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https://github.com/AsahiLinux/u-boot
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4c12eeb8b5
Change all files in common/ to use CMD_RET_USAGE instead of calling cmd_usage() directly. I'm not completely sure about this patch since the code since impact is small (100 byte or so on ARM) and it might need splitting into smaller patches. But for now here it is. Signed-off-by: Simon Glass <sjg@chromium.org>
94 lines
2.5 KiB
C
94 lines
2.5 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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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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char buf[16];
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int w;
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/* Validate arguments */
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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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b = get_arg(argv[4], w);
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switch (argv[3][0]) {
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case '|': sprintf(buf, "%lx", (a | b)); break;
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case '&': sprintf(buf, "%lx", (a & b)); break;
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case '+': sprintf(buf, "%lx", (a + b)); break;
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case '^': sprintf(buf, "%lx", (a ^ b)); break;
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case '-': sprintf(buf, "%lx", (a - b)); break;
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case '*': sprintf(buf, "%lx", (a * b)); break;
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case '/': sprintf(buf, "%lx", (a / b)); break;
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case '%': sprintf(buf, "%lx", (a % b)); 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(argv[1], buf);
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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 memory addresses"
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);
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