yacc.c revision 87750 
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 87750 2001-12-12 18:24:42Z charnier $");
42
43#include <ctype.h>
44#include <limits.h>
45#include <stdio.h>
46
47#include "ctags.h"
48
49/*
50 * y_entries:
51 *	find the yacc tags and put them in.
52 */
53void
54y_entries()
55{
56	int	c;
57	char	*sp;
58	bool	in_rule;
59	char	tok[MAXTOKEN];
60
61	in_rule = NO;
62
63	while (GETC(!=, EOF))
64		switch (c) {
65		case '\n':
66			SETLINE;
67			/* FALLTHROUGH */
68		case ' ':
69		case '\f':
70		case '\r':
71		case '\t':
72			break;
73		case '{':
74			if (skip_key('}'))
75				in_rule = NO;
76			break;
77		case '\'':
78		case '"':
79			if (skip_key(c))
80				in_rule = NO;
81			break;
82		case '%':
83			if (GETC(==, '%'))
84				return;
85			(void)ungetc(c, inf);
86			break;
87		case '/':
88			if (GETC(==, '*'))
89				skip_comment();
90			else
91				(void)ungetc(c, inf);
92			break;
93		case '|':
94		case ';':
95			in_rule = NO;
96			break;
97		default:
98			if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
99				break;
100			sp = tok;
101			*sp++ = c;
102			while (GETC(!=, EOF) && (intoken(c) || c == '.'))
103				*sp++ = c;
104			*sp = EOS;
105			getline();		/* may change before ':' */
106			while (iswhite(c)) {
107				if (c == '\n')
108					SETLINE;
109				if (GETC(==, EOF))
110					return;
111			}
112			if (c == ':') {
113				pfnote(tok, lineno);
114				in_rule = YES;
115			}
116			else
117				(void)ungetc(c, inf);
118		}
119}
120
121/*
122 * toss_yysec --
123 *	throw away lines up to the next "\n%%\n"
124 */
125void
126toss_yysec()
127{
128	int	c;			/* read character */
129	int	state;
130
131	/*
132	 * state == 0 : waiting
133	 * state == 1 : received a newline
134	 * state == 2 : received first %
135	 * state == 3 : received second %
136	 */
137	lineftell = ftell(inf);
138	for (state = 0; GETC(!=, EOF);)
139		switch (c) {
140		case '\n':
141			++lineno;
142			lineftell = ftell(inf);
143			if (state == 3)		/* done! */
144				return;
145			state = 1;		/* start over */
146			break;
147		case '%':
148			if (state)		/* if 1 or 2 */
149				++state;	/* goto 3 */
150			break;
151		default:
152			state = 0;		/* reset */
153			break;
154		}
155}
156