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 #if 0
33 #ifndef lint
34 static char sccsid[] = "@(#)yacc.c 8.3 (Berkeley) 4/2/94";
35 #endif
36 #endif
37
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: stable/12/usr.bin/ctags/yacc.c 326025 2017-11-20 19:49:47Z pfg $");
40
41 #include <ctype.h>
42 #include <limits.h>
43 #include <stdio.h>
44
45 #include "ctags.h"
46
47 /*
48 * y_entries:
49 * find the yacc tags and put them in.
50 */
51 void
y_entries(void)52 y_entries(void)
53 {
54 int c;
55 char *sp;
56 bool in_rule;
57 char tok[MAXTOKEN];
58
59 in_rule = NO;
60
61 while (GETC(!=, EOF))
62 switch (c) {
63 case '\n':
64 SETLINE;
65 /* FALLTHROUGH */
66 case ' ':
67 case '\f':
68 case '\r':
69 case '\t':
70 break;
71 case '{':
72 if (skip_key('}'))
73 in_rule = NO;
74 break;
75 case '\'':
76 case '"':
77 if (skip_key(c))
78 in_rule = NO;
79 break;
80 case '%':
81 if (GETC(==, '%'))
82 return;
83 (void)ungetc(c, inf);
84 break;
85 case '/':
86 if (GETC(==, '*') || c == '/')
87 skip_comment(c);
88 else
89 (void)ungetc(c, inf);
90 break;
91 case '|':
92 case ';':
93 in_rule = NO;
94 break;
95 default:
96 if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
97 break;
98 sp = tok;
99 *sp++ = c;
100 while (GETC(!=, EOF) && (intoken(c) || c == '.'))
101 *sp++ = c;
102 *sp = EOS;
103 get_line(); /* may change before ':' */
104 while (iswhite(c)) {
105 if (c == '\n')
106 SETLINE;
107 if (GETC(==, EOF))
108 return;
109 }
110 if (c == ':') {
111 pfnote(tok, lineno);
112 in_rule = YES;
113 }
114 else
115 (void)ungetc(c, inf);
116 }
117 }
118
119 /*
120 * toss_yysec --
121 * throw away lines up to the next "\n%%\n"
122 */
123 void
toss_yysec(void)124 toss_yysec(void)
125 {
126 int c; /* read character */
127 int state;
128
129 /*
130 * state == 0 : waiting
131 * state == 1 : received a newline
132 * state == 2 : received first %
133 * state == 3 : received second %
134 */
135 lineftell = ftell(inf);
136 for (state = 0; GETC(!=, EOF);)
137 switch (c) {
138 case '\n':
139 ++lineno;
140 lineftell = ftell(inf);
141 if (state == 3) /* done! */
142 return;
143 state = 1; /* start over */
144 break;
145 case '%':
146 if (state) /* if 1 or 2 */
147 ++state; /* goto 3 */
148 break;
149 default:
150 state = 0; /* reset */
151 break;
152 }
153 }
154