Added very basic interactive shell.

src/main.c

@@ -2,6 +2,7 @@
 #include "../include/gdt.h"
 #include "../include/idt.h"
 #include "../include/scrn.h"
+#include "../include/shell.h"
 
 unsigned char *memcpy(unsigned char *dest, const unsigned char *src, int count)
 {
@@ -44,6 +45,24 @@ int strlen(const char *str)
     return retval;
 }
 
+bool strcmp(char* str1, char* str2)
+{
+	int len1 = strlen(str1);
+	int len2 = strlen(str2);
+
+	if(len1 != len2)
+	{
+		puts("Lengths different!\n");
+		return false;
+	}
+	for(int i = len1; i >= 0; i--)
+	{
+		if(str1[i] != str2[i]) return false;
+	}
+
+	return true;
+}
+
 /* We will use this later on for reading from the I/O ports to get data
 *  from devices such as the keyboard. We are using what is called
 *  'inline assembly' in these routines to actually do the work */
@@ -87,6 +106,7 @@ void main()
 	kb_install();
 	puts("Keyboard installed.\n");
 	puts("SDOS version 0.0.0.1 initialized.\n");
+	run_shell();
 	//puts(&__BUILD_DATE);
 	//puts(&__BUILD_NUMBER);
 	//puts("Divide by zero check:\n");