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ungetwc

Defined in header <wchar.h> 
wint_t ungetwc( wint_t ch, FILE *stream );
-		 (since C95)

If ch does not equal WEOF, pushes the wide character ch into the input buffer associated with the stream stream in such a manner that subsequent read operation from stream will retrieve that wide character. The external device associated with the stream is not modified.

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Stream repositioning operations fseek, fsetpos, and rewind discard the effects of ungetwc.

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If ungetwc is called more than once without an intervening read or repositioning, it may fail (in other words, a pushback buffer of size 1 is guaranteed, but any larger buffer is implementation-defined). If multiple successful ungetwc were performed, read operations retrieve the pushed-back wide characters in reverse order of ungetwc

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If ch equals WEOF, the operation fails and the stream is not affected.

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A successful call to ungetwc clears the end of file status flag feof.

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A successful call to ungetwc on a stream (whether text or binary) modifies the stream position indicator in unspecified manner but guarantees that after all pushed-back wide characters are retrieved with a read operation, the stream position indicator is equal to its value before ungetwc.

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Parameters

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ch - wide character to be put back
stream - file stream to put the wide character back to

Return value

On success ch is returned.

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On failure WEOF is returned and the given stream remains unchanged.

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References

See also

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puts a character back into a file stream
(function)
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(C95)
 gets a wide character from a file stream
(function)
C++ documentation for ungetwc
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- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/io/ungetwc -

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