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



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 charac‐
       ter 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
   Multithreading (see pthreads(7))
       The  wcwidth()  function  is thread-safe with exceptions.  It can be safely used in multi‐
       threaded applications, as long as setlocale(3) is not called to change the  locale  during
       its execution.

CONFORMING TO
       POSIX.1-2001.

       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
       This  page  is  part of release 3.74 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 http://www.kernel.org/doc/man-pages/.



GNU                                         2014-01-22                                 WCWIDTH(3)