158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
/* Copyright (C) 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.org>, 1997.
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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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/* 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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/* This is a non-standard function but it is very useful in the
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implementation of stdio because we have to deal with unterminated
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buffers. At most NMC bytes will be converted. */
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size_t
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__wmemrtowcs (dst, src, nmc, len, ps)
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wchar_t *dst;
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const char **src;
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size_t nmc;
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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 char *run = *src;
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const char *last = run + nmc;
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wchar_t value;
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size_t count;
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if (ps == NULL)
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ps = &internal;
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/* Get information from last use of this state. */
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count = ps->count;
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value = ps->value;
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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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/* Copy all words. */
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while (written < len && run < last)
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{
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unsigned char byte;
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/* Store address of next byte to process. */
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*src = run;
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/* Start reading a new character only if we are in the initial
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state. */
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if (count == 0)
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{
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byte = *run++;
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/* We expect a start of a new multibyte character. */
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if (byte < 0x80)
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{
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/* One byte sequence. */
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count = 0;
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value = byte;
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}
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else if ((byte & 0xe0) == 0xc0)
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{
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count = 1;
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value = byte & 0x1f;
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}
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else if ((byte & 0xf0) == 0xe0)
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{
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/* We expect three bytes. */
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count = 2;
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value = byte & 0x0f;
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}
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else if ((byte & 0xf8) == 0xf0)
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{
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/* We expect four bytes. */
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count = 3;
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value = byte & 0x07;
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}
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else if ((byte & 0xfc) == 0xf8)
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{
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/* We expect five bytes. */
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count = 4;
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value = byte & 0x03;
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}
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else if ((byte & 0xfe) == 0xfc)
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{
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/* We expect six bytes. */
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count = 5;
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value = byte & 0x01;
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}
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else
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{
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/* This is an illegal encoding. */
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__set_errno (EILSEQ);
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return (size_t) -1;
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}
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}
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/* Read the possible remaining bytes. */
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while (run < last && count > 0)
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{
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byte = *run++;
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--count;
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if ((byte & 0xc0) != 0x80)
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{
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/* This is an illegal encoding. */
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__set_errno (EILSEQ);
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return (size_t) -1;
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}
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value <<= 6;
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value |= byte & 0x3f;
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}
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/* If this character is only partially available remember this. */
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if (run == last && count != 0)
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{
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ps->count = count;
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ps->value = value;
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break;
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}
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/* Store value is required. */
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if (dst != NULL)
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*dst++ = value;
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/* Increment counter of produced words. */
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++written;
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}
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/* Store address of next byte to process. */
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*src = run;
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return written;
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}
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weak_alias (__wmemrtowcs, wmemrtowcs)
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