[PATCH] D56230: [gdb-remote] Use lldb's portable Host::GetEnvironment() instead of getenv

[Hui Huang via Phabricator via llvm-commits]

Hui added a comment.

I think the key problem here is to make sure the argument will be treated as a single argument to the process launcher.

To be specific to this case only, could we just provide a quote char to argument log file path and log channels on Windows?

The downside is one more #if is introduced.

#ifdef _WIN32
char quote_char= '"';
#else
char quote_char='\0';
#endif

   std::string env_debugserver_log_channels =
       host_env.lookup("LLDB_SERVER_LOG_CHANNELS");
   if (!env_debugserver_log_channels.empty()) {
     debugserver_args.AppendArgument(
         llvm::formatv("--log-channels={0}", env_debugserver_log_channels)
             .str(), quote_char);
  }

In D56230#1350986 <https://reviews.llvm.org/D56230#1350986>, @labath wrote:

> > It is not that applicable for the windows process launcher to determine which entry in the args needs to be quoted unless given very specific flag or option.
>
> Why not? Given the argv parsing rules described here https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments?view=vs-2017, it sounds like it should be possible to create an algorithm doing the reverse mapping.
>  Something like this ought to do the trick:
>
>   for(string: Args) {
>     if (string.contains_either_of(" \t\"")  {
>       double_the_amount_of_backslashes_in_front_of_every_quote_char(string);
>       string = '"' + string '"';
>     }
>     cmdline += " " + string;
>   }
>





Repository:
  rLLDB LLDB

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  https://reviews.llvm.org/D56230/new/

https://reviews.llvm.org/D56230