Linux 2.6 - man page for wcswidth (linux section 3posix)
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WCSWIDTH(P) POSIX Programmer's Manual WCSWIDTH(P)
wcswidth - number of column positions of a wide-character string
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
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
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 WCSWIDTH(P)
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