123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
/*
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* Copyright 2008 Freescale Semiconductor, Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* This file provides a shell like 'expr' function to return.
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*/
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#include <common.h>
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#include <config.h>
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#include <command.h>
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static ulong get_arg(char *s, int w)
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{
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ulong *p;
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/*
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* if the parameter starts with a '*' then assume
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* it is a pointer to the value we want
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*/
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if (s[0] == '*') {
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p = (ulong *)simple_strtoul(&s[1], NULL, 16);
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switch (w) {
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case 1: return((ulong)(*(uchar *)p));
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case 2: return((ulong)(*(ushort *)p));
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case 4:
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default: return(*p);
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}
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} else {
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return simple_strtoul(s, NULL, 16);
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}
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}
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static int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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ulong a, b;
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ulong value;
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int w;
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/* Validate arguments */
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if (argc != 5 && argc != 3)
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return CMD_RET_USAGE;
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if (argc == 5 && strlen(argv[3]) != 1)
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return CMD_RET_USAGE;
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w = cmd_get_data_size(argv[0], 4);
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a = get_arg(argv[2], w);
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if (argc == 3) {
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setenv_hex(argv[1], a);
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return 0;
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}
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b = get_arg(argv[4], w);
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switch (argv[3][0]) {
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case '|':
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value = a | b;
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break;
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case '&':
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value = a & b;
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break;
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case '+':
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value = a + b;
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break;
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case '^':
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value = a ^ b;
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break;
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case '-':
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value = a - b;
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break;
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case '*':
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value = a * b;
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break;
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case '/':
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value = a / b;
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break;
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case '%':
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value = a % b;
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break;
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default:
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printf("invalid op\n");
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return 1;
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}
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setenv_hex(argv[1], value);
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return 0;
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}
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U_BOOT_CMD(
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setexpr, 5, 0, do_setexpr,
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"set environment variable as the result of eval expression",
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"[.b, .w, .l] name [*]value1 <op> [*]value2\n"
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" - set environment variable 'name' to the result of the evaluated\n"
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" express specified by <op>. <op> can be &, |, ^, +, -, *, /, %\n"
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" size argument is only meaningful if value1 and/or value2 are\n"
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" memory addresses (*)\n"
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"setexpr[.b, .w, .l] name *value\n"
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" - load a memory address into a variable"
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);
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