1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/sys/boot/common/interp.c,v 1.30 2008/11/20 14:57:09 luigi Exp $");
29
30 /*
31 * Simple commandline interpreter, toplevel and misc.
32 *
33 * XXX may be obsoleted by BootFORTH or some other, better, interpreter.
34 */
35
36 #include <stand.h>
37 #include <string.h>
38 #include "bootstrap.h"
39
40 #ifdef BOOT_FORTH
41 #include "ficl.h"
42 #define RETURN(x) stackPushINT(bf_vm->pStack,!x); return(x)
43
44 extern FICL_VM *bf_vm;
45 #else
46 #define RETURN(x) return(x)
47 #endif
48
49 #define MAXARGS 20 /* maximum number of arguments allowed */
50
51 static void prompt(void);
52
53 #ifndef BOOT_FORTH
54 static int perform(int argc, char *argv[]);
55
56 /*
57 * Perform the command
58 */
59 int
60 perform(int argc, char *argv[])
61 {
62 int result;
63 struct bootblk_command **cmdp;
64 bootblk_cmd_t *cmd;
65
66 if (argc < 1)
67 return(CMD_OK);
68
69 /* set return defaults; a successful command will override these */
70 command_errmsg = command_errbuf;
71 strcpy(command_errbuf, "no error message");
72 cmd = NULL;
73 result = CMD_ERROR;
74
75 /* search the command set for the command */
76 SET_FOREACH(cmdp, Xcommand_set) {
77 if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*cmdp)->c_name))
78 cmd = (*cmdp)->c_fn;
79 }
80 if (cmd != NULL) {
81 result = (cmd)(argc, argv);
82 } else {
83 command_errmsg = "unknown command";
84 }
85 RETURN(result);
86 }
87 #endif /* ! BOOT_FORTH */
88
89 /*
90 * Interactive mode
91 */
92 void
93 interact(void)
94 {
95 static char input[256]; /* big enough? */
96 #ifndef BOOT_FORTH
97 int argc;
98 char **argv;
99 #endif
100
101 #ifdef BOOT_FORTH
102 bf_init();
103 #endif
104
105 /*
106 * Read our default configuration
107 */
108 if(include("/boot/loader.rc")!=CMD_OK)
109 include("/boot/boot.conf");
110 printf("\n");
111 /*
112 * Before interacting, we might want to autoboot.
113 */
114 autoboot_maybe();
115
116 /*
117 * Not autobooting, go manual
118 */
119 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
120 if (getenv("prompt") == NULL)
121 setenv("prompt", "${interpret}", 1);
122 if (getenv("interpret") == NULL)
123 setenv("interpret", "OK", 1);
124
125
126 for (;;) {
127 input[0] = '\0';
128 prompt();
129 ngets(input, sizeof(input));
130 #ifdef BOOT_FORTH
131 bf_vm->sourceID.i = 0;
132 bf_run(input);
133 #else
134 if (!parse(&argc, &argv, input)) {
135 if (perform(argc, argv))
136 printf("%s: %s\n", argv[0], command_errmsg);
137 free(argv);
138 } else {
139 printf("parse error\n");
140 }
141 #endif
142 }
143 }
144
145 /*
146 * Read commands from a file, then execute them.
147 *
148 * We store the commands in memory and close the source file so that the media
149 * holding it can safely go away while we are executing.
150 *
151 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
152 * that the script won't stop if they fail).
153 */
154 COMMAND_SET(include, "include", "read commands from a file", command_include);
155
156 static int
157 command_include(int argc, char *argv[])
158 {
159 int i;
160 int res;
161 char **argvbuf;
162
163 /*
164 * Since argv is static, we need to save it here.
165 */
166 argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
167 for (i = 0; i < argc; i++)
168 argvbuf[i] = strdup(argv[i]);
169
170 res=CMD_OK;
171 for (i = 1; (i < argc) && (res == CMD_OK); i++)
172 res = include(argvbuf[i]);
173
174 for (i = 0; i < argc; i++)
175 free(argvbuf[i]);
176 free(argvbuf);
177
178 return(res);
179 }
180
181 /*
182 * Header prepended to each line. The text immediately follows the header.
183 * We try to make this short in order to save memory -- the loader has
184 * limited memory available, and some of the forth files are very long.
