/*************************************************
*      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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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
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*/


/* This file contains a private PCRE function that converts an ordinal
character value into a UTF8 string. */

#include "config.h"

#include "pcre_internal.h"


/*************************************************
*       Convert character value to UTF-8         *
*************************************************/

/* This function takes an integer value in the range 0 - 0x10ffff
and encodes it as a UTF-8 character in 1 to 6 pcre_uchars.

Arguments:
  cvalue     the character value
  buffer     pointer to buffer for result - at least 6 pcre_uchars long

Returns:     number of characters placed in the buffer
*/

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

int i, j;

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

for (i = 0; i < PRIV(utf8_table1_size); i++)
  if ((int)cvalue <= PRIV(utf8_table1)[i]) break;
buffer += i;
for (j = i; j > 0; j--)
 {
 *buffer-- = 0x80 | (cvalue & 0x3f);
 cvalue >>= 6;
 }
*buffer = PRIV(utf8_table2)[i] | cvalue;
return i + 1;

#else

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

#endif
}

/* End of pcre_ord2utf8.c */