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pkexec: improve pkexec authentication message

Vincent Mihalkovic requested to merge vmihalko/polkit:vmihalko-pkexec-auth-message into master

This MR is an improved version of the !90 (closed).

Instead of the program variable, output the command_line. If is the length of a command_line bigger than 80 characters output: "{first 38 chars} ... {last 42 chars}"

  gchar *cmdline_short = NULL;
  // A newly-allocated copy of command_line
  cmdline_short = g_strdup(command_line);
  // Copies a null-terminated string into the dest buffer,
  // include the trailing null, and return a pointer to the
  // trailing null byte.
  if (strlen(command_line) > 80)
      g_stpcpy(g_stpcpy( cmdline_short + 38, " ... " ),
               command_line + strlen(command_line) - 37 );

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