Minor program improvements

src/programs/misc.c

@@ -0,0 +1,31 @@
+// Miscellaneous small programs
+
+#include "../libc/stdio.h"
+
+// Print a rainbow colorful text for testing
+
+#define BUF_SIZE 256
+#define COLORS 20
+
+void program_rainbow()
+{
+	char input_buffer[BUF_SIZE];
+	puts("What to print? ");
+	get_input(input_buffer, BUF_SIZE);	
+	puts("\n");
+
+	for (int i=0; i<COLORS; i++)
+	{
+		colorputs(input_buffer, i);
+		puts("\n");
+	}	
+}
+
+// Clear the terminal
+
+#define ROWS 25
+
+void program_clear()
+{	
+	for (int i=0; i<ROWS; i++) scroll(1);
+}