1UNGETWC(3)                 Linux Programmer's Manual                UNGETWC(3)
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NAME

6       ungetwc - push back a wide character onto a FILE stream
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SYNOPSIS

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

14       The   ungetwc()  function  is  the  wide-character  equivalent  of  the
15       ungetc(3) function.  It pushes back a wide character  onto  stream  and
16       returns it.
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18       If wc is WEOF, it returns WEOF.  If wc is an invalid wide character, it
19       sets errno to EILSEQ and returns WEOF.
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21       If wc is a valid wide character, it is pushed back onto the stream  and
22       thus  becomes available for future wide-character read operations.  The
23       file-position indicator is decremented by one or more.  The end-of-file
24       indicator is cleared.  The backing storage of the file is not affected.
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26       Note:  wc  need not be the last wide-character read from the stream; it
27       can be any other valid wide character.
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29       If the implementation supports multiple push-back operations in a  row,
30       the pushed-back wide characters will be read in reverse order; however,
31       only one level of push-back is guaranteed.
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RETURN VALUE

34       The ungetwc() function returns wc when successful, or WEOF  upon  fail‐
35       ure.
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ATTRIBUTES

38       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
39       tributes(7).
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41       ┌────────────────────────────────────────────┬───────────────┬─────────┐
42       │Interface                                   │ Attribute     │ Value   │
43       ├────────────────────────────────────────────┼───────────────┼─────────┤
44       │ungetwc()                                   │ Thread safety │ MT-Safe │
45       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

48       POSIX.1-2001, POSIX.1-2008, C99.
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NOTES

51       The behavior of ungetwc() depends on the LC_CTYPE category of the  cur‐
52       rent locale.
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SEE ALSO

55       fgetwc(3)
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COLOPHON

58       This  page  is  part of release 5.13 of the Linux man-pages project.  A
59       description of the project, information about reporting bugs,  and  the
60       latest     version     of     this    page,    can    be    found    at
61       https://www.kernel.org/doc/man-pages/.
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65GNU                               2021-03-22                        UNGETWC(3)
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