NAME

wctob — wide-character to single-byte conversion

SYNOPSIS

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

int wctob(wint_t 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 wctob() function shall determine whether c corresponds to a member of the extended character set whose character representation is a single byte when in the initial shift state.

The behavior of this function shall be affected by the LC_CTYPE category of the current locale.

^[CX] The wctob() function shall not change the setting of errno on valid input.

RETURN VALUE

The wctob() function shall return EOF if c does not correspond to a character with length one in the initial shift state. Otherwise, it shall return the single-byte representation of that character as an unsigned char converted to int.

ERRORS

No errors are defined.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

btowc

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 8

Austin Group Defect 448 is applied, adding a requirement that wctob() does not change the setting of errno on valid input.