yyoptions.c

来自「早期freebsd实现」· C语言 代码 · 共 114 行

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)yyoptions.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#include "whoami.h"
#include "0.h"
#include "tree_ty.h"	/* must be included for yy.h */
#include "yy.h"

/*
 * Options processes the option
 * strings which can appear in
 * comments and returns the next character.
 */
options()
{
	register c;
#ifdef PI0
	register ch;
#endif
	register char *optp;

	c = readch();
	if (c != '$')
		return (c);
	do {
		c = readch();
#		ifdef PI0
		ch = c;
#		endif
		switch (c) {
			case 'b':
				optp = &opt( 'b' );
				c = readch();
				if (!digit(c))
					return (c);
				*optp = c - '0';
				c = readch();
				break;
#		    ifdef PC
			case 'C':
				    /*
				     *	C is a replacement for t, fake it.
				     */
				c = 't';
				/* and fall through */
			case 'g':
#		    endif PC
			case 'k':
			case 'l':
			case 'n':
			case 'p':
			case 's':
			case 't':
			case 'u':
			case 'w':
			case 'z':
				optp = &opt( c );
				c = readch();
				if (c == '+') {
					*optp = 1;
					c = readch();
				} else if (c == '-') {
					*optp = 0;
					c = readch();
				} else {
					return (c);
				}
				break;
			default:
				    return (c);
			}
#ifdef PI0
		send(ROSET, ch, *optp);
#endif
	} while (c == ',');
	if ( opt( 'u' ) )
		setuflg();
	return (c);
}