143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <dlfcn.h>
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#include <errno.h>
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#include <gconv.h>
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#include <string.h>
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#include <wchar.h>
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#include <wcsmbsload.h>
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#include <sysdep.h>
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#ifndef EILSEQ
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# define EILSEQ EINVAL
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#endif
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/* This is the private state used if PS is NULL. */
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static mbstate_t state;
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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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__mbsnrtowcs (wchar_t *dst, const char **src, size_t nmc, size_t len,
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mbstate_t *ps)
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{
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const unsigned char *srcend;
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struct __gconv_step_data data;
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size_t result;
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int status;
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struct __gconv_step *towc;
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size_t dummy;
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const struct gconv_fcts *fcts;
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/* Tell where we want the result. */
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data.__invocation_counter = 0;
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data.__internal_use = 1;
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data.__flags = __GCONV_IS_LAST;
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data.__statep = ps ?: &state;
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if (nmc == 0)
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return 0;
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srcend = (const unsigned char *) *src + __strnlen (*src, nmc - 1) + 1;
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/* Get the conversion functions. */
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fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
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/* Get the structure with the function pointers. */
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towc = fcts->towc;
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__gconv_fct fct = towc->__fct;
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#ifdef PTR_DEMANGLE
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if (towc->__shlib_handle != NULL)
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PTR_DEMANGLE (fct);
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#endif
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/* We have to handle DST == NULL special. */
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if (dst == NULL)
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{
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mbstate_t temp_state;
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wchar_t buf[64]; /* Just an arbitrary size. */
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const unsigned char *inbuf = (const unsigned char *) *src;
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temp_state = *data.__statep;
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data.__statep = &temp_state;
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result = 0;
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data.__outbufend = (unsigned char *) buf + sizeof (buf);
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do
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{
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data.__outbuf = (unsigned char *) buf;
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status = DL_CALL_FCT (fct, (towc, &data, &inbuf, srcend, NULL,
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&dummy, 0, 1));
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result += (wchar_t *) data.__outbuf - buf;
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}
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while (status == __GCONV_FULL_OUTPUT);
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if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
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&& ((wchar_t *) data.__outbuf)[-1] == L'\0')
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/* Don't count the NUL character in. */
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--result;
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}
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else
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{
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/* This code is based on the safe assumption that all internal
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multi-byte encodings use the NUL byte only to mark the end
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of the string. */
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data.__outbuf = (unsigned char *) dst;
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data.__outbufend = data.__outbuf + len * sizeof (wchar_t);
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status = DL_CALL_FCT (fct,
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(towc, &data, (const unsigned char **) src, srcend,
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NULL, &dummy, 0, 1));
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result = (wchar_t *) data.__outbuf - dst;
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/* We have to determine whether the last character converted
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is the NUL character. */
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if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
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&& (assert (result > 0),
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((wchar_t *) dst)[result - 1] == L'\0'))
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{
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assert (__mbsinit (data.__statep));
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*src = NULL;
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--result;
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}
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}
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/* There must not be any problems with the conversion but illegal input
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characters. */
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assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
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|| status == __GCONV_ILLEGAL_INPUT
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|| status == __GCONV_INCOMPLETE_INPUT
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|| status == __GCONV_FULL_OUTPUT);
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if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
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&& status != __GCONV_EMPTY_INPUT && status != __GCONV_INCOMPLETE_INPUT)
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{
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result = (size_t) -1;
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__set_errno (EILSEQ);
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}
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return result;
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}
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weak_alias (__mbsnrtowcs, mbsnrtowcs)
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