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env: unify logic to check and apply changes

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The logic of checking special parameters (e.g. baudrate, stdin, stdout,
for a valid value and/or whether can be overwritten) and applying the
new value to the running system is now all within a single function
env_check_apply() which can be called whenever changes are made
to the environment, no matter if by set, default or import.

With this patch env_check_apply() is only called by "env set",
retaining previous behavior.

Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
Reviewed-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Gerlando Falauto 2012-08-24 00:11:37 +00:00 committed by Tom Rini
parent c2ba2ff511
commit c3f6525854
2 changed files with 94 additions and 50 deletions
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137
common/cmd_nvedit.c
View file

@ -198,31 +198,19 @@ static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
#endif
/*
* Set a new environment variable,
* or replace or delete an existing one.
* Perform consistency checking before setting, replacing, or deleting an
* environment variable, then (if successful) apply the changes to internals so
* to make them effective. Code for this function was taken out of
* _do_env_set(), which now calls it instead.
* Returns 0 in case of success, 1 in case of failure.
* When (flag & H_FORCE) is set, do not print out any error message and force
* overwriting of write-once variables.
*/
int _do_env_set(int flag, int argc, char * const argv[])
int env_check_apply(const char *name, const char *oldval,
const char *newval, int flag)
{
int i, len;
int console = -1;
char *name, *value, *s;
ENTRY e, *ep;
name = argv[1];
if (strchr(name, '=')) {
printf("## Error: illegal character '=' in variable name"
"\"%s\"\n", name);
return 1;
}
env_id++;
/*
* search if variable with this name already exists
*/
e.key = name;
e.data = NULL;
hsearch_r(e, FIND, &ep, &env_htab);
/* Check for console redirection */
if (strcmp(name, "stdin") == 0)
@ -233,57 +221,73 @@ int _do_env_set(int flag, int argc, char * const argv[])
console = stderr;
if (console != -1) {
if (argc < 3) { /* Cannot delete it! */
if ((newval == NULL) || (*newval == '\0')) {
/* We cannot delete stdin/stdout/stderr */
if ((flag & H_FORCE) == 0)
printf("Can't delete \"%s\"\n", name);
return 1;
}
#ifdef CONFIG_CONSOLE_MUX
if (iomux_doenv(console, argv[2]))
if (iomux_doenv(console, newval))
return 1;
#else
/* Try assigning specified device */
if (console_assign(console, argv[2]) < 0)
if (console_assign(console, newval) < 0)
return 1;
#ifdef CONFIG_SERIAL_MULTI
if (serial_assign(argv[2]) < 0)
if (serial_assign(newval) < 0)
return 1;
#endif
#endif /* CONFIG_CONSOLE_MUX */
}
/*
* Some variables like "ethaddr" and "serial#" can be set only
* once and cannot be deleted; also, "ver" is readonly.
* Some variables like "ethaddr" and "serial#" can be set only once and
* cannot be deleted, unless CONFIG_ENV_OVERWRITE is defined.
*/
if (ep) { /* variable exists */
#ifndef CONFIG_ENV_OVERWRITE
if (oldval != NULL && /* variable exists */
(flag & H_FORCE) == 0) { /* and we are not forced */
if (strcmp(name, "serial#") == 0 ||
(strcmp(name, "ethaddr") == 0
#if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
&& strcmp(ep->data, MK_STR(CONFIG_ETHADDR)) != 0
&& strcmp(oldval, MK_STR(CONFIG_ETHADDR)) != 0
#endif /* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
)) {
printf("Can't overwrite \"%s\"\n", name);
return 1;
}
}
#endif
/*
* When we change baudrate, or we are doing an env default -a
* (which will erase all variables prior to calling this),
* we want the baudrate to actually change - for real.
*/
if (oldval != NULL || /* variable exists */
(flag & H_NOCLEAR) == 0) { /* or env is clear */
/*
* Switch to new baudrate if new baudrate is supported
*/
if (strcmp(name, "baudrate") == 0) {
int baudrate = simple_strtoul(argv[2], NULL, 10);
int baudrate = simple_strtoul(newval, NULL, 10);
int i;
for (i = 0; i < N_BAUDRATES; ++i) {
if (baudrate == baudrate_table[i])
break;
}
if (i == N_BAUDRATES) {
printf("## Baudrate %d bps not supported\n",
baudrate);
if ((flag & H_FORCE) == 0)
printf("## Baudrate %d bps not "
"supported\n", baudrate);
return 1;
}
if (gd->baudrate == baudrate) {
/* If unchanged, we just say it's OK */
return 0;
}
printf("## Switch baudrate to %d bps and"
"press ENTER ...\n", baudrate);
udelay(50000);
@ -299,6 +303,59 @@ int _do_env_set(int flag, int argc, char * const argv[])
}
}
/*
* Some variables should be updated when the corresponding
* entry in the environment is changed
*/
if (strcmp(name, "loadaddr") == 0) {
load_addr = simple_strtoul(newval, NULL, 16);
return 0;
}
#if defined(CONFIG_CMD_NET)
else if (strcmp(name, "bootfile") == 0) {
copy_filename(BootFile, newval, sizeof(BootFile));
return 0;
}
#endif
return 0;
}
/*
* Set a new environment variable,
* or replace or delete an existing one.
*/
int _do_env_set(int flag, int argc, char * const argv[])
{
int i, len;
char *name, *value, *s;
ENTRY e, *ep;
name = argv[1];
value = argv[2];
if (strchr(name, '=')) {
printf("## Error: illegal character '='"
"in variable name \"%s\"\n", name);
return 1;
}
env_id++;
/*
* search if variable with this name already exists
*/
e.key = name;
e.data = NULL;
hsearch_r(e, FIND, &ep, &env_htab);
/*
* Perform requested checks. Notice how since we are overwriting
* a single variable, we need to set H_NOCLEAR
*/
if (env_check_apply(name, ep ? ep->data : NULL, value, H_NOCLEAR)) {
debug("check function did not approve, refusing\n");
return 1;
}
/* Delete only ? */
if (argc < 3 || argv[2] == NULL) {
int rc = hdelete_r(name, &env_htab);
@ -336,20 +393,6 @@ int _do_env_set(int flag, int argc, char * const argv[])
return 1;
}
/*
* Some variables should be updated when the corresponding
* entry in the environment is changed
*/
if (strcmp(argv[1], "loadaddr") == 0) {
load_addr = simple_strtoul(argv[2], NULL, 16);
return 0;
}
#if defined(CONFIG_CMD_NET)
else if (strcmp(argv[1], "bootfile") == 0) {
copy_filename(BootFile, argv[2], sizeof(BootFile));
return 0;
}
#endif
return 0;
}

3
include/search.h
View file

@ -99,6 +99,7 @@ extern int himport_r(struct hsearch_data *__htab,
int __flag);
/* Flags for himport_r() */
#define H_NOCLEAR 1 /* do not clear hash table before importing */
#define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
#define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */
#endif /* search.h */