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 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
current locale.
SEE ALSO
iswprint(3), wcswidth(3)
COLOPHON
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