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/internal/parsing.h>
 
#include <botan/exceptn.h>
#include <istream>
 
namespace Botan {
 
namespace {
 
std::string clean_ws(std::string_view 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 std::string(s.substr(start, end));
   } else {
      return std::string(s.substr(start, start + end + 1));
   }
}
 
}  // namespace
 
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;
}
 
}  // namespace Botan