1 /*-
2 * Copyright (c) 1998 Michael Smith <[email protected]>
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("$FreeBSD$");
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 #define MAXARGS 20 /* maximum number of arguments allowed */
41
42 /*
43 * Interactive mode
44 */
45 void
interact(void)46 interact(void)
47 {
48 static char input[256]; /* big enough? */
49 const char * volatile interp_identifier;
50
51 TSENTER();
52
53 /*
54 * Because interp_identifier is volatile, it cannot be optimized out by
55 * the compiler as it's considered an externally observable event. This
56 * prevents the compiler from optimizing out our carefully placed
57 * $Interpreter:4th string that userboot may use to determine that
58 * we need to switch interpreters.
59 */
60 interp_identifier = bootprog_interp;
61 interp_init();
62
63 printf("\n");
64
65 /*
66 * Before interacting, we might want to autoboot.
67 */
68 autoboot_maybe();
69
70 /*
71 * Not autobooting, go manual
72 */
73 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
74 if (getenv("prompt") == NULL)
75 setenv("prompt", "${interpret}", 1);
76 if (getenv("interpret") == NULL)
77 setenv("interpret", "OK", 1);
78
79 for (;;) {
80 input[0] = '\0';
81 interp_emit_prompt();
82 ngets(input, sizeof(input));
83 interp_run(input);
84 }
85 }
86
87 /*
88 * Read commands from a file, then execute them.
89 *
90 * We store the commands in memory and close the source file so that the media
91 * holding it can safely go away while we are executing.
92 *
93 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
94 * that the script won't stop if they fail).
95 */
96 COMMAND_SET(include, "include", "read commands from a file", command_include);
97
98 static int
command_include(int argc,char * argv[])99 command_include(int argc, char *argv[])
100 {
101 int i;
102 int res;
103 char **argvbuf;
104
105 /*
106 * Since argv is static, we need to save it here.
107 */
108 argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
109 for (i = 0; i < argc; i++)
110 argvbuf[i] = strdup(argv[i]);
111
112 res=CMD_OK;
113 for (i = 1; (i < argc) && (res == CMD_OK); i++)
114 res = interp_include(argvbuf[i]);
115
116 for (i = 0; i < argc; i++)
117 free(argvbuf[i]);
118 free(argvbuf);
119
120 return(res);
121 }
122
123 /*
124 * Emit the current prompt; use the same syntax as the parser
125 * for embedding environment variables. Does not accept input.
126 */
127 void
interp_emit_prompt(void)128 interp_emit_prompt(void)
129 {
130 char *pr, *p, *cp, *ev;
131
132 if ((cp = getenv("prompt")) == NULL)
133 cp = ">";
134 pr = p = strdup(cp);
135
136 while (*p != 0) {
137 if ((*p == '$') && (*(p+1) == '{')) {
138 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
139 ;
140 *cp = 0;
141 ev = getenv(p + 2);
142
143 if (ev != NULL)
144 printf("%s", ev);
145 p = cp + 1;
146 continue;
147 }
148 putchar(*p++);
149 }
150 putchar(' ');
151 free(pr);
152 }
153
154 /*
155 * Perform a builtin command
156 */
157 int
interp_builtin_cmd(int argc,char * argv[])158 interp_builtin_cmd(int argc, char *argv[])
159 {
160 int result;
161 struct bootblk_command **cmdp;
162 bootblk_cmd_t *cmd;
163
164 if (argc < 1)
165 return(CMD_OK);
166
167 /* set return defaults; a successful command will override these */
168 command_errmsg = command_errbuf;
169 strcpy(command_errbuf, "no error message");
170 cmd = NULL;
171 result = CMD_ERROR;
172
173 /* search the command set for the command */
174 SET_FOREACH(cmdp, Xcommand_set) {
175 if (((*cmdp)->c_name != NULL) && !strcmp(argv[0], (*cmdp)->c_name))
176 cmd = (*cmdp)->c_fn;
177 }
178 if (cmd != NULL) {
179 result = (cmd)(argc, argv);
180 } else {
181 command_errmsg = "unknown command";
182 }
183 return(result);
184 }
185