ungetc(3S)                                             ungetc(3S)



     NAME
          ungetc - push character back into input stream

     SYNOPSIS
          #include <stdio.h>

          int ungetc (c, stream)
          char c;
          FILE *stream;

     DESCRIPTION
          ungetc inserts the character c into the buffer associated
          with an input stream.  That character, c, will be returned
          by the next getc call on that stream.  ungetc returns c and
          leaves the file stream unchanged.

          One character of pushback is guaranteed provided something
          has been read from the stream and the stream is actually
          buffered.  In the case that stream is stdin, one character
          may be pushed back onto the buffer without a previous read
          statement.

          If c equals EOF, ungetc does nothing to the buffer and
          returns EOF.

          fseek(3S) erases all memory of inserted characters.

     SEE ALSO
          fseek(3S), getc(3S), setbuf(3S).

     DIAGNOSTICS
          ungetc returns EOF if it can't insert the character.























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