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NAME

       wcwidth - determine columns needed for a wide character

SYNOPSIS

       #define _XOPEN_SOURCE
       #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 L'\0', the value is 0.  Otherwise -1
       is returned.

RETURN VALUE

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

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), feature_test_macros(7)

COLOPHON

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