#define _XOPEN_SOURCE /* See feature_test_macros(7) */
int wcwidth(wchar_t c);
DESCRIPTIONThe 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 (L'\0'), the value is 0. Otherwise, -1 is returned.
RETURN VALUEThe wcwidth() function returns the number of column positions for c.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|wcwidth()||Thread safety||MT-Safe locale|
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
Note that glibc before 2.2.5 used the prototype
int wcwidth(wint_t c);
NOTESThe behavior of wcwidth() depends on the LC_CTYPE category of the current locale.
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