First commit: files added, very first step on first edition c std-lib, and the lsfs implemenation

std_singos/string.h

@@ -0,0 +1,54 @@
+void strcpy (destination, destination_segment, source, source_segment );
+
+void strcpy (destination, destination_segment, source, source_segment )
+char *destination;
+int destination_segment;
+char *source;
+int source_segment;
+{
+    #asm
+    ; copy two strings
+    ; IN si: the first (zero terminated) string
+    ; IN di: the second (zero terminated) string
+    ; OUT SF and ZF (same semantics as cmp)
+    
+    #define DESTINATION 4[bp];
+    #define DESTINATION_SEGMENT 6[bp];
+    #define SOURCE 8[bp];
+    #define SOURCE_SEGMENT 10[bp];
+
+    push bp
+    mov bp,sp
+    stringcompare:
+        push ax
+        push bx
+        push di
+        push es
+        push si
+        push ds
+        mov ax, DESTINATION; 
+        mov di, ax
+        mov ax, DESTINATION_SEGMENT; 
+        mov es, ax
+        mov ax, SOURCE; 
+        mov si, ax
+        mov ax, SOURCE_SEGMENT; 
+        mov ds, ax
+        mov cx, 0x050
+    .loop:
+        movsb
+        cmp cx, 0x0
+        je .end
+        dec cx
+        jmp .loop
+    .end:
+        pop ds
+        pop si
+        pop es
+        pop di
+        pop bx
+        pop ax
+        pop bp
+
+    #endasm
+}