|| POSIX Programmer's Manual
PROLOG This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME wcswidth - number of column positions of a wide-character string
int wcswidth(const wchar_t *
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
RETURN VALUE 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.
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.
FUTURE DIRECTIONS None.
wcwidth(), the Base Definitions volume of IEEE Std 1003.1-2001, Section 3.103, Column Position,
COPYRIGHT 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 http://www.opengroup.org/unix/online.html .