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NetBSD 6.1.5 - man page for ungetc (netbsd section 3)

UNGETC(3)			   BSD Library Functions Manual 			UNGETC(3)

NAME
     ungetc -- un-get character from input stream

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdio.h>

     int
     ungetc(int c, FILE *stream);

DESCRIPTION
     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
     cleared.

RETURN VALUES
     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.

SEE ALSO
     fseek(3), getc(3), setvbuf(3)

STANDARDS
     The ungetc() function conforms to ANSI X3.159-1989 (``ANSI C89'') and IEEE Std 1003.1-2001
     (``POSIX.1'').

HISTORY
     An ungetc() function appeared in Version 7 AT&T UNIX.

BSD					  April 30, 2010				      BSD


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