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unset variable with ENV{VAR}=""

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This commit is contained in:
Kay Sievers 2007-04-25 01:52:00 +02:00
parent 07bc6002ca
commit db6e59df56
3 changed files with 32 additions and 6 deletions
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1
udev.h
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@ -137,6 +137,7 @@ struct name_entry {
extern int log_priority(const char *priority);
extern char *name_list_add(struct list_head *name_list, const char *name, int sort);
extern char *name_list_key_add(struct list_head *name_list, const char *key, const char *value);
extern int name_list_key_remove(struct list_head *name_list, const char *key);
extern void name_list_cleanup(struct list_head *name_list);
extern int add_matching_files(struct list_head *name_list, const char *dirname, const char *suffix);
extern uid_t lookup_user(const char *user);

13
udev_rules.c
View File

@ -831,18 +831,23 @@ try_parent:
char temp_value[NAME_SIZE];
const char *key_name = key_pair_name(rule, pair);
const char *value = key_val(rule, &pair->key);
char *key_value;
/* make sure we don't write to the same string we possibly read from */
strlcpy(temp_value, value, sizeof(temp_value));
udev_rules_apply_format(udev, temp_value, NAME_SIZE);
key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
if (temp_value[0] == '\0') {
name_list_key_remove(&udev->env_list, key_name);
unsetenv(key_name);
info("unset ENV '%s'", key_name);
} else {
char *key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
if (key_value == NULL)
break;
putenv(key_value);
dbg("export ENV '%s'", key_value);
info("set ENV '%s'", key_value);
}
}
}

20
udev_utils.c
View File

@ -110,6 +110,26 @@ char *name_list_key_add(struct list_head *name_list, const char *key, const char
return new_name->name;
}
int name_list_key_remove(struct list_head *name_list, const char *key)
{
struct name_entry *name_loop;
struct name_entry *temp_loop;
size_t keylen = strlen(key);
int retval = 0;
list_for_each_entry_safe(name_loop, temp_loop, name_list, node) {
if (strncmp(name_loop->name, key, keylen) != 0)
continue;
if (name_loop->name[keylen] != '=')
continue;
list_del(&name_loop->node);
free(name_loop);
retval = 1;
break;
}
return retval;
}
void name_list_cleanup(struct list_head *name_list)
{
struct name_entry *name_loop;