NCBI C++ Toolkit Cross Reference

C++/src/util/regexp/pcre_ord2utf8.c

  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) 1997-2008 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 - 0x7fffffff
 56 and encodes it as a UTF-8 character in 0 to 6 bytes.
 57 
 58 Arguments:
 59   cvalue     the character value
 60   buffer     pointer to buffer for result - at least 6 bytes long
 61 
 62 Returns:     number of characters placed in the buffer
 63 */
 64 
 65 int
 66 _pcre_ord2utf8(int cvalue, uschar *buffer)
 67 {
 68 #ifdef SUPPORT_UTF8
 69 register int i, j;
 70 for (i = 0; i < _pcre_utf8_table1_size; i++)
 71   if (cvalue <= _pcre_utf8_table1[i]) break;
 72 buffer += i;
 73 for (j = i; j > 0; j--)
 74  {
 75  *buffer-- = 0x80 | (cvalue & 0x3f);
 76  cvalue >>= 6;
 77  }
 78 *buffer = _pcre_utf8_table2[i] | cvalue;
 79 return i + 1;
 80 #else
 81 (void)(cvalue);  /* Keep compiler happy; this function won't ever be */
 82 (void)(buffer);  /* called when SUPPORT_UTF8 is not defined. */
 83 return 0;
 84 #endif
 85 }
 86 
 87 /* End of pcre_ord2utf8.c */
 88
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