Make exceptions easier to translate to error codes

Avoid throwing base Botan::Exception type, as it is difficult to
determine what the error is in that case.

Add Exception::error_code and Exception::error_type which allows
(for error code) more information about the error and (for error type)
allows knowing the error type without requiring a sequence of catches.

See GH #1742

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/utils/read_cfg.cpp b/src/lib/utils/read_cfg.cpp
index bf68c0479..02f2e0ac8 100644
--- a/src/lib/utils/read_cfg.cpp
+++ b/src/lib/utils/read_cfg.cpp
@@ -49,7 +49,7 @@ std::map<std::string, std::string> read_cfg(std::istream& is)
       auto eq = s.find("=");
 
       if(eq == std::string::npos || eq == 0 || eq == s.size() - 1)
-         throw Exception("Bad read_cfg input '" + s + "' on line " + std::to_string(line));
+         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));