remove some crap
[project/uci.git] / err.h
1 /*
2 * libuci - Library for the Unified Configuration Interface
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 /*
16 * functions for debug and error handling, for internal use only
17 */
18
19 #ifdef DEBUG
20 #define DPRINTF(...) fprintf(stderr, __VA_ARGS__)
21 #else
22 #define DPRINTF(...)
23 #endif
24
25 /*
26 * throw an uci exception and store the error number
27 * in the context.
28 */
29 #define UCI_THROW(ctx, err) do { \
30 longjmp(ctx->trap, err); \
31 } while (0)
32
33 /*
34 * store the return address for handling exceptions
35 * needs to be called in every externally visible library function
36 *
37 * NB: this does not handle recursion at all. Calling externally visible
38 * functions from other uci functions is only allowed at the end of the
39 * calling function.
40 */
41 #define UCI_HANDLE_ERR(ctx) do { \
42 int __val; \
43 if (!ctx) \
44 return UCI_ERR_INVAL; \
45 __val = setjmp(ctx->trap); \
46 if (__val) { \
47 ctx->errno = __val; \
48 return __val; \
49 } \
50 } while (0)
51
52 /*
53 * In a block enclosed by UCI_TRAP_SAVE and UCI_TRAP_RESTORE, all exceptions
54 * are intercepted and redirected to the label specified in 'handler'
55 * after UCI_TRAP_RESTORE, or when reaching the 'handler' label, the old
56 * exception handler is restored
57 */
58 #define UCI_TRAP_SAVE(ctx, handler) do { \
59 jmp_buf __old_trap; \
60 int __val; \
61 memcpy(__old_trap, ctx->trap, sizeof(ctx->trap)); \
62 __val = setjmp(ctx->trap); \
63 if (__val) { \
64 ctx->errno = __val; \
65 memcpy(ctx->trap, __old_trap, sizeof(ctx->trap)); \
66 goto handler; \
67 }
68 #define UCI_TRAP_RESTORE(ctx) \
69 memcpy(ctx->trap, __old_trap, sizeof(ctx->trap)); \
70 } while(0)
71
72 /*
73 * check the specified condition.
74 * throw an invalid argument exception if it's false
75 */
76 #define UCI_ASSERT(ctx, expr) do { \
77 if (!(expr)) { \
78 DPRINTF("[%s:%d] Assertion failed\n", __FILE__, __LINE__); \
79 UCI_THROW(ctx, UCI_ERR_INVAL); \
80 } \
81 } while (0)
82