NAME

getwc — get a wide character from a stream

SYNOPSIS

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

wint_t getwc(FILE *stream);


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 getwc() function shall be equivalent to fgetwc(), except that if it is implemented as a macro it may evaluate stream more than once, so the argument should never be an expression with side-effects.

RETURN VALUE

Refer to fgetwc.

ERRORS

Refer to fgetwc.

EXAMPLES

None.

APPLICATION USAGE

Since it may be implemented as a macro, getwc() may treat incorrectly a stream argument with side-effects. In particular, getwc(*f++) does not necessarily work as expected. Therefore, use of this function is not recommended; fgetwc() should be used instead.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

2.5 Standard I/O Streams, fgetwc

XBD <stdio.h>, <wchar.h>

CHANGE HISTORY

First released as a World-wide Portability Interface in Issue 4. Derived from the MSE working draft.

Issue 5

The Optional Header (OH) marking is removed from <stdio.h>.

Issue 7

POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0270 [14] is applied.