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authorKumar Gala <galak@kernel.crashing.org>2008-02-14 20:44:42 -0600
committerWolfgang Denk <wd@denx.de>2008-03-25 22:16:15 +0100
commitd058698fd2d9f769ff38ac53c8708b3fdd314f2d (patch)
tree9a41de69112983ebd505483a564df6e74dd69e57 /common/cmd_setexpr.c
parent0d48926c87ec96f974a6ac4034f4a2f2eab3255f (diff)
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Add setexpr command
Add a simple expr style command that will set an env variable as the result of the command. This allows us to do simple math in shell. The following operations are supported: &, |, ^, +, -, *, /. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'common/cmd_setexpr.c')
-rw-r--r--common/cmd_setexpr.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/common/cmd_setexpr.c b/common/cmd_setexpr.c
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+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * This file provides a shell like 'expr' function to return.
+ */
+
+#include <common.h>
+#include <config.h>
+#include <command.h>
+
+int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ ulong a, b;
+ char buf[16];
+
+ /* Validate arguments */
+ if ((argc != 5) || (strlen(argv[3]) != 1)) {
+ printf("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+
+ a = simple_strtoul(argv[2], NULL, 16);
+ b = simple_strtoul(argv[4], NULL, 16);
+
+ switch (argv[3][0]) {
+ case '|': sprintf(buf, "%lx", (a | b)); break;
+ case '&': sprintf(buf, "%lx", (a & b)); break;
+ case '+': sprintf(buf, "%lx", (a + b)); break;
+ case '^': sprintf(buf, "%lx", (a ^ b)); break;
+ case '-': sprintf(buf, "%lx", (a - b)); break;
+ case '*': sprintf(buf, "%lx", (a * b)); break;
+ case '/': sprintf(buf, "%lx", (a / b)); break;
+ case '%': sprintf(buf, "%lx", (a % b)); break;
+ default:
+ printf("invalid op\n");
+ return 1;
+ }
+
+ setenv(argv[1], buf);
+
+ return 0;
+}
+
+U_BOOT_CMD(
+ setexpr, 5, 0, do_setexpr,
+ "setexpr - set environment variable as the result of eval expression\n",
+ "name value1 <op> value2\n"
+ " - set environment variable 'name' to the result of the evaluated\n"
+ " express specified by <op>. <op> can be &, |, ^, +, -, *, /, %\n"
+);