WCTOMB(3) BSD Programmer's Manual WCTOMB(3)
wctomb - converts a wide character to a multibyte character
#include <stdlib.h>
int
wctomb(char * s, const wchar_t c);
The wctomb() converts the wide character wchar to the corresponding mul-
tibyte character, and stores it in the array pointed to by s. wctomb()
may store at most MB_CUR_MAX bytes in the array.
In state-dependent encoding, wctomb() may store the special sequence to
change the conversion state before an actual multibyte character into the
array pointed to by s. If wchar is a null wide character ('\0'), this
function places its own internal state to an initial conversion state.
Calling any other functions in libc never change the internal state of
wctomb(), except for calling setlocale(3) with the LC_CTYPE category
changed to that of the current locale. Such setlocale(3) calls cause the
internal state of this function to be indeterminate.
The behaviour of wctomb() is affected by LC_CTYPE category of the current
locale.
There is a special case:
s == NULL wctomb() initializes its own internal state to an initial
state, and determines whether the current encoding is
state-dependent. This function returns 0 if the encoding is
state-independent, otherwise non-zero. In this case, wchar
is completely ignored.
Normally, wctomb() returns:
positive Number of bytes for the valid multibyte character pointed
to by s. There are no cases where the value returned is
greater than n or the value of the MB_CUR_MAX macro.
-1 wchar is an invalid wide character.
If s is equal to NULL, mbtowc() returns:
0 The current encoding is state-independent.
non-zero The current encoding is state-dependent.
No errors are defined.
setlocale(3)
The wctomb() function conforms to ANSI X3.159-1989 ("ANSI C89").
MirBSD #10-current February 3, 2002 1