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wcsrtombs(3c)
wcsrtombs(3C) Standard C Library Functions wcsrtombs(3C)
NAME
wcsrtombs, wcsnrtombs, wcsrtombs_s - convert a wide-character string to
a character string (restartable)
SYNOPSIS
#include <wchar.h>
size_t wcsrtombs(char *restrict dst,
const wchar_t **restrict src, size_t len,
mbstate_t *restrict ps);
size_t wcsnrtombs(char *restrict dst,
const wchar_t **restrict src, size_t nwc, size_t len,
mbstate_t *restrict ps);
#define __STDC_WANT_LIB_EXT1__ 1
#include <wchar.h>
errno_t wcsrtombs_s(size_t *restrict retval, char *restrict dst,
rsize_t dstmax, const wchar_t **restrict src, rsize_t len,
mbstate_t *restrict ps);
DESCRIPTION
The wcsrtombs() function converts a sequence of wide-characters from
the array indirectly pointed to by src into a sequence of corresponding
characters, beginning in the conversion state described by the object
pointed to by ps. If dst is not a null pointer, the converted charac‐
ters are then stored into the array pointed to by dst. Conversion con‐
tinues up to and including a terminating null wide-character, which is
also stored. Conversion stops earlier in the following cases:
o When a code is reached that does not correspond to a valid
character.
o When the next character would exceed the limit of len total
bytes to be stored in the array pointed to by dst (and dst
is not a null pointer).
Each conversion takes place as if by a call to the wcrtomb() function.
If dst is not a null pointer, the pointer object pointed to by src is
assigned either a null pointer (if conversion stopped due to reaching a
terminating null wide-character) or the address just past the last
wide-character converted (if any). If conversion stopped due to reach‐
ing a terminating null wide-character, the resulting state described is
the initial conversion state.
If ps is a null pointer, the wcsrtombs() function uses its own internal
mbstate_t object, which is initialized at program startup to the ini‐
tial conversion state. Otherwise, the mbstate_t object pointed to by ps
is used to completely describe the current conversion state of the as‐
sociated character sequence. Solaris will behave as if no function de‐
fined in the Solaris Reference Manual calls these functions.
The wcsnrtombs() function is equivalent to the wcsrtombs() function,
except that the conversion is limited to the first nwc wide characters.
The behavior of these functions are affected by the LC_CTYPE category
of the current locale. See environ(7).
The wcsrtombs_s() function is part of the C11 bounds checking inter‐
faces specified in the C11 standard, Annex K. It is similar to the wc‐
srtombs() function, but with differing parameters and return type in
order to provide additional safety checks in the form of explicit run‐
time-constraints as defined by the C11 standard. See runtime_con‐
straint_handler(3C) and INCITS/ISO/IEC 9899:2011.
RETURN VALUES
If conversion stops because a code is reached that does not correspond
to a valid character, an encoding error occurs. In this case, these
functions store the value of the macro EILSEQ in errno and return
(size_t)-1; the conversion state is undefined. Otherwise, these func‐
tions return the number of bytes in the resulting character sequence,
not including the terminating null (if any).
If neither a runtime-constraint violation nor encoding error (the re‐
sult of a failed conversion) occurred, wcsrtombs_s() returns zero, oth‐
erwise, it returns a non-zero value.
ERRORS
The wcsrtombs() function will fail if:
EINVAL The ps argument points to an object that contains an invalid
conversion state.
EILSEQ A wide-character code does not correspond to a valid charac‐
ter.
The wcsrtombs_s() function will fail if:
EINVAL Null pointer is passed or source and destination overlaps.
ERANGE size argument is not a valid value.
EOVERFLOW Destination array is too small
EILSEQ Illegal byte sequence.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSee below _
StandardSee standards(7)
MT-Level
If ps is not a null pointer, wcsrtombs() and wcsnrtombs() use the mb‐
state_t object pointed to by ps and the functions can be used safely in
multithreaded applications. If ps is a null pointer, wcsrtombs() and
wcsnrtombs() use their internal mbstate_t object and the functions are
Unsafe in multithreaded applications.
The wcsrtombs_s() function cannot be used safely in a multithreaded ap‐
plication due to the runtime constraint handler. For more information,
see the runtime_constraint_handler(3C) man page.
SEE ALSO
mbsinit(3C), setlocale(3C), wcrtomb(3C), attributes(7), environ(7),
standards(7)
Handling Characters and Character Strings in Internationalizing and Lo‐
calizing Applications in Oracle Solaris
HISTORY
The wcnsrtombs() and wcsrtombs_s() functions were added in Oracle So‐
laris 11.4.0.
The wcsrtombs() function was added to Solaris in the Solaris 7 release.
Oracle Solaris 11.4 25 Nov 2024 wcsrtombs(3C)