wctomb - convert a wide character to a multibyte sequence
#include <stdlib.h>
int wctomb(char *s, wchar_t wc);
If s
is not NULL, the wctomb() function
converts the wide character wc
to its multibyte representation
and stores it at the beginning of the character array pointed to by
s
. It updates the shift state, which is stored in a static
anonymous variable known only to the wctomb() function,
and returns the length of said multibyte representation, that is, the
number of bytes written at s
.
The programmer must ensure that there is room for at least
MB_CUR_MAX bytes at s
.
If s
is NULL, the wctomb() function resets
the shift state, known only to this function, to the initial state, and
returns nonzero if the encoding has nontrivial shift state, or zero if
the encoding is stateless.
If s
is not NULL, the wctomb() function
returns the number of bytes that have been written to the byte array at
s
. If wc
can not be represented as a multibyte
sequence (according to the current locale), -1 is returned.
If s
is NULL, the wctomb() function returns
nonzero if the encoding has nontrivial shift state, or zero if the
encoding is stateless.
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
wctomb() | Thread safety | MT-Unsafe race |
POSIX.1-2001, POSIX.1-2008, C99.
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