/*************************************************
*      Perl-Compatible Regular Expressions       *
*************************************************/

/* PCRE is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.

                       Written by Philip Hazel
           Copyright (c) 1997-2012 University of Cambridge

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    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

    * Neither the name of the University of Cambridge nor the names of its
      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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*/


/* This file contains a private PCRE function that converts an ordinal
character value into a UTF16 string. */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

/* Generate code with 16 bit character support. */
#define COMPILE_PCRE16

#include "pcre_internal.h"

/*************************************************
*       Convert character value to UTF-16         *
*************************************************/

/* This function takes an integer value in the range 0 - 0x10ffff
and encodes it as a UTF-16 character in 1 to 2 pcre_uchars.

Arguments:
  cvalue     the character value
  buffer     pointer to buffer for result - at least 2 pcre_uchars long

Returns:     number of characters placed in the buffer
*/

int
PRIV(ord2utf)(pcre_uint32 cvalue, pcre_uchar *buffer)
{
#ifdef SUPPORT_UTF

/* Checking invalid cvalue character, encoded as invalid UTF-16 character.
Should never happen in practice. */
if ((cvalue & 0xf800) == 0xd800 || cvalue >= 0x110000)
  cvalue = 0xfffe;

if (cvalue <= 0xffff)
  {
  *buffer = (pcre_uchar)cvalue;
  return 1;
  }

cvalue -= 0x10000;
*buffer++ = 0xd800 | (cvalue >> 10);
*buffer = 0xdc00 | (cvalue & 0x3ff);
return 2;

#else /* SUPPORT_UTF */
(void)(cvalue);  /* Keep compiler happy; this function won't ever be */
(void)(buffer);  /* called when SUPPORT_UTF is not defined. */
return 0;
#endif /* SUPPORT_UTF */
}

/* End of pcre16_ord2utf16.c */
