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Add 'editenv' command

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The editenv command can be used to edit an environment variable.
Editing an environment variable is useful when one wants to tweak an
existing variable, for example fix a typo or change the baudrate in the
'bootargs' environment variable.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
This commit is contained in:
Peter Tyser 2009-10-25 15:12:56 -05:00 committed by Wolfgang Denk
parent b0fa8e5063
commit 246c69225c
4 changed files with 43 additions and 0 deletions
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1
README
View file

@ -620,6 +620,7 @@ The following options need to be configured:
CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
CONFIG_CMD_DTT * Digital Therm and Thermostat
CONFIG_CMD_ECHO echo arguments
CONFIG_CMD_EDITENV edit env variable
CONFIG_CMD_EEPROM * EEPROM read/write support
CONFIG_CMD_ELF * bootelf, bootvx
CONFIG_CMD_SAVEENV saveenv

40
common/cmd_nvedit.c
View file

@ -42,6 +42,9 @@
#include <common.h>
#include <command.h>
#include <environment.h>
#if defined(CONFIG_CMD_EDITENV)
#include <malloc.h>
#endif
#include <watchdog.h>
#include <serial.h>
#include <linux/stddef.h>
@ -502,6 +505,34 @@ int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
}
#endif
/************************************************************************
* Interactively edit an environment variable
*/
#if defined(CONFIG_CMD_EDITENV)
int do_editenv(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
char buffer[CONFIG_SYS_CBSIZE];
char *init_val;
int len;
if (argc < 2) {
cmd_usage(cmdtp);
return 1;
}
/* Set read buffer to initial value or empty sting */
init_val = getenv(argv[1]);
if (init_val)
len = sprintf(buffer, "%s", init_val);
else
buffer[0] = '\0';
readline_into_buffer("edit: ", buffer);
return setenv(argv[1], buffer);
}
#endif /* CONFIG_CMD_EDITENV */
/************************************************************************
* Look up variable from environment,
* return address of storage for that variable,
@ -597,6 +628,15 @@ int envmatch (uchar *s1, int i2)
/**************************************************/
#if defined(CONFIG_CMD_EDITENV)
U_BOOT_CMD(
editenv, 2, 0, do_editenv,
"edit environment variable",
"name\n"
" - edit environment variable 'name'"
);
#endif
U_BOOT_CMD(
printenv, CONFIG_SYS_MAXARGS, 1, do_printenv,
"print environment variables",

1
include/config_cmd_all.h
View file

@ -30,6 +30,7 @@
#define CONFIG_CMD_DOC /* Disk-On-Chip Support */
#define CONFIG_CMD_DTT /* Digital Therm and Thermostat */
#define CONFIG_CMD_ECHO /* echo arguments */
#define CONFIG_CMD_EDITENV /* editenv */
#define CONFIG_CMD_EEPROM /* EEPROM read/write support */
#define CONFIG_CMD_ELF /* ELF (VxWorks) load/boot cmd */
#define CONFIG_CMD_SAVEENV /* saveenv */

1
include/config_cmd_default.h
View file

@ -20,6 +20,7 @@
#define CONFIG_CMD_BOOTD /* bootd */
#define CONFIG_CMD_CONSOLE /* coninfo */
#define CONFIG_CMD_ECHO /* echo arguments */
#define CONFIG_CMD_EDITENV /* editenv */
#define CONFIG_CMD_FPGA /* FPGA configuration Support */
#define CONFIG_CMD_IMI /* iminfo */
#define CONFIG_CMD_ITEST /* Integer (and string) test */