X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fuci.git;a=blobdiff_plain;f=uci_internal.h;h=453aabb241f4922f7655cca9ede0d188d836d2bf;hp=5b496ea06cba7146be5bfff609db3ab613dbd62e;hb=9d8e1fe4857c1c3e8f1a2e2ae59ef9c4790adb39;hpb=14654223268133b5e74ee1748cec2374664ac5bf

diff --git a/uci_internal.h b/uci_internal.h
index 5b496ea..453aabb 100644
--- a/uci_internal.h
+++ b/uci_internal.h
@@ -9,12 +9,15 @@
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * GNU Lesser General Public License for more details.
  */
 
 #ifndef __UCI_INTERNAL_H
 #define __UCI_INTERNAL_H
 
+#define __private __attribute__((visibility("hidden")))
+#define __public
+
 struct uci_parse_context
 {
 	/* error context */
@@ -32,7 +35,218 @@ struct uci_parse_context
 	int bufsz;
 };
 
-static void uci_add_history(struct uci_context *ctx, struct uci_list *list, int cmd, char *section, char *option, char *value);
-static void uci_free_history(struct uci_history *h);
+extern const char *uci_confdir;
+extern const char *uci_savedir;
+
+__private void *uci_malloc(struct uci_context *ctx, size_t size);
+__private void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size);
+__private char *uci_strdup(struct uci_context *ctx, const char *str);
+__private bool uci_validate_str(const char *str, bool name);
+__private void uci_add_delta(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value);
+__private void uci_free_delta(struct uci_delta *h);
+__private struct uci_package *uci_alloc_package(struct uci_context *ctx, const char *name);
+
+__private FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write, bool create);
+__private void uci_close_stream(FILE *stream);
+__private void uci_getln(struct uci_context *ctx, int offset);
+
+__private void uci_parse_error(struct uci_context *ctx, char *pos, char *reason);
+__private void uci_alloc_parse_context(struct uci_context *ctx);
+
+__private void uci_cleanup(struct uci_context *ctx);
+__private struct uci_element *uci_lookup_list(struct uci_list *list, const char *name);
+__private void uci_fixup_section(struct uci_context *ctx, struct uci_section *s);
+__private void uci_free_package(struct uci_package **package);
+__private struct uci_element *uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size);
+__private void uci_free_element(struct uci_element *e);
+__private struct uci_element *uci_expand_ptr(struct uci_context *ctx, struct uci_ptr *ptr, bool complete);
+
+__private int uci_load_delta(struct uci_context *ctx, struct uci_package *p, bool flush);
+
+static inline bool uci_validate_package(const char *str)
+{
+	return uci_validate_str(str, false);
+}
+
+static inline bool uci_validate_type(const char *str)
+{
+	return uci_validate_str(str, false);
+}
+
+static inline bool uci_validate_name(const char *str)
+{
+	return uci_validate_str(str, true);
+}
+
+/* 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 after a given entry */
+static inline void uci_list_insert(struct uci_list *list, struct uci_list *ptr)
+{
+	list->next->prev = ptr;
+	ptr->prev = list;
+	ptr->next = list->next;
+	list->next = ptr;
+}
+
+/* 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_insert(head->prev, ptr);
+}
+
+static inline void uci_list_del(struct uci_list *ptr)
+{
+	struct uci_list *next, *prev;
+
+	next = ptr->next;
+	prev = ptr->prev;
+
+	prev->next = next;
+	next->prev = prev;
+
+	uci_list_init(ptr);
+}
+
+
+extern struct uci_backend uci_file_backend;
+
+#ifdef UCI_PLUGIN_SUPPORT
+/**
+ * uci_add_backend: add an extra backend
+ * @ctx: uci context
