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UNGETC(3) BSD Library Functions Manual UNGETC(3)
ungetc -- un-get character from input stream
Standard C Library (libc, -lc)
ungetc(int c, FILE *stream);
The ungetc() function pushes the character c (converted to an unsigned char) back onto the
input stream pointed to by stream. The pushed-backed characters will be returned by subse-
quent reads on the stream (in reverse order). A successful intervening call, using the same
stream, to one of the file positioning functions (fseek(3), fsetpos(3), or rewind(3)) will
discard the pushed back characters.
One character of push-back is guaranteed, but as long as there is sufficient memory, an
effectively infinite amount of pushback is allowed.
If a character is successfully pushed-back, the end-of-file indicator for the stream is
The ungetc() function returns the character pushed-back after the conversion, or EOF if the
operation fails. If the value of the argument c character equals EOF, the operation will
fail and the stream will remain unchanged.
fseek(3), getc(3), setvbuf(3)
The ungetc() function conforms to ANSI X3.159-1989 (``ANSI C89'') and IEEE Std 1003.1-2001
An ungetc() function appeared in Version 7 AT&T UNIX.
BSD April 30, 2010 BSD
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