Manpage of UNGETWC

UNGETWC

Section: Linux Programmer's Manual (3)
Updated: 2015-08-08
Index
 

NAME

ungetwc - push back a wide character onto a FILE stream  

SYNOPSIS

#include <wchar.h>wint_t ungetwc(wint_t wc, FILE *stream);
 

DESCRIPTION

The ungetwc() function is the wide-character equivalent of the ungetc(3) function. It pushes back a wide character onto streamand returns it.

If wcis WEOF, it returns WEOF. If wcis an invalid wide character, it sets errnoto EILSEQand returns WEOF.

If wcis a valid wide character, it is pushed back onto the stream and thus becomes available for future wide-character read operations. The file-position indicator is decremented by one or more. The end-of-file indicator is cleared. The backing storage of the file is not affected.

Note: wcneed not be the last wide-character read from the stream; it can be any other valid wide character.

If the implementation supports multiple push-back operations in a row, the pushed-back wide characters will be read in reverse order; however, only one level of push-back is guaranteed.  

RETURN VALUE

The ungetwc() function returns wcwhen successful, or WEOFupon failure.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
ungetwc() Thread safetyMT-Safe
 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, C99.  

NOTES

The behavior of ungetwc() depends on the LC_CTYPEcategory of the current locale.  

SEE ALSO

fgetwc(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO

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Time: 22:27:57 GMT, June 20, 2016