The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 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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