PROLOG<\/a> This manual page is part of the POSIX Programmer\u2019s 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.<\/p>\n wcrtomb \u2014 convert a wide-character code to a character (restartable)<\/p>\n #include size_t wcrtomb(char *restrict s<\/i>, wchar_t wc<\/i>, mbstate_t *restrict ps<\/i>);<\/p>\n The functionality described on this reference page is aligned with the ISO\u00a0C standard. Any conflict between the requirements described here and the ISO\u00a0C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO\u00a0C standard.<\/p>\n If s<\/i> is a null pointer, the wcrtomb<\/i>() function shall be equivalent to the call:<\/p>\n wcrtomb(buf<\/i>, L’\u0000’, ps<\/i>)<\/p>\n where buf<\/i> is an internal buffer.<\/p>\n If s<\/i> is not a null pointer, the wcrtomb<\/i>() function shall determine the number of bytes needed to represent the character that corresponds to the wide character given by wc<\/i> (including any shift sequences), and store the resulting bytes in the array whose first element is pointed to by s<\/i>. At most {MB_CUR_MAX} bytes are stored. If wc<\/i> 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.<\/p>\n If ps<\/i> is a null pointer, the wcrtomb<\/i>() function shall use its own internal mbstate_t<\/b> object, which is initialized at program start-up to the initial conversion state. Otherwise, the mbstate_t<\/b> object pointed to by ps<\/i> 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 POSIX.1-2017 calls wcrtomb<\/i>().<\/p>\n The wcrtomb<\/i>() function need not be thread-safe if called with a NULL ps<\/i> argument.<\/p>\n The behavior of this function shall be affected by the LC_CTYPE<\/i> category of the current locale.<\/p>\n The wcrtomb<\/i>() function shall not change the setting of errno<\/i> if successful.<\/p>\n The wcrtomb<\/i>() function shall return the number of bytes stored in the array object (including any shift sequences). When wc<\/i> is not a valid wide character, an encoding error shall occur. In this case, the function shall store the value of the macro [EILSEQ]<\/b> in errno<\/i> and shall return (size_t<\/b>)\u22121; the conversion state shall be undefined.<\/p>\n The wcrtomb<\/i>() function shall fail if:<\/p>\n
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