X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fuci.git;a=blobdiff_plain;f=uci.h;h=fe05bb3cc34138bd531e22461d1011bd1ceea110;hp=a34a36bb4b3095451dfd55a2bcb2d09a25bb26bf;hb=87e893157980abef163575ad7aedbcc96c41b0c6;hpb=9487b850844e4fb873b90cf357c2d0367ebc065c

diff --git a/uci.h b/uci.h
index a34a36b..fe05bb3 100644
--- a/uci.h
+++ b/uci.h
@@ -2,9 +2,9 @@
  * libuci - Library for the Unified Configuration Interface
  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
  *
- * this program is free software; you can redistribute it and/or modify
- * it under the terms of the gnu lesser general public license version 2.1
- * as published by the free software foundation
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -15,10 +15,25 @@
 #ifndef __LIBUCI_H
 #define __LIBUCI_H
 
+#include "uci_config.h"
+
+/*
+ * you can use these defines to enable debugging behavior for
+ * apps compiled against libuci:
+ *
+ * #define UCI_DEBUG_TYPECAST:
+ *   enable uci_element typecast checking at run time
+ *
+ */
+
+#include <stdbool.h>
 #include <setjmp.h>
 #include <stdio.h>
 
 #define UCI_CONFDIR "/etc/config"
+#define UCI_SAVEDIR "/tmp/.uci"
+#define UCI_DIRMODE 0700
+#define UCI_FILEMODE 0600
 
 enum
 {
@@ -28,31 +43,38 @@ enum
 	UCI_ERR_NOTFOUND,
 	UCI_ERR_IO,
 	UCI_ERR_PARSE,
+	UCI_ERR_DUPLICATE,
 	UCI_ERR_UNKNOWN,
 	UCI_ERR_LAST
 };
 
+struct uci_list;
 struct uci_list
 {
-	void *next;
-	void *prev;
+	struct uci_list *next;
+	struct uci_list *prev;
 };
 
-struct uci_config;
+struct uci_ptr;
+struct uci_element;
+struct uci_package;
 struct uci_section;
 struct uci_option;
+struct uci_history;
+struct uci_context;
+struct uci_backend;
 struct uci_parse_context;
 
 
 /**
- * uci_alloc: Allocate a new uci context
+ * uci_alloc_context: Allocate a new uci context
  */
-extern struct uci_context *uci_alloc(void);
+extern struct uci_context *uci_alloc_context(void);
 
 /**
- * uci_free: Free the uci context including all of its data
+ * uci_free_context: Free the uci context including all of its data
  */
-extern void uci_free(struct uci_context *ctx);
+extern void uci_free_context(struct uci_context *ctx);
 
 /**
  * uci_perror: Print the last uci error that occured
@@ -66,51 +88,287 @@ extern void uci_perror(struct uci_context *ctx, const char *str);
  * @ctx: uci context
  * @stream: file stream to import from
  * @name: (optional) assume the config has the given name
- * @cfg: (optional) store the last parsed config package in this variable
+ * @package: (optional) store the last parsed config package in this variable
+ * @single: ignore the 'package' keyword and parse everything into a single package
  *
  * the name parameter is for config files that don't explicitly use the 'package <...>' keyword
+ * if 'package' points to a non-null struct pointer, enable history tracking and merge 
  */
-extern int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_config **cfg);
+extern int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single);
 
 /**
  * uci_export: Export one or all uci config packages
  * @ctx: uci context
  * @stream: output stream
- * @cfg: (optional) uci config package to export
+ * @package: (optional) uci config package to export
+ * @header: include the package header
  */
-extern int uci_export(struct uci_context *ctx, FILE *stream, struct uci_config *cfg);
+extern int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header);
 
 /**
  * uci_load: Parse an uci config file and store it in the uci context
  *
  * @ctx: uci context
  * @name: name of the config file (relative to the config directory)
+ * @package: store the loaded config package in this variable
  */
-extern int uci_load(struct uci_context *ctx, const char *name, struct uci_config **cfg);
+extern int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package);
 
