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Copyright 2014 Garrett D'Amore <garrett@damore.org>
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wcrtomb, wcrtomb_l - convert a wide-character code to a character (restartable)

#include <stdio.h>

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

#include <stdio.h>
#include <xlocale.h>

size_t wcrtomb_l(char *restrict s, wchar_t wc, mbstate_t *restrict ps,
 locale_t loc);

If s is a null pointer, the wcrtomb() function is equivalent to the call:

wcrtomb(buf, L'\e0', ps);

where buf is an internal buffer.

If s is not a null pointer, the wcrtomb() function determines the number of bytes needed to represent the character that corresponds to the wide-character given by wc (including any shift sequences), and stores the resulting bytes in the array whose first element is pointed to by s. At most MB_CUR_MAX bytes are stored. If wc is a null wide-character, a null byte is stored, preceded by any shift sequence needed to restore the initial shift state. The resulting state described is the initial conversion state.

If ps is a null pointer, the wcrtomb() function uses its own internal mbstate_t object, which is initialized at program startup to the initial conversion state. Otherwise, the mbstate_t object pointed to by ps is used to completely describe the current conversion state of the associated character sequence. The system will behave as if no function defined in the Reference Manual calls wcrtomb().

The behavior of wcrtomb() is affected by the LC_CTYPE category of the current locale. See environ(5). The function wcrtomb_l() behaves identically to wcrtomb(), except instead of operating in the current locale, it operates in the locale specified by loc.

The wcrtomb() function returns the number of bytes stored in the array object (including any shift sequences). When wc is not a valid wide-character, an encoding error occurs. In this case, the function stores the value of the macros EILSEQ in errno and returns (size_t)-1; the conversion state is undefined.

The wcrtomb() function may fail if: EINVAL

EILSEQ

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability See below.

MT-Level See below.

The wcrtomb() function is Standard. The wcrtomb_l() function is Uncommitted.

If ps is a null pointer, these functions should be considered Unsafe for use in multithreaded applications. Otherwise, they are MT-Safe.

mbsinit(3C), newlocale(3C), setlocale(3C), uselocale(3C), attributes(5), standards(5), environ(5)