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git.ipfire.org Git - people/ms/u-boot.git/blob - common/cmd_setexpr.c
2 * Copyright 2008 Freescale Semiconductor, Inc.
4 * See file CREDITS for list of people who contributed to this
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.
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.
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,
24 * This file provides a shell like 'expr' function to return.
31 int do_setexpr(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char *argv
[])
36 /* Validate arguments */
37 if ((argc
!= 5) || (strlen(argv
[3]) != 1)) {
42 a
= simple_strtoul(argv
[2], NULL
, 16);
43 b
= simple_strtoul(argv
[4], NULL
, 16);
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;
55 printf("invalid op\n");
65 setexpr
, 5, 0, do_setexpr
,
66 "set environment variable as the result of eval expression",
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 &, |, ^, +, -, *, /, %"