JSON was getting truncated at 1K

.gitignore

@@ -2,4 +2,4 @@
 bin/Debug/*
 bin/Release/*
 build/Debug/*
-build/Release/*
+build/Release/*

src/main.c

@@ -105,7 +105,6 @@ int8_t save_data_to_json_file(struct bme280_data *sensor_readings_data)
     char dateString[32];
     char timeString[32];
     char filename[100];
-    char jsonBuffer[1024];
     FILE *jsonFilePtr;
 
     struct json_object *parsed_json;
@@ -135,9 +134,21 @@ int8_t save_data_to_json_file(struct bme280_data *sensor_readings_data)
         fprintf(stderr, "Failed to open %s\n", filename);
         exit(1);
     }
-    fread(jsonBuffer, 1024, 1, jsonFilePtr);
+    fseek(jsonFilePtr, 0, SEEK_END);
+    long fileSize = ftell(jsonFilePtr);
+    rewind(jsonFilePtr);
+    char *jsonBuffer = malloc(fileSize + 1);
+    if (jsonBuffer == NULL)
+    {
+        fprintf(stderr, "Failed to allocate buffer for %s\n", filename);
+        fclose(jsonFilePtr);
+        exit(1);
+    }
+    fread(jsonBuffer, 1, fileSize, jsonFilePtr);
+    jsonBuffer[fileSize] = '\0';
 //printf("raw json read in: %s \n", jsonBuffer);
     parsed_json = json_tokener_parse(jsonBuffer);
+    free(jsonBuffer);
 
 //printf("json read in: %s \n", json_object_to_json_string(parsed_json));
 
@@ -186,8 +197,8 @@ int8_t save_data_to_json_file(struct bme280_data *sensor_readings_data)
     fseek(jsonFilePtr, 0, SEEK_SET);
     ftruncate(fileno(jsonFilePtr), 0);
     fputs(json_object_to_json_string(parsed_json), jsonFilePtr);
-printf("json to write out: %s \n", json_object_to_json_string(latest_reading_object));
-printf("new json to write out: %s \n", json_object_to_json_string(parsed_json));
+    printf("json to write out: %s \n", json_object_to_json_string(latest_reading_object));
+    printf("new json to write out: %s \n", json_object_to_json_string(parsed_json));
     fclose(jsonFilePtr);
     return 0;
 }