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.Dd February 4, 2002 .Dt WCSTOMBS 3 .Os ----------------------------------------------------------------------
.Sh NAME .Nm wcstombs .Nd converts a wide character string to a multibyte character string ----------------------------------------------------------------------
.Sh LIBRARY .Lb libc ----------------------------------------------------------------------
.Sh SYNOPSIS n stdlib.h .Ft size_t .Fn wcstombs "const char * restrict s" "wchar_t * restrict pwcs" "size_t n" ----------------------------------------------------------------------
.Sh DESCRIPTION The .Fn wcstombs converts the null-terminated wide character string pointed by .Fa pwcs to the corresponding multibyte character string, and store it to the array pointed by .Fa s . This function may modify the first at most .Fa n bytes of the array pointed by .Fa s . Each characters will be converted as if .Xr wctomb 3 is continuously called, except the internal state of .Xr wctomb 3 will not be affected.
p For state-dependent encoding, the .Fn wcstombs implies the result multibyte character string pointed by .Fa s always to begin with an initial state.
p The behaviour of the .Fn wcstombs is affected by LC_CTYPE category of the current locale.
p
There are special cases:
l -tag -width 012345678901 t s == NULL The
.Fn wcstombs
returns the number of bytes to store the whole multibyte character string
corresponding to the wide character string pointed by
.Fa pwcs .
In this case,
.Fa n
is ignored.
t pwcs == NULL undefined (may causes the program to crash).
.El
----------------------------------------------------------------------
.Sh RETURN VALUES
The
.Fn wcstombs
returns:
l -tag -width 012345678901 t 0 or positive number of bytes stored to the array pointed by
.Fa s .
There is no cases that the value returned is greater than
.Fa n
(unless
.Fa s
is a null pointer).
If the return value is equal to
.Fa n ,
the string pointed by
.Fa s
will not be null-terminated.
t (size_t)-1 .Fa pwcs
points the string containing invalid wide character.
The
.Fn wcstombs
also sets errno to indicate the error.
.El
----------------------------------------------------------------------
.Sh ERRORS
The
.Fn wcstombs
may causes an error in the following case:
l -tag -width Er t Bq Er EILSEQ .Fa pwcs
points the string containing invalid wide character.
.El
----------------------------------------------------------------------
.Sh SEE ALSO
.Xr setlocale 3 ,
.Xr wctomb 3
----------------------------------------------------------------------
.Sh STANDARDS
The
.Fn wcstombs
function conforms to
.St -ansiC .
The restrict qualifier is added at
.St -isoC99 .