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¶

Multithreading (see pthreads(7))¶

The wcwidth() function is thread-safe with exceptions. It can be safely used in multithreaded 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¶

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