wcwidth(3) - phpMan

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 repre-
       sent 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 cur-
       rent locale.
SEE ALSO
       iswprint(3), wcswidth(3)
COLOPHON
       This page is part of release 4.15 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                               2017-09-15                        WCWIDTH(3)