WCWIDTH

Section: Linux Programmer's Manual (3)
Updated: 2014-01-22
Index Return to Main Contents
 

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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Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
Multithreading (see pthreads(7))
CONFORMING TO
NOTES
SEE ALSO
COLOPHON