NAME

       wcwidth - determine columns needed for a wide character

SYNOPSIS

       #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
       #include <wchar.h>

       int wcwidth(wchar_t c);

DESCRIPTION

       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.

RETURN VALUE

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

ATTRIBUTES

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

CONFORMING TO

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

       Note that glibc before 2.2.5 used the prototype

       int wcwidth(wint_t c);

NOTES

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

SEE ALSO

       iswprint(3), wcswidth(3)

COLOPHON

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GNU                                                2019-03-06                                         WCWIDTH(3)