Return to ucs2.h CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libiconv / lib

libiconv 1.16

    1: /*
    2:  * Copyright (C) 1999-2001, 2008, 2011, 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-2
   22:  */
   23: 
   24: /* Here we accept FFFE/FEFF marks as endianness indicators everywhere
   25:    in the stream, not just at the beginning. The default is big-endian. */
   26: /* The state is 0 if big-endian, 1 if little-endian. */
   27: static int
   28: ucs2_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
   29: {
   30:   state_t state = conv->istate;
   31:   int count = 0;
   32:   for (; n >= 2 && count <= RET_COUNT_MAX && count <= INT_MAX-2;) {
   33:     ucs4_t wc = (state ? s[0] + (s[1] << 8) : (s[0] << 8) + s[1]);
   34:     if (wc == 0xfeff) {
   35:     } else if (wc == 0xfffe) {
   36:       state ^= 1;
   37:     } else if (wc >= 0xd800 && wc < 0xe000) {
   38:       conv->istate = state;
   39:       return RET_SHIFT_ILSEQ(count);
   40:     } else {
   41:       *pwc = wc;
   42:       conv->istate = state;
   43:       return count+2;
   44:     }
   45:     s += 2; n -= 2; count += 2;
   46:   }
   47:   conv->istate = state;
   48:   return RET_TOOFEW(count);
   49: }
   50: 
   51: /* But we output UCS-2 in big-endian order, without byte-order mark. */
   52: /* RFC 2152 says:
   53:    "ISO/IEC 10646-1:1993(E) specifies that when characters the UCS-2 form are
   54:     serialized as octets, that the most significant octet appear first." */
   55: static int
   56: ucs2_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
   57: {
   58:   if (wc < 0x10000 && wc != 0xfffe && !(wc >= 0xd800 && wc < 0xe000)) {
   59:     if (n >= 2) {
   60:       r[0] = (unsigned char) (wc >> 8);
   61:       r[1] = (unsigned char) wc;
   62:       return 2;
   63:     } else
   64:       return RET_TOOSMALL;
   65:   } else
   66:     return RET_ILUNI;
   67: }