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Annotation of embedaddon/pcre/pcre32_valid_utf32.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) 1997-2013 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 module contains an internal function for validating UTF-32 character
                     42: strings. */
                     43: 
                     44: 
                     45: #ifdef HAVE_CONFIG_H
                     46: #include "config.h"
                     47: #endif
                     48: 
                     49: /* Generate code with 32 bit character support. */
                     50: #define COMPILE_PCRE32
                     51: 
                     52: #include "pcre_internal.h"
                     53: 
                     54: /*************************************************
                     55: *         Validate a UTF-32 string                *
                     56: *************************************************/
                     57: 
                     58: /* This function is called (optionally) at the start of compile or match, to
                     59: check that a supposed UTF-32 string is actually valid. The early check means
                     60: that subsequent code can assume it is dealing with a valid string. The check
                     61: can be turned off for maximum performance, but the consequences of supplying an
                     62: invalid string are then undefined.
                     63: 
                     64: More information about the details of the error are passed
                     65: back in the returned value:
                     66: 
                     67: PCRE_UTF32_ERR0  No error
                     68: PCRE_UTF32_ERR1  Surrogate character
                     69: PCRE_UTF32_ERR2  Unused (was non-character)
                     70: PCRE_UTF32_ERR3  Character > 0x10ffff
                     71: 
                     72: Arguments:
                     73:   string       points to the string
                     74:   length       length of string, or -1 if the string is zero-terminated
                     75:   errp         pointer to an error position offset variable
                     76: 
                     77: Returns:       = 0    if the string is a valid UTF-32 string
                     78:                > 0    otherwise, setting the offset of the bad character
                     79: */
                     80: 
                     81: int
                     82: PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
                     83: {
                     84: #ifdef SUPPORT_UTF
                     85: register PCRE_PUCHAR p;
                     86: register pcre_uchar c;
                     87: 
                     88: if (length < 0)
                     89:   {
                     90:   for (p = string; *p != 0; p++);
                     91:   length = p - string;
                     92:   }
                     93: 
                     94: for (p = string; length-- > 0; p++)
                     95:   {
                     96:   c = *p;
                     97: 
                     98:   if ((c & 0xfffff800u) != 0xd800u)
                     99:     {
                    100:     /* Normal UTF-32 code point. Neither high nor low surrogate. */
                    101:     if (c > 0x10ffffu)
                    102:       {
                    103:       *erroroffset = p - string;
                    104:       return PCRE_UTF32_ERR3;
                    105:       }
                    106:     }
                    107:   else
                    108:     {
                    109:     /* A surrogate */
                    110:     *erroroffset = p - string;
                    111:     return PCRE_UTF32_ERR1;
                    112:     }
                    113:   }
                    114: 
                    115: #else  /* SUPPORT_UTF */
                    116: (void)(string);  /* Keep picky compilers happy */
                    117: (void)(length);
                    118: (void)(erroroffset);
                    119: #endif /* SUPPORT_UTF */
                    120: 
                    121: return PCRE_UTF32_ERR0;   /* This indicates success */
                    122: }
                    123: 
                    124: /* End of pcre32_valid_utf32.c */