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//===========================================================================
//
// wcstombs.cxx
//
// ISO standard wcstombs() 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 wcstombs()
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
//
// This code was based on newlib/libc/stdlib/wcstombs.c and newlib/libc/stdlib/wcstombs_r.c
// The following is modified from the original newlib description:
//
/*
FUNCTION
<<wcstombs>>---wide char string to multibyte string converter
INDEX
wcstombs
ANSI_SYNOPSIS
#include <stdlib.h>
int wcstombs(const char *<[s]>, wchar_t *<[pwc]>, size_t <[n]>);
TRAD_SYNOPSIS
#include <stdlib.h>
int wcstombs(<[s]>, <[pwc]>, <[n]>)
const char *<[s]>;
wchar_t *<[pwc]>;
size_t <[n]>;
DESCRIPTION
When CYGINT_LIBC_I18N_MB_REQUIRED is not defined, this is a minimal ANSI-conforming
implementation of <<wcstombs>>. In this case,
all wide-characters are expected to represent single bytes and so
are converted simply by casting to char.
When CYGINT_LIBC_I18N_MB_REQUIRED is defined, this routine calls the LC_CTYPE locale wcstomb_fn
repeatedly 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 <<wcstombs>> returns <<0>> if
<[s]> is the empty string;
it returns <<-1>> if CYGINT_LIBC_I18N_MB_REQUIRED and one of the
wide-char characters does not represent a valid multi-byte character;
otherwise it returns the minimum of: <<n>> or the
number of bytes that are transferred to <<s>>, not including the
nul terminator. If <[s]> is <<NULL>> it returns the number of
bytes that would have been transferred, regardless of <<[n]>>.
If the return value is -1, the state of the <<pwc>> string is
indeterminate. If the input has a length of 0, the output
string will be modified to contain a wchar_t nul terminator if
<<n>> > 0.
PORTABILITY
<<wcstombs>> is required in the ANSI C standard. However, the precise
effects vary with the locale.
<<wcstombs>> 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_WCSTOMBS
# 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
// TRACE
#if defined(CYGDBG_USE_TRACING) && defined(CYGNUM_LIBC_I18N_WCSTOMBS_TRACE_LEVEL)
static int wcstombs_trace = CYGNUM_LIBC_I18N_WCSTOMBS_TRACE_LEVEL;
# define TL1 (0 < wcstombs_trace)
#else
# define TL1 (0)
#endif
// STATICS
// FUNCTIONS
size_t
wcstombs ( char *s, const wchar_t *pwcs, size_t n )
{
size_t retval;
CYG_REPORT_FUNCNAMETYPE( "wcstombs", "returning %ud" );
CYG_REPORT_FUNCARG3( "s=%08x, pwcs=%08x, n=%ud", s, pwcs, n );
if (s != NULL)
CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
if (pwcs != NULL)
CYG_CHECK_DATA_PTR( pwcs, "pwcs is not a valid pointer!" );
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
char *ptr = s;
size_t max = n;
int state = 0;
char buff[8];
int i, num_to_copy;
int (*wctomb_fn)(char *, wchar_t, int *) = __current_ctype_locale->wctomb_fn;
if (wctomb_fn)
{
while (n > 0)
{
int bytes = (size_t)(wctomb_fn (buff, *pwcs, &state));
if (bytes == -1)
{
retval = (size_t)-1;
CYG_REPORT_RETVAL( retval );
return retval;
}
num_to_copy = ((int)n > bytes ? bytes : (int)n);
for (i = 0; i < num_to_copy; ++i)
*ptr++ = buff[i];
if (*pwcs == 0x00)
{
retval = ptr - s - ((int)n >= bytes);
CYG_REPORT_RETVAL( retval );
return retval;
}
++pwcs;
n -= num_to_copy;
}
retval = max;
CYG_REPORT_RETVAL( retval );
return retval;
}
#endif /* CYGINT_LIBC_I18N_MB_REQUIRED */
int count = 0;
if (s == NULL) {
while (*pwcs++ != 0) {
count++;
}
} else {
if (n != 0) {
do {
if ((*s++ = (char) *pwcs++) == 0)
break;
count++;
} while (--n != 0);
}
}
retval = count;
CYG_REPORT_RETVAL( retval );
return retval;
} // wcstombs()
// EOF wcstombs.cxx
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