The Open Group Base Specifications Issue 6
IEEE Std 1003.1-2001
Copyright © 2001 The IEEE and The Open Group, All Rights reserved.
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 IEEE Std 1003.1-2001 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.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
wctob() , the Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h>
CHANGE HISTORY
First released in Issue 5. Included for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E).
End of informative text.
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