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/*
* (C) Copyright 2000-2010
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Andreas Heppel <aheppel@sysgo.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <search.h>
#include <errno.h>
#include <malloc.h>
DECLARE_GLOBAL_DATA_PTR;
/************************************************************************
* Default settings to be used when no valid environment is found
*/
#include <env_default.h>
struct hsearch_data env_htab = {
.change_ok = env_flags_validate,
};
static uchar __env_get_char_spec(int index)
{
return *((uchar *)(gd->env_addr + index));
}
uchar env_get_char_spec(int)
__attribute__((weak, alias("__env_get_char_spec")));
static uchar env_get_char_init(int index)
{
/* if crc was bad, use the default environment */
if (gd->env_valid)
return env_get_char_spec(index);
else
return default_environment[index];
}
uchar env_get_char_memory(int index)
{
return *env_get_addr(index);
}
uchar env_get_char(int index)
{
/* if relocated to RAM */
if (gd->flags & GD_FLG_RELOC)
return env_get_char_memory(index);
else
return env_get_char_init(index);
}
const uchar *env_get_addr(int index)
{
if (gd->env_valid)
return (uchar *)(gd->env_addr + index);
else
return &default_environment[index];
}
/*
* Read an environment variable as a boolean
* Return -1 if variable does not exist (default to true)
*/
int getenv_yesno(const char *var)
{
char *s = getenv(var);
if (s == NULL)
return -1;
return (*s == '1' || *s == 'y' || *s == 'Y' || *s == 't' || *s == 'T') ?
1 : 0;
}
/*
* Look up the variable from the default environment
*/
char *getenv_default(const char *name)
{
char *ret_val;
unsigned long really_valid = gd->env_valid;
unsigned long real_gd_flags = gd->flags;
/* Pretend that the image is bad. */
gd->flags &= ~GD_FLG_ENV_READY;
gd->env_valid = 0;
ret_val = getenv(name);
gd->env_valid = really_valid;
gd->flags = real_gd_flags;
return ret_val;
}
void set_default_env(const char *s)
{
int flags = 0;
if (sizeof(default_environment) > ENV_SIZE) {
puts("*** Error - default environment is too large\n\n");
return;
}
if (s) {
if (*s == '!') {
printf("*** Warning - %s, "
"using default environment\n\n",
s + 1);
} else {
flags = H_INTERACTIVE;
puts(s);
}
} else {
puts("Using default environment\n\n");
}
if (himport_r(&env_htab, (char *)default_environment,
sizeof(default_environment), '\0', flags,
0, NULL) == 0)
error("Environment import failed: errno = %d\n", errno);
gd->flags |= GD_FLG_ENV_READY;
}
/* [re]set individual variables to their value in the default environment */
int set_default_vars(int nvars, char * const vars[])
{
/*
* Special use-case: import from default environment
* (and use \0 as a separator)
*/
return himport_r(&env_htab, (const char *)default_environment,
sizeof(default_environment), '\0',
H_NOCLEAR | H_INTERACTIVE, nvars, vars);
}
/*
* Check if CRC is valid and (if yes) import the environment.
* Note that "buf" may or may not be aligned.
*/
int env_import(const char *buf, int check)
{
env_t *ep = (env_t *)buf;
if (check) {
uint32_t crc;
memcpy(&crc, &ep->crc, sizeof(crc));
if (crc32(0, ep->data, ENV_SIZE) != crc) {
set_default_env("!bad CRC");
return 0;
}
}
if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0,
0, NULL)) {
gd->flags |= GD_FLG_ENV_READY;
return 1;
}
error("Cannot import environment: errno = %d\n", errno);
set_default_env("!import failed");
return 0;
}
/* Emport the environment and generate CRC for it. */
int env_export(env_t *env_out)
{
char *res;
ssize_t len;
res = (char *)env_out->data;
len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
if (len < 0) {
error("Cannot export environment: errno = %d\n", errno);
return 1;
}
env_out->crc = crc32(0, env_out->data, ENV_SIZE);
return 0;
}
void env_relocate(void)
{
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
env_reloc();
env_htab.change_ok += gd->reloc_off;
#endif
if (gd->env_valid == 0) {
#if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
/* Environment not changable */
set_default_env(NULL);
#else
bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM);
set_default_env("!bad CRC");
#endif
} else {
env_relocate_spec();
}
}
#if defined(CONFIG_AUTO_COMPLETE) && !defined(CONFIG_SPL_BUILD)
int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
{
ENTRY *match;
int found, idx;
idx = 0;
found = 0;
cmdv[0] = NULL;
while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
int vallen = strlen(match->key) + 1;
if (found >= maxv - 2 || bufsz < vallen)
break;
cmdv[found++] = buf;
memcpy(buf, match->key, vallen);
buf += vallen;
bufsz -= vallen;
}
qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
if (idx)
cmdv[found++] = "...";
cmdv[found] = NULL;
return found;
}
#endif
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