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wcrtomb(3c)
Standard C Library Functions wcrtomb(3C)
NAME
wcrtomb - convert a wide-character code to a character (restartable)
SYNOPSIS
#include <stdio.h>
size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict ps);
DESCRIPTION
If s is a null pointer, the wcrtomb() function is equivalent to the
call:
wcrtomb(buf, L'\0', ps)
where buf is an internal buffer.
If s is not a null pointer, the wcrtomb() function determines the num‐
ber of bytes needed to represent the character that corresponds to the
wide-character given by wc (including any shift sequences), and stores
the resulting bytes in the array whose first element is pointed to by
s. At most MB_CUR_MAX bytes are stored. If wc is a null wide-character,
a null byte is stored, preceded by any shift sequence needed to restore
the initial shift state. The resulting state described is the initial
conversion state.
If ps is a null pointer, the wcrtomb() 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
associated character sequence. Solaris will behave as if no function
defined in the Solaris Reference Manual calls wcrtomb().
The behavior of this function is affected by the LC_CTYPE category of
the current locale. See environ(7).
RETURN VALUES
The wcrtomb() function returns the number of bytes stored in the array
object (including any shift sequences). When wc is not a valid wide-
character, an encoding error occurs. In this case, the function stores
the value of the macros EILSEQ in errno and returns (size_t)−1; the
conversion state is undefined.
ERRORS
The wcrtomb() function may fail if:
EINVAL The ps argument points to an object that contains an invalid
conversion state.
EILSEQ Invalid wide-character code is detected.
USAGE
If ps is not a null pointer, wcrtomb() uses the mbstate_t object
pointed to by ps and the function can be used safely in multithreaded
applications, as long as setlocale(3C) is not being called to change
the locale. If ps is a null pointer, wcrtomb() uses its internal
mbstate_t object and the function is Unsafe in multithreaded applica‐
tions.
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 NOTES below
_ StandardSee standards(7).
SEE ALSO
mbsinit(3C), setlocale(3C), attributes(7), environ(7), standards(7)
Oracle Solaris 11.4 1 Nov 2003 wcrtomb(3C)