2 * blobmsg - library for generating/parsing structured blob messages
4 * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License version 2.1
8 * as published by the Free Software Foundation
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
21 #define BLOBMSG_ALIGN 2
22 #define BLOBMSG_PADDING(len) (((len) + (1 << BLOBMSG_ALIGN) - 1) & ~((1 << BLOBMSG_ALIGN) - 1))
34 BLOBMSG_TYPE_LAST = __BLOBMSG_TYPE_LAST - 1
42 struct blobmsg_policy {
44 enum blobmsg_type type;
47 static inline int blobmsg_hdrlen(int namelen)
49 return BLOBMSG_PADDING(sizeof(struct blobmsg_hdr) + namelen + 1);
52 static inline char *blobmsg_name(struct blob_attr *attr)
54 struct blobmsg_hdr *hdr = blob_data(attr);
55 return (char *) hdr->name;
58 static inline void *blobmsg_data(struct blob_attr *attr)
60 struct blobmsg_hdr *hdr = blob_data(attr);
61 return (char *) hdr + blobmsg_hdrlen(hdr->namelen);
64 static inline int blobmsg_data_len(struct blob_attr *attr)
68 start = blob_data(attr);
69 end = blobmsg_data(attr);
71 return blob_len(attr) - (end - start);
74 bool blobmsg_check_attr(const struct blob_attr *attr, bool name);
75 int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
76 struct blob_attr **tb, void *data, int len);
78 int blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
79 const void *data, int len);
82 blobmsg_add_u8(struct blob_buf *buf, const char *name, uint8_t val)
84 return blobmsg_add_field(buf, BLOBMSG_TYPE_INT8, name, &val, 1);
88 blobmsg_add_u16(struct blob_buf *buf, const char *name, uint16_t val)
90 return blobmsg_add_field(buf, BLOBMSG_TYPE_INT16, name, &val, 2);
94 blobmsg_add_u32(struct blob_buf *buf, const char *name, uint32_t val)
96 return blobmsg_add_field(buf, BLOBMSG_TYPE_INT32, name, &val, 4);
100 blobmsg_add_u64(struct blob_buf *buf, const char *name, uint64_t val)
102 return blobmsg_add_field(buf, BLOBMSG_TYPE_INT64, name, &val, 8);
106 blobmsg_add_string(struct blob_buf *buf, const char *name, const char *string)
108 return blobmsg_add_field(buf, BLOBMSG_TYPE_STRING, name, string, strlen(string) + 1);
111 void *blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array);
114 blobmsg_open_array(struct blob_buf *buf, const char *name)
116 return blobmsg_open_nested(buf, name, true);
120 blobmsg_open_table(struct blob_buf *buf, const char *name)
122 return blobmsg_open_nested(buf, name, false);
126 blobmsg_close_array(struct blob_buf *buf, void *cookie)
128 blob_nest_end(buf, cookie);
132 blobmsg_close_table(struct blob_buf *buf, void *cookie)
134 blob_nest_end(buf, cookie);
137 static inline int blobmsg_buf_init(struct blob_buf *buf)
139 return blob_buf_init(buf, BLOBMSG_TYPE_TABLE);
142 char *blobmsg_format_json(struct blob_attr *attr, bool list);
144 #define blobmsg_for_each_attr(pos, attr, rem) \
145 for (rem = blobmsg_data_len(attr), pos = blobmsg_data(attr); \
146 (blob_pad_len(pos) <= rem) && \
147 (blob_pad_len(pos) >= sizeof(struct blob_attr)); \
148 rem -= blob_pad_len(pos), pos = blob_next(pos))