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//===========================================================================

//

//      wctomb.cxx

//

//      ISO standard wctomb() routine 

//

//===========================================================================

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//===========================================================================

//#####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_ucount32 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) {

      // the kernel just throws an assert if this doesn't work

      // 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();

    }

    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