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