Incorrectly encodes '+' character in URL paths

[dobey]

liboauth is incorrectly encoding the '+' character as ' ' in URL paths, treating every value passed to the encode method, as a value in the query string. This results in an incorrect signature base string, and signature, when a '+' character is part of the path element of the URL.

The offending code is on line 359 of oauth.c:

  // '+' represents a space, in a URL query string
  while ((qesc&1) && (tmp=strchr(t1,'+'))) *tmp=' ';