rename event buffer, add directory watching for windows (WIP/needs testing)

src/platform.c

@@ -4,7 +4,6 @@
 #include <stdint.h>
 #include <sys/inotify.h>
 #include <unistd.h>
-#define PLATFORM_INOTIFY_EVENT_BUFFER_SIZE 4096
 #endif
 
 #ifdef _WIN32
@@ -13,6 +12,8 @@
 #include <dlfcn.h>
 #endif
 
+#define EVENT_BUFFER_SIZE 4096
+
 void *platform_load_library(const char *path)
 {
 #ifdef _WIN32
@@ -60,7 +61,16 @@ void *platform_directory_watch_start(const char *path)
 
 	return (void *)(intptr_t)fd;
 #elif defined(_WIN32)
-	return NULL
+	HANDLE handle;
+	handle =
+	    CreateFileA(path, FILE_LIST_DIRECTORY,
+			FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+			NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
+
+	if (handle == INVALID_HANDLE_VALUE)
+		return NULL;
+
+	return (void *)handle;
 #else
 	return NULL
 #endif
@@ -76,7 +86,9 @@ void platform_directory_watch_stop(void *handle)
 	fd = (int)(intptr_t)handle;
 	close(fd);
 #elif defined(_WIN32)
-	(void)handle;
+	HANDLE h;
+	h = (HANDLE)handle;
+	CloseHandle(h);
 #else
 	(void)handle;
 #endif
@@ -86,7 +98,7 @@ char **platform_directory_watch_check(void *handle, size_t *out_count)
 {
 #ifdef __linux__
 	int fd;
-	char buffer[PLATFORM_INOTIFY_EVENT_BUFFER_SIZE];
+	char buffer[EVENT_BUFFER_SIZE];
 	ssize_t bytes_read;
 	struct inotify_event *event;
 	char *event_ptr;
@@ -139,6 +151,56 @@ char **platform_directory_watch_check(void *handle, size_t *out_count)
 	*out_count = index;
 	return file_list;
 #elif defined(_WIN32)
+	HANDLE h;
+	BYTE buffer[EVENT_BUFFER_SIZE];
+	DWORD bytes_returned;
+	FILE_NOTIFY_INFORMATION *info;
+	BYTE *event_ptr;
+	char **file_list;
+	size_t file_count, index;
+	int char_count;
+	BOOL result;
+
+	h = (HANDLE)handle;
+
+	result = ReadDirectoryChangesW(h, buffer, sizeof(buffer), FALSE,
+				       FILE_NOTIFY_CHANGE_FILE_NAME |
+					   FILE_NOTIFY_CHANGE_LAST_WRITE,
+				       &bytes_returned, NULL, NULL);
+	if (!result || bytes_returned == 0) {
+		*out_count = 0;
+		return NULL;
+	}
+
+	file_count = 0;
+	event_ptr = buffer;
+
+	while (1) {
+		info = (FILE_NOTIFY_INFORMATION *)event_ptr;
+		char_count = WideCharToMultiByte(
+		    CP_UTF8, info->FileName,
+		    info->FileNameLength / sizeof(WCHAR), NULL, 0, NULL, NULL);
+
+		if (char_count > 0) {
+			file_list[index] = malloc(char_count + 1);
+			if (file_list[index]) {
+				WideCharToMultiByte(
+				    CP_UTF8, 0, info->FileName,
+				    info->FileNameLength / sizeof(WCHAR),
+				    file_list[index], char_count, NULL, NULL);
+				file_list[index][char_count] = '\0';
+				++index
+			}
+		}
+
+		if (info->NextEntryOffset == 0)
+			break;
+
+		event_ptr += info->NextEntryOffset;
+	}
+
+	*out_count = index;
+	return file_list;
 #else
 #endif
 }