summaryrefslogtreecommitdiffstats
path: root/common/command.c
blob: 03c70834d181279499fd927a620bd9cf1084020e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/*
 * (C) Copyright 2000-2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

/*
 *  Command Processor Table
 */

#include <common.h>
#include <command.h>
#include <xfuncs.h>
#include <malloc.h>
#include <environment.h>
#include <linux/list.h>
#include <init.h>
#include <complete.h>
#include <getopt.h>

LIST_HEAD(command_list);
EXPORT_SYMBOL(command_list);

void barebox_cmd_usage(struct command *cmdtp)
{
	putchar('\n');
	if (cmdtp->desc)
		printf("%s - %s\n\n", cmdtp->name, cmdtp->desc);
	if (cmdtp->opts)
		printf("Usage: %s %s\n\n", cmdtp->name, cmdtp->opts);
#ifdef CONFIG_LONGHELP
	/* found - print (long) help info */
	if (cmdtp->help) {
		puts(cmdtp->help);
		putchar('\n');
	}
	if (cmdtp->usage)
		cmdtp->usage();
#endif
}
EXPORT_SYMBOL(barebox_cmd_usage);

static int compare(struct list_head *a, struct list_head *b)
{
	char *na = (char*)list_entry(a, struct command, list)->name;
	char *nb = (char*)list_entry(b, struct command, list)->name;

	return strcmp(na, nb);
}

int execute_command(int argc, char **argv)
{
	struct command *cmdtp;
	int ret;
	struct getopt_context gc;

	getopt_context_store(&gc);

	/* Look up command in command table */
	if ((cmdtp = find_cmd(argv[0]))) {
		/* OK - call function to do the command */
		ret = cmdtp->cmd(argc, argv);
		if (ret == COMMAND_ERROR_USAGE) {
			barebox_cmd_usage(cmdtp);
			ret = COMMAND_ERROR;
		}
	} else {
#ifdef CONFIG_CMD_HELP
		printf ("Unknown command '%s' - try 'help'\n", argv[0]);
#else
		printf ("Unknown command '%s'\n", argv[0]);
#endif
		ret = COMMAND_ERROR;	/* give up after bad command */
	}

	getopt_context_restore(&gc);

	return ret;
}

int register_command(struct command *cmd)
{
	/*
	 * We do not check if the command already exists.
	 * This allows us to overwrite a builtin command
	 * with a module.
	 */

	debug("register command %s\n", cmd->name);

	list_add_sort(&cmd->list, &command_list, compare);

	if (cmd->aliases) {
		char **aliases = (char**)cmd->aliases;
		while(*aliases) {
			struct command *c = xzalloc(sizeof(struct command));

			memcpy(c, cmd, sizeof(struct command));

			c->name = *aliases;
			c->desc = cmd->desc;
			c->opts = cmd->opts;

			c->aliases = NULL;

			register_command(c);

			aliases++;
		}
	}

	return 0;
}
EXPORT_SYMBOL(register_command);

/*
 * find command table entry for a command
 */
struct command *find_cmd (const char *cmd)
{
	struct command *cmdtp;

	for_each_command(cmdtp)
		if (!strcmp(cmd, cmdtp->name))
			return cmdtp;

	return NULL;	/* not found or ambiguous command */
}
EXPORT_SYMBOL(find_cmd);

/*
 * Put all commands into a linked list. Without module support we could use
 * the raw command array, but with module support a list is easier to handle.
 * It does not create significant overhead so do it also without module
 * support.
 */
static int init_command_list(void)
{
	struct command *cmdtp;

	for (cmdtp = &__barebox_cmd_start;
			cmdtp != &__barebox_cmd_end;
			cmdtp++)
		register_command(cmdtp);

	return 0;
}

late_initcall(init_command_list);