jshn: properly support JSON "null" type
[project/libubox.git] / utils.h
1 /*
2 * utils - misc libubox utility functions
3 *
4 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #ifndef __LIBUBOX_UTILS_H
20 #define __LIBUBOX_UTILS_H
21
22 #include <sys/types.h>
23 #include <sys/time.h>
24 #include <stdint.h>
25 #include <stdbool.h>
26 #include <unistd.h>
27 #include <time.h>
28
29 /*
30 * calloc_a(size_t len, [void **addr, size_t len,...], NULL)
31 *
32 * allocate a block of memory big enough to hold multiple aligned objects.
33 * the pointer to the full object (starting with the first chunk) is returned,
34 * all other pointers are stored in the locations behind extra addr arguments.
35 * the last argument needs to be a NULL pointer
36 */
37
38 #define calloc_a(len, ...) __calloc_a(len, ##__VA_ARGS__, NULL)
39
40 void *__calloc_a(size_t len, ...);
41
42 #ifndef ARRAY_SIZE
43 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
44 #endif
45
46 #define __BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
47
48 #ifdef __OPTIMIZE__
49 extern int __BUILD_BUG_ON_CONDITION_FAILED;
50 #define BUILD_BUG_ON(condition) \
51 do { \
52 __BUILD_BUG_ON(condition); \
53 if (condition) \
54 __BUILD_BUG_ON_CONDITION_FAILED = 1; \
55 } while(0)
56 #else
57 #define BUILD_BUG_ON __BUILD_BUG_ON
58 #endif
59
60 #if defined(__APPLE__) && !defined(CLOCK_MONOTONIC)
61 #define LIBUBOX_COMPAT_CLOCK_GETTIME
62
63 #include <mach/clock_types.h>
64 #define CLOCK_REALTIME CALENDAR_CLOCK
65 #define CLOCK_MONOTONIC SYSTEM_CLOCK
66
67 int clock_gettime(int type, struct timespec *tv);
68
69 #endif
70
71 #ifdef __GNUC__
72 #define _GNUC_MIN_VER(maj, min) (((__GNUC__ << 8) + __GNUC_MINOR__) >= (((maj) << 8) + (min)))
73 #else
74 #define _GNUC_MIN_VER(maj, min) 0
75 #endif
76
77 #if defined(__linux__) || defined(__CYGWIN__)
78 #include <byteswap.h>
79 #include <endian.h>
80
81 #elif defined(__APPLE__)
82 #include <machine/endian.h>
83 #include <machine/byte_order.h>
84 #define bswap_32(x) OSSwapInt32(x)
85 #define bswap_64(x) OSSwapInt64(x)
86 #elif defined(__FreeBSD__)
87 #include <sys/endian.h>
88 #define bswap_32(x) bswap32(x)
89 #define bswap_64(x) bswap64(x)
90 #else
91 #include <machine/endian.h>
92 #define bswap_32(x) swap32(x)
93 #define bswap_64(x) swap64(x)
94 #endif
95
96 #ifndef __BYTE_ORDER
97 #define __BYTE_ORDER BYTE_ORDER
98 #endif
99 #ifndef __BIG_ENDIAN
100 #define __BIG_ENDIAN BIG_ENDIAN
101 #endif
102 #ifndef __LITTLE_ENDIAN
103 #define __LITTLE_ENDIAN LITTLE_ENDIAN
104 #endif
105
106 static inline uint16_t __u_bswap16(uint16_t val)
107 {
108 return ((val >> 8) & 0xffu) | ((val & 0xffu) << 8);
109 }
110
111 #if _GNUC_MIN_VER(4, 2)
112 #define __u_bswap32(x) __builtin_bswap32(x)
113 #define __u_bswap64(x) __builtin_bswap64(x)
114 #else
115 #define __u_bswap32(x) bswap_32(x)
116 #define __u_bswap64(x) bswap_64(x)
117 #endif
118
119 #if __BYTE_ORDER == __LITTLE_ENDIAN
120
121 #define cpu_to_be64(x) __u_bswap64(x)
122 #define cpu_to_be32(x) __u_bswap32(x)
123 #define cpu_to_be16(x) __u_bswap16((uint16_t) (x))
124
125 #define be64_to_cpu(x) __u_bswap64(x)
126 #define be32_to_cpu(x) __u_bswap32(x)
127 #define be16_to_cpu(x) __u_bswap16((uint16_t) (x))
128
129 #define cpu_to_le64(x) (x)
130 #define cpu_to_le32(x) (x)
131 #define cpu_to_le16(x) (x)
132
133 #define le64_to_cpu(x) (x)
134 #define le32_to_cpu(x) (x)
135 #define le16_to_cpu(x) (x)
136
137 #else /* __BYTE_ORDER == __LITTLE_ENDIAN */
138
139 #define cpu_to_le64(x) __u_bswap64(x)
140 #define cpu_to_le32(x) __u_bswap32(x)
141 #define cpu_to_le16(x) __u_bswap16((uint16_t) (x))
142
143 #define le64_to_cpu(x) __u_bswap64(x)
144 #define le32_to_cpu(x) __u_bswap32(x)
145 #define le16_to_cpu(x) __u_bswap16((uint16_t) (x))
146
147 #define cpu_to_be64(x) (x)
148 #define cpu_to_be32(x) (x)
149 #define cpu_to_be16(x) (x)
150
151 #define be64_to_cpu(x) (x)
152 #define be32_to_cpu(x) (x)
153 #define be16_to_cpu(x) (x)
154
155 #endif
156
157 #ifndef __packed
158 #define __packed __attribute__((packed))
159 #endif
160
161 #ifndef __constructor
162 #define __constructor __attribute__((constructor))
163 #endif
164
165 #ifndef __destructor
166 #define __destructor __attribute__((destructor))
167 #endif
168
169 #ifndef __hidden
170 #define __hidden __attribute__((visibility("hidden")))
171 #endif
172
173 int b64_encode(const void *src, size_t src_len,
174 void *dest, size_t dest_len);
175
176 int b64_decode(const void *src, void *dest, size_t dest_len);
177
178 #define B64_ENCODE_LEN(_len) ((((_len) + 2) / 3) * 4 + 1)
179 #define B64_DECODE_LEN(_len) (((_len) / 4) * 3 + 1)
180
181 static inline unsigned int cbuf_order(unsigned int x)
182 {
183 return 32 - __builtin_clz(x - 1);
184 }
185
186 static inline unsigned long cbuf_size(int order)
187 {
188 unsigned long page_size = sysconf(_SC_PAGESIZE);
189 unsigned long ret = 1ULL << order;
190
191 if (ret < page_size)
192 ret = page_size;
193
194 return ret;
195 }
196
197 void *cbuf_alloc(unsigned int order);
198 void cbuf_free(void *ptr, unsigned int order);
199
200 #endif