WCSRTOMBS(3) BSD Library Functions Manual WCSRTOMBS(3)NAME
wcsnrtombs, wcsnrtombs_l, wcsrtombs, wcsrtombs_l — convert a wide-charac‐
ter string to a character string (restartable)
LIBRARY
Standard C Library (libc, -lc)
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 num‐
ber 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 ALSOmbsrtowcs(3), wcrtomb(3), wcstombs(3), xlocale(3)STANDARDS
The wcsrtombs() function conforms to ISO/IEC 9899:1999 (“ISO C99”).
The wcsnrtombs() function is an extension to the standard.
BSD July 21, 2004 BSD
