1 /* $OpenBSD: yacc.c,v 1.9 2012/03/04 04:05:15 fgsch Exp $ */
2 /* $NetBSD: yacc.c,v 1.3 1995/03/26 20:14:12 glass Exp $ */
3
4 /*
5 * Copyright (c) 1987, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <ctype.h>
34 #include <limits.h>
35 #include <stdio.h>
36 #include <string.h>
37
38 #include "ctags.h"
39
40 /*
41 * y_entries:
42 * find the yacc tags and put them in.
43 */
44 void
y_entries(void)45 y_entries(void)
46 {
47 int c;
48 char *sp;
49 bool in_rule;
50 char tok[MAXTOKEN];
51
52 in_rule = NO;
53
54 while (GETC(!=, EOF))
55 switch (c) {
56 case '\n':
57 SETLINE;
58 /* FALLTHROUGH */
59 case ' ':
60 case '\f':
61 case '\r':
62 case '\t':
63 break;
64 case '{':
65 if (skip_key('}'))
66 in_rule = NO;
67 break;
68 case '\'':
69 case '"':
70 if (skip_key(c))
71 in_rule = NO;
72 break;
73 case '%':
74 if (GETC(==, '%'))
75 return;
76 (void)ungetc(c, inf);
77 break;
78 case '/':
79 if (GETC(==, '*'))
80 skip_comment('*');
81 else
82 (void)ungetc(c, inf);
83 break;
84 case '|':
85 case ';':
86 in_rule = NO;
87 break;
88 default:
89 if (in_rule || (!isalpha(c) && c != '.' && c != '_'))
90 break;
91 sp = tok;
92 *sp++ = c;
93 while (GETC(!=, EOF) && (intoken(c) || c == '.'))
94 *sp++ = c;
95 *sp = EOS;
96 get_line(); /* may change before ':' */
97 while (iswhite(c)) {
98 if (c == '\n')
99 SETLINE;
100 if (GETC(==, EOF))
101 return;
102 }
103 if (c == ':') {
104 pfnote(tok, lineno);
105 in_rule = YES;
106 }
107 else
108 (void)ungetc(c, inf);
109 }
110 }
111
112 /*
113 * toss_yysec --
114 * throw away lines up to the next "\n%%\n"
115 */
116 void
toss_yysec(void)117 toss_yysec(void)
118 {
119 int c; /* read character */
120 int state;
121
122 /*
123 * state == 0 : waiting
124 * state == 1 : received a newline
125 * state == 2 : received first %
126 * state == 3 : received second %
127 */
128 lineftell = ftell(inf);
129 for (state = 0; GETC(!=, EOF);)
130 switch (c) {
131 case '\n':
132 ++lineno;
133 lineftell = ftell(inf);
134 if (state == 3) /* done! */
135 return;
136 state = 1; /* start over */
137 break;
138 case '%':
139 if (state) /* if 1 or 2 */
140 ++state; /* goto 3 */
141 break;
142 default:
143 state = 0; /* reset */
144 break;
145 }
146 }
147