Ultrix-3.1/src/libc/stdio/ungetc.c

Compare this file to the similar file:
Show the results in this format:


/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/*
 * SCCSID: @(#)ungetc.c	3.0	4/22/86
 */
#include <stdio.h>

ungetc(c, iop)
register FILE *iop;
{
	if (c == EOF)
		return(EOF);
	if ((iop->_flag&_IOREAD)==0 || iop->_ptr <= iop->_base)
		if (iop->_ptr == iop->_base && iop->_cnt==0)
			*iop->_ptr++;
		else
			return(EOF);
	iop->_cnt++;
	*--iop->_ptr = c;
	return(c);
}