Git Repo - J-u-boot.git/blame_incremental

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Commit	Line	Data
	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
	31	static ulong get_arg(char *s, int w)
	32	{
	33	ulong *p;
	34
	35	/*
	36	* if the parameter starts with a '*' then assume
	37	* it is a pointer to the value we want
	38	*/
	39
	40	if (s[0] == '*') {
	41	p = (ulong *)simple_strtoul(&s[1], NULL, 16);
	42	switch (w) {
	43	case 1: return((ulong)((uchar )p));
	44	case 2: return((ulong)((ushort )p));
	45	case 4:
	46	default: return(*p);
	47	}
	48	} else {
	49	return simple_strtoul(s, NULL, 16);
	50	}
	51	}
	52
	53	int do_setexpr(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	54	{
	55	ulong a, b;
	56	char buf[16];
	57	int w;
	58
	59	/* Validate arguments */
	60	if ((argc != 5) \|\| (strlen(argv[3]) != 1))
	61	return cmd_usage(cmdtp);
	62
	63	w = cmd_get_data_size(argv[0], 4);
	64
	65	a = get_arg(argv[2], w);
	66	b = get_arg(argv[4], w);
	67
	68	switch (argv[3][0]) {
	69	case '\|': sprintf(buf, "%lx", (a \| b)); break;
	70	case '&': sprintf(buf, "%lx", (a & b)); break;
	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	default:
	78	printf("invalid op\n");
	79	return 1;
	80	}
	81
	82	setenv(argv[1], buf);
	83
	84	return 0;
	85	}
	86
	87	U_BOOT_CMD(
	88	setexpr, 5, 0, do_setexpr,
	89	"set environment variable as the result of eval expression",
	90	"[.b, .w, .l] name value1 <op> value2\n"
	91	" - set environment variable 'name' to the result of the evaluated\n"
	92	" express specified by <op>. <op> can be &, \|, ^, +, -, *, /, %\n"
	93	" size argument is only meaningful if value1 and/or value2 are memory addresses"
	94	);