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1 | /* |
2 | * ========== Copyright Header Begin ========================================== | |
3 | * | |
4 | * Hypervisor Software File: defines.c | |
5 | * | |
6 | * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. | |
7 | * | |
8 | * - Do no alter or remove copyright notices | |
9 | * | |
10 | * - Redistribution and use of this software in source and binary forms, with | |
11 | * or without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistribution of source code must retain the above copyright notice, | |
15 | * this list of conditions and the following disclaimer. | |
16 | * | |
17 | * - Redistribution in binary form must reproduce the above copyright notice, | |
18 | * this list of conditions and the following disclaimer in the | |
19 | * documentation and/or other materials provided with the distribution. | |
20 | * | |
21 | * Neither the name of Sun Microsystems, Inc. or the names of contributors | |
22 | * may be used to endorse or promote products derived from this software | |
23 | * without specific prior written permission. | |
24 | * | |
25 | * This software is provided "AS IS," without a warranty of any kind. | |
26 | * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, | |
27 | * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A | |
28 | * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN | |
29 | * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR | |
30 | * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR | |
31 | * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN | |
32 | * OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR | |
33 | * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE | |
34 | * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, | |
35 | * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF | |
36 | * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. | |
37 | * | |
38 | * You acknowledge that this software is not designed, licensed or | |
39 | * intended for use in the design, construction, operation or maintenance of | |
40 | * any nuclear facility. | |
41 | * | |
42 | * ========== Copyright Header End ============================================ | |
43 | */ | |
44 | /* | |
45 | * @(#)defines.c 1.3 03/08/20 | |
46 | * Copyright 2001-2003 Sun Microsystems, Inc. All Rights Reserved | |
47 | * Copyright Use is subject to license terms. | |
48 | */ | |
49 | ||
50 | #include <stdio.h> | |
51 | #include <stdlib.h> | |
52 | #include <unistd.h> | |
53 | #include <string.h> | |
54 | ||
55 | #include "defines.h" | |
56 | ||
57 | static define_t *symbol_root = NULL; | |
58 | ||
59 | /* find a symbol by name and return a pointer to it or NULL if not found */ | |
60 | static define_t * | |
61 | find_symbol(char *name) | |
62 | { | |
63 | define_t *found = NULL; | |
64 | define_t *ptr = symbol_root; | |
65 | ||
66 | while (ptr != NULL) { | |
67 | if (strcmp(ptr->name, name) == 0) { | |
68 | found = ptr; | |
69 | break; | |
70 | } | |
71 | ptr = ptr->next; | |
72 | } | |
73 | return (found); | |
74 | } | |
75 | ||
76 | /* | |
77 | * define a symbol, the data part follows the optional '=' sign. | |
78 | * the type is just used to track where the symbol was defined - on the | |
79 | * command line or by upload from the forth engine. | |
80 | */ | |
81 | void | |
82 | define_symbol(char *name, int type) | |
83 | { | |
84 | char *sname, *tname; | |
85 | char *valuep; | |
86 | define_t *new; | |
87 | ||
88 | tname = strdup(name); | |
89 | valuep = strchr(tname, '='); | |
90 | if (valuep != NULL) { | |
91 | *valuep = 0; | |
92 | valuep = strdup(valuep+1); | |
93 | name = strdup(tname); | |
94 | free(tname); | |
95 | } else { | |
96 | name = strdup(name); | |
97 | } | |
98 | new = find_symbol(name); | |
99 | if (new != NULL) { | |
100 | if ((new->type != FORTH_UNDEF) && (new->type != CMD_UNDEF)) { | |
