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

//

//      wcstombs.cxx

//

//      ISO standard wcstombs() routine 

//

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

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// -------------------------------------------

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

//#####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 <<NULL>> or 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 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 (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