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Annotation of embedaddon/pcre/pcre16_utf16_utils.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) 1997-2012 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 module contains a function for converting any UTF-16 character
        !            42: strings to host byte order. */
        !            43: 
        !            44: 
        !            45: #ifdef HAVE_CONFIG_H
        !            46: #include "config.h"
        !            47: #endif
        !            48: 
        !            49: /* Generate code with 16 bit character support. */
        !            50: #define COMPILE_PCRE16
        !            51: 
        !            52: #include "pcre_internal.h"
        !            53: 
        !            54: /*************************************************
        !            55: *  Convert any UTF-16 string to host byte order  *
        !            56: *************************************************/
        !            57: 
        !            58: /* This function takes an UTF-16 string and converts
        !            59: it to host byte order. The length can be explicitly set,
        !            60: or automatically detected for zero terminated strings.
        !            61: BOMs can be kept or discarded during the conversion.
        !            62: Conversion can be done in place (output == input).
        !            63: 
        !            64: Arguments:
        !            65:   output     the output buffer, its size must be greater
        !            66:              or equal than the input string
        !            67:   input      any UTF-16 string
        !            68:   length     the number of 16-bit units in the input string
        !            69:              can be less than zero for zero terminated strings
        !            70:   host_byte_order
        !            71:              A non-zero value means the input is in host byte
        !            72:              order, which can be dynamically changed by BOMs later.
        !            73:              Initially it contains the starting byte order and returns
        !            74:              with the last byte order so it can be used for stream
        !            75:              processing. It can be NULL, which set the host byte
        !            76:              order mode by default.
        !            77:   keep_boms  for a non-zero value, the BOM (0xfeff) characters
        !            78:              are copied as well
        !            79: 
        !            80: Returns:     the number of 16-bit units placed into the output buffer,
        !            81:              including the zero-terminator
        !            82: */
        !            83: 
        !            84: int
        !            85: pcre16_utf16_to_host_byte_order(PCRE_UCHAR16 *output, PCRE_SPTR16 input,
        !            86:   int length, int *host_byte_order, int keep_boms)
        !            87: {
        !            88: #ifdef SUPPORT_UTF
        !            89: /* This function converts any UTF-16 string to host byte order and optionally
        !            90: removes any Byte Order Marks (BOMS). Returns with the remainig length. */
        !            91: int host_bo = host_byte_order != NULL ? *host_byte_order : 1;
        !            92: pcre_uchar *optr = (pcre_uchar *)output;
        !            93: const pcre_uchar *iptr = (const pcre_uchar *)input;
        !            94: const pcre_uchar *end;
        !            95: /* The c variable must be unsigned. */
        !            96: register pcre_uchar c;
        !            97: 
        !            98: if (length < 0)
        !            99:   length = STRLEN_UC(iptr) + 1;
        !           100: end = iptr + length;
        !           101: 
        !           102: while (iptr < end)
        !           103:   {
        !           104:   c = *iptr++;
        !           105:   if (c == 0xfeff || c == 0xfffe)
        !           106:     {
        !           107:     /* Detecting the byte order of the machine is unnecessary, it is
        !           108:     enough to know that the UTF-16 string has the same byte order or not. */
        !           109:     host_bo = c == 0xfeff;
        !           110:     if (keep_boms != 0)
        !           111:       *optr++ = 0xfeff;
        !           112:     else
        !           113:       length--;
        !           114:     }
        !           115:   else
        !           116:     *optr++ = host_bo ? c : ((c >> 8) | (c << 8)); /* Flip bytes if needed. */
        !           117:   }
        !           118: if (host_byte_order != NULL)
        !           119:   *host_byte_order = host_bo;
        !           120: 
        !           121: #else /* SUPPORT_UTF */
        !           122: (void)(output);  /* Keep picky compilers happy */
        !           123: (void)(input);
        !           124: (void)(keep_boms);
        !           125: #endif /* SUPPORT_UTF */
        !           126: return length;
        !           127: }
        !           128: 
        !           129: /* End of pcre16_utf16_utils.c */