1BTOWC(3P)                  POSIX Programmer's Manual                 BTOWC(3P)
2
3
4

PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
10

NAME

12       btowc — single byte to wide character conversion
13

SYNOPSIS

15       #include <stdio.h>
16       #include <wchar.h>
17
18       wint_t btowc(int c);
19

DESCRIPTION

21       The functionality described on this reference page is aligned with  the
22       ISO C  standard.  Any  conflict between the requirements described here
23       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
24       defers to the ISO C standard.
25
26       The  btowc()  function  shall  determine  whether c constitutes a valid
27       (one-byte) character in the initial shift state.
28
29       The behavior of this function shall be affected by the  LC_CTYPE  cate‐
30       gory of the current locale.
31

RETURN VALUE

33       The  btowc()  function  shall  return WEOF if c has the value EOF or if
34       (unsigned char) c does not constitute a valid (one-byte)  character  in
35       the  initial shift state. Otherwise, it shall return the wide-character
36       representation of that character.
37
38       In the POSIX locale, btowc() shall not return WEOF if c has a value  in
39       the range 0 to 255 inclusive.
40

ERRORS

42       No errors are defined.
43
44       The following sections are informative.
45

EXAMPLES

47       None.
48

APPLICATION USAGE

50       None.
51

RATIONALE

53       None.
54

FUTURE DIRECTIONS

56       None.
57

SEE ALSO

59       wctob()
60
61       The Base Definitions volume of POSIX.1‐2017, <stdio.h>, <wchar.h>
62

64       Portions  of  this text are reprinted and reproduced in electronic form
65       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
66       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
67       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
68       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
69       event of any discrepancy between this version and the original IEEE and
70       The  Open Group Standard, the original IEEE and The Open Group Standard
71       is the referee document. The original Standard can be  obtained  online
72       at http://www.opengroup.org/unix/online.html .
73
74       Any  typographical  or  formatting  errors that appear in this page are
75       most likely to have been introduced during the conversion of the source
76       files  to  man page format. To report such errors, see https://www.ker‐
77       nel.org/doc/man-pages/reporting_bugs.html .
78
79
80
81IEEE/The Open Group                  2017                            BTOWC(3P)
Impressum