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//===========================================================================
//
// wctomb.cxx
//
// ISO standard wctomb() 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: 2000-11-02
// Purpose: Provide ISO C wctomb() routine
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
//
// This code was based on newlib/libc/stdlib/wctomb.c
// The following is modified from the original newlib description:
//
/*
FUNCTION
<<wctomb>>---wide char to multibyte converter
INDEX
wctomb
ANSI_SYNOPSIS
#include <stdlib.h>
int wctomb(char *<[s]>, wchar_t <[wchar]>);
TRAD_SYNOPSIS
#include <stdlib.h>
int wctomb(<[s]>, <[wchar]>)
char *<[s]>;
wchar_t <[wchar]>;
DESCRIPTION
When CYG_LIBC_MB_CAPABLE is not defined, this is a minimal ANSI-conforming
implementation of <<wctomb>>. The
only ``wide characters'' recognized are single bytes,
and they are ``converted'' to themselves.
When CYG_LIBC_MB_CAPABLE is defined, this routine calls the LC_CTYPE locale wctomb_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.
Each call to <<wctomb>> modifies <<*<[s]>>> unless <[s]> is a null
pointer or CYG_LIBC_MB_CAPABLE is defined and <[wchar]> is invalid.
RETURNS
This implementation of <<wctomb>> returns <<0>> if
<[s]> is <<NULL>>; it returns <<-1>> if CYG_LIBC_MB_CAPABLE is enabled
and the wchar is not a valid multi-byte character, it returns <<1>>
if CYG_LIBC_MB_CAPABLE is not defined or the wchar is in reality a single
byte character, otherwise it returns the number of bytes in the
multi-byte character.
PORTABILITY
<<wctomb>> is required in the ANSI C standard. However, the precise
effects vary with the locale.
<<wctomb>> 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 definition
#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_WCTOMB_TRACE_LEVEL)
static int wctomb_trace = CYGNUM_LIBC_I18N_WCTOMB_TRACE_LEVEL;
# define TL1 (0 < wctomb_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
wctomb_data_index=CYGNUM_KERNEL_THREADS_DATA_MAX;
static Cyg_Mutex wctomb_data_mutex CYG_INIT_PRIORITY(LIBC);
# else
static int cyg_libc_wctomb_last;
# endif
#endif
int
wctomb ( char *s, const wchar_t wchar )
{
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
int *state;
#endif
int retval;
CYG_REPORT_FUNCNAMETYPE( "wctomb", "returning %d" );
CYG_REPORT_FUNCARG2( "s=%08x, wchar=%08x", s, wchar );
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==wctomb_data_index) {
wctomb_data_mutex.lock();
if (CYGNUM_KERNEL_THREADS_DATA_MAX==wctomb_data_index) {
// FIXME: Should use real CDL to pre-allocate a slot at compile
// time to ensure there are enough slots
wctomb_data_index = self->new_data_index();
CYG_ASSERT(wctomb_data_index >= 0, "failed to allocate data index" );
}
wctomb_data_mutex.unlock();
} // if
// we have a valid index now
state = (int *)self->get_data_ptr(wctomb_data_index);
#else /* not CYGSEM_LIBC_I18N_PER_THREAD_MB */
state = &cyg_libc_wctomb_last;
#endif /* not CYGSEM_LIBC_I18N_PER_THREAD_MB */
CYG_TRACE2( TL1, "Retrieved wctomb_last address %08x containing %d",
state, *state );
if (__current_ctype_locale->wctomb_fn)
{
retval = __current_ctype_locale->wctomb_fn (s, wchar, state);
CYG_REPORT_RETVAL( retval );
return retval;
}
#endif /* CYGINT_LIBC_I18N_MB_REQUIRED */
if (s == NULL)
retval = 0;
else
{
*s = (char) wchar;
retval = 1;
}
CYG_REPORT_RETVAL( retval );
return retval;
} // wctomb()
// EOF wctomb.cxx
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