Annotation of src/usr.bin/ctags/yacc.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: yacc.c,v 1.3 1995/03/26 20:14:12 glass Exp $ */
2:
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. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)yacc.c 8.3 (Berkeley) 4/2/94";
39: #else
40: static char rcsid[] = "$NetBSD: yacc.c,v 1.3 1995/03/26 20:14:12 glass Exp $";
41: #endif
42: #endif /* not lint */
43:
44: #include <ctype.h>
45: #include <limits.h>
46: #include <stdio.h>
47: #include <string.h>
48:
49: #include "ctags.h"
50:
51: /*
52: * y_entries:
53: * find the yacc tags and put them in.
54: */
55: void
56: y_entries()
57: {
58: int c;
59: char *sp;
60: bool in_rule;
61: char tok[MAXTOKEN];
62:
63: in_rule = NO;
64:
65: while (GETC(!=, EOF))
66: switch (c) {
67: case '\n':
68: SETLINE;
69: /* FALLTHROUGH */
70: case ' ':
71: case '\f':
72: case '\r':
73: case '\t':
74: break;
75: case '{':
76: if (skip_key('}'))
77: in_rule = NO;
78: break;
79: case '\'':
80: case '"':
81: if (skip_key(c))
82: in_rule = NO;
83: break;
84: case '%':
85: if (GETC(==, '%'))
86: return;
87: (void)ungetc(c, inf);
88: break;
89: case '/':
90: if (GETC(==, '*'))
91: skip_comment();
92: else
93: (void)ungetc(c, inf);
94: break;
95: case '|':
96: case ';':
97: in_rule = NO;
98: break;
99: default:
100: if (in_rule || !isalpha(c) && c != '.' && c != '_')
101: break;
102: sp = tok;
103: *sp++ = c;
104: while (GETC(!=, EOF) && (intoken(c) || c == '.'))
105: *sp++ = c;
106: *sp = EOS;
107: getline(); /* may change before ':' */
108: while (iswhite(c)) {
109: if (c == '\n')
110: SETLINE;
111: if (GETC(==, EOF))
112: return;
113: }
114: if (c == ':') {
115: pfnote(tok, lineno);
116: in_rule = YES;
117: }
118: else
119: (void)ungetc(c, inf);
120: }
121: }
122:
123: /*
124: * toss_yysec --
125: * throw away lines up to the next "\n%%\n"
126: */
127: void
128: toss_yysec()
129: {
130: int c; /* read character */
131: int state;
132:
133: /*
134: * state == 0 : waiting
135: * state == 1 : received a newline
136: * state == 2 : received first %
137: * state == 3 : recieved second %
138: */
139: lineftell = ftell(inf);
140: for (state = 0; GETC(!=, EOF);)
141: switch (c) {
142: case '\n':
143: ++lineno;
144: lineftell = ftell(inf);
145: if (state == 3) /* done! */
146: return;
147: state = 1; /* start over */
148: break;
149: case '%':
150: if (state) /* if 1 or 2 */
151: ++state; /* goto 3 */
152: break;
153: default:
154: state = 0; /* reset */
155: break;
156: }
157: }