WCRTOMB(3) Linux Programmers Manual WCRTOMB(3)
NAME
wcrtomb - convert a wide character to a multibyte sequence
SYNOPSIS
#include
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 charac
ter wc to its multibyte representation 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 representation, 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, fol
lowed 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 rep
resented 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 cur
rent locale.
Passing NULL as ps is not multi-thread safe.
SEE ALSO
wcsrtombs(3)
COLOPHON
This page is part of release 3.05 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 1999-07-25 WCRTOMB(3)
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