1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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#include <sys/cdefs.h>
33#include <ctype.h>
34#include <limits.h>
35#include <stdio.h>
36
37#include "ctags.h"
38
39/*
40 * y_entries:
41 *	find the yacc tags and put them in.
42 */
43void
44y_entries(void)
45{
46	int	c;
47	char	*sp;
48	bool	in_rule;
49	char	tok[MAXTOKEN];
50
51	in_rule = false;
52
53	while (GETC(!=, EOF))
54		switch (c) {
55		case '\n':
56			SETLINE;
57			/* FALLTHROUGH */
58		case ' ':
59		case '\f':
60		case '\r':
61		case '\t':
62			break;
63		case '{':
64			if (skip_key('}'))
65				in_rule = false;
66			break;
67		case '\'':
68		case '"':
69			if (skip_key(c))
70				in_rule = false;
71			break;
72		case '%':
73			if (GETC(==, '%'))
74				return;
75			(void)ungetc(c, inf);
76			break;
77		case '/':
78			if (GETC(==, '*') || c == '/')
79				skip_comment(c);
80			else
81				(void)ungetc(c, inf);
82			break;
83		case '|':
84		case ';':
85			in_rule = false;
86			break;
87		default:
88			if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
89				break;
90			sp = tok;
91			*sp++ = c;
92			while (GETC(!=, EOF) && (intoken(c) || c == '.'))
93				*sp++ = c;
94			*sp = EOS;
95			get_line();		/* may change before ':' */
96			while (iswhite(c)) {
97				if (c == '\n')
98					SETLINE;
99				if (GETC(==, EOF))
100					return;
101			}
102			if (c == ':') {
103				pfnote(tok, lineno);
104				in_rule = true;
105			}
106			else
107				(void)ungetc(c, inf);
108		}
109}
110
111/*
112 * toss_yysec --
113 *	throw away lines up to the next "\n%%\n"
114 */
115void
116toss_yysec(void)
117{
118	int	c;			/* read character */
119	int	state;
120
121	/*
122	 * state == 0 : waiting
123	 * state == 1 : received a newline
124	 * state == 2 : received first %
125	 * state == 3 : received second %
126	 */
127	lineftell = ftell(inf);
128	for (state = 0; GETC(!=, EOF);)
129		switch (c) {
130		case '\n':
131			++lineno;
132			lineftell = ftell(inf);
133			if (state == 3)		/* done! */
134				return;
135			state = 1;		/* start over */
136			break;
137		case '%':
138			if (state)		/* if 1 or 2 */
139				++state;	/* goto 3 */
140			break;
141		default:
142			state = 0;		/* reset */
143			break;
144		}
145}
146