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#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <json-c/json.h>
#include "neural.h"
typedef struct Array {
double *data;
size_t shape[2];
} Array;
static Array json_read(const char *filepath);
Array json_read(const char *filepath)
{
Array out;
FILE *fp;
char *fp_buffer;
size_t ret;
int64_t fp_size;
fp = fopen(filepath, "r");
if (fp == NULL) goto json_read_error;
ret = (size_t)fseek(fp, 0L, SEEK_END);
if ((int)ret == -1) goto json_read_error;
fp_size = ftell(fp);
if (fp_size == -1) goto json_read_error;
rewind(fp);
fp_buffer = calloc(sizeof(char), fp_size);
if (fp_buffer == NULL) goto json_read_error;
ret = fread(fp_buffer, sizeof(char), (size_t)fp_size, fp);
if (ret != (size_t)fp_size) {
fprintf(stderr, "json_read() Error: fread bytes '%zd' does not match with buffer size '%zd'", ret, (size_t)fp_size);
exit(1);
}
json_object *json_obj;
json_obj = json_tokener_parse(fp_buffer);
size_t json_obj_length = json_object_array_length(json_obj);
out.shape[0] = (size_t)json_obj_length;
out.shape[1] = 4;
out.data = calloc(out.shape[0] * out.shape[1], sizeof(out.data[0]));
for (int i = 0; i < json_object_array_length(json_obj); i++) {
json_object *item = json_object_array_get_idx(json_obj, i);
out.data[4*i] = json_object_get_double(json_object_object_get(item, "area"));
out.data[4*i + 1] = json_object_get_double(json_object_object_get(item, "longitude"));
out.data[4*i + 2] = json_object_get_double(json_object_object_get(item, "latitude"));
out.data[4*i + 3] = json_object_get_double(json_object_object_get(item, "price"));
}
json_object_put(json_obj);
fclose(fp);
return out;
json_read_error:
perror("json_read() Error");
exit(1);
}
int main(void) {
Array json_data = json_read("data/housing_rent.json");
printf("area\tlong\tlat\tprice\n");
for (int i = 0; i < json_data.shape[0]; i++) {
printf("%3.1lf\t%3.2lf\t%3.2lf\t%lf\n",
json_data.data[4*i],
json_data.data[4*i + 1],
json_data.data[4*i + 2],
json_data.data[4*i + 3]);
}
free(json_data.data);
return 0;
}
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