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
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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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36 * $FreeBSD: src/usr.bin/yacc/symtab.c,v 1.6 1999/08/28 01:08:03 peter Exp $
38 * @(#)symtab.c 5.3 (Berkeley) 6/1/90
45 /* TABLE_SIZE is the number of entries in the symbol table. */
46 /* TABLE_SIZE must be a power of two. */
48 #define TABLE_SIZE 1024
50 static int hash(const char *);
52 bucket **symbol_table;
58 hash(const char *name)
63 assert(name && *name);
67 k = (31*k + c) & (TABLE_SIZE - 1);
74 make_bucket(const char *name)
79 bp = (bucket *) MALLOC(sizeof(bucket));
80 if (bp == NULL) no_space();
83 bp->name = MALLOC(strlen(name) + 1);
84 if (bp->name == 0) no_space();
86 bp->value = UNDEFINED;
92 if (bp->name == 0) no_space();
93 strcpy(bp->name, name);
104 bpp = symbol_table + hash(name);
109 if (strcmp(name, bp->name) == 0) return (bp);
114 *bpp = bp = make_bucket(name);
115 last_symbol->next = bp;
123 create_symbol_table(void)
128 symbol_table = (bucket **) MALLOC(TABLE_SIZE*sizeof(bucket *));
129 if (symbol_table == NULL) no_space();
130 for (i = 0; i < TABLE_SIZE; i++)
131 symbol_table[i] = NULL;
133 bp = make_bucket("error");
139 symbol_table[hash("error")] = bp;
144 free_symbol_table(void)
156 for (p = first_symbol; p; p = q)