+ * @name: name of the backend
+ *
+ * The default backend is "file", which uses /etc/config for config storage
+ */
+__private int uci_add_backend(struct uci_context *ctx, struct uci_backend *b);
+
+/**
+ * uci_add_backend: add an extra backend
+ * @ctx: uci context
+ * @name: name of the backend
+ *
+ * The default backend is "file", which uses /etc/config for config storage
+ */
+__private int uci_del_backend(struct uci_context *ctx, struct uci_backend *b);
+#endif
+
+#define UCI_BACKEND(_var, _name, ...)	\
+struct uci_backend _var = {		\
+	.e.list = {			\
+		.next = &_var.e.list,	\
+		.prev = &_var.e.list,	\
+	},				\
+	.e.name = _name,		\
+	.e.type = UCI_TYPE_BACKEND,	\
+	.ptr = &_var,			\
+	__VA_ARGS__			\
+}
+
+
+/*
+ * functions for debug and error handling, for internal use only
+ */
+
+#ifdef UCI_DEBUG
+#define DPRINTF(...) fprintf(stderr, __VA_ARGS__)
+#else
+#define DPRINTF(...)
+#endif
+
+/* 
+ * throw an uci exception and store the error number
+ * in the context.
+ */
+#define UCI_THROW(ctx, err) do { 	\
+	DPRINTF("Exception: %s in %s, %s:%d\n", #err, __func__, __FILE__, __LINE__); \
+	longjmp(ctx->trap, err); 	\
+} while (0)
+
+/*
+ * store the return address for handling exceptions
+ * needs to be called in every externally visible library function
+ *
+ * NB: this does not handle recursion at all. Calling externally visible
+ * functions from other uci functions is only allowed at the end of the
+ * calling function, or by wrapping the function call in UCI_TRAP_SAVE
+ * and UCI_TRAP_RESTORE.
+ */
+#define UCI_HANDLE_ERR(ctx) do {	\
+	DPRINTF("ENTER: %s\n", __func__); \
+	int __val = 0;			\
+	if (!ctx)			\
+		return UCI_ERR_INVAL;	\
+	ctx->err = 0;			\
+	if (!ctx->internal && !ctx->nested) \
+		__val = setjmp(ctx->trap); \
+	ctx->internal = false;		\
+	ctx->nested = false;		\
+	if (__val) {			\
+		DPRINTF("LEAVE: %s, ret=%d\n", __func__, __val); \
+		ctx->err = __val;	\
+		return __val;		\
+	}				\
+} while (0)
+
+/*
+ * In a block enclosed by UCI_TRAP_SAVE and UCI_TRAP_RESTORE, all exceptions
+ * are intercepted and redirected to the label specified in 'handler'
+ * after UCI_TRAP_RESTORE, or when reaching the 'handler' label, the old
+ * exception handler is restored
+ */
+#define UCI_TRAP_SAVE(ctx, handler) do {   \
+	jmp_buf	__old_trap;		\
+	int __val;			\
+	memcpy(__old_trap, ctx->trap, sizeof(ctx->trap)); \
+	__val = setjmp(ctx->trap);	\
+	if (__val) {			\
+		ctx->err = __val;	\
+		memcpy(ctx->trap, __old_trap, sizeof(ctx->trap)); \
+		goto handler;		\
+	}
+#define UCI_TRAP_RESTORE(ctx)		\
+	memcpy(ctx->trap, __old_trap, sizeof(ctx->trap)); \
+} while(0)
+
+/**
+ * UCI_INTERNAL: Do an internal call of a public API function
+ * 
+ * Sets Exception handling to passthrough mode.
+ * Allows API functions to change behavior compared to public use
+ */
+#define UCI_INTERNAL(func, ctx, ...) do { \
+	ctx->internal = true;		\
+	func(ctx, __VA_ARGS__);		\
+} while (0)
+
+/**
+ * UCI_NESTED: Do an normal nested call of a public API function
+ * 
+ * Sets Exception handling to passthrough mode.
+ * Allows API functions to change behavior compared to public use
+ */
+#define UCI_NESTED(func, ctx, ...) do { \
+	ctx->nested = true;		\
+	func(ctx, __VA_ARGS__);		\
+} while (0)
+
+
+/*
+ * check the specified condition.
+ * throw an invalid argument exception if it's false
+ */
+#define UCI_ASSERT(ctx, expr) do {	\
+	if (!(expr)) {			\
+		DPRINTF("[%s:%d] Assertion failed\n", __FILE__, __LINE__); \
+		UCI_THROW(ctx, UCI_ERR_INVAL);	\
+	}				\
+} while (0)
 
 #endif