interp.c revision 38764 
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 *	$Id: interp.c,v 1.2 1998/09/01 00:41:24 msmith Exp $
27 */
28/*
29 * Simple commandline interpreter, toplevel and misc.
30 *
31 * XXX may be obsoleted by BootFORTH
32 */
33
34#include <stand.h>
35#include <string.h>
36#include "bootstrap.h"
37
38#define	MAXARGS	20			/* maximum number of arguments allowed */
39
40extern int	parse(int *argc, char ***argv, char *str);	/* interp_parse.c */
41
42static void	prompt(void);
43
44/*
45 * Perform the command
46 */
47static int
48perform(int argc, char *argv[])
49{
50    int				i, result;
51    struct bootblk_command	**cmdp;
52    bootblk_cmd_t		*cmd;
53
54    if (argc < 1)
55	return(CMD_OK);
56
57    /* set return defaults; a successful command will override these */
58    command_errmsg = command_errbuf;
59    strcpy(command_errbuf, "no error message");
60    cmd = NULL;
61    result = CMD_ERROR;
62
63    cmdp = (struct bootblk_command **)Xcommand_set.ls_items;
64    for (i = 0; i < Xcommand_set.ls_length; i++) {
65	if ((cmdp[i]->c_name != NULL) && !strcmp(argv[0], cmdp[i]->c_name))
66	    cmd = cmdp[i]->c_fn;
67    }
68    if (cmd != NULL) {
69	result = (cmd)(argc, argv);
70    } else {
71	command_errmsg = "unknown command";
72    }
73    return(result);
74}
75
76/*
77 * Interactive mode
78 */
79void
80interact(void)
81{
82    char	input[256];			/* big enough? */
83    int		argc;
84    char	**argv;
85
86    /*
87     * Read our default configuration
88     */
89    source("/boot/boot.conf");
90    printf("\n");
91    /*
92     * Before interacting, we might want to autoboot
93     */
94    if (getenv("no_autoboot") == NULL)
95	autoboot(10, NULL);		/* try to boot automatically */
96
97    /*
98     * Not autobooting, go manual
99     */
100    printf("\nType '?' for a list of commands, 'help' for more detailed help.\n");
101    setenv("prompt", "${currdev}>", 1);
102
103
104    for (;;) {
105	input[0] = '\0';
106	prompt();
107	ngets(input, sizeof(input));
108	if (!parse(&argc, &argv, input)) {
109	    if (perform(argc, argv))
110		printf("%s: %s\n", argv[0], command_errmsg);
111	    free(argv);
112	} else {
113	    printf("parse error\n");
114	}
115    }
116}
117
118/*
119 * Read command from a file
120 */
121COMMAND_SET(source, "source", "read commands from a file", command_source);
122
123static int
124command_source(int argc, char *argv[])
125{
126    int		i;
127
128    for (i = 1; i < argc; i++)
129	source(argv[i]);
130    return(CMD_OK);
131}
132
133void
134source(char *filename)
135{
136    char	input[256];			/* big enough? */
137    int		argc;
138    char	**argv, *cp;
139    int		fd;
140
141    if (((fd = open(filename, O_RDONLY)) == -1)) {
142	printf("can't open '%s': %s\n", filename, strerror(errno));
143    } else {
144	while (fgetstr(input, sizeof(input), fd) > 0) {
145
146	    /* Discard comments */
147	    if (input[0] == '#')
148		continue;
149	    cp = input;
150	    /* Echo? */
151	    if (input[0] == '@') {
152		cp++;
153	    } else {
154		prompt();
155		printf("%s\n", input);
156	    }
157
158	    if (!parse(&argc, &argv, cp)) {
159		if ((argc > 0) &&
160		    (perform(argc, argv) != 0))
161		    printf("%s: %s\n", argv[0], command_errmsg);
162		free(argv);
163	    }
164	}
165	close(fd);
166    }
167}
168
169/*
170 * Emit the current prompt; use the same syntax as the parser
171 * for embedding environment variables.
172 */
173static void
174prompt(void)
175{
176    char	*p, *cp, *ev;
177
178    if ((cp = getenv("prompt")) == NULL)
179	cp = ">";
180    p = strdup(cp);
181
182    while (*p != 0) {
183	if ((*p == '$') && (*(p+1) == '{')) {
184	    for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++)
185		;
186	    *cp = 0;
187	    ev = getenv(p + 2);
188
189	    if (ev != NULL)
190		printf(ev);
191	    p = cp + 1;
192	    continue;
193	}
194	putchar(*p++);
195    }
196    putchar(' ');
197}
198