1/*	$NetBSD: yacc.c,v 1.11 2006/04/05 20:03:14 dsl Exp $	*/
2
3/*
4 * Copyright (c) 1987, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if HAVE_NBTOOL_CONFIG_H
33#include "nbtool_config.h"
34#endif
35
36#include <sys/cdefs.h>
37#if defined(__RCSID) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)yacc.c	8.3 (Berkeley) 4/2/94";
40#else
41__RCSID("$NetBSD: yacc.c,v 1.11 2006/04/05 20:03:14 dsl Exp $");
42#endif
43#endif /* not lint */
44
45#include <ctype.h>
46#include <limits.h>
47#include <stdio.h>
48#include <string.h>
49
50#include "ctags.h"
51
52/*
53 * y_entries:
54 *	find the yacc tags and put them in.
55 */
56void
57y_entries(void)
58{
59	int	c;
60	char	*sp;
61	bool	in_rule;
62	char	tok[MAXTOKEN];
63
64	in_rule = NO;
65
66	while (GETC(!=, EOF))
67		switch (c) {
68		case '\n':
69			SETLINE;
70			/* FALLTHROUGH */
71		case ' ':
72		case '\f':
73		case '\r':
74		case '\t':
75			break;
76		case '{':
77			if (skip_key('}'))
78				in_rule = NO;
79			break;
80		case '\'':
81		case '"':
82			if (skip_key(c))
83				in_rule = NO;
84			break;
85		case '%':
86			if (GETC(==, '%'))
87				return;
88			(void)ungetc(c, inf);
89			break;
90		case '/':
91			if (GETC(==, '*'))
92				skip_comment('*');
93			else
94				(void)ungetc(c, inf);
95			break;
96		case '|':
97		case ';':
98			in_rule = NO;
99			break;
100		default:
101			if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
102				break;
103			sp = tok;
104			*sp++ = c;
105			while (GETC(!=, EOF) && (intoken(c) || c == '.'))
106				*sp++ = c;
107			*sp = EOS;
108			get_line();		/* may change before ':' */
109			if (c == EOF)
110				return;
111			while (iswhite(c)) {
112				if (c == '\n')
113					SETLINE;
114				if (GETC(==, EOF))
115					return;
116			}
117			if (c == ':') {
118				pfnote(tok, lineno);
119				in_rule = YES;
120			}
121			else
122				(void)ungetc(c, inf);
123		}
124}
125
126/*
127 * toss_yysec --
128 *	throw away lines up to the next "\n%%\n"
129 */
130void
131toss_yysec(void)
132{
133	int	c;			/* read character */
134	int	state;
135
136	/*
137	 * state == 0 : waiting
138	 * state == 1 : received a newline
139	 * state == 2 : received first %
140	 * state == 3 : received second %
141	 */
142	lineftell = ftell(inf);
143	for (state = 0; GETC(!=, EOF);)
144		switch (c) {
145		case '\n':
146			++lineno;
147			lineftell = ftell(inf);
148			if (state == 3)		/* done! */
149				return;
150			state = 1;		/* start over */
151			break;
152		case '%':
153			if (state)		/* if 1 or 2 */
154				++state;	/* goto 3 */
155			break;
156		default:
157			state = 0;		/* reset */
158			break;
159		}
160}
161