal.h"
   49: 
   50: 
   51: /*************************************************
   52: *       Convert character value to UTF-8         *
   53: *************************************************/
   54: 
   55: /* This function takes an integer value in the range 0 - 0x10ffff
   56: and encodes it as a UTF-8 character in 1 to 6 pcre_uchars.
   57: 
   58: Arguments:
   59:   cvalue     the character value
   60:   buffer     pointer to buffer for result - at least 6 pcre_uchars long
   61: 
   62: Returns:     number of characters placed in the buffer
   63: */
   64: 
   65: int
   66: PRIV(ord2utf)(pcre_uint32 cvalue, pcre_uchar *buffer)
   67: {
   68: #ifdef SUPPORT_UTF
   69: 
   70: register int i, j;
   71: 
   72: /* Checking invalid cvalue character, encoded as invalid UTF-16 character.
   73: Should never happen in practice. */
   74: if ((cvalue & 0xf800) == 0xd800 || cvalue >= 0x110000)
   75:   cvalue = 0xfffe;
   76: 
   77: for (i = 0; i < PRIV(utf8_table1_size); i++)
   78:   if ((int)cvalue <= PRIV(utf8_table1)[i]) break;
   79: buffer += i;
   80: for (j = i; j > 0; j--)
   81:  {
   82:  *buffer-- = 0x80 | (cvalue & 0x3f);
   83:  cvalue >>= 6;
   84:  }
   85: *buffer = PRIV(utf8_table2)[i] | cvalue;
   86: return i + 1;
   87: 
   88: #else
   89: 
   90: (void)(cvalue);  /* Keep compiler happy; this function won't ever be */
   91: (void)(buffer);  /* called when SUPPORT_UTF is not defined. */
   92: return 0;
   93: 
   94: #endif
   95: }
   96: 
   97: /* End of pcre_ord2utf8.c */