Linux 2.6 - man page for wcswidth (linux section 3)
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WCSWIDTH(3) Linux Programmer's Manual WCSWIDTH(3)
wcswidth - determine columns needed for a fixed-size wide-character string
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
int wcswidth(const wchar_t *s, size_t n);
The wcswidth() function returns the number of columns needed to represent the wide-charac-
ter string pointed to by s, but at most n wide characters. If a nonprintable wide charac-
ter occurs among these characters, -1 is returned.
The wcswidth() function returns the number of column positions for the wide-character
string s, truncated to at most length n.
Multithreading (see pthreads(7))
The wcswidth() function is thread-safe with exceptions. It can be safely used in multi-
threaded applications, as long as setlocale(3) is not called to change the locale.
The behavior of wcswidth() depends on the LC_CTYPE category of the current locale.
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GNU 2013-11-18 WCSWIDTH(3)
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