clean up arg checks
[project/uci.git] / libuci.c
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 * This file contains some common code for the uci library
17 */
18
19 #include <sys/types.h>
20 #include <stdbool.h>
21 #include <string.h>
22 #include <stdlib.h>
23 #include <stdio.h>
24
25 #include "libuci.h"
26
27 #define DEBUG
28
29 #ifdef DEBUG
30 #define DPRINTF(...) fprintf(stderr, __VA_ARGS__)
31 #else
32 #define DPRINTF(...)
33 #endif
34 /*
35 * throw an uci exception and store the error number
36 * in the context.
37 */
38 #define UCI_THROW(ctx, err) do { \
39 longjmp(ctx->trap, err); \
40 } while (0)
41
42 /*
43 * store the return address for handling exceptions
44 * needs to be called in every externally visible library function
45 *
46 * NB: this does not handle recursion at all. Calling externally visible
47 * functions from other uci functions is only allowed at the end of the
48 * calling function.
49 */
50 #define UCI_HANDLE_ERR(ctx) do { \
51 int __val; \
52 if (!ctx) \
53 return UCI_ERR_INVAL; \
54 __val = setjmp(ctx->trap); \
55 if (__val) { \
56 ctx->errno = __val; \
57 return __val; \
58 } \
59 } while (0)
60
61 /*
62 * check the specified condition.
63 * throw an invalid argument exception if it's false
64 */
65 #define UCI_ASSERT(ctx, expr) do { \
66 if (!(expr)) { \
67 DPRINTF("[%s:%d] Assertion failed\n", __FILE__, __LINE__); \
68 UCI_THROW(ctx, UCI_ERR_INVAL); \
69 } \
70 } while (0)
71
72
73 static char *uci_errstr[] = {
74 [UCI_OK] = "Success",
75 [UCI_ERR_MEM] = "Out of memory",
76 [UCI_ERR_INVAL] = "Invalid argument",
77 [UCI_ERR_NOTFOUND] = "Entry not found",
78 [UCI_ERR_PARSE] = "Parse error",
79 [UCI_ERR_UNKNOWN] = "Unknown error",
80 };
81
82
83 /*
84 * UCI wrapper for malloc, which uses exception handling
85 */
86 static void *uci_malloc(struct uci_context *ctx, size_t size)
87 {
88 void *ptr;
89
90 ptr = malloc(size);
91 if (!ptr)
92 UCI_THROW(ctx, UCI_ERR_MEM);
93 memset(ptr, 0, size);
94
95 return ptr;
96 }
97
98 /*
99 * UCI wrapper for realloc, which uses exception handling
100 */
101 static void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
102 {
103 ptr = realloc(ptr, size);
104 if (!ptr)
105 UCI_THROW(ctx, UCI_ERR_MEM);
106
107 return ptr;
108 }
109
110 #include "hash.c"
111 #include "parse.c"
112
113 /* externally visible functions */
114
115 struct uci_context *uci_alloc(void)
116 {
117 struct uci_context *ctx;
118
119 ctx = (struct uci_context *) malloc(sizeof(struct uci_context));
120 memset(ctx, 0, sizeof(struct uci_context));
121
122 return ctx;
123 }
124
125 int uci_cleanup(struct uci_context *ctx)
126 {
127 UCI_HANDLE_ERR(ctx);
128 uci_parse_cleanup(ctx);
129 return 0;
130 }
131
132 void uci_perror(struct uci_context *ctx, const char *str)
133 {
134 int err;
135
136 if (!ctx)
137 err = UCI_ERR_INVAL;
138 else
139 err = ctx->errno;
140
141 if ((err < 0) || (err >= UCI_ERR_LAST))
142 err = UCI_ERR_UNKNOWN;
143
144 switch (err) {
145 case UCI_ERR_PARSE:
146 if (ctx->pctx) {
147 fprintf(stderr, "%s: %s at line %d, byte %d\n", str, uci_errstr[err], ctx->pctx->line, ctx->pctx->byte);
148 break;
149 }
150 /* fall through */
151 default:
152 fprintf(stderr, "%s: %s\n", str, uci_errstr[err]);
153 break;
154 }
155 }
156
157