 /**
  * uci_unload: Unload a config file from the uci context
  *
  * @ctx: uci context
- * @name: name of the config file
+ * @package: pointer to the uci_package struct
  */
-extern int uci_unload(struct uci_context *ctx, const char *name);
+extern int uci_unload(struct uci_context *ctx, struct uci_package *p);
 
 /**
- * uci_cleanup: Clean up after an error
+ * uci_lookup: Look up an uci element
  *
  * @ctx: uci context
+ * @res: where to store the result
+ * @package: uci_package struct 
+ * @section: config section (optional)
+ * @option: option to search for (optional)
+ *
+ * If section is omitted, then a pointer to the config package is returned
+ * If option is omitted, then a pointer to the config section is returned
+ */
+extern int uci_lookup(struct uci_context *ctx, struct uci_element **res, struct uci_package *package, const char *section, const char *option);
+
+/**
+ * uci_lookup_ptr: Split an uci tuple string and look up elements
+ * @ctx: uci context
+ * @ptr: lookup result struct
+ * @str: uci tuple string to look up
+ * @extended: allow extended syntax lookup
+ */
+extern int uci_lookup_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str, bool extended);
+
+/**
+ * uci_lookup_ext: Extended lookup for an uci element
+ *
+ * @ctx: uci context
+ * @res: where to store the result
+ * @ptr: uci pointer tuple
+ *
+ * Looks up an element using the extended syntax.
+ * It can look up sections by an index with an optional type.
+ *
+ * Examples:
+ *   network.@interface[0].ifname ('ifname' option of the first interface section)
+ *   network.@interface[-1]       (last interface section)
+ * Note: uci_lookup_ext will automatically load a config package if necessary
+ */
+extern int uci_lookup_ext(struct uci_context *ctx, struct uci_element **res, char *ptr);
+
+/**
+ * uci_add_section: Add an unnamed section
+ * @ctx: uci context
+ * @p: package to add the section to
+ * @type: section type
+ * @res: pointer to store a reference to the new section in
+ */
+extern int uci_add_section(struct uci_context *ctx, struct uci_package *p, const char *type, struct uci_section **res);
+
+/**
+ * uci_set_element_value: Replace an element's value with a new one
+ * @ctx: uci context
+ * @element: pointer to an uci_element struct pointer
+ * @value: new value
+ * 
+ * Only valid for uci_option and uci_section. Will replace the type string
+ * when used with an uci_section
+ */
+extern int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, const char *value);
+
+/**
+ * uci_add_element_list: Append a string to a list option
+ * @ctx: uci context
+ * @option: pointer to the uci option element
+ * @value: string to append
+ */
+extern int uci_add_element_list(struct uci_context *ctx, struct uci_option *o, const char *value);
+
+/**
+ * uci_set: Set an element's value; create the element if necessary
+ * @ctx: uci context
+ * @package: package name
+ * @section: section name
+ * @option: option name
+ * @value: value (option) or type (section)
+ * @result: store the updated element in this variable (optional)
+ */
+extern int uci_set(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option, const char *value, struct uci_element **result);
+
+/**
+ * uci_add_list: Append a string to an element list
+ * @ctx: uci context
+ * @package: package name
+ * @section: section name
+ * @option: option name
+ * @value: string value
+ * @result: store the updated element in this variable (optional)
+ *
+ * Note: if the given option already contains a string, convert it to an 1-element-list
+ * before appending the next element
+ */
+extern int uci_add_list(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option, const char *value, struct uci_option **result);
+
+/**
+ * uci_rename: Rename an element
+ * @ctx: uci context
+ * @package: package name
+ * @section: section name
+ * @option: option name
+ * @name: new name
+ */
+extern int uci_rename(struct uci_context *ctx, struct uci_package *p, char *section, char *option, char *name);
+
+/**
+ * uci_delete_element: Delete a section or option
+ * @ctx: uci context
+ * @e: element (section or option)
  */
-extern int uci_cleanup(struct uci_context *ctx);
+extern int uci_delete_element(struct uci_context *ctx, struct uci_element *e);
+
+/**
+ * uci_delete: Delete a section or option
+ * @ctx: uci context
+ * @p: uci package
+ * @section: section name
+ * @option: option name (optional)
+ */
+extern int uci_delete(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option);
+
+/**
+ * uci_save: save change history for a package
+ * @ctx: uci context
+ * @p: uci_package struct
+ */
+extern int uci_save(struct uci_context *ctx, struct uci_package *p);
+
+/**
+ * uci_commit: commit changes to a package
+ * @ctx: uci context
+ * @p: uci_package struct pointer
+ * @overwrite: overwrite existing config data and flush history
+ *
+ * committing may reload the whole uci_package data,
+ * the supplied pointer is updated accordingly
+ */
+extern int uci_commit(struct uci_context *ctx, struct uci_package **p, bool overwrite);
 
