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