The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open GroupA newer edition of this document exists here
NAME
btowc - single byte to wide character conversion
SYNOPSIS
#include <stdio.h>
#include <wchar.h>
wint_t btowc(int c);
DESCRIPTION
[CX] ![[Option Start]](../images/opt-start.gif)
The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C
standard.
![[Option End]](../images/opt-end.gif)
The btowc() function shall determine whether c constitutes a valid (one-byte) character in the initial shift
state.
The behavior of this function shall be affected by the LC_CTYPE category of the current locale.
RETURN VALUE
The btowc() function shall return WEOF if c has the value EOF or if (unsigned char) c does not
constitute a valid (one-byte) character in the initial shift state. Otherwise, it shall return the wide-character representation of
that character.
[CX] In
the POSIX locale, btowc() shall not return WEOF if c has a value in the range 0 to 255 inclusive.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
wctob
XBD <stdio.h>, <wchar.h>
CHANGE HISTORY
First released in Issue 5. Included for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E).
Issue 7
POSIX.1-2008, Technical Corrigendum 2, XSH/TC2-2008/0052 [663] is applied.
End of informative text.
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