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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 static ulong
get_arg(char *s
, int w
)
36 * if the parameter starts with a '*' then assume
37 * it is a pointer to the value we want
41 p
= (ulong
*)simple_strtoul(&s
[1], NULL
, 16);
43 case 1: return((ulong
)(*(uchar
*)p
));
44 case 2: return((ulong
)(*(ushort
*)p
));
49 return simple_strtoul(s
, NULL
, 16);
53 int do_setexpr(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char *argv
[])
59 /* Validate arguments */
60 if ((argc
!= 5) || (strlen(argv
[3]) != 1)) {
65 w
= cmd_get_data_size(argv
[0], 4);
67 a
= get_arg(argv
[2], w
);
68 b
= get_arg(argv
[4], w
);
71 case '|': sprintf(buf
, "%lx", (a
| b
)); break;
72 case '&': sprintf(buf
, "%lx", (a
& b
)); break;
73 case '+': sprintf(buf
, "%lx", (a
+ b
)); break;
74 case '^': sprintf(buf
, "%lx", (a
^ b
)); break;
75 case '-': sprintf(buf
, "%lx", (a
- b
)); break;
76 case '*': sprintf(buf
, "%lx", (a
* b
)); break;
77 case '/': sprintf(buf
, "%lx", (a
/ b
)); break;
78 case '%': sprintf(buf
, "%lx", (a
% b
)); break;
80 printf("invalid op\n");
90 setexpr
, 5, 0, do_setexpr
,
91 "set environment variable as the result of eval expression",
92 "[.b, .w, .l] name value1 <op> value2\n"
93 " - set environment variable 'name' to the result of the evaluated\n"
94 " express specified by <op>. <op> can be &, |, ^, +, -, *, /, %\n"
95 " size argument is only meaningful if value1 and/or value2 are memory addresses"