Mirror of the official OpenWrt uci repository https://git.openwrt.org/project/uci
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/*
* 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 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 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 */
const char *reason;
int line;
size_t byte;
/* private: */
struct uci_package *package;
struct uci_section *section;
bool merge;
FILE *file;
const char *name;
char *buf;
size_t bufsz;
size_t buf_filled;
size_t pos;
};
#define pctx_pos(pctx) ((pctx)->pos)
#define pctx_str(pctx, i) (&(pctx)->buf[(i)])
#define pctx_cur_str(pctx) pctx_str(pctx, pctx_pos(pctx))
#define pctx_char(pctx, i) ((pctx)->buf[(i)])
#define pctx_cur_char(pctx) pctx_char(pctx, pctx_pos(pctx))
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, bool package);
__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, const char *origfilename, int pos, bool write, bool create);
__private void uci_close_stream(FILE *stream);
__private void uci_getln(struct uci_context *ctx, size_t offset);
__private void uci_parse_error(struct uci_context *ctx, 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_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, true);
}
static inline bool uci_validate_type(const char *str)
{
return uci_validate_str(str, false, false);
}
static inline bool uci_validate_name(const char *str)
{
return uci_validate_str(str, true, false);
}
/* 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; \
} while(0)
#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