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Annotation of embedaddon/libiconv/lib/ucs4swapped.h, revision 1.1.1.2

1.1       misho       1: /*
1.1.1.2 ! misho       2:  * Copyright (C) 1999-2000, 2016 Free Software Foundation, Inc.
1.1       misho       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.
1.1.1.2 ! misho      17:  * If not, see <https://www.gnu.org/licenses/>.
1.1       misho      18:  */
                     19: 
                     20: /*
                     21:  * UCS-4-SWAPPED = UCS-4-INTERNAL with inverted endianness
                     22:  */
                     23: 
                     24: static int
1.1.1.2 ! misho      25: ucs4swapped_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
1.1       misho      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
1.1.1.2 ! misho      40: ucs4swapped_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
1.1       misho      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: }