1 files changed, 107 insertions, 0 deletions
diff --git a/code/os.odin b/code/os.odin
new file mode 100644
index 000000000..dbfd7f723
--- /dev/null
+++ b/code/os.odin
@@ -0,0 +1,107 @@
+#import "runtime.odin" as _ // TODO(bill): make the compile import this automatically
+#import "win32.odin" as win32
+
+File :: type struct {
+	Handle :: type win32.HANDLE
+	handle: Handle
+}
+
+open :: proc(name: string) -> (File, bool) {
+	using win32
+	buf: [300]byte
+	copy(buf[:], name as []byte)
+	f := File{CreateFileA(^buf[0], FILE_GENERIC_READ, FILE_SHARE_READ, null, OPEN_EXISTING, 0, null)}
+	success := f.handle != INVALID_HANDLE_VALUE as File.Handle
+
+	return f, success
+}
+
+create :: proc(name: string) -> (File, bool) {
+	using win32
+	buf: [300]byte
+	copy(buf[:], name as []byte)
+	f := File{
+		handle = CreateFileA(^buf[0], FILE_GENERIC_WRITE, FILE_SHARE_READ, null, CREATE_ALWAYS, 0, null),
+	}
+	success := f.handle != INVALID_HANDLE_VALUE as File.Handle
+	return f, success
+}
+
+
+close :: proc(using f: ^File) {
+	win32.CloseHandle(handle)
+}
+
+write :: proc(using f: ^File, buf: []byte) -> bool {
+	bytes_written: i32
+	return win32.WriteFile(handle, buf.data, buf.count as i32, ^bytes_written, null) != 0
+}
+
+
+File_Standard :: type enum {
+	INPUT,
+	OUTPUT,
+	ERROR,
+	COUNT,
+}
+
+__std_files := __set_file_standards();
+
+__set_file_standards :: proc() -> [File_Standard.COUNT as int]File {
+	return [File_Standard.COUNT as int]File{
+		File{handle = win32.GetStdHandle(win32.STD_INPUT_HANDLE)},
+		File{handle = win32.GetStdHandle(win32.STD_OUTPUT_HANDLE)},
+		File{handle = win32.GetStdHandle(win32.STD_ERROR_HANDLE)},
+	}
+}
+
+get_standard_file :: proc(std: File_Standard) -> ^File {
+	return ^__std_files[std]
+}
+
+
+read_entire_file :: proc(name: string) -> (string, bool) {
+	buf: [300]byte
+	copy(buf[:], name as []byte)
+
+	f, file_ok := open(name)
+	if !file_ok {
+		return "", false
+	}
+	defer close(^f)
+
+	length: i64
+	file_size_ok := win32.GetFileSizeEx(f.handle as win32.HANDLE, ^length) != 0
+	if !file_size_ok {
+		return "", false
+	}
+
+	data := new_slice(u8, length)
+	if data.data == null {
+		return "", false
+	}
+
+	single_read_length: i32
+	total_read: i64
+
+	for total_read < length {
+		remaining := length - total_read
+		to_read: u32
+		MAX :: 1<<32-1
+		if remaining <= MAX {
+			to_read = remaining as u32
+		} else {
+			to_read = MAX
+		}
+
+		win32.ReadFile(f.handle as win32.HANDLE, ^data[total_read], to_read, ^single_read_length, null)
+		if single_read_length <= 0 {
+			free(data.data)
+			return "", false
+		}
+
+		total_read += single_read_length as i64
+	}
+
+	return data as string, true
+}