.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>

.\"

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.\" 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 2015-08-08 "GNU" "Linux Programmer's Manual"

.SH NAME

btowc \- convert single byte to wide character

.SH SYNOPSIS

.nf

.B #include <wchar.h>

.PP

.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;

lb lb lb

l l l.

Interface	Attribute	Value

T{

.BR btowc ()

T}	Thread safety	MT-Safe

.TE

.SH CONFORMING TO

POSIX.1-2001, POSIX.1-2008, C99.

.SH NOTES

The behavior of

.BR btowc ()

depends on the

.B LC_CTYPE

category of the

current locale.

.PP

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)

.SH COLOPHON

This page is part of release 4.15 of the Linux

.I man-pages

project.

A description of the project,

information about reporting bugs,

and the latest version of this page,

can be found at

\%https://www.kernel.org/doc/man\-pages/.