WCWIDTH(3)

NAME
wcwidth - determine columns needed for a wide character

SYNOPSIS
#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 L'\0', the value is 0. Otherwise -1 is returned.

RETURN VALUE
The wcwidth() function returns the number of column positions for c.

CONFORMING TO
UNIX98, POSIX 1003.1-2001 Note that glibc before 2.2.5 used the prototype
int wcwidth(wint_t c);

SEE ALSO
iswprint(3), wcswidth(3)

NOTES
The behaviour of wcwidth() depends on the LC_CTYPE category of the current locale.