examples/blobmsg-example.c

   1 #include <stdio.h>
   2
   3 #include "blobmsg.h"
   4 #include "blobmsg_json.h"
   5
   6 static const char *indent_str = "\t\t\t\t\t\t\t\t\t\t\t\t\t";
   7
   8 #define indent_printf(indent, ...) do { \
   9         if (indent > 0) \
  10                 fwrite(indent_str, indent, 1, stderr); \
  11         fprintf(stderr, __VA_ARGS__); \
  12 } while(0)
  13
  14 static void dump_attr_data(struct blob_attr *data, int indent, int next_indent);
  15
  16 static void
  17 dump_table(struct blob_attr *head, int len, int indent, bool array)
  18 {
  19         struct blob_attr *attr;
  20         struct blobmsg_hdr *hdr;
  21
  22         indent_printf(indent, "{\n");
  23         __blob_for_each_attr(attr, head, len) {
  24                 hdr = blob_data(attr);
  25                 if (!array)
  26                         indent_printf(indent + 1, "%s : ", hdr->name);
  27                 dump_attr_data(attr, 0, indent + 1);
  28         }
  29         indent_printf(indent, "}\n");
  30 }
  31
  32 static void dump_attr_data(struct blob_attr *data, int indent, int next_indent)
  33 {
  34         int type = blobmsg_type(data);
  35         switch(type) {
  36         case BLOBMSG_TYPE_STRING:
  37                 indent_printf(indent, "%s\n", (char *) blobmsg_data(data));
  38                 break;
  39         case BLOBMSG_TYPE_INT8:
  40                 indent_printf(indent, "%d\n", blobmsg_get_u8(data));
  41                 break;
  42         case BLOBMSG_TYPE_INT16:
  43                 indent_printf(indent, "%d\n", blobmsg_get_u16(data));
  44                 break;
  45         case BLOBMSG_TYPE_INT32:
  46                 indent_printf(indent, "%d\n", blobmsg_get_u32(data));
  47                 break;
  48         case BLOBMSG_TYPE_INT64:
  49                 indent_printf(indent, "%"PRIu64"\n", blobmsg_get_u64(data));
  50                 break;
  51         case BLOBMSG_TYPE_TABLE:
  52         case BLOBMSG_TYPE_ARRAY:
  53                 if (!indent)
  54                         indent_printf(indent, "\n");
  55                 dump_table(blobmsg_data(data), blobmsg_data_len(data),
  56                            next_indent, type == BLOBMSG_TYPE_ARRAY);
  57                 break;
  58         }
  59 }
  60
  61 enum {
  62         FOO_MESSAGE,
  63         FOO_LIST,
  64         FOO_TESTDATA
  65 };
  66
  67 static const struct blobmsg_policy pol[] = {
  68         [FOO_MESSAGE] = {
  69                 .name = "message",
  70                 .type = BLOBMSG_TYPE_STRING,
  71         },
  72         [FOO_LIST] = {
  73                 .name = "list",
  74                 .type = BLOBMSG_TYPE_ARRAY,
  75         },
  76         [FOO_TESTDATA] = {
  77                 .name = "testdata",
  78                 .type = BLOBMSG_TYPE_TABLE,
  79         },
  80 };
  81
  82 #ifndef ARRAY_SIZE
  83 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  84 #endif
  85
  86 static void dump_message(struct blob_buf *buf)
  87 {
  88         struct blob_attr *tb[ARRAY_SIZE(pol)];
  89
  90         if (blobmsg_parse(pol, ARRAY_SIZE(pol), tb, blob_data(buf->head), blob_len(buf->head)) != 0) {
  91                 fprintf(stderr, "Parse failed\n");
  92                 return;
  93         }
  94         if (tb[FOO_MESSAGE])
  95                 fprintf(stderr, "Message: %s\n", (char *) blobmsg_data(tb[FOO_MESSAGE]));
  96
  97         if (tb[FOO_LIST]) {
  98                 fprintf(stderr, "List: ");
  99                 dump_table(blobmsg_data(tb[FOO_LIST]), blobmsg_data_len(tb[FOO_LIST]), 0, true);
 100         }
 101         if (tb[FOO_TESTDATA]) {
 102                 fprintf(stderr, "Testdata: ");
 103                 dump_table(blobmsg_data(tb[FOO_TESTDATA]), blobmsg_data_len(tb[FOO_TESTDATA]), 0, false);
 104         }
 105 }
 106
 107 static void
 108 fill_message(struct blob_buf *buf)
 109 {
 110         void *tbl;
 111
 112         blobmsg_add_string(buf, "message", "Hello, world!");
 113
 114         tbl = blobmsg_open_table(buf, "testdata");
 115         blobmsg_add_u32(buf, "hello", 1);
 116         blobmsg_add_string(buf, "world", "2");
 117         blobmsg_close_table(buf, tbl);
 118
 119         tbl = blobmsg_open_array(buf, "list");
 120         blobmsg_add_u32(buf, NULL, 0);
 121         blobmsg_add_u32(buf, NULL, 1);
 122         blobmsg_add_u32(buf, NULL, 2);
 123         blobmsg_close_table(buf, tbl);
 124 }
 125
 126 int main(int argc, char **argv)
 127 {
 128         static struct blob_buf buf;
 129
 130         blobmsg_buf_init(&buf);
 131         fill_message(&buf);
 132         dump_message(&buf);
 133         fprintf(stderr, "json: %s\n", blobmsg_format_json(buf.head, true));
 134
 135         if (buf.buf)
 136                 free(buf.buf);
 137
 138         return 0;
 139 }