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(void *data, int len, int type, 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, *last_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(blobmsg_data(attr), blobmsg_data_len(attr), blob_id(attr), 0, indent + 1);
  28                 last_attr = attr;
  29         }
  30         indent_printf(indent, "}\n");
  31 }
  32
  33 static void dump_attr_data(void *data, int len, int type, int indent, int next_indent)
  34 {
  35         switch(type) {
  36         case BLOBMSG_TYPE_STRING:
  37                 indent_printf(indent, "%s\n", (char *) data);
  38                 break;
  39         case BLOBMSG_TYPE_INT8:
  40                 indent_printf(indent, "%d\n", *(uint8_t *)data);
  41                 break;
  42         case BLOBMSG_TYPE_INT16:
  43                 indent_printf(indent, "%d\n", *(uint16_t *)data);
  44                 break;
  45         case BLOBMSG_TYPE_INT32:
  46                 indent_printf(indent, "%d\n", *(uint32_t *)data);
  47                 break;
  48         case BLOBMSG_TYPE_INT64:
  49                 indent_printf(indent, "%lld\n", *(uint64_t *)data);
  50                 break;
  51         case BLOBMSG_TYPE_TABLE:
  52         case BLOBMSG_TYPE_ARRAY:
  53                 if (!indent)
  54                         indent_printf(indent, "\n");
  55                 dump_table(data, len, next_indent, type == BLOBMSG_TYPE_ARRAY);
  56                 break;
  57         }
  58 }
  59
  60 enum {
  61         FOO_MESSAGE,
  62         FOO_LIST,
  63         FOO_TESTDATA
  64 };
  65
  66 static const struct blobmsg_policy pol[] = {
  67         [FOO_MESSAGE] = {
  68                 .name = "message",
  69                 .type = BLOBMSG_TYPE_STRING,
  70         },
  71         [FOO_LIST] = {
  72                 .name = "list",
  73                 .type = BLOBMSG_TYPE_ARRAY,
  74         },
  75         [FOO_TESTDATA] = {
  76                 .name = "testdata",
  77                 .type = BLOBMSG_TYPE_TABLE,
  78         },
  79 };
  80
  81 #ifndef ARRAY_SIZE
  82 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  83 #endif
  84
  85 static void dump_message(struct blob_buf *buf)
  86 {
  87         struct blob_attr *tb[ARRAY_SIZE(pol)];
  88
  89         if (blobmsg_parse(pol, ARRAY_SIZE(pol), tb, blob_data(buf->head), blob_len(buf->head)) != 0) {
  90                 fprintf(stderr, "Parse failed\n");
  91                 return;
  92         }
  93         if (tb[FOO_MESSAGE])
  94                 fprintf(stderr, "Message: %s\n", (char *) blobmsg_data(tb[FOO_MESSAGE]));
  95
  96         if (tb[FOO_LIST]) {
  97                 fprintf(stderr, "List: ");
  98                 dump_table(blobmsg_data(tb[FOO_LIST]), blobmsg_data_len(tb[FOO_LIST]), 0, true);
  99         }
 100         if (tb[FOO_TESTDATA]) {
 101                 fprintf(stderr, "Testdata: ");
 102                 dump_table(blobmsg_data(tb[FOO_TESTDATA]), blobmsg_data_len(tb[FOO_TESTDATA]), 0, false);
 103         }
 104 }
 105
 106 static void
 107 fill_message(struct blob_buf *buf)
 108 {
 109         void *tbl;
 110
 111         blobmsg_add_string(buf, "message", "Hello, world!");
 112
 113         tbl = blobmsg_open_table(buf, "testdata");
 114         blobmsg_add_u32(buf, "hello", 1);
 115         blobmsg_add_string(buf, "world", "2");
 116         blobmsg_close_table(buf, tbl);
 117
 118         tbl = blobmsg_open_array(buf, "list");
 119         blobmsg_add_u32(buf, NULL, 0);
 120         blobmsg_add_u32(buf, NULL, 1);
 121         blobmsg_add_u32(buf, NULL, 2);
 122         blobmsg_close_table(buf, tbl);
 123 }
 124
 125 int main(int argc, char **argv)
 126 {
 127         static struct blob_buf buf;
 128
 129         blobmsg_buf_init(&buf);
 130         fill_message(&buf);
 131         dump_message(&buf);
 132         fprintf(stderr, "json: %s\n", blobmsg_format_json(buf.head, false));
 133
 134         if (buf.buf)
 135                 free(buf.buf);
 136
 137         return 0;
 138 }