 /**
  * uci_list_configs: List available uci config files
+ * @ctx: uci context
  *
+ * caller is responsible for freeing the allocated memory behind list
+ */
+extern int uci_list_configs(struct uci_context *ctx, char ***list);
+
+/** 
+ * uci_set_savedir: override the default history save directory
+ * @ctx: uci context
+ * @dir: directory name
+ */
+extern int uci_set_savedir(struct uci_context *ctx, const char *dir);
+
+/** 
+ * uci_set_savedir: override the default config storage directory
+ * @ctx: uci context
+ * @dir: directory name
+ */
+extern int uci_set_confdir(struct uci_context *ctx, const char *dir);
+
+/**
+ * uci_add_history_path: add a directory to the search path for change history files
+ * @ctx: uci context
+ * @dir: directory name
+ *
+ * This function allows you to add directories, which contain 'overlays'
+ * for the active config, that will never be committed.
+ */
+extern int uci_add_history_path(struct uci_context *ctx, const char *dir);
+
+/**
+ * uci_revert: revert all changes to a config item
+ * @ctx: uci context
+ * @p: pointer to a uci_package struct ptr (will be replaced by the revert)
+ * @section: section name (optional)
+ * @option option name (optional)
+ */
+extern int uci_revert(struct uci_context *ctx, struct uci_package **p, const char *section, const char *option);
+
+/**
+ * uci_parse_argument: parse a shell-style argument, with an arbitrary quoting style
  * @ctx: uci context
+ * @stream: input stream
+ * @str: pointer to the current line (use NULL for parsing the next line)
+ * @result: pointer for the result
  */
-extern char **uci_list_configs();
+extern int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result);
+
+/**
+ * uci_set_backend: change the default backend
+ * @ctx: uci context
+ * @name: name of the backend
+ *
+ * The default backend is "file", which uses /etc/config for config storage
+ */
+extern int uci_set_backend(struct uci_context *ctx, const char *name);
+
+/**
+ * uci_validate_text: validate a value string for uci options
+ * @str: value
+ *
+ * this function checks whether a given string is acceptable as value
+ * for uci options
+ */
+extern bool uci_validate_text(const char *str);
 
 /* UCI data structures */
+enum uci_type {
+	UCI_TYPE_UNSPEC = 0,
+	UCI_TYPE_HISTORY = 1,
+	UCI_TYPE_PACKAGE = 2,
+	UCI_TYPE_SECTION = 3,
+	UCI_TYPE_OPTION = 4,
+	UCI_TYPE_PATH = 5,
+	UCI_TYPE_BACKEND = 6,
+	UCI_TYPE_ITEM = 7,
+};
+
+enum uci_option_type {
+	UCI_TYPE_STRING = 0,
+	UCI_TYPE_LIST = 1,
+};
+
+enum uci_flags {
+	UCI_FLAG_STRICT =        (1 << 0), /* strict mode for the parser */
+	UCI_FLAG_PERROR =        (1 << 1), /* print parser error messages */
+	UCI_FLAG_EXPORT_NAME =   (1 << 2), /* when exporting, name unnamed sections */
+	UCI_FLAG_SAVED_HISTORY = (1 << 3), /* store the saved history in memory as well */
+};
+
+struct uci_element
+{
+	struct uci_list list;
+	enum uci_type type;
+	char *name;
+};
+
+struct uci_backend
+{
+	struct uci_element e;
+	char **(*list_configs)(struct uci_context *ctx);
+	struct uci_package *(*load)(struct uci_context *ctx, const char *name);
+	void (*commit)(struct uci_context *ctx, struct uci_package **p, bool overwrite);
+
+	/* private: */
+	const void *ptr;
+	void *priv;
+};
 
 struct uci_context
 {
@@ -120,86 +378,217 @@ struct uci_context
 	/* parser context, use for error handling only */
 	struct uci_parse_context *pctx;
 
