.\" Copyright (c) 2002 Tim J. Robbins
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.Dd February 13, 2012
.Dt BTOWC 3
.Os
.Sh NAME
.Nm btowc ,
.Nm wctob
.Nd "convert between wide and single-byte characters"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In wchar.h
.Ft wint_t
.Fn btowc "int c"
.Ft int
.Fn wctob "wint_t c"
.In wchar.h
.In xlocale.h
.Ft wint_t
.Fn btowc_l "int c" "locale_t loc"
.Ft int
.Fn wctob_l "wint_t c" "locale_t loc"
.Sh DESCRIPTION
The
.Fn btowc
function converts a single-byte character into a corresponding wide character.
If the character is
.Dv EOF
or not valid in the initial shift state,
.Fn btowc
returns
.Dv WEOF .
.Pp
The
.Fn wctob
function converts a wide character into a corresponding single-byte character.
If the wide character is
.Dv WEOF
or not able to be represented as a single byte in the initial shift state,
.Fn wctob
returns
.Dv EOF .
.Pp
The _l-suffixed versions take an explicit locale argument, while the
non-suffixed versions use the current global or per-thread locale.
.Sh SEE ALSO
.Xr mbrtowc 3 ,
.Xr multibyte 3 ,
.Xr wcrtomb 3
.Sh STANDARDS
The
.Fn btowc
and
.Fn wctob
functions conform to
.St -p1003.1-2001 .
.Sh HISTORY
The
.Fn btowc
and
.Fn wctob
functions first appeared in
.Fx 5.0 .