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/*

FUNCTION

<<wcsrtombs>>, <<wcsnrtombs>>---convert a wide-character string to a character string

INDEX

        wcsrtombs

INDEX

        _wcsrtombs_r

INDEX

        wcsnrtombs

INDEX

        _wcsnrtombs_r

ANSI_SYNOPSIS

        #include <wchar.h>

        size_t wcsrtombs(char *<[dst]>, const wchar_t **<[src]>, size_t <[len]>,

                         mbstate_t *<[ps]>);

        #include <wchar.h>

        size_t _wcsrtombs_r(struct _reent *<[ptr]>, char *<[dst]>,

                            const wchar_t **<[src]>, size_t <[len]>,

                            mbstate_t *<[ps]>);

        #include <wchar.h>

        size_t wcsnrtombs(char *<[dst]>, const wchar_t **<[src]>,

                          size_t <[nwc]>, size_t <[len]>, mbstate_t *<[ps]>);

        #include <wchar.h>

        size_t _wcsnrtombs_r(struct _reent *<[ptr]>, char *<[dst]>,

                             const wchar_t **<[src]>, size_t <[nwc]>,

                             size_t <[len]>, mbstate_t *<[ps]>);

TRAD_SYNOPSIS

        #include <wchar.h>

        size_t wcsrtombs(<[dst]>, <[src]>, <[len]>, <[ps]>)

        char *<[dst]>;

        const wchar_t **<[src]>;

        size_t <[len]>;

        mbstate_t *<[ps]>;

        #include <wchar.h>

        size_t _wcsrtombs_r(<[ptr]>, <[dst]>, <[src]>, <[len]>, <[ps]>)

        struct _rent *<[ptr]>;

        char *<[dst]>;

        const wchar_t **<[src]>;

        size_t <[len]>;

        mbstate_t *<[ps]>;

        #include <wchar.h>

        size_t wcsnrtombs(<[dst]>, <[src]>, <[nwc]>, <[len]>, <[ps]>)

        char *<[dst]>;

        const wchar_t **<[src]>;

        size_t <[nwc]>;

        size_t <[len]>;

        mbstate_t *<[ps]>;

        #include <wchar.h>

        size_t _wcsnrtombs_r(<[ptr]>, <[dst]>, <[src]>, <[nwc]>, <[len]>, <[ps]>)

        struct _rent *<[ptr]>;

        char *<[dst]>;

        const wchar_t **<[src]>;

        size_t <[nwc]>;

        size_t <[len]>;

        mbstate_t *<[ps]>;

DESCRIPTION

The <<wcsrtombs>> function converts a string of wide characters indirectly

pointed to by <[src]> to a corresponding multibyte character string stored in

the array pointed to by <[dst}>.  No more than <[len]> bytes are written to

<[dst}>.

If <[dst}> is NULL, no characters are stored.

If <[dst}> is not NULL, the pointer pointed to by <[src]> is updated to point

to the character after the one that conversion stopped at.  If conversion

stops because a null character is encountered, *<[src]> is set to NULL.

The mbstate_t argument, <[ps]>, is used to keep track of the shift state.  If

it is NULL, <<wcsrtombs>> uses an internal, static mbstate_t object, which

is initialized to the initial conversion state at program startup.

The <<wcsnrtombs>> function behaves identically to <<wcsrtombs>>, except that

conversion stops after reading at most <[nwc]> characters from the buffer

pointed to by <[src]>.

RETURNS

The <<wcsrtombs>> and <<wcsnrtombs>> functions return the number of bytes

stored in the array pointed to by <[dst]> (not including any terminating

null), if successful, otherwise it returns (size_t)-1.

PORTABILITY

<<wcsrtombs>> is defined by C99 standard.

<<wcsnrtombs>> is defined by the POSIX.1-2008 standard.

*/

#include <reent.h>

#include <newlib.h>

#include <wchar.h>

#include <stdlib.h>

#include <stdio.h>

#include <errno.h>

#include "local.h"

size_t

_DEFUN (_wcsnrtombs_r, (r, dst, src, nwc, len, ps),

        struct _reent *r _AND

        char *dst _AND

        const wchar_t **src _AND

        size_t nwc _AND

        size_t len _AND

        mbstate_t *ps)

{

  char *ptr = dst;

  char buff[10];

  wchar_t *pwcs;

  size_t n;

  int i;

#ifdef _MB_CAPABLE

  if (ps == NULL)

    {

      _REENT_CHECK_MISC(r);

      ps = &(_REENT_WCSRTOMBS_STATE(r));

    }

#endif

  /* If no dst pointer, treat len as maximum possible value. */

  if (dst == NULL)

    len = (size_t)-1;

  n = 0;

  pwcs = (wchar_t *)(*src);

  while (n < len && nwc-- > 0)

    {

      int count = ps->__count;

      wint_t wch = ps->__value.__wch;

      int bytes = __wctomb (r, buff, *pwcs, __locale_charset (), ps);

      if (bytes == -1)

        {

          r->_errno = EILSEQ;

          ps->__count = 0;

          return (size_t)-1;

        }

      if (n + bytes <= len)

        {

          n += bytes;

          if (dst)

            {

              for (i = 0; i < bytes; ++i)

                *ptr++ = buff[i];

              ++(*src);

            }

          if (*pwcs++ == 0x00)

            {

              if (dst)

                *src = NULL;

              ps->__count = 0;

              return n - 1;

            }

        }

      else

        {

          /* not enough room, we must back up state to before __wctomb call */

          ps->__count = count;

          ps->__value.__wch = wch;

          len = 0;

        }

    }

  return n;

}

#ifndef _REENT_ONLY

size_t

_DEFUN (wcsnrtombs, (dst, src, nwc, len, ps),

        char *dst _AND

        const wchar_t **src _AND

        size_t nwc _AND

        size_t len _AND

        mbstate_t *ps)

{

  return _wcsnrtombs_r (_REENT, dst, src, nwc, len, ps);

}

#endif /* !_REENT_ONLY */