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Linux and UNIX Man Pages

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Linux 2.6 - man page for wcwidth (linux section 3)

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 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)
GNU
2019-03-06 WCWIDTH(3)

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