2 * Copyright (c) 1989 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 static char sccsid
[] = "@(#)symtab.c 5.3 (Berkeley) 6/1/90";
43 /* TABLE_SIZE is the number of entries in the symbol table. */
44 /* TABLE_SIZE must be a power of two. */
46 #define TABLE_SIZE 1024
49 bucket
**symbol_table
;
54 hash (const char *name
)
59 assert(name
&& *name
);
63 k
= (31*k
+ c
) & (TABLE_SIZE
- 1);
69 make_bucket (const char *name
)
74 bp
= (bucket
*) MALLOC(sizeof(bucket
));
75 if (bp
== 0) no_space();
78 bp
->name
= (char*)MALLOC(strlen(name
) + 1);
79 if (bp
->name
== 0) no_space();
81 bp
->value
= UNDEFINED
;
87 if (bp
->name
== 0) no_space();
88 strcpy(bp
->name
, name
);
94 lookup (const char *name
)
96 register bucket
*bp
, **bpp
;
98 bpp
= symbol_table
+ hash(name
);
103 if (strcmp(name
, bp
->name
) == 0) return (bp
);
108 *bpp
= bp
= make_bucket(name
);
109 last_symbol
->next
= bp
;
116 create_symbol_table (void)
121 symbol_table
= (bucket
**) MALLOC(TABLE_SIZE
*sizeof(bucket
*));
122 if (symbol_table
== 0) no_space();
123 for (i
= 0; i
< TABLE_SIZE
; i
++)
126 bp
= make_bucket("error");
132 symbol_table
[hash("error")] = bp
;
136 free_symbol_table (void)
145 register bucket
*p
, *q
;
147 for (p
= first_symbol
; p
; p
= q
)