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Unix Version 7 - man page for ungetc (v7 section 3S)

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UNGETC(3S)									       UNGETC(3S)

       ungetc - push character back into input stream

       #include <stdio.h>

       ungetc(c, stream)
       FILE *stream;

       Ungetc pushes the character c back on an input stream.  That character will be returned by
       the next getc call on that stream.  Ungetc returns c.

       One character of pushback is guaranteed provided something has been read from  the  stream
       and the stream is actually buffered.  Attempts to push EOF are rejected.

       Fseek(3) erases all memory of pushed back characters.

       getc(3), setbuf(3), fseek(3)

       Ungetc returns EOF if it can't push a character back.

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