tbi: add sub-module 'screen'

2 files changed, 65 insertions, 0 deletions

diff --git a/lib/tbi/screen.c b/lib/tbi/screen.c
new file mode 100644
index 0000000..7eb9ac2
--- /dev/null
+++ b/lib/tbi/screen.c
@@ -0,0 +1,35 @@
+#include <Uefi.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+#include "screen.h"
+
+struct screen *prepare_screen(VOID)
+{
+	struct screen *scr;
+	scr = AllocateZeroPool(sizeof(struct screen));
+	if(!scr)
+		return NULL;
+
+	scr->stdin = gST->ConIn;
+	scr->stdout = gST->ConOut;
+	scr->stderr = gST->StdErr;
+
+	gST->ConOut->QueryMode(
+		gST->ConOut,
+		gST->ConOut->Mode->Mode,
+		&(scr->columns),
+		&(scr->lines)
+	);
+
+	return scr;
+}
+
+VOID forget_screen(struct screen *scr)
+{
+	ASSERT(scr != NULL);
+
+	FreePool(scr);
+}
diff --git a/lib/tbi/screen.h b/lib/tbi/screen.h
new file mode 100644
index 0000000..ae25640
--- /dev/null
+++ b/lib/tbi/screen.h
@@ -0,0 +1,30 @@
+#ifndef UFM_TBI_SCREEN_H
+#define UFM_TBI_SCREEN_H
+
+#include <Uefi.h>
+
+struct screen
+{
+	EFI_SIMPLE_TEXT_INPUT_PROTOCOL *stdin;
+	EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *stdout;
+	EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *stderr;
+	UINTN columns, lines; // current screen size
+};
+
+/*
+ * Prepares a structure with information about screen
+ *
+ * return: A pointer to the allocated structure or NULL if allocation fails
+*/
+struct screen *prepare_screen(VOID);
+
+/*
+ * Frees the structure of the screen
+ *
+ * scr: the screen on which to operate
+ *
+ * return: VOID
+*/
+VOID forget_screen(struct screen *scr);
+
+#endif /* UFM_TBI_SCREEN_H */