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libiconv 1.16

    1: /*
    2:  * Copyright (C) 1999-2000, 2016 Free Software Foundation, Inc.
    3:  * This file is part of the GNU LIBICONV Library.
    4:  *
    5:  * The GNU LIBICONV Library is free software; you can redistribute it
    6:  * and/or modify it under the terms of the GNU Library General Public
    7:  * License as published by the Free Software Foundation; either version 2
    8:  * of the License, or (at your option) any later version.
    9:  *
   10:  * The GNU LIBICONV Library is distributed in the hope that it will be
   11:  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:  * Library General Public License for more details.
   14:  *
   15:  * You should have received a copy of the GNU Library General Public
   16:  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   17:  * If not, see <https://www.gnu.org/licenses/>.
   18:  */
   19: 
   20: /*
   21:  * UCS-4-SWAPPED = UCS-4-INTERNAL with inverted endianness
   22:  */
   23: 
   24: static int
   25: ucs4swapped_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
   26: {
   27:   /* This function assumes that 'unsigned int' has exactly 32 bits. */
   28:   if (sizeof(unsigned int) != 4) abort();
   29: 
   30:   if (n >= 4) {
   31:     unsigned int x = *(const unsigned int *)s;
   32:     x = (x >> 24) | ((x >> 8) & 0xff00) | ((x & 0xff00) << 8) | (x << 24);
   33:     *pwc = x;
   34:     return 4;
   35:   }
   36:   return RET_TOOFEW(0);
   37: }
   38: 
   39: static int
   40: ucs4swapped_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
   41: {
   42:   /* This function assumes that 'unsigned int' has exactly 32 bits. */
   43:   if (sizeof(unsigned int) != 4) abort();
   44: 
   45:   if (n >= 4) {
   46:     unsigned int x = wc;
   47:     x = (x >> 24) | ((x >> 8) & 0xff00) | ((x & 0xff00) << 8) | (x << 24);
   48:     *(unsigned int *)r = x;
   49:     return 4;
   50:   } else
   51:     return RET_TOOSMALL;
   52: }