WCSWIDTHSection: Linux Programmer's Manual (3)
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NAMEwcswidth - determine columns needed for a fixed-size wide-character string
#define _XOPEN_SOURCE #include <wchar.h> int wcswidth(const wchar_t *s, size_t n);
DESCRIPTIONThe wcswidth() function returns the number of columns needed to represent the wide-character string pointed to by s, but at most n wide characters. If a non-printable wide character occurs among these characters, -1 is returned.
RETURN VALUEThe wcswidth() function returns the number of column positions for the wide-character string s, truncated to at most length n.
NOTESThe behavior of wcswidth() depends on the LC_CTYPE category of the current locale.
SEE ALSOiswprint(3), wcwidth(3)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.