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wcwidth—number of column positions of a wide-character code #include <wchar.h>
int wcwidth(const wchar_t wc);
Description
The wcwidth function shall determine the number of column
positions required for the wide character wc. The application
shall ensure that the value of wc is a character representable
as a wchar_t, and is a wide-character code corresponding to a
valid character in the current locale.
Returns
The wcwidth function shall either return 0 (if wc is a null
wide-character code), or return the number of column positions to
be occupied by the wide-character code wc, or return -1 (if wc
does not correspond to a printable wide-character code).
Portability
wcwidth has been introduced in the Single UNIX Specification Volume 2.
wcwidth has been marked as an extension in the Single UNIX Specification Volume 3.