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+'\" t
+.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
+.\"
+.\" SPDX-License-Identifier: GPL-2.0-or-later
+.\"
+.\" References consulted:
+.\"   GNU glibc-2 source code and manual
+.\"   Dinkumware C library reference http://www.dinkumware.com/
+.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
+.\"   ISO/IEC 9899:1999
+.\"
+.TH btowc 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+btowc \- convert single byte to wide character
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <wchar.h>
+.P
+.BI "wint_t btowc(int " c );
+.fi
+.SH DESCRIPTION
+The
+.BR btowc ()
+function converts \fIc\fP,
+interpreted as a multibyte sequence
+of length 1, starting in the initial shift state, to a wide character and
+returns it.
+If \fIc\fP is
+.B EOF
+or not a valid multibyte sequence of length 1,
+the
+.BR btowc ()
+function returns
+.BR WEOF .
+.SH RETURN VALUE
+The
+.BR btowc ()
+function returns the wide character
+converted from the single byte \fIc\fP.
+If \fIc\fP is
+.B EOF
+or not a valid multibyte sequence of length 1,
+it returns
+.BR WEOF .
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR btowc ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+C99, POSIX.1-2001.
+.SH NOTES
+The behavior of
+.BR btowc ()
+depends on the
+.B LC_CTYPE
+category of the
+current locale.
+.P
+This function should never be used.
+It does not work for encodings which have
+state, and unnecessarily treats single bytes differently from multibyte
+sequences.
+Use either
+.BR mbtowc (3)
+or the thread-safe
+.BR mbrtowc (3)
+instead.
+.SH SEE ALSO
+.BR mbrtowc (3),
+.BR mbtowc (3),
+.BR wctob (3)