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}