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/*
* env.c - environment variables storage
*
* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* 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 version 2
* as published by the Free Software Foundation.
*
* 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
*/
#include <common.h>
#include <command.h>
#include <driver.h>
#include <malloc.h>
#include <xfuncs.h>
#include <errno.h>
struct variable_d {
struct variable_d *next;
char data[0];
};
#define VARIABLE_D_SIZE(name, value) (sizeof(struct variable_d) + strlen(name) + strlen(value) + 2)
static struct variable_d _env_list;
static struct variable_d *env_list = &_env_list;
static char *var_val(struct variable_d *var)
{
return &var->data[strlen(var->data) + 1];
}
static char *var_name(struct variable_d *var)
{
return var->data;
}
const char *getenv (const char *name)
{
struct variable_d *var;
if (strchr(name, '.')) {
const char *ret = 0;
char *devstr = strdup(name);
char *par = strchr(devstr, '.');
struct device_d *dev;
*par = 0;
dev = get_device_by_id(devstr);
if (dev) {
par++;
ret = dev_get_param(dev, par);
}
free(devstr);
return ret;
}
var = env_list->next;
while (var) {
if (!strcmp(var_name(var), name))
return var_val(var);
var = var->next;
}
return 0;
}
int setenv (const char *name, const char *value)
{
struct variable_d *var = env_list;
struct variable_d *newvar = NULL;
char *par;
if ((par = strchr(name, '.'))) {
struct device_d *dev;
*par++ = 0;
dev = get_device_by_id(name);
if (dev) {
int ret = dev_set_param(dev, par, value);
if (ret < 0)
perror("set parameter");
errno = 0;
} else {
errno = -ENODEV;
perror("set parameter");
}
return errno;
}
if (value) {
newvar = xzalloc(VARIABLE_D_SIZE(name, value));
strcpy(&newvar->data[0], name);
strcpy(&newvar->data[strlen(name) + 1], value);
}
while (var->next) {
if (!strcmp(var->next->data, name)) {
if (value) {
newvar->next = var->next->next;
free(var->next);
var->next = newvar;
return 0;
} else {
struct variable_d *tmp;
tmp = var->next;
var->next = var->next->next;
free(var->next);
return 0;
}
}
var = var->next;
}
var->next = newvar;
return 0;
}
int do_printenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
struct variable_d *var = env_list->next;
if (argc == 2) {
const char *val = getenv(argv[1]);
if (val) {
printf("%s=%s\n", argv[1], val);
return 0;
}
printf("## Error: \"%s\" not defined\n", argv[1]);
return -EINVAL;
}
while (var) {
printf("%s=%s\n", var_name(var), var_val(var));
var = var->next;
}
return 0;
}
U_BOOT_CMD_START(printenv)
.maxargs = CONFIG_MAXARGS,
.cmd = do_printenv,
.usage = "print environment variables",
U_BOOT_CMD_HELP(
"\n - print values of all environment variables\n"
"printenv name ...\n"
" - print value of environment variable 'name'\n")
U_BOOT_CMD_END
#ifdef CONFIG_SIMPLE_PARSER
int do_setenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
if (argc < 2) {
printf ("Usage:\n%s\n", cmdtp->usage);
return 1;
}
setenv(argv[1], argv[2]);
return 0;
}
U_BOOT_CMD_START(setenv)
.maxargs = CONFIG_MAXARGS,
.cmd = do_setenv,
.usage = "set environment variables",
U_BOOT_CMD_HELP(
"name value ...\n"
" - set environment variable 'name' to 'value ...'\n"
"setenv name\n"
" - delete environment variable 'name'\n")
U_BOOT_CMD_END
#endif
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