Save work

std_singos/string.h

@@ -1,6 +1,40 @@
 void strcpy (destination, destination_segment, source, source_segment );
+int strlen (source, source_segment);
 void memcpy (destination, destination_segment, source, source_segment, num_bytes );
 
+int strlen (source, source_segment)
+{
+    #asm
+    #define strlen_SOURCE 4[bp];
+    #define strlen_SOURCE_SEGMENT 6[bp];
+    push bp
+    mov bp,sp
+    push ds
+    push bx
+
+    mov ax, strlen_SOURCE_SEGMENT
+    mov ds, ax
+
+    mov bx, strlen_SOURCE
+
+    label_strlen:
+       mov cx, #0x0            ; Set counte to zero
+    .label_strlen_loop: 
+       mov BYTE al, [bx] 
+       cmp al, #0x0 
+       je .label_strlen_done 
+       inc cx                  ; Count 1
+       inc bx                  ; Look at next char
+       jmp .label_strlen_loop
+    .label_strlen_done:
+       mov ax, cx 
+    
+    pop bx
+    pop ds
+    pop bp
+    #endasm
+}
+
 void strcpy (destination, destination_segment, source, source_segment )
 char *destination;
 int destination_segment;
@@ -20,7 +54,7 @@ int source_segment;
 
     push bp
     mov bp,sp
-    stringcompare:
+    label_strcpy:
         push ax
         push bx
         push di
@@ -36,13 +70,13 @@ int source_segment;
         mov ax, SOURCE_SEGMENT; 
         mov ds, ax
         mov cx, 0x050 // TODO(Jørn) Hardcded number of bytes to copy
-    .loop:
+    .label_strcpy_loop:
         movsb
         cmp cx, 0x0
-        je .end
+        je .label_strcpy_end
         dec cx
-        jmp .loop
-    .end:
+        jmp .label_strcpy_loop
+    .label_strcpy_end:
         pop ds
         pop si
         pop es
@@ -75,7 +109,7 @@ int num_bytes;
 
     push bp
     mov bp,sp
-    memcpy:
+    label_memcpy:
         push ax
         push bx
         push di
@@ -91,13 +125,13 @@ int num_bytes;
         mov ax, SOURCE_SEGMENT; 
         mov ds, ax
         mov cx, NUM_BYTES
-    .memcpy_loop:
+    .label_memcpy_loop:
         movsb
         cmp cx, 0x0
-        je .end
+        je .label_memcpy_end
         dec cx
-        jmp .loop
-    .memcpy_end:
+        jmp .label_memcpy_loop
+    .label_memcpy_end:
         pop ds
         pop si
         pop es