/* * ungetc.c - push a character back onto an input stream *//* $Header: /cvsup/minix/src/lib/stdio/ungetc.c,v 1.1.1.1 2005/04/21 14:56:36 beng Exp $ */#include	<stdio.h>#include	"loc_incl.h"intungetc(int ch, FILE *stream){	unsigned char *p;	if (ch == EOF  || !io_testflag(stream,_IOREADING))		return EOF;	if (stream->_ptr == stream->_buf) {		if (stream->_count != 0) return EOF;		stream->_ptr++;	}	stream->_count++;	p = --(stream->_ptr);		/* ??? Bloody vax assembler !!! */	/* ungetc() in sscanf() shouldn't write in rom */	if (*p != (unsigned char) ch)		*p = (unsigned char) ch;	return ch;}