NAME

       wcwidth - determine columns needed for a wide character

LIBRARY

       Standard C library (libc, -lc)

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 │
       └────────────────────────────────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001.

       Note that before glibc 2.2.5, glibc 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)