Updated screen code. Added puthex and putdec functions and wrapped zero case for putdec in unlikely macro since we do not expect it to happen often (statistically anyway)

Author: unknown

scrn.c

@@ -82,13 +82,12 @@ void putch(unsigned char c)
 unsigned short*where;
 unsignedatt=attrib << 8;
 
-/* Handle a backspace, by moving the cursor back one space */
+/*Backspace Code*/
 if(c==0x08)
 {
 if(csr_x!=0) csr_x--;
  }
-/* Handles a tab by incrementing the cursor's x, but only
- * to a point that will make it divisible by 8 */
+
 elseif(c==0x09)
 {
 csr_x= (csr_x+8) & ~(8-1);
@@ -132,6 +131,7 @@ void putch(unsigned char c)
 }
 
 /* Uses the above routine to output a string... */
+
 voidputs(unsigned char*text)
 {
 inti;
@@ -142,15 +142,80 @@ void puts(unsigned char *text)
  }
 }
 
-/* Sets the forecolor and backcolor that we will use */
+voidputdec(unsigned intn)
+{
+/* Statistically, we do NOT expect this to be 0 */
+if(__builtin_expect((n<1), 0))
+{
+putch('0');
+return;
+ }
+else
+{
+charc[32];
+inti=0;
+while (n>0)
+
+{
+c[i] ='0'+ (n%10);
+n /= 10;
+i++;
+ }
+c[i] =0;
+
+charc2[i+1];
+c2[i--] =0;
+intj=0;
+while(i >= 0)
+{
+c2[i--] =c[j++];
+ }
+puts(c2); 
+ }
+
+}
+
+voidputhex(unsigned intn)
+{
+inttmp;
+
+puts("0x");
+inti;
+/* Chop our 32 bit type into groups of 4 and convert */
+for (i=28; i>0; i-=4)
+{
+tmp= (n >> i) &0xF;
+
+if (tmp >= 0xA)
+{
+putch (tmp-0xA+'a' );
+ }
+else
+{
+putch( tmp+'0' );
+ }
+ }
+
+tmp=n&0xF;
+if (tmp >= 0xA)
+{
+putch (tmp-0xA+'a');
+ }
+else
+{
+putch (tmp+'0');
+ }
+}
+
+
 voidsettextcolor(unsigned charforecolor, unsigned charbackcolor)
 {
 /* Top 4 bytes are the background, bottom 4 bytes
  * are the foreground color */
 attrib= (backcolor << 4) | (forecolor&0x0F);
 }
 
-/* Sets our text-mode VGA pointer, then clears the screen for us */
+
 voidinit_video(void)
 {
 textmemptr= (unsigned short*)0xB8000;