1 files changed, 53 insertions, 0 deletions
diff --git a/kscurses/utils.jai b/kscurses/utils.jai
new file mode 100644
index 0000000..2b88e85
--- /dev/null
+++ b/kscurses/utils.jai
@@ -0,0 +1,53 @@
+// array_slice :: (array : []$T, left : int, right : int) -> []T {
+// 	assert(left <= right && left >= 0 && right <= array.count);
+// 	result : []T;
+// 	result.data, result.count = array.data + left, right - left;
+// 	return result;
+// }
+
+length_code :: inline (c : u64) -> u8 {
+	for 0..7 {
+		if !c return xx it;
+		c >>= 8;
+	}
+	return 8;
+}
+utf8 :: (str : string) -> u32 {
+	code : u32;
+	assert(str.count <= 4);
+	memcpy(*code, str.data, str.count);
+	return code;
+}
+byteswap_64 :: (c : u64) -> u64 {
+	c = ((0xFFFFFFFF00000000 & c) >> 32) | ((0x00000000FFFFFFFF & c) << 32);
+	c = ((0xFFFF0000FFFF0000 & c) >> 16) | ((0x0000FFFF0000FFFF & c) << 16);
+	c = ((0xFF00FF00FF00FF00 & c) >>  8) | ((0x00FF00FF00FF00FF & c) <<  8);
+	return c;
+}
+byteswap_32 :: (c : u32) -> u32 {
+	c = ((0xFFFF0000 & c) >> 16) | ((0x0000FFFF & c) << 16);
+	c = ((0xFF00FF00 & c) >>  8) | ((0x00FF00FF & c) <<  8);
+	return c;
+}
+char_bs :: (code : u32) -> u32 {
+	l := length_code(code);
+	return byteswap_32(code) >> ((8 - l) * 8);
+}
+utf8_bs :: (str : string) -> u32 {
+	return char_bs(utf8(str));
+}
+arrow_code_to_ivec2 :: (key : Key, $swap_y := true) -> ivec2 {
+	#if swap_y {
+		return	 ifx key == .UP		ivec2.{ 0, -1}
+			else ifx key == .RIGHT	ivec2.{ 1,  0}
+			else ifx key == .DOWN	ivec2.{ 0,  1}
+			else ifx key == .LEFT	ivec2.{-1,  0}
+			else ivec2.{};		
+	} else {
+		return	 ifx key == .UP		ivec2.{ 0,  1}
+			else ifx key == .RIGHT	ivec2.{ 1,  0}
+			else ifx key == .DOWN	ivec2.{ 0, -1}
+			else ifx key == .LEFT	ivec2.{-1,  0}
+			else ivec2.{};		
+	}
+}