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mbstowcs_s(3c)
mbstowcs(3C) Standard C Library Functions mbstowcs(3C)
NAME
mbstowcs, mbstowcs_s - convert a character string to a wide-character
string
SYNOPSIS
#include <stdlib.h>
size_t mbstowcs(wchar_t *restrict pwcs, const char *restrict s, size_t n);
#define __STDC_WANT_LIB_EXT1__ 1
#include <stdlib.h>
errno_t mbstowcs_s(size_t *restrict retval, wchar_t *restrict dst,
rsize_t dstmax, const char *restrict src, rsize_t len);
DESCRIPTION
The mbstowcs() function converts a sequence of characters from the ar‐
ray pointed to by s into a sequence of corresponding wide-character
codes and stores not more than n wide-character codes into the array
pointed to by pwcs. No characters that follow a null byte (which is
converted into a wide-character code with value 0) will be examined or
converted. Each character is converted as if by a call to mbtowc(3C).
No more than n elements will be modified in the array pointed to by
pwcs. If copying takes place between objects that overlap, the behavior
is undefined.
The behavior of this function is affected by the LC_CTYPE category of
the current locale. If pwcs is a null pointer, mbstowcs() returns the
length required to convert the entire array regardless of the value of
n, but no values are stored.
The mbstowcs_s() function is part of the bounds checking interfaces
specified in the C11 standard, Annex K. It is similar to the mbstowcs()
function, but with differing parameters and 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 an invalid character is encountered, mbstowcs() returns (size_t) −1
and may set errno to indicate the error. Otherwise, mbstowcs() returns
the number of the array elements modified (or required if pwcs is
NULL), not including a terminating 0 code, if any. The array will not
be zero-terminated if the value returned is n.
If no runtime-constraint violation and no encoding error occurred, mb‐
stowcs_s() returns zero. Otherwise, mbstowcs_s() returns a nonzero
value.
ERRORS
The mbstowcs() function will fail if:
EILSEQ Invalid byte sequence is detected.
The mbstowcs_s() function will fail if:
EINVAL Null pointer is passed.
ERANGE size argument is not a valid value.
EILSEQ Invalid byte sequence is detected.
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 mbstowcs() function can be used safely in multithreaded applica‐
tions.
The mbstowcs_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
setlocale(3C), mblen(3C), mbtowc(3C), wcstombs(3C), wctomb(3C), attrib‐
utes(7), standards(7), wcstombs_s(3C), wctomb_s(3C), runtime_con‐
straint_handler(3C)
Handling Characters and Character Strings in Internationalizing and Lo‐
calizing Applications in Oracle Solaris
HISTORY
The mbstowcs_s() function was added to Solaris in the Oracle Solaris
11.4.0 release.
The mbstowcs() function has been included in all Sun and Oracle re‐
leases of Solaris.
Oracle Solaris 11.4 25 Nov 2024 mbstowcs(3C)