101 | fprintf(stderr, "Warning redefining %s\n", name); | |
102 | } | |
103 | if (new->value != NULL) { | |
104 | free(new->value); | |
105 | } | |
106 | new->value = valuep; | |
107 | new->type = type; | |
108 | free(name); | |
109 | } else { | |
110 | new = malloc(sizeof (define_t)); | |
111 | new->name = name; | |
112 | new->next = symbol_root; | |
113 | new->prev = NULL; | |
114 | new->value = valuep; | |
115 | new->type = type; | |
116 | if (symbol_root != NULL) { | |
117 | symbol_root->prev = new; | |
118 | } | |
119 | symbol_root = new; | |
120 | } | |
121 | } | |
122 | ||
123 | /* | |
124 | * 'un'def a symbol, type tracks where the 'undef' was executed from | |
125 | * either the command line or the forth engine. | |
126 | */ | |
127 | void | |
128 | undef_symbol(char *name, int type) | |
129 | { | |
130 | define_t *which, *prev, *next; | |
131 | ||
132 | which = find_symbol(name); | |
133 | if (which != NULL) { | |
134 | #if 0 | |
135 | prev = which->prev; | |
136 | next = which->next; | |
137 | if (prev != NULL) { | |
138 | prev->next = which->next; | |
139 | } else { | |
140 | symbol_root = next; | |
141 | } | |
142 | next->prev = which->prev; | |
143 | if (which->value != NULL) { | |
144 | free(which->value); | |
145 | } | |
146 | free(which); | |
147 | #endif | |
148 | which->type = type; | |
149 | } else { | |
150 | define_symbol(name, type); | |
151 | } | |
152 | } | |
153 | ||
154 | /* return true/false to test for a symbol existence */ | |
155 | int | |
156 | symbol_defined(char *name) | |
157 | { | |
158 | define_t *found; | |
159 | ||
160 | found = find_symbol(name); | |
161 | ||
162 | return ((found != NULL) && | |
163 | (found->type != FORTH_UNDEF) && | |
164 | (found->type != CMD_UNDEF)); | |
165 | } | |
166 | ||
167 | /* return a pointer to a symbols data, return NULL if there is none. */ | |
168 | char * | |
169 | extract_symbol(char *name) | |
170 | { | |
171 | char *valuep = NULL; | |
172 | define_t *which; | |
173 | ||
174 | which = find_symbol(name); | |
175 | if (which != NULL) { | |
176 | valuep = which->value; | |
177 | } | |
178 | return (valuep); | |
179 | } | |
180 | ||
181 | /* a debug routine to show a symbol, its data and where is was defined */ | |
182 | static void | |
183 | show_symbol(define_t *ptr) | |
184 | { | |
185 | char *value; | |
186 | char *type; | |
187 | ||
188 | switch (ptr->type) { | |
189 | case CMD_DEFINE: | |
190 | type = "[cmd line, defined]"; | |
191 | break; | |
192 | ||
193 | case CMD_UNDEF: | |
194 | type = "[cmd line, undef]"; | |
195 | break; | |
196 | ||
197 | case FORTH_DEFINE: | |
198 | type = "[Forth defined]"; | |
199 | break; | |
200 | ||
201 | case FORTH_UNDEF: | |
202 | type = "[Forth undefined]"; | |
203 | break; | |
204 | default: | |
205 | type = "[invalid define type]"; | |
206 | break; | |
207 | } | |
208 | if (ptr->value == NULL) { | |
209 | value = "[Boolean]"; | |
210 | } else { | |
211 | value = ptr->value; | |
212 | } | |
213 | fprintf(stderr, "%-20.20s %-20.20s %s\n", ptr->name, type, value); | |
214 | } | |
215 | ||
216 | /* | |
217 | * release all resources used by symbols, optionally printing the information | |
218 | * about the symbol use - called when the wrapper exits. | |
219 | */ | |
220 | void | |
221 | finish_symbols(int show) | |
222 | { | |
223 | define_t *ptr = symbol_root; | |
224 | ||
225 | if (show) { | |
226 | fprintf(stderr, "%-20.20s %-20.20s %s\n", | |
227 | "Symbols", "location", "type/value"); | |
228 | } | |
229 | while (ptr != NULL) { | |
230 | define_t *next = ptr->next; | |
231 | if (show) { | |
232 | show_symbol(ptr); | |
233 | } else { | |
234 | if (ptr->value != NULL) { | |
235 | free(ptr->value); | |
236 | } | |
237 | free(ptr->name); | |
238 | free(ptr); | |
239 | } | |
240 | ptr = next; | |
241 | } | |
242 | if (!show) { | |
243 | symbol_root = NULL; | |
244 | } | |
245 | } |