Return to pcre32_valid_utf32.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / pcre

Annotation of embedaddon/pcre/pcre32_valid_utf32.c, revision 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 */