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WCRTOMB(3)                 Linux Programmer's Manual                WCRTOMB(3)



NAME
       wcrtomb - convert a wide character to a multibyte sequence

SYNOPSIS
       #include <wchar.h>

       size_t wcrtomb(char *s, wchar_t wc, mbstate_t *ps);

DESCRIPTION
       The main case for this function is when s is not NULL and wc is not L'\0'.  In this
       case, the wcrtomb() function converts the wide character wc to its multibyte repre-
       sentation  and  stores  it at the beginning of the character array pointed to by s.
       It updates the shift state *ps, and returns the length of said multibyte  represen-
       tation, that is, the number of bytes written at s.

       A different case is when s is not NULL but wc is L'\0'.  In this case the wcrtomb()
       function stores at the character array pointed to by s the shift sequence needed to
       bring *ps back to the initial state, followed by a '\0' byte.  It updates the shift
       state *ps (i.e., brings it into the initial state), and returns the length  of  the
       shift sequence plus one, that is, the number of bytes written at s.

       A  third  case  is  when  s  is NULL.  In this case wc is ignored, and the function
       effectively returns  wcrtomb(buf,L'\0',ps)  where  buf  is  an  internal  anonymous
       buffer.

       In  all  of the above cases, if ps is a NULL pointer, a static anonymous state only
       known to the wcrtomb() function is used instead.

RETURN VALUE
       The wcrtomb() function returns the number of bytes that have  been  or  would  have
       been  written  to the byte array at s.  If wc can not be represented as a multibyte
       sequence (according to the current locale), (size_t) -1 is returned, and errno  set
       to EILSEQ.

CONFORMING TO
       C99.

NOTES
       The behavior of wcrtomb() depends on the LC_CTYPE category of the current locale.

       Passing NULL as ps is not multithread safe.

SEE ALSO
       wcsrtombs(3)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



GNU                               1999-07-25                        WCRTOMB(3)

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