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Add a simple load option to setexpr

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Make setexpr accept a 2 parameter variant that will simply load a value
into a variable.  This is useful for loading a value from memory.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Joe Hershberger 2012-11-01 16:21:14 +00:00 committed by Tom Rini
parent 2400727318
commit 4823b45da2
1 changed files with 16 additions and 3 deletions
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19
common/cmd_setexpr.c
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@ -57,12 +57,22 @@ static int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
int w;
/* Validate arguments */
if ((argc != 5) || (strlen(argv[3]) != 1))
if (argc != 5 && argc != 3)
return CMD_RET_USAGE;
if (argc == 5 && strlen(argv[3]) != 1)
return CMD_RET_USAGE;
w = cmd_get_data_size(argv[0], 4);
a = get_arg(argv[2], w);
if (argc == 3) {
sprintf(buf, "%lx", a);
setenv(argv[1], buf);
return 0;
}
b = get_arg(argv[4], w);
switch (argv[3][0]) {
@ -87,8 +97,11 @@ static int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
U_BOOT_CMD(
setexpr, 5, 0, do_setexpr,
"set environment variable as the result of eval expression",
"[.b, .w, .l] name value1 <op> value2\n"
"[.b, .w, .l] name [*]value1 <op> [*]value2\n"
" - set environment variable 'name' to the result of the evaluated\n"
" express specified by <op>. <op> can be &, |, ^, +, -, *, /, %\n"
" size argument is only meaningful if value1 and/or value2 are memory addresses"
" size argument is only meaningful if value1 and/or value2 are\n"
" memory addresses (*)\n"
"setexpr[.b, .w, .l] name *value\n"
" - load a memory address into a variable"
);