126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
/* Copyright (C) 1996, 1997 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 not,
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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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/* We don't need the state really because we don't have shift states
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to maintain between calls to this function. */
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static mbstate_t internal;
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size_t
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__wcsrtombs (dst, src, len, ps)
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char *dst;
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const wchar_t **src;
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size_t len;
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mbstate_t *ps;
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{
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size_t written = 0;
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const wchar_t *run = *src;
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if (ps == NULL)
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ps = &internal;
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if (dst == NULL)
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/* The LEN parameter has to be ignored if we don't actually write
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anything. */
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len = ~0;
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while (written < len)
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{
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wchar_t wc = *run++;
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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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__set_errno (EILSEQ);
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return (size_t) -1;
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}
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if (wc == L'\0')
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{
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/* Found the end. */
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if (dst != NULL)
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*dst = '\0';
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*src = NULL;
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return written;
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}
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else if (wc < 0x80)
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{
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/* It's an one byte sequence. */
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if (dst != NULL)
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*dst++ = (char) wc;
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++written;
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}
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else
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{
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size_t step;
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for (step = 2; step < 6; ++step)
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if ((wc & encoding_mask[step - 2]) == 0)
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break;
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if (written + step >= len)
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/* Too long. */
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break;
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if (dst != NULL)
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{
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size_t cnt = step;
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dst[0] = encoding_byte[cnt - 2];
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--cnt;
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do
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{
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dst[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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dst[0] |= wc;
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dst += step;
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}
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written += step;
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}
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}
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/* Store position of first unprocessed word. */
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*src = run;
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return written;
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}
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weak_alias (__wcsrtombs, wcsrtombs)
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