.\" Dinkumware C library reference http://www.dinkumware.com/
.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\"
-.TH WCWIDTH 3 2015-08-08 "GNU" "Linux Programmer's Manual"
+.TH WCWIDTH 3 2019-03-06 "GNU" "Linux Programmer's Manual"
.SH NAME
wcwidth \- determine columns needed for a wide character
.SH SYNOPSIS
.nf
.BR "#define _XOPEN_SOURCE" " /* See feature_test_macros(7) */"
.B #include <wchar.h>
-.sp
+.PP
.BI "int wcwidth(wchar_t " c );
.fi
.SH DESCRIPTION
is at least 0.
If
.I c
-is null wide character (L\(aq\\0\(aq), the value is 0.
+is null wide character (L\(aq\e0\(aq), the value is 0.
Otherwise, \-1 is returned.
.SH RETURN VALUE
The
.TE
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
-
+.PP
Note that glibc before 2.2.5 used the prototype
-.br
+.PP
.nf
.BI "int wcwidth(wint_t " c );
.fi