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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)yacc.c 8.3 (Berkeley) 4/2/94
30 * $FreeBSD: head/usr.bin/ctags/yacc.c 299355 2016-05-10 11:11:23Z bapt $
31 */
32
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 */
43 void
y_entries(void)44 y_entries(void)
45 {
46 int c;
47 char *sp;
48 bool in_rule;
49 char tok[MAXTOKEN];
50
51 in_rule = NO;
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 = NO;
66 break;
67 case '\'':
68 case '"':
69 if (skip_key(c))
70 in_rule = NO;
71 break;
72 case '%':
73 if (GETC(==, '%'))
74 return;
75 ungetc(c, inf);
76 break;
77 case '/':
78 if (GETC(==, '*') || c == '/')
79 skip_comment(c);
80 else
81 ungetc(c, inf);
82 break;
83 case '|':
84 case ';':
85 in_rule = NO;
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 = YES;
105 }
106 else
107 ungetc(c, inf);
108 }
109 }
110
111 /*
112 * toss_yysec --
113 * throw away lines up to the next "\n%%\n"
114 */
115 void
toss_yysec(void)116 toss_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