The wcswidth() function shall determine the number of column
positions required for n wide-character codes (or
fewer than n wide-character codes if a null wide-character code
is encountered before n wide-character codes are
exhausted) in the string pointed to by pwcs.
The wcswidth() function either shall return 0 (if pwcs
points to a null wide-character code), or return the number
of column positions to be occupied by the wide-character string pointed
to by pwcs, or return -1 (if any of the first
n wide-character codes in the wide-character string pointed
to by pwcs is not a printable wide-character code).
No errors are defined.
The following sections are informative.
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.
wcwidth() , the Base Definitions volume of IEEE Std 1003.1-2001,
Section 3.103, Column Position, <wchar.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at