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