wcswidth - Man Page

number of column positions of a wide-character string


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.


#include <wchar.h>

int wcswidth(const wchar_t *pwcs, size_t n);


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.

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


See Also


The Base Definitions volume of POSIX.1-2017, Section 3.103, Column Position, <wchar.h>

Referenced By

wchar.h(0p), wcwidth(3p).

2017 IEEE/The Open Group POSIX Programmer's Manual