getwc3p
Get a wide character from a stream
Usage
#include <stdio.h> #include <wchar.h>
wint_t getwc(FILE *stream);
Prolog
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
Overview
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.1‐2017 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().
The following sections are informative.
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.