Match url encoding with emrun url decoding in src/emrun_postjs.js. Fixes #3394. Add test.

Author: juj

src/emrun_postjs.js

@@ -11,8 +11,8 @@ function emrun_register_handlers() {
     var prevErr = Module['printErr'];
     function emrun_exit() { post('^exit^'+EXITSTATUS); };
     Module['addOnExit'](emrun_exit);
-    Module['print'] = function emrun_print(text) { post('^out^'+(emrun_http_sequence_number++)+'^'+text); prevPrint(text); }
-    Module['printErr'] = function emrun_printErr(text) { post('^err^'+(emrun_http_sequence_number++)+'^'+text); prevErr(text); }
+    Module['print'] = function emrun_print(text) { post('^out^'+(emrun_http_sequence_number++)+'^'+encodeURIComponent(text)); prevPrint(text); }
+    Module['printErr'] = function emrun_printErr(text) { post('^err^'+(emrun_http_sequence_number++)+'^'+encodeURIComponent(text)); prevErr(text); }
   }
   // Notify emrun web server that this browser has successfully launched the page.
   post('^pageload^');

tests/test_browser.py

@@ -1967,7 +1967,7 @@ def test_emrun_info(self):
     assert 'Traceback' not in result
 
   def test_emrun(self):
-    Popen([PYTHON, EMCC, path_from_root('tests', 'hello_world_exit.c'), '--emrun', '-o', 'hello_world.html']).communicate()
+    Popen([PYTHON, EMCC, path_from_root('tests', 'test_emrun.c'), '--emrun', '-o', 'hello_world.html']).communicate()
     outdir = os.getcwd()
     # We cannot run emrun from the temp directory the suite will clean up afterwards, since the browser that is launched will have that directory as startup directory,
     # and the browser will not close as part of the test, pinning down the cwd on Windows and it wouldn't be possible to delete it. Therefore switch away from that directory
@@ -1985,6 +1985,8 @@ def test_emrun(self):
     assert 'argc: 4' in stdout
     assert 'argv[3]: --3' in stdout
     assert 'hello, world!' in stdout
+    assert 'Testing ASCII characters: !"$%&\'()*+,-./:;<=>?@[\\]^_`{|}~' in stdout
+    assert 'Testing char sequences: %20%21 &auml;' in stdout
     assert 'hello, error stream!' in stderr
 
   def test_uuid(self):

tests/test_emrun.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <emscripten.h>
+
+int main(int argc, char **argv) {
+  printf("argc: %d\n", argc);
+  for(int i = 0; i < argc; ++i) {
+    printf("argv[%d]: %s\n", i, argv[i]);
+  }
+
+  // Dump a file to local filesystem with emrun.
+  EM_ASM(emrun_file_dump("test.dat", HEAPU8.subarray(0, 128)););
+  EM_ASM(emrun_file_dump("heap.dat", HEAPU8));
+
+  if (argc <= 1)
+    exit(1);
+  printf("hello, world!\n");
+  fprintf(stderr, "hello, error stream!\n");
+
+  printf("Testing ASCII characters: !\"$%%&'()*+,-./:;<=>?@[\\]^_`{|}~\n");
+  printf("Testing char sequences: %%20%%21 &auml;\n");
+
+  exit(100);
+}
+