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/* Convert multibyte character to 32-bit wide character.
Copyright (C) 2020 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
#include <config.h>
/* Specification. */
#include <uchar.h>
#include "attribute.h"
#include <errno.h>
#include <stdlib.h>
#if GNULIB_defined_mbstate_t /* AIX, IRIX */
/* Implement mbrtoc32() on top of mbtowc() for the non-UTF-8 locales
and directly for the UTF-8 locales. */
# if defined _WIN32 && !defined __CYGWIN__
# define WIN32_LEAN_AND_MEAN /* avoid including junk */
# include <windows.h>
# elif HAVE_PTHREAD_API
# include <pthread.h>
# if HAVE_THREADS_H && HAVE_WEAK_SYMBOLS
# include <threads.h>
# pragma weak thrd_exit
# define c11_threads_in_use() (thrd_exit != NULL)
# else
# define c11_threads_in_use() 0
# endif
# elif HAVE_THREADS_H
# include <threads.h>
# endif
# include "verify.h"
# include "lc-charset-dispatch.h"
# include "mbtowc-lock.h"
verify (sizeof (mbstate_t) >= 4);
static char internal_state[4];
size_t
mbrtoc32 (char32_t *pwc, const char *s, size_t n, mbstate_t *ps)
{
# define FITS_IN_CHAR_TYPE(wc) 1
# include "mbrtowc-impl.h"
}
#else /* glibc, macOS, FreeBSD, NetBSD, OpenBSD, HP-UX, Solaris, Cygwin, mingw, MSVC, Minix, Android */
/* Implement mbrtoc32() based on the original mbrtoc32() or on mbrtowc(). */
# include <wchar.h>
# include "localcharset.h"
# include "streq.h"
# if MBRTOC32_IN_C_LOCALE_MAYBE_EILSEQ
# include "hard-locale.h"
# include <locale.h>
# endif
static mbstate_t internal_state;
size_t
mbrtoc32 (char32_t *pwc, const char *s, size_t n, mbstate_t *ps)
# undef mbrtoc32
{
/* It's simpler to handle the case s == NULL upfront, than to worry about
this case later, before every test of pwc and n. */
if (s == NULL)
{
pwc = NULL;
s = "";
n = 1;
}
# if MBRTOC32_EMPTY_INPUT_BUG || _GL_LARGE_CHAR32_T
if (n == 0)
return (size_t) -2;
# endif
if (ps == NULL)
ps = &internal_state;
# if HAVE_WORKING_MBRTOC32
/* mbrtoc32() may produce different values for wc than mbrtowc(). Therefore
use mbrtoc32(). */
# if defined _WIN32 && !defined __CYGWIN__
char32_t wc;
size_t ret = mbrtoc32 (&wc, s, n, ps);
if (ret < (size_t) -2 && pwc != NULL)
*pwc = wc;
# else
size_t ret = mbrtoc32 (pwc, s, n, ps);
# endif
# if MBRTOC32_IN_C_LOCALE_MAYBE_EILSEQ
if ((size_t) -2 <= ret && n != 0 && ! hard_locale (LC_CTYPE))
{
if (pwc != NULL)
*pwc = (unsigned char) *s;
return 1;
}
# endif
return ret;
# elif _GL_LARGE_CHAR32_T
/* Special-case all encodings that may produce wide character values
> WCHAR_MAX. */
const char *encoding = locale_charset ();
if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
{
/* Special-case the UTF-8 encoding. Assume that the wide-character
encoding in a UTF-8 locale is UCS-2 or, equivalently, UTF-16. */
/* Here n > 0. */
char *pstate = (char *)ps;
size_t nstate = pstate[0];
char buf[4];
const char *p;
size_t m;
int res;
switch (nstate)
{
case 0:
p = s;
m = n;
break;
case 3:
buf[2] = pstate[3];
FALLTHROUGH;
case 2:
buf[1] = pstate[2];
FALLTHROUGH;
case 1:
buf[0] = pstate[1];
p = buf;
m = nstate;
buf[m++] = s[0];
if (n >= 2 && m < 4)
{
buf[m++] = s[1];
if (n >= 3 && m < 4)
buf[m++] = s[2];
}
break;
default:
errno = EINVAL;
return (size_t)(-1);
}
/* Here m > 0. */
{
# define FITS_IN_CHAR_TYPE(wc) 1
# include "mbrtowc-impl-utf8.h"
}
success:
if (nstate >= (res > 0 ? res : 1))
abort ();
res -= nstate;
/* Set *ps to the initial state. */
# if defined _WIN32 && !defined __CYGWIN__
/* Native Windows. */
/* MSVC defines 'mbstate_t' as an 8-byte struct; the first 4 bytes matter.
On mingw, 'mbstate_t' is sometimes defined as 'int', sometimes defined
as an 8-byte struct, of which the first 4 bytes matter. */
*(unsigned int *)pstate = 0;
# elif defined __CYGWIN__
/* Cygwin defines 'mbstate_t' as an 8-byte struct; the first 4 bytes
matter. */
ps->__count = 0;
# else
pstate[0] = 0;
# endif
return res;
incomplete:
{
size_t k = nstate;
/* Here 0 <= k < m < 4. */
pstate[++k] = s[0];
if (k < m)
{
pstate[++k] = s[1];
if (k < m)
pstate[++k] = s[2];
}
if (k != m)
abort ();
}
pstate[0] = m;
return (size_t)(-2);
invalid:
errno = EILSEQ;
/* The conversion state is undefined, says POSIX. */
return (size_t)(-1);
}
else
{
wchar_t wc;
size_t ret = mbrtowc (&wc, s, n, ps);
if (ret < (size_t) -2 && pwc != NULL)
*pwc = wc;
return ret;
}
# else
/* char32_t and wchar_t are equivalent. Use mbrtowc(). */
wchar_t wc;
size_t ret = mbrtowc (&wc, s, n, ps);
if (ret < (size_t) -2 && pwc != NULL)
*pwc = wc;
return ret;
# endif
}
#endif
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