btowc - convert single byte to wide character

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ btowc()                                                                     │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

       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.

       C99, POSIX.1-2001.

       Standard C library (libc, -lc)

       btowc - convert single byte to wide character

       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
       mbrtowc(3) instead.

       The  btowc()  function returns the wide character converted from the single byte c.  If c is EOF or not a
       valid multibyte sequence of length 1, it returns WEOF.

mbrtowc(3), mbtowc(3), wctob(3)

Linux man-pages 6.9.1                              2024-05-02                                           btowc(3)

       C11, POSIX.1-2008.

#include<wchar.h>wint_tbtowc(intc);