NAME

btowc — single byte to wide character conversion

SYNOPSIS

#include <stdio.h>
#include <wchar.h>

wint_t btowc(int c);


DESCRIPTION

^[CX] 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.1-2024 defers to the ISO C standard.

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.

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.