Originální popis anglicky:
wcrtomb - convert a wide-character code to a character (restartable)
Návod, kniha: POSIX Programmer's Manual
#include <stdio.h>
size_t wcrtomb(char *restrict
s, wchar_t
wc , mbstate_t *restrict
ps );
If
s is a null pointer, the
wcrtomb() function shall be equivalent
to the call:
where
buf is an internal buffer.
If
s is not a null pointer, the
wcrtomb() function shall determine
the number of bytes needed to represent the character that corresponds to the
wide character given by
wc (including any shift sequences), and store
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 shall be stored, preceded by any shift sequence needed
to restore the initial shift state. The resulting state described shall be the
initial conversion state.
If
ps is a null pointer, the
wcrtomb() function shall use its own
internal
mbstate_t object, which is initialized at program start-up to
the initial conversion state. Otherwise, the
mbstate_t object pointed
to by
ps shall be used to completely describe the current conversion
state of the associated character sequence. The implementation shall behave as
if no function defined in this volume of IEEE Std 1003.1-2001
calls
wcrtomb().
If the application uses any of the _POSIX_THREAD_SAFE_FUNCTIONS or
_POSIX_THREADS functions, the application shall ensure that the
wcrtomb() function is called with a non-NULL
ps argument.
The behavior of this function shall be affected by the
LC_CTYPE category
of the current locale.
The
wcrtomb() function shall return the number of bytes stored in the
array object (including any shift sequences). When
wc is not a valid
wide character, an encoding error shall occur. In this case, the function
shall store the value of the macro [EILSEQ] in
errno and shall return
(
size_t)-1; the conversion state shall be undefined.
The
wcrtomb() function may fail if:
- EINVAL
- ps points to an object that contains an invalid
conversion state.
- EILSEQ
- Invalid wide-character code is detected.
The following sections are informative.
None.
None.
None.
None.
mbsinit() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<wchar.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