-	/* private: */
-	int errno;
-	jmp_buf trap;
-	char *buf;
-	int bufsz;
-};
+	/* backend for import and export */
+	struct uci_backend *backend;
+	struct uci_list backends;
 
-struct uci_parse_context
-{
-	/* error context */
-	const char *reason;
-	int line;
-	int byte;
+	/* uci runtime flags */
+	enum uci_flags flags;
+
+	char *confdir;
+	char *savedir;
+
+	/* search path for history files */
+	struct uci_list history_path;
 
 	/* private: */
-	struct uci_config *cfg;
-	struct uci_section *section;
-	FILE *file;
-	const char *name;
+	int err;
+	const char *func;
+	jmp_buf trap;
+	bool internal;
 	char *buf;
 	int bufsz;
 };
 
-struct uci_config
+struct uci_package
 {
-	struct uci_list list;
+	struct uci_element e;
 	struct uci_list sections;
 	struct uci_context *ctx;
-	char *name;
+	bool has_history;
+	char *path;
+
 	/* private: */
+	struct uci_backend *backend;
+	void *priv;
 	int n_section;
+	struct uci_list history;
+	struct uci_list saved_history;
 };
 
 struct uci_section
 {
-	struct uci_list list;
+	struct uci_element e;
 	struct uci_list options;
-	struct uci_config *config;
+	struct uci_package *package;
+	bool anonymous;
 	char *type;
-	char *name;
 };
 
 struct uci_option
 {
-	struct uci_list list;
+	struct uci_element e;
 	struct uci_section *section;
-	char *name;
+	enum uci_option_type type;
+	union {
+		struct uci_list list;
+		char *string;
+	} v;
+};
+
+enum uci_command {
+	UCI_CMD_ADD,
+	UCI_CMD_REMOVE,
+	UCI_CMD_CHANGE,
+	UCI_CMD_RENAME,
+	UCI_CMD_LIST_ADD,
+};
+
+struct uci_history
+{
+	struct uci_element e;
+	enum uci_command cmd;
+	char *section;
+	char *value;
+};
+
+struct uci_ptr
+{
+	enum uci_type target;
+	enum {
+		UCI_LOOKUP_DONE =     (1 << 0),
+		UCI_LOOKUP_COMPLETE = (1 << 1),
+		UCI_LOOKUP_EXTENDED = (1 << 2),
+	} flags;
+
+	struct uci_package *p;
+	struct uci_section *s;
+	struct uci_option *o;
+
+	char *package;
+	char *section;
+	char *option;
 	char *value;
 };
 
+
 /* linked list handling */
 #ifndef offsetof
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #endif
 
-/* returns true if a list is empty */
-#define uci_list_empty(list) ((list)->next == (list))
+/**
+ * container_of - cast a member of a structure out to the containing structure
+ * @ptr:    the pointer to the member.
+ * @type:   the type of the container struct this is embedded in.
+ * @member: the name of the member within the struct.
+ */
+#define container_of(ptr, type, member) \
+	((type *) ((char *)ptr - offsetof(type,member)))
+
 
 /**
  * uci_list_entry: casts an uci_list pointer to the containing struct.
  * @_type: config, section or option
  * @_ptr: pointer to the uci_list struct
  */
-#define uci_list_entry(_type, _ptr) \
-	((struct uci_ ## _type *) ((char *)(_ptr) - offsetof(struct uci_ ## _type,list)))
+#define list_to_element(ptr) \
+	container_of(ptr, struct uci_element, list)
+
+/**
+ * uci_foreach_entry: loop through a list of uci elements
+ * @_list: pointer to the uci_list struct
+ * @_ptr: iteration variable, struct uci_element
+ *
+ * use like a for loop, e.g:
+ *   uci_foreach(&list, p) {
+ *   	...
+ *   }
+ */
+#define uci_foreach_element(_list, _ptr)		\
+	for(_ptr = list_to_element((_list)->next);	\
+		&_ptr->list != (_list);			\
+		_ptr = list_to_element(_ptr->list.next))
 
