wcwidth - determine columns needed for a wide character

       For an explanation of the terms used in this section, see attributes(7).
       ┌──────────────────────────────────────────────────────────────────────┬───────────────┬────────────────┐
       │ Interface                                                            │ Attribute     │ Value          │
       ├──────────────────────────────────────────────────────────────────────┼───────────────┼────────────────┤
       │ wcwidth()                                                            │ Thread safety │ MT-Safe locale │
       └──────────────────────────────────────────────────────────────────────┴───────────────┴────────────────┘

       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.

       POSIX.1-2001.

       Note that before glibc 2.2.5, glibc used the prototype

       intwcwidth(wint_tc);

       Standard C library (libc, -lc)

       wcwidth - determine columns needed for a wide character

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

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

iswprint(3), wcswidth(3)

Linux man-pages 6.9.1                              2024-06-15                                         wcwidth(3)

       POSIX.1-2008.

#define_XOPEN_SOURCE       /* See feature_test_macros(7) */
       #include<wchar.h>intwcwidth(wchar_tc);