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/*

FUNCTION

        <<wcsncpy>>---copy part of a wide-character string

ANSI_SYNOPSIS

        #include <wchar.h>

        wchar_t *wcsncpy(wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);

TRAD_SYNOPSIS

        wchar_t *wcsncpy(<[s1]>, <[s2]>, <[n]>

        wchar_t *<[s1]>;

        const wchar_t *<[s2]>;

        size_t <[n]>;

DESCRIPTION

        The <<wcsncpy>> function copies not more than <[n]> wide-character codes

        (wide-character codes that follow a null wide-character code are not

        copied) from the array pointed to by <[s2]> to the array pointed to

        by <[s1]>. If copying takes place between objects that overlap, the

        behaviour is undefined.  Note that if <[s1]> contains more than <[n]>

        wide characters before its terminating null, the result is not

        null-terminated.

        If the array pointed to by <[s2]> is a wide-character string that is

        shorter than <[n]> wide-character codes, null wide-character codes are

        appended to the copy in the array pointed to by <[s1]>, until <[n]>

        wide-character codes in all are written.

RETURNS

        The <<wcsncpy>> function returns <[s1]>; no return value is reserved to

        indicate an error.

PORTABILITY

ISO/IEC 9899; POSIX.1.

No supporting OS subroutines are required.

*/

#include <_ansi.h>

#include <wchar.h>

wchar_t *

_DEFUN (wcsncpy, (s1, s2, n),

        wchar_t * s1 _AND

        _CONST wchar_t * s2 _AND

        size_t n)

{

  wchar_t *dscan=s1;

  while(n > 0)

    {

      --n;

      if((*dscan++ = *s2++) == L'\0')  break;

    }

  while(n-- > 0)  *dscan++ = L'\0';

  return s1;

}