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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 General Public License for more details.
- */
- #ifndef __UCI_INTERNAL_H
- #define __UCI_INTERNAL_H
- struct uci_parse_context
- {
- /* error context */
- const char *reason;
- int line;
- int byte;
- /* private: */
- struct uci_package *package;
- struct uci_section *section;
- bool merge;
- FILE *file;
- const char *name;
- char *buf;
- int bufsz;
- };
- int uci_add_backend(struct uci_context *ctx, struct uci_backend *b);
- void uci_add_history(struct uci_context *ctx, struct uci_list *list, int cmd, char *section, char *option, char *value);
- void uci_free_history(struct uci_history *h);
- /*
- * 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; \
- ctx->errno = 0; \
- if (!ctx) \
- return UCI_ERR_INVAL; \
- if (!ctx->internal) \
- __val = setjmp(ctx->trap); \
- ctx->internal = false; \
- if (__val) { \
- DPRINTF("LEAVE: %s, ret=%d\n", __func__, __val); \
- ctx->errno = __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->errno = __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)
- /*
- * 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
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