size_t
wcstombs(char * restrict s, const wchar_t * restrict pwcs, size_t n)
)
converts the nul-terminated wide character string pointed to by
pwcs
to the corresponding multibyte character string,
and stores it in the array pointed to by
s.
This function may modify the first at most
n
bytes of the array pointed to by
s.
Each character will be converted as if
wctomb(3)
is continuously called, except the internal state of
wctomb(3)
will not be affected.
For state-dependent encoding, the
wcstombs()
implies the result multibyte character string pointed to by
s
always to begin with an initial state.
The behaviour of
wcstombs()
is affected by the
LC_CTYPE
category of the current locale.
These are the special cases:
)
returns the number of bytes to store the whole multibyte character string
corresponding to the wide character string pointed to by
pwcs.
In this case,
n
is ignored.
)
returns:
s.
There are no cases that the value returned is greater than
n
(unless
s
is a null pointer).
If the return value is equal to
n,
the string pointed to by
s
will not be nul-terminated.
pwcs
points to a string containing an invalid wide character.
wcstombs()
also sets
errno
to indicate the error.
)
may cause an error in the following case:
EILSEQ]pwcs
points to a string containing an invalid wide character.
)
function conforms to
ANSI X3.159-1989 (``ANSI C89'') .
The restrict qualifier is added at
ISO/IEC 9899:1999 (``ISO C99'') .