Fixed hideous build errors and non-typing keys producing spaces

src/io.c

@@ -6,16 +6,16 @@
 #include "term.h"
 #include "comp.h"
 
-char scan_map[256] = {'','','1','2','3','4','5','6','7','8','9','0','-','=','\b','\t',
-		      'q','w','e','r','t','y','u','i','o','p','[',']','\n','^','a','s',
-		      'd','f','g','h','j','k','l',';','\'','`','S','\\','z','x','c','v',
-		      'b','n','m',',','.','/','','','',' ','','','','','','',
-		      '','','','','','',''};
-char shift_map[256] = {'','','!','@','#','$','%','^','&','*','(',')','_','+','\b','\t',
-		      'Q','W','E','R','T','Y','U','I','O','P','{','}','\n','^','A','S',
+char scan_map[256] = {'\0','\0','1','2','3','4','5','6','7','8','9','0','-','=','\b','\t',
+		      'q','w','e','r','t','y','u','i','o','p','[',']','\n','\0','a','s',
+		      'd','f','g','h','j','k','l',';','\'','`','\0','\\','z','x','c','v',
+		      'b','n','m',',','.','/','\0','\0','\0',' ','\0','\0','\0','\0','\0','\0',
+		      '\0','\0','\0','\0','\0','\0','\0'};
+char shift_map[256] = {'\0','\0','!','@','#','$','%','^','&','*','(',')','_','+','\b','\t',
+		      'Q','W','E','R','T','Y','U','I','O','P','{','}','\n','\0','A','S',
 		      'D','F','G','H','J','K','L',':','\"','~','S','|','Z','X','C','V',
-		      'B','N','M','<','>','?','','','',' ','','','','','','',
-		      '','','','','','',''};
+		      'B','N','M','<','>','?','\0','\0','\0',' ','\0','\0','\0','\0','\0','\0',
+		      '\0','\0','\0','\0','\0','\0','\0'};
 char kb_buf[256];
 int kb_buf_size;
 int modifiers[6] = {0,0,0};
@@ -155,7 +155,7 @@ void kbd_irq()
 		    terminal_putchar(in);
 		}
 	    }
-	    else
+	    else if(in!='\0')
 	    {
 		kb_buf[kb_buf_size]=in;
 		kb_buf_size++;