Manpage of WCWIDTH
WCWIDTHSection: Linux Programmer's Manual (3)
NAMEwcwidth - determine columns needed for a wide character
#define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <wchar.h>int wcwidth(wchar_t c);
DESCRIPTIONThe wcwidth() function returns the number of columns needed to represent the wide character c. If cis a printable wide character, the value is at least 0. If cis null wide character (Laq\0aq), 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_CTYPEcategory of the current locale.
SEE ALSOiswprint(3), wcswidth(3)
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Time: 22:27:51 GMT, June 20, 2016