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Annotation of embedaddon/pcre/pcre16_ord2utf16.c, revision 1.1.1.1

1.1       misho       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 UTF16 string. */
                     43: 
                     44: #ifdef HAVE_CONFIG_H
                     45: #include "config.h"
                     46: #endif
                     47: 
                     48: /* Generate code with 16 bit character support. */
                     49: #define COMPILE_PCRE16
                     50: 
                     51: #include "pcre_internal.h"
                     52: 
                     53: /*************************************************
                     54: *       Convert character value to UTF-16         *
                     55: *************************************************/
                     56: 
                     57: /* This function takes an integer value in the range 0 - 0x10ffff
                     58: and encodes it as a UTF-16 character in 1 to 2 pcre_uchars.
                     59: 
                     60: Arguments:
                     61:   cvalue     the character value
                     62:   buffer     pointer to buffer for result - at least 2 pcre_uchars long
                     63: 
                     64: Returns:     number of characters placed in the buffer
                     65: */
                     66: 
                     67: int
                     68: PRIV(ord2utf)(pcre_uint32 cvalue, pcre_uchar *buffer)
                     69: {
                     70: #ifdef SUPPORT_UTF
                     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: if (cvalue <= 0xffff)
                     78:   {
                     79:   *buffer = (pcre_uchar)cvalue;
                     80:   return 1;
                     81:   }
                     82: 
                     83: cvalue -= 0x10000;
                     84: *buffer++ = 0xd800 | (cvalue >> 10);
                     85: *buffer = 0xdc00 | (cvalue & 0x3ff);
                     86: return 2;
                     87: 
                     88: #else /* SUPPORT_UTF */
                     89: (void)(cvalue);  /* Keep compiler happy; this function won't ever be */
                     90: (void)(buffer);  /* called when SUPPORT_UTF is not defined. */
                     91: return 0;
                     92: #endif /* SUPPORT_UTF */
                     93: }
                     94: 
                     95: /* End of pcre16_ord2utf16.c */