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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 (Laq\0aq), 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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