This module supplies features similar as wcwidth(3) and wcswidth(3)
in C language.
Characters have its own width on terminal depending on locale.
For example, ASCII characters occupy one column per character,
east Asian fullwidth characters (like Hiragana or Han Ideograph)
occupy two columns per character, and combining characters (apperaring
in ISO-8859-11 Thai, Unicode, and so on) occupy zero columns per
character. mbwidth() gives the width of the first character of
the given string and mbswidth() gives the width of the whole given
The names of mbwidth and mbswidth came from multibyte versions
of wcwidth and wcswidth which are wide character versions.
mblen(string) returns number of bytes of the first character of the
string. Please note that a character may consist of multiple
bytes in multibyte encodings such as UTF-8, EUC-JP, EUC-KR,
GB2312, or Big5.
mbwidth(string) returns the width of the first character of the
string. mbswidth(string) returns the width of the whole string.
Parameters are to be given in locale encodings, not always in UTF-8.