yacc.c revision 87628 
1/*
2 * Copyright (c) 1987, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if 0
35#ifndef lint
36static char sccsid[] = "@(#)yacc.c	8.3 (Berkeley) 4/2/94";
37#endif
38#endif
39
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD: head/usr.bin/ctags/yacc.c 87628 2001-12-10 21:13:08Z dwmalone $");
42
43#include <ctype.h>
44#include <limits.h>
45#include <stdio.h>
46#include <string.h>
47
48#include "ctags.h"
49
50/*
51 * y_entries:
52 *	find the yacc tags and put them in.
53 */
54void
55y_entries()
56{
57	int	c;
58	char	*sp;
59	bool	in_rule;
60	char	tok[MAXTOKEN];
61
62	in_rule = NO;
63
64	while (GETC(!=, EOF))
65		switch (c) {
66		case '\n':
67			SETLINE;
68			/* FALLTHROUGH */
69		case ' ':
70		case '\f':
71		case '\r':
72		case '\t':
73			break;
74		case '{':
75			if (skip_key('}'))
76				in_rule = NO;
77			break;
78		case '\'':
79		case '"':
80			if (skip_key(c))
81				in_rule = NO;
82			break;
83		case '%':
84			if (GETC(==, '%'))
85				return;
86			(void)ungetc(c, inf);
87			break;
88		case '/':
89			if (GETC(==, '*'))
90				skip_comment();
91			else
92				(void)ungetc(c, inf);
93			break;
94		case '|':
95		case ';':
96			in_rule = NO;
97			break;
98		default:
99			if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
100				break;
101			sp = tok;
102			*sp++ = c;
103			while (GETC(!=, EOF) && (intoken(c) || c == '.'))
104				*sp++ = c;
105			*sp = EOS;
106			getline();		/* may change before ':' */
107			while (iswhite(c)) {
108				if (c == '\n')
109					SETLINE;
110				if (GETC(==, EOF))
111					return;
112			}
113			if (c == ':') {
114				pfnote(tok, lineno);
115				in_rule = YES;
116			}
117			else
118				(void)ungetc(c, inf);
119		}
120}
121
122/*
123 * toss_yysec --
124 *	throw away lines up to the next "\n%%\n"
125 */
126void
127toss_yysec()
128{
129	int	c;			/* read character */
130	int	state;
131
132	/*
133	 * state == 0 : waiting
134	 * state == 1 : received a newline
135	 * state == 2 : received first %
136	 * state == 3 : recieved second %
137	 */
138	lineftell = ftell(inf);
139	for (state = 0; GETC(!=, EOF);)
140		switch (c) {
141		case '\n':
142			++lineno;
143			lineftell = ftell(inf);
144			if (state == 3)		/* done! */
145				return;
146			state = 1;		/* start over */
147			break;
148		case '%':
149			if (state)		/* if 1 or 2 */
150				++state;	/* goto 3 */
151			break;
152		default:
153			state = 0;		/* reset */
154			break;
155		}
156}
157