glib/pcre/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) 1997-2012 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 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 */