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      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      Original API code Copyright (c) 1997-2012 University of Cambridge
     10          New API code Copyright (c) 2016 University of Cambridge
     11 
     12 -----------------------------------------------------------------------------
     13 Redistribution and use in source and binary forms, with or without
     14 modification, are permitted provided that the following conditions are met:
     15 
     16     * Redistributions of source code must retain the above copyright notice,
     17       this list of conditions and the following disclaimer.
     18 
     19     * Redistributions in binary form must reproduce the above copyright
     20       notice, this list of conditions and the following disclaimer in the
     21       documentation and/or other materials provided with the distribution.
     22 
     23     * Neither the name of the University of Cambridge nor the names of its
     24       contributors may be used to endorse or promote products derived from
     25       this software without specific prior written permission.
     26 
     27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     28 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
     31 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37 POSSIBILITY OF SUCH DAMAGE.
     38 -----------------------------------------------------------------------------
     39 */
     40 
     41 
     42 /* This file contains a function that converts a Unicode character code point
     43 into a UTF string. The behaviour is different for each code unit width. */
     44 
     45 
     46 #ifdef HAVE_CONFIG_H
     47 #include "config.h"
     48 #endif
     49 
     50 #include "pcre2_internal.h"
     51 
     52 
     53 /* If SUPPORT_UNICODE is not defined, this function will never be called.
     54 Supply a dummy function because some compilers do not like empty source
     55 modules. */
     56 
     57 #ifndef SUPPORT_UNICODE
     58 unsigned int
     59 PRIV(ord2utf)(uint32_t cvalue, PCRE2_UCHAR *buffer)
     60 {
     61 (void)(cvalue);
     62 (void)(buffer);
     63 return 0;
     64 }
     65 #else  /* SUPPORT_UNICODE */
     66 
     67 
     68 /*************************************************
     69 *          Convert code point to UTF             *
     70 *************************************************/
     71 
     72 /*
     73 Arguments:
     74   cvalue     the character value
     75   buffer     pointer to buffer for result
     76 
     77 Returns:     number of code units placed in the buffer
     78 */
     79 
     80 unsigned int
     81 PRIV(ord2utf)(uint32_t cvalue, PCRE2_UCHAR *buffer)
     82 {
     83 /* Convert to UTF-8 */
     84 
     85 #if PCRE2_CODE_UNIT_WIDTH == 8
     86 register int i, j;
     87 for (i = 0; i < PRIV(utf8_table1_size); i++)
     88   if ((int)cvalue <= PRIV(utf8_table1)[i]) break;
     89 buffer += i;
     90 for (j = i; j > 0; j--)
     91  {
     92  *buffer-- = 0x80 | (cvalue & 0x3f);
     93  cvalue >>= 6;
     94  }
     95 *buffer = PRIV(utf8_table2)[i] | cvalue;
     96 return i + 1;
     97 
     98 /* Convert to UTF-16 */
     99 
    100 #elif PCRE2_CODE_UNIT_WIDTH == 16
    101 if (cvalue <= 0xffff)
    102   {
    103   *buffer = (PCRE2_UCHAR)cvalue;
    104   return 1;
    105   }
    106 cvalue -= 0x10000;
    107 *buffer++ = 0xd800 | (cvalue >> 10);
    108 *buffer = 0xdc00 | (cvalue & 0x3ff);
    109 return 2;
    110 
    111 /* Convert to UTF-32 */
    112 
    113 #else
    114 *buffer = (PCRE2_UCHAR)cvalue;
    115 return 1;
    116 #endif
    117 }
    118 #endif  /* SUPPORT_UNICODE */
    119 
    120 /* End of pcre_ord2utf.c */
    121