source: SVN/rincon/u-boot/common/cmd_setexpr.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 2 years ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.0 KB
Line 
1/*
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)) {
38                printf("Usage:\n%s\n", cmdtp->usage);
39                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,
66        "setexpr - set environment variable as the result of eval expression\n",
67        "name value1 <op> value2\n"
68        "    - set environment variable 'name' to the result of the evaluated\n"
69        "      express specified by <op>.  <op> can be &, |, ^, +, -, *, /, %\n"
70);
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