Terminate the output directory argument of flatc.

Given the command

flatc -o . -c test.fbs

it would generate header file

.test_generated.h

rather than

./test_generated.h

This fixes this issue.

Tested:
Manually verified that flatc generates the correct output files given output
paths ending with and without '/' on Linux and Windows.

Bug: 16464827
Change-Id: I854cb881286f22690f1885f942cf3fd2fc59ca8d

include/flatbuffers/util.h

@@ -25,6 +25,13 @@
 
 namespace flatbuffers {
 
+static const char kPosixPathSeparator = '/';
+#ifdef _WIN32
+static const char kPathSeparator = '\\';
+#else
+static const char kPathSeparator = kPosixPathSeparator;
+#endif // _WIN32
+
 // Convert an integer or floating point value to a string.
 // In contrast to std::stringstream, "char" values are
 // converted to a string of digits.

src/flatc.cpp

@@ -134,6 +134,10 @@ int main(int argc, const char *argv[]) {
         case 'o':
           if (++i >= argc) Error("missing path following", arg, true);
           output_path = argv[i];
+          if (!(output_path.back() == flatbuffers::kPathSeparator ||
+                output_path.back() == flatbuffers::kPosixPathSeparator)) {
+            output_path += flatbuffers::kPathSeparator;
+          }
           break;
         case 'S':
           opts.strict_json = true;
@@ -212,4 +216,3 @@ int main(int argc, const char *argv[]) {
 
   return 0;
 }
-

src/idl_gen_java.cpp

@@ -22,11 +22,9 @@
 
 #ifdef _WIN32
 #include <direct.h>
-#define PATH_SEPARATOR "\\"
 #define mkdir(n, m) _mkdir(n)
 #else
 #include <sys/stat.h>
-#define PATH_SEPARATOR "/"
 #endif
 
 namespace flatbuffers {
@@ -360,7 +358,7 @@ static bool SaveClass(const Parser &parser, const Definition &def,
         it != parser.name_space_.end(); ++it) {
     if (name_space_java.length()) {
       name_space_java += ".";
-      name_space_dir += PATH_SEPARATOR;
+      name_space_dir += kPathSeparator;
     }
     name_space_java += *it;
     name_space_dir += *it;
@@ -374,7 +372,7 @@ static bool SaveClass(const Parser &parser, const Definition &def,
     code += "import flatbuffers.*;\n\n";
   }
   code += classcode;
-  auto filename = name_space_dir + PATH_SEPARATOR + def.name + ".java";
+  auto filename = name_space_dir + kPathSeparator + def.name + ".java";
   return SaveFile(filename.c_str(), code, false);
 }
 
@@ -406,4 +404,3 @@ bool GenerateJava(const Parser &parser,
 }
 
 }  // namespace flatbuffers
-