Try another approach to fixing the bug in the #1922 test.

This isn't elegant, but it seems to be the best way around all of
the issues involved in escaping and quoting that we've gotten into
over the years.

src/test/test_config.c

@@ -5164,6 +5164,8 @@ test_config_include_path_syntax(void *data)
 
   config_line_t *result = NULL;
   char *dir = tor_strdup(get_fname("test_include_path_syntax"));
+  char *esc_dir = NULL, *dir_with_pathsep = NULL,
+    *esc_dir_with_pathsep = NULL, *torrc_contents = NULL;
   tt_ptr_op(dir, OP_NE, NULL);
 
 #ifdef _WIN32
@@ -5172,18 +5174,18 @@ test_config_include_path_syntax(void *data)
   tt_int_op(mkdir(dir, 0700), OP_EQ, 0);
 #endif
 
-#ifdef _WIN32
-#define ESCAPED_PATH_SEPARATOR "\\" PATH_SEPARATOR
-#else
-#define ESCAPED_PATH_SEPARATOR PATH_SEPARATOR
-#endif
 
-  char torrc_contents[1000];
-  tor_snprintf(torrc_contents, sizeof(torrc_contents),
-               "%%include \"%s\"\n"
-               "%%include %s"PATH_SEPARATOR"\n"
-                "%%include \"%s"ESCAPED_PATH_SEPARATOR"\"\n",
-               dir, dir, dir);
+  esc_dir = esc_for_log(dir);
+  tor_asprintf(&dir_with_pathsep, "%s%s", dir, PATH_SEPARATOR);
+  esc_dir_with_pathsep = esc_for_log(dir_with_pathsep);
+
+  tor_asprintf(&torrc_contents,
+               "%%include %s\n"
+               "%%include %s%s \n" // space to avoid suppressing newline
+               "%%include %s\n",
+               esc_dir,
+               dir, PATH_SEPARATOR,
+               esc_dir_with_pathsep);
 
   int include_used;
   tt_int_op(config_get_lines_include(torrc_contents, &result, 0,&include_used),
@@ -5194,6 +5196,10 @@ test_config_include_path_syntax(void *data)
  done:
   config_free_lines(result);
   tor_free(dir);
+  tor_free(torrc_contents);
+  tor_free(esc_dir);
+  tor_free(dir_with_pathsep);
+  tor_free(esc_dir_with_pathsep);
 }
 
 static void