WCSRTOMBS(3)

NAME
wcsnrtombs, wcsnrtombs_l, wcsrtombs, wcsrtombs_l - convert a wide-character string to a character string (restartable)

LIBRARY
libc

SYNOPSIS
#include <wchar.h>
size_t
wcsnrtombs(char *restrict dst, const wchar_t **restrict src, size_t nwc, size_t len, mbstate_t *restrict ps);
size_t
wcsrtombs(char *restrict dst, const wchar_t **restrict src, size_t len, mbstate_t *restrict ps);
#include <wchar.h>
#include <xlocale.h>
size_t
wcsnrtombs_l(char *restrict dst, const wchar_t **restrict src, size_t nwc, size_t len, mbstate_t *restrict ps, locale_t loc);
size_t
wcsrtombs_l(char *restrict dst, const wchar_t **restrict src, size_t len, mbstate_t *restrict ps, locale_t loc);

DESCRIPTION
The wcsrtombs() function converts a string of wide characters, indirectly pointed to by src, to a corresponding multi-byte character string, stored in the array pointed to by dst. No more than len bytes are written to dst.

If dst is NULL, no characters are stored.

If dst is not NULL, the pointer pointed to by src is updated to point to the character after the one that conversion stopped at. If conversion stops because a null character is encountered, *src is set to NULL.

The mbstate_t argument, ps, is used to keep track of the shift state. If it is NULL, wcsrtombs() uses an internal, static mbstate_t object, which is initialized to the initial conversion state at program startup.

The wcsnrtombs() function behaves identically to wcsrtombs(), except that conversion stops after reading at most nwc characters from the buffer pointed to by src.

Although the wcsrtombs() and wcsnrtombs() functions use the current locale, the wcsrtombs_l() and wcsnrtombs_l() functions may be passed locales directly. See xlocale(3) for more information.

RETURN VALUES
If successful, the wcsrtombs() and wcsnrtombs() functions return the number of bytes stored in the array pointed to by dst (not including any terminating null); otherwise, they return (size_t)-1.

ERRORS
The wcsrtombs() and wcsnrtombs() functions will fail if:

[EILSEQ]
    An invalid wide character was encountered.

[EINVAL]
    The conversion state is invalid.

SEE ALSO
mbsrtowcs(3), wcrtomb(3), wcstombs(3), xlocale(3)

STANDARDS
The wcsrtombs() function conforms to isoC-99.

The wcsnrtombs() function is an extension to the standard.