Investigate error message truncation

[jgillis]

PluginInterface::load_plugin: Cannot load shared library 'libcasadi_conic_qpoases.so': 
   (
    Searched directories: 1. casadipath from GlobalOptions
                          2. CASADIPATH env var
                          3. PATH env var (Windows)
                          4. LD_LIBRARY_PATH env var (Linux)
                          5. DYLD_LIBRARY_PATH env var (osx)
    A library may be 'not found' even if the file exists:
          * library is not compatible (different compiler/bitness)
          * the dependencies are not found
   )
  Tried '/home/jgillis/programs/casadi/python_install/casadi' :
    Error code: /home/jgillis/programs/casadi/python_install/casadi/libcasadi_conic_qpoases.so: cannot open shared object file: No such file or directory
  Tried '' :
    Error code: libcasadi_conic_qpoases.so: cannot open shared object file: No such file or directory
  Tried '.' :
    Error code: ./libcasadi_... truncated") [.../casadi/core/plugin_interface.hpp:171]

[jgillis]

Occurs in

        std::stringstream preamble;
        for (int i = 0;i<1000;++i) {
          preamble << "foo bar baz\n";
        }
        uout() << preamble.str() << "stop" << std::endl; // truncated

        std::ofstream f;
        f.open("test.txt");//"w"); // normal
        f << preamble.str();

[jgillis]

Not present in C++; must be swig wrappers

[jgillis]

Caused by https://docs.python.org/3/c-api/sys.html#c.PySys_WriteStdout limit of 1000 bytes.

[jgillis]

    // Redirect printout
    static void pythonlogger(const char* s, std::streamsize num, bool error) {
      int n = num;
      while (n>0) {
        if (error) {
          PySys_WriteStderr("%.*s", std::min(n, 1000), s);
        } else {
          PySys_WriteStdout("%.*s", std::min(n, 1000), s);
        }
        n -= 1000;
        s += 1000;
      }
    }