test-blobmsg.c

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#include <stdio.h>
#include <float.h>
#include <limits.h>
#include <stdint.h>
#include <inttypes.h>
 
#include "blobmsg.h"
#include "blobmsg_json.h"
 
static const char *indent_str = "\t\t\t\t\t\t\t\t\t\t\t\t\t";
 
#define indent_printf(indent, ...) do { \
        if (indent > 0) \
                fwrite(indent_str, indent, 1, stderr); \
        fprintf(stderr, __VA_ARGS__); \
} while(0)
 
static void dump_attr_data(struct blob_attr *data, int indent, int next_indent);
 
static void
dump_table(struct blob_attr *head, size_t len, int indent, bool array)
{
        struct blob_attr *attr;
        struct blobmsg_hdr *hdr;
 
        indent_printf(indent, "{\n");
        __blob_for_each_attr(attr, head, len) {
                hdr = blob_data(attr);
                if (!array)
                        indent_printf(indent + 1, "%s : ", hdr->name);
                dump_attr_data(attr, 0, indent + 1);
        }
        indent_printf(indent, "}\n");
}
 
static void dump_attr_data(struct blob_attr *data, int indent, int next_indent)
{
        int type = blobmsg_type(data);
        switch(type) {
        case BLOBMSG_TYPE_STRING:
                indent_printf(indent, "%s (str)\n", blobmsg_get_string(data));
                break;
        case BLOBMSG_TYPE_INT8:
                indent_printf(indent, "%d (i8)\n", (int8_t) blobmsg_get_u8(data));
                break;
        case BLOBMSG_TYPE_INT16:
                indent_printf(indent, "%d (i16)\n", (int16_t) blobmsg_get_u16(data));
                break;
        case BLOBMSG_TYPE_INT32:
                indent_printf(indent, "%d (i32)\n", (int32_t) blobmsg_get_u32(data));
                break;
        case BLOBMSG_TYPE_INT64:
                indent_printf(indent, "%"PRId64" (i64)\n", (int64_t) blobmsg_get_u64(data));
                break;
        case BLOBMSG_TYPE_DOUBLE:
                indent_printf(indent, "%lf (dbl)\n", blobmsg_get_double(data));
                break;
        case BLOBMSG_TYPE_TABLE:
        case BLOBMSG_TYPE_ARRAY:
                if (!indent)
                        indent_printf(indent, "\n");
                dump_table(blobmsg_data(data), blobmsg_data_len(data),
                           next_indent, type == BLOBMSG_TYPE_ARRAY);
                break;
        }
}
 
enum {
        FOO_MESSAGE,
        FOO_LIST,
        FOO_TESTDATA
};
 
static const struct blobmsg_policy pol[] = {
        [FOO_MESSAGE] = {
                .name = "message",
                .type = BLOBMSG_TYPE_STRING,
        },
        [FOO_LIST] = {
                .name = "list",
                .type = BLOBMSG_TYPE_ARRAY,
        },
        [FOO_TESTDATA] = {
                .name = "testdata",
                .type = BLOBMSG_TYPE_TABLE,
        },
};
 
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
 
static void dump_message(struct blob_buf *buf)
{
        struct blob_attr *tb[ARRAY_SIZE(pol)];
 
        if (blobmsg_parse(pol, ARRAY_SIZE(pol), tb, blob_data(buf->head), blob_len(buf->head)) != 0) {
                fprintf(stderr, "Parse failed\n");
                return;
        }
        if (tb[FOO_MESSAGE])
                fprintf(stderr, "Message: %s\n", (char *) blobmsg_data(tb[FOO_MESSAGE]));
 
        if (tb[FOO_LIST]) {
                fprintf(stderr, "List: ");
                dump_table(blobmsg_data(tb[FOO_LIST]), blobmsg_data_len(tb[FOO_LIST]), 0, true);
        }
        if (tb[FOO_TESTDATA]) {
                fprintf(stderr, "Testdata: ");
                dump_table(blobmsg_data(tb[FOO_TESTDATA]), blobmsg_data_len(tb[FOO_TESTDATA]), 0, false);
        }
}
 
static void
fill_message(struct blob_buf *buf)
{
        void *tbl;
 
        blobmsg_add_string(buf, "message", "Hello, world!");
 
        tbl = blobmsg_open_table(buf, "testdata");
        blobmsg_add_double(buf, "dbl-min", DBL_MIN);
        blobmsg_add_double(buf, "dbl-max", DBL_MAX);
        blobmsg_add_u8(buf, "foo", 0);
        blobmsg_add_u8(buf, "poo", 100);
        blobmsg_add_u8(buf, "moo-min", INT8_MIN);
        blobmsg_add_u8(buf, "moo-max", INT8_MAX);
        blobmsg_add_u16(buf, "bar-min", INT16_MIN);
        blobmsg_add_u16(buf, "bar-max", INT16_MAX);
        blobmsg_add_u32(buf, "baz-min", INT32_MIN);
        blobmsg_add_u32(buf, "baz-max", INT32_MAX);
        blobmsg_add_u64(buf, "taz-min", INT64_MIN);
        blobmsg_add_u64(buf, "taz-max", INT64_MAX);
        blobmsg_add_string(buf, "world", "2");
        blobmsg_close_table(buf, tbl);
 
        tbl = blobmsg_open_array(buf, "list");
        blobmsg_add_u8(buf, NULL, 0);
        blobmsg_add_u8(buf, NULL, 100);
        blobmsg_add_u8(buf, NULL, INT8_MIN);
        blobmsg_add_u8(buf, NULL, INT8_MAX);
        blobmsg_add_u16(buf, NULL, INT16_MIN);
        blobmsg_add_u16(buf, NULL, INT16_MAX);
        blobmsg_add_u32(buf, NULL, INT32_MIN);
        blobmsg_add_u32(buf, NULL, INT32_MAX);
        blobmsg_add_u64(buf, NULL, INT64_MIN);
        blobmsg_add_u64(buf, NULL, INT64_MAX);
        blobmsg_add_double(buf, NULL, DBL_MIN);
        blobmsg_add_double(buf, NULL, DBL_MAX);
        blobmsg_close_table(buf, tbl);
}
 
int main(int argc, char **argv)
{
        char *json = NULL;
        static struct blob_buf buf;
 
        blobmsg_buf_init(&buf);
        fill_message(&buf);
        fprintf(stderr, "[*] blobmsg dump:\n");
        dump_message(&buf);
 
        json = blobmsg_format_json(buf.head, true);
        if (!json)
                exit(EXIT_FAILURE);
 
        fprintf(stderr, "\n[*] blobmsg to json: %s\n", json);
 
        blobmsg_buf_init(&buf);
        if (!blobmsg_add_json_from_string(&buf, json))
                exit(EXIT_FAILURE);
 
        fprintf(stderr, "\n[*] blobmsg from json:\n");
        dump_message(&buf);
 
        if (buf.buf)
                free(buf.buf);
        free(json);
 
        return 0;
}