MirOS Manual: wctomb(3)

WCTOMB(3)                  BSD Programmer's Manual                   WCTOMB(3)


     wctomb - converts a wide character to a multibyte character


     #include <stdlib.h>

     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

     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.




     The wctomb() function conforms to ANSI X3.159-1989 ("ANSI C").

MirOS BSD #10-current          February 3, 2002                              1

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