8007333: [launcher] removes multiple back slashes

Reviewed-by: alanb, akhil

src/windows/bin/cmdtoargs.c

@@ -128,7 +128,9 @@ static char* next_arg(char* cmdline, char* arg, jboolean* wildcard) {
                 *wildcard = JNI_TRUE;
             }
             if (prev == '\\') {
-                *dest++ = prev;
+                for (i = 0 ; i < slashes ; i++) {
+                    *dest++ = prev;
+                }
             }
             *dest++ = ch;
             break;
@@ -184,7 +186,7 @@ void JLI_CmdToArgs(char* cmdline) {
         argv = (StdArg*) JLI_MemRealloc(argv, (nargs+1) * sizeof(StdArg));
         argv[nargs].arg = JLI_StringDup(arg);
         argv[nargs].has_wildcard = wildcard;
-
+        *arg = NULL;
         nargs++;
     } while (src != NULL);
 
@@ -602,6 +604,14 @@ int main(int argc, char* argv[]) {
     v->add("d", FALSE);
     vectors[i++] = v;
 
+    v= new Vector(argv[0], "\\\\?");
+    v->add("\\\\?", TRUE);
+    vectors[i++] = v;
+
+    v= new Vector(argv[0], "\\\\*");
+    v->add("\\\\*", TRUE);
+    vectors[i++] = v;
+
     dotest(vectors);
     printf("All tests pass [%d]\n", i);
     doexit(0);

test/tools/launcher/Arrrghs.java

@@ -24,7 +24,7 @@
 /**
  * @test
  * @bug 5030233 6214916 6356475 6571029 6684582 6742159 4459600 6758881 6753938
- *      6894719 6968053 7151434 7146424
+ *      6894719 6968053 7151434 7146424 8007333
  * @summary Argument parsing validation.
  * @compile -XDignore.symbol.file Arrrghs.java
  * @run main/othervm Arrrghs
@@ -310,6 +310,20 @@ public class Arrrghs extends TestHelper {
         checkArgumentParsing("..\\..\\", "..\\..\\");
         checkArgumentParsing("../../", "../../");
         checkArgumentParsing("a b\\ c", "a", "b\\", "c");
+        // 2 back-slashes
+        checkArgumentParsing("\\\\?", "\\\\?");
+        // 3 back-slashes
+        checkArgumentParsing("\\\\\\?", "\\\\\\?");
+        // 4 back-slashes
+        checkArgumentParsing("\\\\\\\\?", "\\\\\\\\?");
+        // 5 back-slashes
+        checkArgumentParsing("\\\\\\\\\\?", "\\\\\\\\\\?");
+        // 6 back-slashes
+        checkArgumentParsing("\\\\\\\\\\\\?", "\\\\\\\\\\\\?");
+
+        // more treatment of  mixed slashes
+        checkArgumentParsing("f1/ f3\\ f4/", "f1/", "f3\\", "f4/");
+        checkArgumentParsing("f1/ f2\' ' f3/ f4/", "f1/", "f2\'", "'", "f3/", "f4/");
     }
 
     private void initEmptyDir(File emptyDir) throws IOException {