wcwidth(3) - Linux man page
Name
wcwidth - determine columns needed for a wide characterSynopsis
#define _XOPEN_SOURCE /* See feature_test_macros(7) */#include <wchar.h> int wcwidth(wchar_t c);
Description
The wcwidth() function returns the number of columns needed to represent the wide character c. If c is a printable wide character, the value is at least 0. If c is null wide character (Laq\0aq), the value is 0. Otherwise -1 is returned.Return Value
The wcwidth() function returns the number of column positions for c.Conforming to
POSIX.1-2001.Note that glibc before 2.2.5 used the prototype
int wcwidth(wint_t c);