rework config management

* Add standard way to do str2val and val2str conversion
* Add support for a config file
* Add support for reading and writing settings via ioctl

src/to_string.cpp

@@ -0,0 +1,58 @@
+/*
+  ISC License
+
+  Copyright (c) 2019, Antonio SJ Musumeci <trapexit@spawn.link>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include <string>
+
+#include <inttypes.h>
+#include <stdint.h>
+#include <stdio.h>
+
+namespace str
+{
+  std::string
+  to(const bool bool_)
+  {
+    return (bool_ ? "true" : "false");
+  }
+
+  std::string
+  to(const int int_)
+  {
+    char buf[24];
+
+    sprintf(buf,"%d",int_);
+
+    return buf;
+  }
+
+  std::string
+  to(const uint64_t uint64_)
+  {
+    char buf[64];
+
+    sprintf(buf,"%llu",(unsigned long long)uint64_);
+
+    return buf;
+  }
+
+  std::string
+  to(const std::string &s_)
+  {
+    return s_;
+  }
+}