strwidth() - returns the display width of a string

int strwidth( string str );

strwidth() returns the number of columns to display string 'str'.

The driver uses rules defined in https://www.unicode.org/reports/tr11/tr11-36.html to calcuate character width.
Control characters has no width, Wide characters, including emojis are two column wide. This rule is also used by
sprintf() to layout strings.

strlen()