The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008
Copyright © 2001-2008 The IEEE and The Open Group

NAME

wcwidth - number of column positions of a wide-character code

SYNOPSIS

[XSI] [Option Start] #include <wchar.h>

int wcwidth(wchar_t
wc); [Option End]

DESCRIPTION

The wcwidth() function shall determine the number of column positions required for the wide character wc. The application shall ensure that the value of wc is a character representable as a wchar_t, and is a wide-character code corresponding to a valid character in the current locale.

RETURN VALUE

The wcwidth() function shall either return 0 (if wc is a null wide-character code), or return the number of column positions to be occupied by the wide-character code wc, or return -1 (if wc does not correspond to a printable wide-character code).

ERRORS

No errors are defined.


The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

This function was removed from the final ISO/IEC 9899:1990/Amendment 1:1995 (E), and the return value for a non-printable wide character is not specified.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

wcswidth

XBD <wchar.h>

CHANGE HISTORY

First released as a World-wide Portability Interface in Issue 4. Derived from the MSE working draft.

Issue 6

The Open Group Corrigendum U021/12 is applied. This function is marked as an extension.

The normative text is updated to avoid use of the term "must" for application requirements.

End of informative text.

 

return to top of page

UNIX ® is a registered Trademark of The Open Group.
POSIX ® is a registered Trademark of The IEEE.
Copyright © 2001-2008 The IEEE and The Open Group, All Rights Reserved
[ Main Index | XBD | XSH | XCU | XRAT ]