btowc(3) - f37

1BTOWC(3)                   Linux Programmer's Manual                  BTOWC(3)
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NAME

6       btowc - convert single byte to wide character
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SYNOPSIS

9       #include <wchar.h>
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11       wint_t btowc(int c);
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DESCRIPTION

14       The btowc() function converts c, interpreted as a multibyte sequence of
15       length 1, starting in the initial shift state, to a wide character  and
16       returns it.  If c is EOF or not a valid multibyte sequence of length 1,
17       the btowc() function returns WEOF.
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RETURN VALUE

20       The btowc() function returns the wide character converted from the sin‐
21       gle byte c.  If c is EOF or not a valid multibyte sequence of length 1,
22       it returns WEOF.
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ATTRIBUTES

25       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
26       tributes(7).
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28       ┌────────────────────────────────────────────┬───────────────┬─────────┐
29       │Interface                                   │ Attribute     │ Value   │
30       ├────────────────────────────────────────────┼───────────────┼─────────┤
31       │btowc()                                     │ Thread safety │ MT-Safe │
32       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

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

38       The behavior of btowc() depends on the LC_CTYPE category of the current
39       locale.
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41       This function should never be used.  It does  not  work  for  encodings
42       which  have  state,  and  unnecessarily treats single bytes differently
43       from multibyte sequences.  Use either mbtowc(3) or the thread-safe mbr‐
44       towc(3) instead.
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COLOPHON

50       This  page  is  part of release 5.13 of the Linux man-pages project.  A
51       description of the project, information about reporting bugs,  and  the
52       latest     version     of     this    page,    can    be    found    at
53       https://www.kernel.org/doc/man-pages/.
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57GNU                               2021-03-22                          BTOWC(3)