185 */
186 struct includeline
187 {
188 struct includeline *next;
189 #ifndef BOOT_FORTH
190 int flags;
191 int line;
192 #define SL_QUIET (1<<0)
193 #define SL_IGNOREERR (1<<1)
194 #endif
195 char text[0];
196 };
197
198 int
199 include(const char *filename)
200 {
201 struct includeline *script, *se, *sp;
202 char input[256]; /* big enough? */
203 #ifdef BOOT_FORTH
204 int res;
205 char *cp;
206 int prevsrcid, fd, line;
207 #else
208 int argc,res;
209 char **argv, *cp;
210 int fd, flags, line;
211 #endif
212
213 if (((fd = open(filename, O_RDONLY)) == -1)) {
214 sprintf(command_errbuf,"can't open '%s': %s\n", filename, strerror(errno));
215 return(CMD_ERROR);
216 }
217
218 /*
219 * Read the script into memory.
220 */
221 script = se = NULL;
222 line = 0;
223
224 while (fgetstr(input, sizeof(input), fd) >= 0) {
225 line++;
226 #ifdef BOOT_FORTH
227 cp = input;
228 #else
229 flags = 0;
230 /* Discard comments */
231 if (strncmp(input+strspn(input, " "), "\\ ", 2) == 0)
232 continue;
233 cp = input;
234 /* Echo? */
235 if (input[0] == '@') {
236 cp++;
237 flags |= SL_QUIET;
238 }
239 /* Error OK? */
240 if (input[0] == '-') {
241 cp++;
242 flags |= SL_IGNOREERR;
243 }
244 #endif
245 /* Allocate script line structure and copy line, flags */
246 if (*cp == '\0')
247 continue; /* ignore empty line, save memory */
248 sp = malloc(sizeof(struct includeline) + strlen(cp) + 1);
249 strcpy(sp->text, cp);
250 #ifndef BOOT_FORTH
251 sp->flags = flags;
252 sp->line = line;
253 #endif
254 sp->next = NULL;
255
256 if (script == NULL) {
257 script = sp;
258 } else {
259 se->next = sp;
260 }
261 se = sp;
262 }
263 close(fd);
264
265 /*
266 * Execute the script
267 */
268 #ifndef BOOT_FORTH
269 argv = NULL;
270 #else
271 prevsrcid = bf_vm->sourceID.i;
272 bf_vm->sourceID.i = fd;
273 #endif
274 res = CMD_OK;
275 for (sp = script; sp != NULL; sp = sp->next) {
276
277 #ifdef BOOT_FORTH
278 res = bf_run(sp->text);
279 if (res != VM_OUTOFTEXT) {
280 sprintf(command_errbuf, "Error while including %s, in the line:\n%s", filename, sp->text);
281 res = CMD_ERROR;
282 break;
283 } else
284 res = CMD_OK;
285 #else
286 /* print if not being quiet */
287 if (!(sp->flags & SL_QUIET)) {
288 prompt();
289 printf("%s\n", sp->text);
290 }
291
292 /* Parse the command */
293 if (!parse(&argc, &argv, sp->text)) {
294 if ((argc > 0) && (perform(argc, argv) != 0)) {
295 /* normal command */
296 printf("%s: %s\n", argv[0], command_errmsg);
297 if (!(sp->flags & SL_IGNOREERR)) {
298 res=CMD_ERROR;
299 break;
300 }
301 }
302 free(argv);
303 argv = NULL;
304 } else {
305 printf("%s line %d: parse error\n", filename, sp->line);
306 res=CMD_ERROR;
307 break;
308 }
309 #endif
310 }
311 #ifndef BOOT_FORTH
312 if (argv != NULL)
313 free(argv);
314 #else
315 bf_vm->sourceID.i = prevsrcid;
316 #endif
317 while(script != NULL) {
318 se = script;
319 script = script->next;
320 free(se);
321 }
322 return(res);
323 }
324
325 /*
326 * Emit the current prompt; use the same syntax as the parser
327 * for embedding environment variables.
328 */
329 static void
330 prompt(void)
331 {
332 char *pr, *p, *cp, *ev;
333
334 if ((cp = getenv("prompt")) == NULL)
335 cp = ">";
336 pr = p = strdup(cp);
337
338 while (*p != 0) {
339 if ((*p == '$') && (*(p+1) == '{')) {
340 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
341 ;
342 *cp = 0;
343 ev = getenv(p + 2);
344
345 if (ev != NULL)
346 printf("%s", ev);
347 p = cp + 1;
348 continue;
349 }
350 putchar(*p++);
351 }
352 putchar(' ');
353 free(pr);
354 }
355 Cache object: 353a1f10fd9ccd848841c812d6af7be6
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