92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
/* Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <wchar.h>
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#ifndef EILSEQ
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#define EILSEQ EINVAL
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#endif
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static const wchar_t encoding_mask[] =
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{
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~0x7ff, ~0xffff, ~0x1fffff, ~0x3ffffff
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};
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static const unsigned char encoding_byte[] =
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{
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0xc0, 0xe0, 0xf0, 0xf8, 0xfc
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};
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/* The state is for this UTF8 encoding not used. */
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static mbstate_t internal;
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size_t
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wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
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{
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char fake[1];
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size_t written = 0;
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if (ps == NULL)
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ps = &internal;
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if (s == NULL)
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{
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s = fake;
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wc = L'\0';
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}
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/* Store the UTF8 representation of WC. */
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if (wc < 0 || wc > 0x7fffffff)
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{
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/* This is no correct ISO 10646 character. */
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errno = EILSEQ;
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return (size_t) -1;
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}
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if (wc < 0x80)
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{
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/* It's a one byte sequence. */
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if (s != NULL)
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*s = (char) wc;
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return 1;
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}
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for (written = 2; written < 6; ++written)
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if ((wc & encoding_mask[written - 2]) == 0)
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break;
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if (s != NULL)
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{
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size_t cnt = written;
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s[0] = encoding_byte[cnt - 2];
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--cnt;
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do
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{
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s[cnt] = 0x80 | (wc & 0x3f);
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wc >>= 6;
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}
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while (--cnt > 0);
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s[0] |= wc;
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}
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return written;
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}
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