 /**
- * uci_foreach_entry: loop through a list of configs, sections or options
- * @_type: see uci_list_entry
+ * uci_foreach_entry_safe: like uci_foreach_safe, but safe for deletion
  * @_list: pointer to the uci_list struct
- * @_ptr: iteration variable
+ * @_tmp: temporary variable, struct uci_element *
+ * @_ptr: iteration variable, struct uci_element *
  *
  * use like a for loop, e.g:
- *   uci_foreach(section, &list, p) {
+ *   uci_foreach(&list, p) {
  *   	...
  *   }
  */
-#define uci_foreach_entry(_type, _list, _ptr)		\
-	for(_ptr = uci_list_entry(_type, (_list)->next);	\
+#define uci_foreach_element_safe(_list, _tmp, _ptr)		\
+	for(_ptr = list_to_element((_list)->next),		\
+		_tmp = list_to_element(_ptr->list.next);	\
 		&_ptr->list != (_list);			\
-		_ptr = uci_list_entry(_type, _ptr->list.next))
+		_ptr = _tmp, _tmp = list_to_element(_ptr->list.next))
+
+/**
+ * uci_list_empty: returns true if a list is empty
+ * @list: list head
+ */
+#define uci_list_empty(list) ((list)->next == (list))
+
+/* wrappers for dynamic type handling */
+#define uci_type_backend UCI_TYPE_BACKEND
+#define uci_type_history UCI_TYPE_HISTORY
+#define uci_type_package UCI_TYPE_PACKAGE
+#define uci_type_section UCI_TYPE_SECTION
+#define uci_type_option UCI_TYPE_OPTION
+
+/* element typecasting */
+#ifdef UCI_DEBUG_TYPECAST
+static const char *uci_typestr[] = {
+	[uci_type_backend] = "backend",
+	[uci_type_history] = "history",
+	[uci_type_package] = "package",
+	[uci_type_section] = "section",
+	[uci_type_option] = "option",
+};
+
+static void uci_typecast_error(int from, int to)
+{
+	fprintf(stderr, "Invalid typecast from '%s' to '%s'\n", uci_typestr[from], uci_typestr[to]);
+}
+
+#define BUILD_CAST(_type) \
+	static inline struct uci_ ## _type *uci_to_ ## _type (struct uci_element *e) \
+	{ \
+		if (e->type != uci_type_ ## _type) { \
+			uci_typecast_error(e->type, uci_type_ ## _type); \
+		} \
+		return (struct uci_ ## _type *) e; \
+	}
+
+BUILD_CAST(backend)
+BUILD_CAST(history)
+BUILD_CAST(package)
+BUILD_CAST(section)
+BUILD_CAST(option)
+
+#else
+#define uci_to_backend(ptr) container_of(ptr, struct uci_backend, e)
+#define uci_to_history(ptr) container_of(ptr, struct uci_history, e)
+#define uci_to_package(ptr) container_of(ptr, struct uci_package, e)
+#define uci_to_section(ptr) container_of(ptr, struct uci_section, e)
+#define uci_to_option(ptr)  container_of(ptr, struct uci_option, e)
+#endif
+
+/**
+ * uci_alloc_element: allocate a generic uci_element, reserve a buffer and typecast
+ * @ctx: uci context
+ * @type: {package,section,option}
+ * @name: string containing the name of the element
+ * @datasize: additional buffer size to reserve at the end of the struct
+ */
+#define uci_alloc_element(ctx, type, name, datasize) \
+	uci_to_ ## type (uci_alloc_generic(ctx, uci_type_ ## type, name, sizeof(struct uci_ ## type) + datasize))
+
+#define uci_dataptr(ptr) \
+	(((char *) ptr) + sizeof(*ptr))
 
 #endif