lib/param_list: Add new parameter list routines

[petitboot] / lib / param_list / param_list.c

diff --git a/lib/param_list/param_list.c b/lib/param_list/param_list.c
new file mode 100644 (file)
index 0000000..b3a45f8
--- /dev/null
+++ b/lib/param_list/param_list.c
@@ -0,0 +1,118 @@
+
+#define _GNU_SOURCE
+
+#include <assert.h>
+#include <string.h>
+
+#include <log/log.h>
+#include <talloc/talloc.h>
+#include <param_list/param_list.h>
+
+const char **common_known_params(void)
+{
+       static const char *common[] = {
+               "auto-boot?",
+               "petitboot,network",
+               "petitboot,timeout",
+               "petitboot,bootdevs",
+               "petitboot,language",
+               "petitboot,debug?",
+               "petitboot,write?",
+               "petitboot,snapshots?",
+               "petitboot,console",
+               "petitboot,http_proxy",
+               "petitboot,https_proxy",
+               NULL,
+       };
+
+       return common;
+}
+
+void param_list_init(struct param_list *pl, const char *known_params[])
+{
+       assert(known_params);
+       list_init(&pl->params);
+       pl->known_params = known_params;
+}
+
+bool param_list_is_known_n(const struct param_list *pl, const char *name,
+       unsigned int name_len)
+{
+       const char **known;
+
+       assert(pl->known_params);
+
+       param_list_for_each_known_param(pl, known) {
+               if (name_len == strlen(*known) && !strncmp(name, *known, name_len)) {
+                       return true;
+               }
+       }
+
+       return false;
+}
+
+bool param_list_is_known(const struct param_list *pl, const char *name)
+{
+       const char **known;
+
+       assert(pl->known_params);
+
+       param_list_for_each_known_param(pl, known) {
+               if (!strcmp(name, *known)) {
+                       return true;
+               }
+       }
+
+       return false;
+}
+
+struct param *param_list_get_param(struct param_list *pl, const char *name)
+{
+       struct param *param;
+
+       param_list_for_each(pl, param) {
+               if (!strcmp(param->name, name))
+                       return param;
+       }
+       return NULL;
+}
+
+void param_list_set(struct param_list *pl, const char *name, const char *value,
+       bool modified_on_create)
+{
+       struct param *param;
+
+       param_list_for_each(pl, param) {
+               if (strcmp(param->name, name))
+                       continue;
+
+               if (!strcmp(param->value, value))
+                       return;
+
+               /* Update existing list entry. */
+               talloc_free(param->value);
+               param->value = talloc_strdup(param, value);
+               param->modified = true;
+               pb_debug_fn("Updated: %s:%s\n", name, value);
+               return;
+       }
+
+       /* Add new entry to list. */
+       param = talloc(pl, struct param);
+       param->modified = modified_on_create;
+       param->name = talloc_strdup(pl, name);
+       param->value = talloc_strdup(pl, value);
+       list_add(&pl->params, &param->list);
+       pb_debug_fn("Created: %s:%s\n", name, value);
+}
+
+void param_list_set_non_empty(struct param_list *pl, const char *name, const char *value,
+       bool modified_on_create)
+{
+       if (!param_list_get_value(pl, name) && !strlen(value)) {
+               return;
+       }
+
+       param_list_set(pl, name, value, modified_on_create);
+}
+