код символа к персонажу (character code to a character)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
wctomb — convert a wide-character code to a character
Синопсис (Synopsis)
#include <stdlib.h>
int wctomb(char *s, wchar_t wchar);
Описание (Description)
The functionality described on this reference page is aligned
with the ISO C standard. Any conflict between the requirements
described here and the ISO C standard is unintentional. This
volume of POSIX.1‐2017 defers to the ISO C standard.
The wctomb() function shall determine the number of bytes needed
to represent the character corresponding to the wide-character
code whose value is wchar (including any change in the shift
state). It shall store the character representation (possibly
multiple bytes and any special bytes to change shift state) in
the array object pointed to by s (if s is not a null pointer). At
most {MB_CUR_MAX} bytes shall be stored. If wchar is 0, a null
byte shall be stored, preceded by any shift sequence needed to
restore the initial shift state, and wctomb() shall be left in
the initial shift state.
The behavior of this function is affected by the LC_CTYPE
category of the current locale. For a state-dependent encoding,
this function shall be placed into its initial state by a call
for which its character pointer argument, s, is a null pointer.
Subsequent calls with s as other than a null pointer shall cause
the internal state of the function to be altered as necessary. A
call with s as a null pointer shall cause this function to return
a non-zero value if encodings have state dependency, and 0
otherwise. Changing the LC_CTYPE category causes the shift state
of this function to be unspecified.
The wctomb() function need not be thread-safe.
The implementation shall behave as if no function defined in this
volume of POSIX.1‐2017 calls wctomb().
Возвращаемое значение (Return value)
If s is a null pointer, wctomb() shall return a non-zero or 0
value, if character encodings, respectively, do or do not have
state-dependent encodings. If s is not a null pointer, wctomb()
shall return -1 if the value of wchar does not correspond to a
valid character, or return the number of bytes that constitute
the character corresponding to the value of wchar.
In no case shall the value returned be greater than the value of
the {MB_CUR_MAX} macro.
Ошибки (Error)
The wctomb() function shall fail if:
EILSEQ An invalid wide-character code is detected.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
mblen(3p), mbtowc(3p), mbstowcs(3p), wcstombs(3p)
The Base Definitions volume of POSIX.1‐2017, stdlib.h(0p)
