2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 * Simple commandline interpreter, toplevel and misc.
33 * XXX may be obsoleted by BootFORTH or some other, better, interpreter.
38 #include "bootstrap.h"
40 #define MAXARGS 20 /* maximum number of arguments allowed */
42 const char * volatile interp_identifier;
50 static char input[256]; /* big enough? */
55 * Because interp_identifier is volatile, it cannot be optimized out by
56 * the compiler as it's considered an externally observable event. This
57 * prevents the compiler from optimizing out our carefully placed
58 * $Interpreter:4th string that userboot may use to determine that
59 * we need to switch interpreters.
61 interp_identifier = bootprog_interp;
67 * Before interacting, we might want to autoboot.
72 * Not autobooting, go manual
74 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
75 if (getenv("prompt") == NULL)
76 setenv("prompt", "${interpret}", 1);
77 if (getenv("interpret") == NULL)
78 setenv("interpret", "OK", 1);
83 ngets(input, sizeof(input));
89 * Read commands from a file, then execute them.
91 * We store the commands in memory and close the source file so that the media
92 * holding it can safely go away while we are executing.
94 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so
95 * that the script won't stop if they fail).
97 COMMAND_SET(include, "include", "read commands from a file", command_include);
100 command_include(int argc, char *argv[])
107 * Since argv is static, we need to save it here.
109 argvbuf = (char**) calloc((u_int)argc, sizeof(char*));
110 for (i = 0; i < argc; i++)
111 argvbuf[i] = strdup(argv[i]);
114 for (i = 1; (i < argc) && (res == CMD_OK); i++)
115 res = interp_include(argvbuf[i]);
117 for (i = 0; i < argc; i++)
125 * Emit the current prompt; use the same syntax as the parser
126 * for embedding environment variables. Does not accept input.
129 interp_emit_prompt(void)
131 char *pr, *p, *cp, *ev;
133 if ((cp = getenv("prompt")) == NULL)
138 if ((*p == '$') && (*(p+1) == '{')) {
139 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
155 static struct bootblk_command *
156 interp_lookup_cmd(const char *cmd)
158 struct bootblk_command **cmdp;
160 /* search the command set for the command */
161 SET_FOREACH(cmdp, Xcommand_set) {
162 if (((*cmdp)->c_name != NULL) && !strcmp(cmd, (*cmdp)->c_name))
169 * Perform a builtin command
172 interp_builtin_cmd(int argc, char *argv[])
175 struct bootblk_command *cmd;
180 /* set return defaults; a successful command will override these */
181 command_errmsg = command_errbuf;
182 strcpy(command_errbuf, "no error message");
185 cmd = interp_lookup_cmd(argv[0]);
186 if (cmd != NULL && cmd->c_fn) {
187 result = cmd->c_fn(argc, argv);
189 command_errmsg = "unknown command";
195 * Return true if the builtin command exists
198 interp_has_builtin_cmd(const char *cmd)
200 return (interp_lookup_cmd(cmd) != NULL);