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Kumar Galad0586982008-02-14 20:44:42 -06001/*
2 * Copyright 2008 Freescale Semiconductor, Inc.
3 *
4 * See file CREDITS for list of people who contributed to this
5 * project.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20 * MA 02111-1307 USA
21 */
22
23/*
24 * This file provides a shell like 'expr' function to return.
25 */
26
27#include <common.h>
28#include <config.h>
29#include <command.h>
30
31int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
32{
33 ulong a, b;
34 char buf[16];
35
36 /* Validate arguments */
37 if ((argc != 5) || (strlen(argv[3]) != 1)) {
Peter Tyser62c3ae72009-01-27 18:03:10 -060038 cmd_usage(cmdtp);
Kumar Galad0586982008-02-14 20:44:42 -060039 return 1;
40 }
41
42 a = simple_strtoul(argv[2], NULL, 16);
43 b = simple_strtoul(argv[4], NULL, 16);
44
45 switch (argv[3][0]) {
46 case '|': sprintf(buf, "%lx", (a | b)); break;
47 case '&': sprintf(buf, "%lx", (a & b)); break;
48 case '+': sprintf(buf, "%lx", (a + b)); break;
49 case '^': sprintf(buf, "%lx", (a ^ b)); break;
50 case '-': sprintf(buf, "%lx", (a - b)); break;
51 case '*': sprintf(buf, "%lx", (a * b)); break;
52 case '/': sprintf(buf, "%lx", (a / b)); break;
53 case '%': sprintf(buf, "%lx", (a % b)); break;
54 default:
55 printf("invalid op\n");
56 return 1;
57 }
58
59 setenv(argv[1], buf);
60
61 return 0;
62}
63
64U_BOOT_CMD(
65 setexpr, 5, 0, do_setexpr,
Peter Tyser2fb26042009-01-27 18:03:12 -060066 "set environment variable as the result of eval expression",
Kumar Galad0586982008-02-14 20:44:42 -060067 "name value1 <op> value2\n"
68 " - set environment variable 'name' to the result of the evaluated\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +020069 " express specified by <op>. <op> can be &, |, ^, +, -, *, /, %"
Kumar Galad0586982008-02-14 20:44:42 -060070);