examples/blobmsg-example.c

   1 #include <stdio.h>
   2
   3 #include "blobmsg.h"
   4
   5 static const char *indent_str = "\t\t\t\t\t\t\t\t\t\t\t\t\t";
   6
   7 #define indent_printf(indent, ...) do { \
   8         if (indent > 0) \
   9                 fwrite(indent_str, indent, 1, stderr); \
  10         fprintf(stderr, __VA_ARGS__); \
  11 } while(0)
  12
  13 static void dump_attr_data(void *data, int len, int type, int indent, int next_indent);
  14
  15 static void
  16 dump_array(struct blob_attr *head, int len, int indent)
  17 {
  18         struct blob_attr *attr;
  19
  20         indent_printf(indent, "{\n");
  21         __blob_for_each_attr(attr, head, len) {
  22                 dump_attr_data(blob_data(attr), blob_len(attr), blob_id(attr), indent + 1, indent + 1);
  23         }
  24         indent_printf(indent, "}\n");
  25 }
  26
  27 static void
  28 dump_table(struct blob_attr *head, int len, int indent)
  29 {
  30         struct blob_attr *attr, *last_attr;
  31         struct blobmsg_hdr *hdr;
  32
  33         indent_printf(indent, "{\n");
  34         __blob_for_each_attr(attr, head, len) {
  35                 hdr = blob_data(attr);
  36                 indent_printf(indent + 1, "%s : ", hdr->name);
  37                 dump_attr_data(blobmsg_data(attr), blobmsg_data_len(attr), blob_id(attr), 0, indent + 1);
  38                 last_attr = attr;
  39         }
  40         indent_printf(indent, "}\n");
  41 }
  42
  43 static void dump_attr_data(void *data, int len, int type, int indent, int next_indent)
  44 {
  45         switch(type) {
  46         case BLOBMSG_TYPE_STRING:
  47                 indent_printf(indent, "%s\n", (char *) data);
  48                 break;
  49         case BLOBMSG_TYPE_INT8:
  50                 indent_printf(indent, "%d\n", *(uint8_t *)data);
  51                 break;
  52         case BLOBMSG_TYPE_INT16:
  53                 indent_printf(indent, "%d\n", *(uint16_t *)data);
  54                 break;
  55         case BLOBMSG_TYPE_INT32:
  56                 indent_printf(indent, "%d\n", *(uint32_t *)data);
  57                 break;
  58         case BLOBMSG_TYPE_INT64:
  59                 indent_printf(indent, "%lld\n", *(uint64_t *)data);
  60                 break;
  61         case BLOBMSG_TYPE_TABLE:
  62                 if (!indent)
  63                         indent_printf(indent, "\n");
  64                 dump_table(data, len, next_indent);
  65                 break;
  66         case BLOBMSG_TYPE_ARRAY:
  67                 if (!indent)
  68                         indent_printf(indent, "\n");
  69                 dump_array(data, len, next_indent);
  70                 break;
  71         }
  72 }
  73
  74 enum {
  75         FOO_MESSAGE,
  76         FOO_LIST,
  77         FOO_TESTDATA
  78 };
  79
  80 static const struct blobmsg_policy pol[] = {
  81         [FOO_MESSAGE] = {
  82                 .name = "message",
  83                 .type = BLOBMSG_TYPE_STRING,
  84         },
  85         [FOO_LIST] = {
  86                 .name = "list",
  87                 .type = BLOBMSG_TYPE_ARRAY,
  88         },
  89         [FOO_TESTDATA] = {
  90                 .name = "testdata",
  91                 .type = BLOBMSG_TYPE_TABLE,
  92         },
  93 };
  94
  95 #ifndef ARRAY_SIZE
  96 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  97 #endif
  98
  99 static void dump_message(struct blob_buf *buf)
 100 {
 101         struct blob_attr *tb[ARRAY_SIZE(pol)];
 102
 103         if (blobmsg_parse(pol, ARRAY_SIZE(pol), tb, blob_data(buf->head), blob_len(buf->head)) != 0) {
 104                 fprintf(stderr, "Parse failed\n");
 105                 return;
 106         }
 107         if (tb[FOO_MESSAGE])
 108                 fprintf(stderr, "Message: %s\n", (char *) blobmsg_data(tb[FOO_MESSAGE]));
 109
 110         if (tb[FOO_LIST]) {
 111                 fprintf(stderr, "List: ");
 112                 dump_array(blobmsg_data(tb[FOO_LIST]), blob_len(tb[FOO_LIST]), 0);
 113         }
 114         if (tb[FOO_TESTDATA]) {
 115                 fprintf(stderr, "Testdata: ");
 116                 dump_table(blobmsg_data(tb[FOO_TESTDATA]), blob_len(tb[FOO_TESTDATA]), 0);
 117         }
 118 }
 119
 120 static void
 121 fill_message(struct blob_buf *buf)
 122 {
 123         void *tbl;
 124
 125         blobmsg_add_string(buf, "message", "Hello, world!");
 126
 127         tbl = blobmsg_open_array(buf, "list");
 128         blobmsg_add_u32(buf, NULL, 0);
 129         blobmsg_add_u32(buf, NULL, 1);
 130         blobmsg_add_u32(buf, NULL, 2);
 131         blobmsg_close_table(buf, tbl);
 132
 133         tbl = blobmsg_open_table(buf, "testdata");
 134         blobmsg_add_u32(buf, "hello", 1);
 135         blobmsg_add_string(buf, "world", "2");
 136         blobmsg_close_table(buf, tbl);
 137 }
 138
 139 int main(int argc, char **argv)
 140 {
 141         static struct blob_buf buf;
 142
 143         blobmsg_buf_init(&buf);
 144         fill_message(&buf);
 145         dump_message(&buf);
 146
 147         if (buf.buf)
 148                 free(buf.buf);
 149
 150         return 0;
 151 }