This API is mainly for Terminal Emulator implementors, or those writing programs that expect to interpreted by a terminal emulator and wish to determine the printable width of a string on a Terminal. Usually, the length of the string is equivalent to the number of cells it occupies except that there are are also some categories of characters which occupy 2 or even 0 cells. POSIX-conforming systems provide wcwidth(3) and wcswidth(3) of which this module's interface mirrors precisely.
WWW: https://github.com/jquast/wcwidth
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