NAME

putwc — put a wide character on a stream

SYNOPSIS

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

wint_t putwc(wchar_t wc, 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 putwc() function shall be equivalent to fputwc(), 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 fputwc.

ERRORS

Refer to fputwc.

EXAMPLES

None.

APPLICATION USAGE

Since it may be implemented as a macro, putwc() may treat a stream argument with side-effects incorrectly. In particular, putwc(wc,*f++) need not work correctly. Therefore, use of this function is not recommended; fputwc() should be used instead.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

2.5 Standard I/O Streams, fputwc

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

CHANGE HISTORY

First released as a World-wide Portability Interface in Issue 4.

Issue 5

Aligned with ISO/IEC 9899:1990/Amendment 1:1995 (E). Specifically, the type of argument wc is changed from wint_t to wchar_t.

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

Issue 7

POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0478 [14] is applied.