wcswidth(3) Library Functions Manual wcswidth(3) NAME wcswidth - determine columns needed for a fixed-size wide-character string LIBRARY Standard C library (libc, -lc) SYNOPSIS #define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include int wcswidth(const wchar_t *s, size_t n); DESCRIPTION The wcswidth() function returns the number of columns needed to represent the wide-character string pointed to by s, but at most n wide characters. If a nonprintable wide character occurs among these characters, -1 is returned. RETURN VALUE The wcswidth() function returns the number of column positions for the wide-character string s, truncated to at most length n. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). +-------------------------------------+---------------+----------------+ |Interface | Attribute | Value | +-------------------------------------+---------------+----------------+ |wcswidth () | Thread safety | MT-Safe locale | +-------------------------------------+---------------+----------------+ STANDARDS POSIX.1-2008. HISTORY POSIX.1-2001. NOTES The behavior of wcswidth() depends on the LC_CTYPE category of the current locale. SEE ALSO iswprint(3), wcwidth(3) Linux man-pages 6.9.1 2024-05-02 wcswidth(3)