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 * 4. 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.
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)
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static char sccsid[] = "@(#)symtab.c 5.3 (Berkeley) 6/1/90";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
46 /* TABLE_SIZE is the number of entries in the symbol table. */
47 /* TABLE_SIZE must be a power of two. */
49 #define TABLE_SIZE 1024
51 static int hash(const char *);
53 bucket **symbol_table;
59 hash(const char *name)
64 assert(name && *name);
68 k = (31*k + c) & (TABLE_SIZE - 1);
75 make_bucket(const char *name)
80 bp = malloc(sizeof(bucket));
81 if (bp == 0) no_space();
84 bp->name = malloc(strlen(name) + 1);
85 if (bp->name == 0) no_space();
87 bp->value = UNDEFINED;
93 if (bp->name == 0) no_space();
94 strcpy(bp->name, name);
105 bpp = symbol_table + hash(name);
110 if (strcmp(name, bp->name) == 0) return (bp);
115 *bpp = bp = make_bucket(name);
116 last_symbol->next = bp;
124 create_symbol_table(void)
129 symbol_table = malloc(TABLE_SIZE*sizeof(bucket *));
130 if (symbol_table == 0) no_space();
131 for (i = 0; i < TABLE_SIZE; i++)
134 bp = make_bucket("error");
140 symbol_table[hash("error")] = bp;
145 free_symbol_table(void)
157 for (p = first_symbol; p; p = q)