WCRTOMB(3) | Library Functions Manual | WCRTOMB(3) |
wcrtomb
— converts
a wide character to a multibyte character (restartable)
#include
<wchar.h>
size_t
wcrtomb
(const
char * restrict s,
wchar_t wc,
mbstate_t * restrict
ps);
wcrtomb
()
converts the wide character given by wc to the
corresponding multibyte character, and stores up to
MB_CUR_MAX
bytes in the array pointed to by
s if s is not a null
pointer.
The behaviour of
wcrtomb
()
is affected by the LC_CTYPE
category of the current
locale.
These are the special cases:
wcrtomb
()
stores a null byte preceded by a special byte sequence (if any) to return
to an initial state to the array pointed by s, and
the state object pointed by ps also returned to an
initial state.wcrtomb
() just places ps
into an initial state. It is equivalent to the following call:
wcrtomb(buf, L'\0', ps);
Here, buf is a dummy buffer. In this case, wc is ignored.
mbrtowc
()
uses its own internal state object to keep the conversion state, instead
of ps mentioned in this manual page.
Calling any other functions in
libc never
change the internal state of
mbrtowc
(),
which is initialized at startup time of the program.
wcrtomb
() returns the number of bytes
(including any shift sequences) which are stored in the array pointed to by
s. If wc is not a valid wide
character, wcrtomb
() returns (size_t)-1 and sets
errno to indicate error.
wcrtomb
() may cause an error in the
following cases:
The wcrtomb
() function conforms to ISO/IEC
9899/AMD1:1995 (“ISO C90, Amendment 1”). The restrict
qualifier is added at ISO/IEC 9899/1999 (“ISO C99”).
March 22, 2015 | OpenBSD-current |