wcwidth(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

WCWIDTH(3)              Linux Programmer's Manual             WCWIDTH(3)

NAME         top

       wcwidth - determine columns needed for a wide character

SYNOPSIS         top

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

       int wcwidth(wchar_t c);

DESCRIPTION         top

       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         top

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

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌───────────────────────────────┬───────────────┬────────────────┐
       │Interface                      Attribute     Value          │
       ├───────────────────────────────┼───────────────┼────────────────┤
       │wcwidth()                      │ Thread safety │ MT-Safe locale │
       └───────────────────────────────┴───────────────┴────────────────┘

CONFORMING TO         top

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

       Note that glibc before 2.2.5 used the prototype

       int wcwidth(wint_t c);

NOTES         top

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

SEE ALSO         top

       iswprint(3), wcswidth(3)

COLOPHON         top

       This page is part of release 5.13 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

GNU                            2021-03-22                     WCWIDTH(3)

Pages that refer to this page: curs_getcchar(3x)wcswidth(3)unicode(7)