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wcstombs(3c)
wcstombs(3C) Standard C Library Functions wcstombs(3C)
NAME
wcstombs, wcstombs_s - convert a wide-character string to a character
string
SYNOPSIS
#include <stdlib.h>
size_t wcstombs(char *restrict s, const wchar_t *restrict pwcs, size_t n);
#define __STDC_WANT_LIB_EXT1__ 1
#include <stdlib.h>
errno_t wcstombs_s(size_t *restrict retval, char *restrict dst,
rsize_t dstmax, const wchar_t *restrict src, rsize_t len);
DESCRIPTION
The wcstombs() function converts the sequence of wide-character codes
from the array pointed to by pwcs into a sequence of characters and
stores these characters into the array pointed to by s, stopping if a
character would exceed the limit of n total bytes or if a null byte is
stored. Each wide-character code is converted as if by a call to wc‐
tomb(3C).
The behavior of this function is affected by the LC_CTYPE category of
the current locale.
No more than n bytes will be modified in the array pointed to by s. If
copying takes place between objects that overlap, the behavior is unde‐
fined. If s is a null pointer, wcstombs() returns the length required
to convert the entire array regardless of the value of n, but no values
are stored.
The wcstombs_s() function is part of the C11 bounds checking interfaces
specified in the C11 standard, Annex K. It is similar to the wcstombs()
function, but with differing parameters and return type in order to
provide additional safety checks in the form of explicit runtime-con‐
straints as defined in the C11 standard. See runtime_constraint_han‐
dler(3C) and INCITS/ISO/IEC 9899:2011.
RETURN VALUES
If a wide-character code is encountered that does not correspond to a
valid character (of one or more bytes each), wcstombs() returns
(size_t)-1. Otherwise, wcstombs() returns the number of bytes stored in
the character array, not including any terminating null byte. The array
will not be null-terminated if the value returned is n.
If neither a runtime constraint violation nor encoding error (the re‐
sult of a failed conversion) occurred, wcstombs_s() returns zero, oth‐
erwise, it returns a non-zero value.
ERRORS
The wcstombs() function may fail if:
EILSEQ A wide-character code does not correspond to a valid charac‐
ter.
The wcstombs_s() function may fail if:
EINVAL Null pointer is passed.
ERANGE Size argument is not valid value.
EILSEQ A wide-character code does not correspond to a valid charac‐
ter.
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 _ CSIEnabled _ Interface StabilityCommitted _ MT-LevelSee
below _ StandardSee standards(7).
The wcstombs() function can be used safely in multithreaded applica‐
tions.
The wcstombs_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
mblen(3C), mbstowcs(3C), mbstowcs_s(3C), mbtowc(3C), setlocale(3C), wc‐
tomb(3C), wctomb_s(3C), attributes(7), standards(7), runtime_con‐
straint_handler(3C)
Handling Characters and Character Strings in Internationalizing and Lo‐
calizing Applications in Oracle Solaris
HISTORY
The wcstombs_s() function was added to Solaris in the Oracle Solaris
11.4.0 release.
The wcstombs() function has been included in all Sun and Oracle re‐
leases of Solaris.
Oracle Solaris 11.4 25 Nov 2024 wcstombs(3C)