MirBSD manpage: wcstombs(3)

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


     wcstombs - converts a wide character string to a multibyte character


     #include <stdlib.h>

     wcstombs(char *s, const wchar_t *pwcs, size_t n);


     wcstombs() converts the null-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 the wcstombs() is affected by the LC_CTYPE category of
     the current locale.

     There are special cases:

     s == NULL     The wcstombs() 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 ig-

     pwcs == NULL  Undefined (may causes the program to crash).


     wcstombs() returns:

     0 or positive
                   Number of bytes stored in the array pointed to by s. There
                   are no cases that the value returned is greater than n (un-
                   less s is a null pointer). If the return value is equal to
                   n, the string pointed to by s will not be null-terminated.

     (size_t)-1    pwcs points the string containing invalid wide character.
                   wcstombs() also sets errno to indicate the error.


     wcstombs() may cause an error in the following cases:

     [EILSEQ]      pwcs Points to the string containing invalid wide charac-


     setlocale(3), wctomb(3)


     The wcstombs() function conforms to ANSI X3.159-1989 ("ANSI C89").

MirBSD #10-current             February 4, 2002                              1

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