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.1-2008.
POSIX.1-2001.
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.