read_cfg.cpp

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/*
* Simple config/test file reader
* (C) 2013,2014,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/parsing.h>
#include <botan/exceptn.h>

namespace Botan {

std::string clean_ws(const std::string& s)
   {
   const char* ws = " \t\n";
   auto start = s.find_first_not_of(ws);
   auto end = s.find_last_not_of(ws);

   if(start == std::string::npos)
      return "";

   if(end == std::string::npos)
      return s.substr(start, end);
   else
      return s.substr(start, start + end + 1);
   }

std::map<std::string, std::string> read_cfg(std::istream& is)
   {
   std::map<std::string, std::string> kv;
   size_t line = 0;

   while(is.good())
      {
      std::string s;

      std::getline(is, s);

      ++line;

      if(s.empty() || s[0] == '#')
         continue;

      s = clean_ws(s.substr(0, s.find('#')));

      if(s.empty())
         continue;

      auto eq = s.find("=");

      if(eq == std::string::npos || eq == 0 || eq == s.size() - 1)
         throw Decoding_Error("Bad read_cfg input '" + s + "' on line " + std::to_string(line));

      const std::string key = clean_ws(s.substr(0, eq));
      const std::string val = clean_ws(s.substr(eq + 1, std::string::npos));

      kv[key] = val;
      }

   return kv;
   }

}