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 */
45void
46interact(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 */
94COMMAND_SET(include, "include", "read commands from a file", command_include);
95
96static int
97command_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 */
125void
126interp_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 */
155int
156interp_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