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//===========================================================================
//
// mbtowc.cxx
//
// ISO standard mbtowc() routine
//
//===========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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 2 or (at your option) any later
// version.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jjohnstn
// Contributors: jjohnstn
// Date: 2000-11-01
// Purpose: Provide ISO C mbtowc() routine
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
//
// This code was based upon newlib/libc/stdlib/mbtowc.c
// The following is modified from the original newlib description:
//
/*
FUNCTION
<<mbtowc>>---multibyte to wide char converter
INDEX
mbtowc
ANSI_SYNOPSIS
#include <stdlib.h>
int mbtowc(wchar_t *<[pwc]>, const char *<[s]>, size_t <[n]>);
TRAD_SYNOPSIS
#include <stdlib.h>
int mbtowc(<[pwc]>, <[s]>, <[n]>)
wchar_t *<[pwc]>;
const char *<[s]>;
size_t <[n]>;
DESCRIPTION
When CYGINT_LIBC_I18N_MB_REQUIRED is not defined, this is a minimal ANSI-conforming
implementation of <<mbtowc>>. In this case,
only ``multi-byte character sequences'' recognized are single bytes,
and they are ``converted'' to themselves.
Each call to <<mbtowc>> copies one character from <<*<[s]>>> to
<<*<[pwc]>>>, unless <[s]> is a null pointer. The argument n
is ignored.
When CYGINT_LIBC_I18N_MB_REQUIRED is defined, this routine calls the LC_CTYPE locale mbtowc_fn to perform
the conversion, passing a state variable to allow state dependent
decoding. The result is based on the locale setting which may
be restricted to a defined set of locales.
RETURNS
This implementation of <<mbtowc>> returns <<0>> if
<[s]> is <<NULL>> or is the empty string;
it returns <<1>> if not CYGINT_LIBC_I18N_MB_REQUIRED or
the character is a single-byte character; it returns <<-1>>
if n is <<0>> or the multi-byte character is invalid;
otherwise it returns the number of bytes in the multibyte character.
If the return value is -1, no changes are made to the <<pwc>>
output string. If the input is the empty string, a wchar_t nul
is placed in the output string and 0 is returned. If the input
has a length of 0, no changes are made to the <<pwc>> output string.
PORTABILITY
<<mbtowc>> is required in the ANSI C standard. However, the precise
effects vary with the locale.
<<mbtowc>> requires no supporting OS subroutines.
*/
// CONFIGURATION
#include <pkgconf/libc_i18n.h> // Configuration header
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common type definitions
#include <cyg/infra/cyg_trac.h> // Tracing support
#include <cyg/infra/cyg_ass.h> // Assertion support
#include <locale.h>
#include <stdlib.h> // Header for this file
#include <string.h> // strcmp definition
#include <stddef.h> // size_t definition
#include "internal.h" // __current_ctype_locale
#ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB
# include <pkgconf/kernel.h> // kernel configuration
# include <cyg/kernel/thread.hxx> // per-thread data
# include <cyg/kernel/thread.inl> // per-thread data
# include <cyg/kernel/mutex.hxx> // mutexes
#endif /* CYGSEM_LIBC_I18N_PER_THREAD_MB */
// TRACE
#if defined(CYGDBG_USE_TRACING) && defined(CYGNUM_LIBC_I18N_MBTOWC_TRACE_LEVEL)
static int mbtowc_trace = CYGNUM_LIBC_I18N_MBTOWC_TRACE_LEVEL;
# define TL1 (0 < mbtowc_trace)
#else
# define TL1 (0)
#endif
// STATICS
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
# ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB
static volatile Cyg_Thread::cyg_data_index
mbtowc_data_index=CYGNUM_KERNEL_THREADS_DATA_MAX;
static Cyg_Mutex mbtowc_data_mutex CYG_INIT_PRIORITY(LIBC);
# else
static int cyg_libc_mbtowc_last;
# endif
#endif
// FUNCTIONS
int
mbtowc ( wchar_t *pwc, const char *s, size_t n )
{
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
int *state;
#endif
int retval;
CYG_REPORT_FUNCNAMETYPE( "mbtowc", "returning %d" );
CYG_REPORT_FUNCARG3( "pwc=%08x, s=%08x, n=%ud", pwc, s, n );
if (pwc != NULL)
CYG_CHECK_DATA_PTR( pwc, "pwc is not a valid pointer!" );
if (s != NULL)
CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
#ifdef CYGSEM_LIBC_I18N_PER_THREAD_MB
Cyg_Thread *self = Cyg_Thread::self();
// Get a per-thread data slot if we haven't got one already
// Do a simple test before locking and retrying test, as this is a
// rare situation
if (CYGNUM_KERNEL_THREADS_DATA_MAX==mbtowc_data_index) {
mbtowc_data_mutex.lock();
if (CYGNUM_KERNEL_THREADS_DATA_MAX==mbtowc_data_index) {
// FIXME: Should use real CDL to pre-allocate a slot at compile
// time to ensure there are enough slots
mbtowc_data_index = self->new_data_index();
CYG_ASSERT(mbtowc_data_index >= 0, "failed to allocate data index" );
}
mbtowc_data_mutex.unlock();
} // if
// we have a valid index now
state = (int *)self->get_data_ptr(mbtowc_data_index);
#else
state = &cyg_libc_mbtowc_last;
#endif
CYG_TRACE2( TL1, "Retrieved mbtowc_last address %08x containing %d",
state, *state );
if (__current_ctype_locale->mbtowc_fn)
{
retval = __current_ctype_locale->mbtowc_fn (pwc, s, n, state);
CYG_REPORT_RETVAL( retval );
return retval;
}
#endif /* CYGINT_LIBC_I18N_MB_REQUIRED */
if (s == NULL)
retval = 0;
else if (n == 0)
retval = -1;
else
{
if (pwc)
*pwc = (wchar_t) *s;
retval = (*s != '\0');
}
CYG_REPORT_RETVAL( retval );
return retval;
} // mbtowc()
// EOF mbtowc.cxx
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