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