Linux 2.6 - man page for wcwidth (linux section 3posix)
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WCWIDTH(P) POSIX Programmer's Manual WCWIDTH(P)
wcwidth - number of column positions of a wide-character code
int wcwidth(wchar_t wc);
The wcwidth() function shall determine the number of column positions required for the
wide character wc. The application shall ensure that the value of wc is a character repre-
sentable as a wchar_t, and is a wide-character code corresponding to a valid character in
the current locale.
The wcwidth() function shall either return 0 (if wc is a null wide-character code), or
return the number of column positions to be occupied by the wide-character code wc, or
return -1 (if wc does not correspond to 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.
wcswidth() , the Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h>
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 WCWIDTH(P)
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