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/*

FUNCTION

<>---minimal multibyte string to wide char converter

INDEX

	mbstowcs

ANSI_SYNOPSIS

	#include 

	int mbstowcs(wchar_t *restrict <[pwc]>, const char *restrict <[s]>, size_t <[n]>);

TRAD_SYNOPSIS

	#include 

	int mbstowcs(<[pwc]>, <[s]>, <[n]>)

	wchar_t *<[pwc]>;

	const char *<[s]>;

	size_t <[n]>;

DESCRIPTION

When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming

implementation of <>.  In this case, the

only ``multi-byte character sequences'' recognized are single bytes,

and they are ``converted'' to wide-char versions simply by byte

extension.

When _MB_CAPABLE is defined, this routine calls <<_mbstowcs_r>> 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 <> returns <<0>> if

<[s]> is <> or is the empty string;

it returns <<-1>> if _MB_CAPABLE and one of the

multi-byte characters is invalid or incomplete;

otherwise it returns the minimum of: <> or the

number of multi-byte characters in <> plus 1 (to

compensate for the nul character).

If the return value is -1, the state of the <> string is

indeterminate.  If the input has a length of 0, the output

string will be modified to contain a wchar_t nul terminator.

PORTABILITY

<> is required in the ANSI C standard.  However, the precise

effects vary with the locale.

<> requires no supporting OS subroutines.

*/

#ifndef _REENT_ONLY

#include 

#include 

#include 

size_t

_DEFUN (mbstowcs, (pwcs, s, n),

        wchar_t *__restrict pwcs _AND

        const char *__restrict s _AND

        size_t n)

{

#ifdef _MB_CAPABLE

  mbstate_t state;

  state.__count = 0;

  return _mbstowcs_r (_REENT, pwcs, s, n, &state);

#else /* not _MB_CAPABLE */

  int count = 0;

  if (n != 0) {

    do {

      if ((*pwcs++ = (wchar_t) *s++) == 0)

	break;

      count++;

    } while (--n != 0);

  }

  return count;

#endif /* not _MB_CAPABLE */

}

#endif /* !_REENT_ONLY */