1BTOWC(3P)                  POSIX Programmer's Manual                 BTOWC(3P)
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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.
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NAME

13       btowc — single byte to wide character conversion
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SYNOPSIS

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

22       The functionality described on this reference page is aligned with  the
23       ISO C  standard.  Any  conflict between the requirements described here
24       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
25       defers to the ISO C standard.
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27       The  btowc()  function  shall  determine  whether c constitutes a valid
28       (one-byte) character in the initial shift state.
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30       The behavior of this function shall be affected by the  LC_CTYPE  cate‐
31       gory of the current locale.
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RETURN VALUE

34       The  btowc()  function  shall  return WEOF if c has the value EOF or if
35       (unsigned char) c does not constitute a valid (one-byte)  character  in
36       the  initial shift state. Otherwise, it shall return the wide-character
37       representation of that character.
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ERRORS

40       No errors are defined.
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42       The following sections are informative.
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EXAMPLES

45       None.
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APPLICATION USAGE

48       None.
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RATIONALE

51       None.
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FUTURE DIRECTIONS

54       None.
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SEE ALSO

57       wctob()
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59       The Base Definitions volume of POSIX.1‐2008, <stdio.h>, <wchar.h>
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62       Portions of this text are reprinted and reproduced in  electronic  form
63       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
64       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
65       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
66       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
67       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
68       event of any discrepancy between this version and the original IEEE and
69       The  Open Group Standard, the original IEEE and The Open Group Standard
70       is the referee document. The original Standard can be  obtained  online
71       at http://www.unix.org/online.html .
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73       Any  typographical  or  formatting  errors that appear in this page are
74       most likely to have been introduced during the conversion of the source
75       files  to  man page format. To report such errors, see https://www.ker‐
76       nel.org/doc/man-pages/reporting_bugs.html .
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80IEEE/The Open Group                  2013                            BTOWC(3P)
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