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BTOWC(3)                   Linux Programmer's Manual                  BTOWC(3)
NAME
       btowc - convert single byte to wide character
SYNOPSIS
       #include <wchar.h>
       wint_t btowc(int c);
DESCRIPTION
       The btowc() function converts c, interpreted as a multibyte sequence of
       length 1, starting in the initial shift state, to a wide character  and
       returns it.  If c is EOF or not a valid multibyte sequence of length 1,
       the btowc() function returns WEOF.
RETURN VALUE
       The btowc() function returns the wide character converted from the sin-
       gle byte c.  If c is EOF or not a valid multibyte sequence of length 1,
       it returns WEOF.
ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).
       +----------+---------------+---------+
       |Interface | Attribute     | Value   |
       +----------+---------------+---------+
       |btowc()   | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, C99.
NOTES
       The behavior of btowc() depends on the LC_CTYPE category of the current
       locale.
       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 mbtowc(3) or the thread-safe mbr-
       towc(3) instead.
SEE ALSO
       mbrtowc(3), mbtowc(3), wctob(3)
COLOPHON
       This  page  is  part of release 4.15 of the Linux 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/.
GNU                               2015-08-08                          BTOWC(3)