Linux.com

ungetwc.3

UNGETWC

Section: Linux Programmer's Manual (3)
Updated: 1999-09-19
Index Return to Main Contents
 

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 stream and returns it.

If wc is WEOF, it returns WEOF. If wc is an invalid wide character, it sets errno to EILSEQ and returns WEOF.

If wc is 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: wc need 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 wc when successful, or WEOF upon failure.  

CONFORMING TO

C99.  

NOTES

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

SEE ALSO

fgetwc(3)  

COLOPHON

This page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
NOTES
SEE ALSO
COLOPHON

 

Comments

Subscribe to Comments Feed

Upcoming Linux Foundation Courses

  1. LFS220 Linux System Administration
    05 Jan » 08 Jan - Virtual
    Details
  2. LFD331 Developing Linux Device Drivers
    12 Jan » 16 Jan - Virtual
    Details
  3. LFS520 OpenStack Cloud Architecture and Deployment
    12 Jan » 15 Jan - Virtual
    Details

View All Upcoming Courses

Become an Individual Member
Check out the Friday Funnies

Sign Up For the Linux.com Newsletter


Who we are ?

The Linux Foundation is a non-profit consortium dedicated to the growth of Linux.

More About the foundation...

Frequent Questions

Join / Linux Training / Board