From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 19 Jan 2008 18:46:29 +0000 (+0100)
Subject: add some more list handling
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=4cec5755115eb3c48dc50dfcc5558f71f00d59c6;p=uci.git

add some more list handling
---

diff --git a/err.h b/err.h
index 2800526..469164c 100644
--- a/err.h
+++ b/err.h
@@ -13,7 +13,7 @@
  */
 
 /*
- * functions for debug and error handling
+ * functions for debug and error handling, for internal use only
  */
 
 #ifdef DEBUG
@@ -60,4 +60,3 @@
 	}				\
 } while (0)
 
-
diff --git a/libuci.c b/libuci.c
index c3a8fc0..4dfffff 100644
--- a/libuci.c
+++ b/libuci.c
@@ -42,7 +42,7 @@ static const char *uci_errstr[] = {
 static void *uci_malloc(struct uci_context *ctx, size_t size)
 {
 	void *ptr;
-	
+
 	ptr = malloc(size);
 	if (!ptr)
 		UCI_THROW(ctx, UCI_ERR_MEM);
@@ -63,6 +63,20 @@ static void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
 	return ptr;
 }
 
+/*
+ * UCI wrapper for strdup, which uses exception handling
+ */
+static char *uci_strdup(struct uci_context *ctx, const char *str)
+{
+	char *ptr;
+
+	ptr = strdup(str);
+	if (!ptr)
+		UCI_THROW(ctx, UCI_ERR_MEM);
+
+	return ptr;
+}
+
 #include "list.c"
 #include "parse.c"
 
@@ -71,10 +85,11 @@ static void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
 struct uci_context *uci_alloc(void)
 {
 	struct uci_context *ctx;
-	
+
 	ctx = (struct uci_context *) malloc(sizeof(struct uci_context));
 	memset(ctx, 0, sizeof(struct uci_context));
-	
+	uci_list_init(&ctx->root);
+
 	return ctx;
 }
 
@@ -93,7 +108,7 @@ void uci_perror(struct uci_context *ctx, const char *str)
 		err = UCI_ERR_INVAL;
 	else
 		err = ctx->errno;
-	
+
 	if ((err < 0) || (err >= UCI_ERR_LAST))
 		err = UCI_ERR_UNKNOWN;
 
diff --git a/libuci.h b/libuci.h
index e4990a2..3427526 100644
--- a/libuci.h
+++ b/libuci.h
@@ -50,7 +50,7 @@ extern struct uci_context *uci_alloc(void);
  * uci_perror: Print the last uci error that occured
  * @ctx: uci context
  * @str: string to print before the error message
- */ 
+ */
 extern void uci_perror(struct uci_context *ctx, const char *str);
 
 /**
@@ -74,7 +74,7 @@ int uci_cleanup(struct uci_context *ctx);
 struct uci_context
 {
 	struct uci_list root;
-	
+
 	/* for error handling only */
 	struct uci_parse_context *pctx;
 
@@ -127,7 +127,6 @@ struct uci_option
 #define uci_list_entry(type, ptr) \
 	((struct uci_#type *) ((char *)(ptr) - offsetof(struct uci_#type,list)))
 
-
 #define uci_foreach_entry(type, list, ptr)		\
 	for(ptr = uci_list_entry(type, (list)->next);	\
 		&ptr->list != list;			\
diff --git a/list.c b/list.c
index 43b58f4..f681611 100644
--- a/list.c
+++ b/list.c
@@ -12,3 +12,39 @@
  * GNU General Public License for more details.
  */
 
+/* initialize a list head/item */
+static inline void uci_list_init(struct uci_list *ptr)
+{
+	ptr->prev = ptr;
+	ptr->next = ptr;
+}
+
+/* inserts a new list entry between two consecutive entries */
+static inline void __uci_list_add(struct uci_list *prev, struct uci_list *next, struct uci_list *ptr)
+{
+	prev->next = ptr;
+	next->prev = ptr;
+	ptr->prev = prev;
+	ptr->next = next;
+}
+
+/* inserts a new list entry at the tail of the list */
+static inline void uci_list_add(struct uci_list *head, struct uci_list *ptr)
+{
+	/* NB: head->prev points at the tail */
+	__uci_list_add(head->prev, head, ptr);
+}
+
+
+static struct uci_config *uci_add_file(struct uci_context *ctx, const char *name)
+{
+	struct uci_config *cfg;
+
+	cfg = (struct uci_config *) uci_malloc(ctx, sizeof(struct uci_config));
+	uci_list_init(&cfg->list);
+	uci_list_init(&cfg->sections);
+	cfg->name = uci_strdup(ctx, name);
+	uci_list_add(&ctx->root, &cfg->list);
+
+	return cfg;
+}