Fix tinydir_file_open with filename only failure in Windows (fixes #35)

Implement file_open_test for Windows

tests/CMakeLists.txt

@@ -12,7 +12,7 @@ add_subdirectory(cbehave)
 if(MSVC)
 	add_definitions(-W4 -WX -wd"4127" -wd"4102" -wd"4996")
 else()
-	add_definitions(-fsigned-char -Wall -W -Wshadow -Wpointer-arith -Wcast-qual -Winline -Werror -Wno-unused-label -Wno-unused-parameter)
+	add_definitions(-fsigned-char -Wall -W -Wshadow -Wpointer-arith -Wcast-qual -Winline -Werror -Wno-unused-label)
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wstrict-prototypes")
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
 	if("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")

tests/cbehave/cbehave.h

@@ -157,7 +157,7 @@ if (!(cond)) {\
 } while(0)
 
 #define CBEHAVE_RUN(_description, ...)\
-int main(int argc, char *argv[]) {\
+int main() {\
 	cbehave_feature _cfeatures[] = {__VA_ARGS__};\
 	return cbehave_runner(_description, _cfeatures);\
 }

tests/file_open_test.c

@@ -1,16 +1,34 @@
 #include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
 
 #include <tinydir.h>
 #include "cbehave.h"
 
+static void make_temp_file(const char *prefix, char *out)
+{
+#ifdef _MSC_VER
+	if (GetTempFileName(".", prefix, 0, out) != 0)
+	{
+		// Strip the ".\\" prefix
+		if (strncmp(out, ".\\", 2) == 0)
+		{
+			memmove(out, out + 2, strlen(out));
+		}
+		// Create file
+		fclose(fopen(out, "w"));
+	}
+#else
+	#include <stdlib.h>
+	#include <unistd.h>
+	sprintf(out, "%sXXXXXX", prefix);
+	close(mkstemp(out));
+#endif
+}
+
 FEATURE(file_open, "File open")
 	SCENARIO("Open file in current directory")
 		GIVEN("a file in the current directory")
-			char name[] = "fileXXXXXX";
-			int fd = mkstemp(name);
-			close(fd);
+			char name[4096];
+			make_temp_file("temp_file_", name);
 		WHEN("we open it")
 			tinydir_file file;
 			int r = tinydir_file_open(&file, name);

tinydir.h

@@ -641,6 +641,12 @@ int tinydir_file_open(tinydir_file *file, const _tinydir_char_t *path)
 		errno = EINVAL;
 		return -1;
 	}
+	/* Emulate the behavior of dirname by returning "." for dir name if it's
+	empty */
+	if (drive_buf[0] == '\0' && dir_name_buf[0] == '\0')
+	{
+		strcpy(dir_name_buf, ".");
+	}
 	/* Concatenate the drive letter and dir name to form full dir name */
 	_tinydir_strcat(drive_buf, dir_name_buf);
 	dir_name = drive_buf;