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WCWIDTH(3) Library Functions Manual WCWIDTH(3)

wcwidth
number of column positions of a wide-character code

#include <wchar.h>
int
wcwidth(wchar_t wc);

The wcwidth() function determines the number of column positions required to display the wide character wc.

The wcwidth() function returns 0 if the wc argument is the NUL wide character (L'\0'), -1 if wc is not printable, or otherwise it returns the number of column positions the character occupies, which may be 0, 1, or 2.

iswprint(3), wcswidth(3)

The wcwidth() function conforms to IEEE Std 1003.1-2001 (“POSIX.1”).
September 2, 2016 OpenBSD-current