wcwidth - determine columns needed for a wide character
Standard C library (
libc,
-lc)
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
#include <wchar.h>
int wcwidth(wchar_t c);
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 (L'\0'), the value is
0. Otherwise, -1 is returned.
The
wcwidth() function returns the number of column positions for
c.
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
wcwidth () |
Thread safety |
MT-Safe locale |
POSIX.1-2001, POSIX.1-2008.
Note that before glibc 2.2.5, glibc used the prototype
int wcwidth(wint_t c);
The behavior of
wcwidth() depends on the
LC_CTYPE category of the
current locale.
iswprint(3),
wcswidth(3)