wcswidth - determine columns needed for a fixed-size wide-character string
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.
The wcswidth() function returns the number of column positions for the wide-character string
s, truncated to at most length
The behavior of wcswidth() depends on the LC_CTYPE category of the current locale.
This page is part of release 4.15 of the Linux
man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.