string to int -not wokr

kernel.nasm

@@ -2,6 +2,12 @@ BITS 16
 start_sing_os:
     mov si, welcome ; Put address of the null-terminated string to output into 'si'
     call print_os      ; Call our string-printing routine
+
+    mov si, number_one_zstring
+    call zstring_to_integer
+    call dumpax_os
+
+
     mov si, command_line
     call print_os
     jmp terminal
@@ -230,6 +236,8 @@ data_os:
     welcome db 'This is SingOS! v0.0.3', 13, 10, 'Press ESC to halt.', 13, 10, 0 
     exit_message db 13, 10, 'Goodbye from SingOS',13,10,'The system has halted.', 0
     command_line db 13, 10, 'groot@SingOS $ ', 0
+    number_one_zstring db '71', 0
+
 
 %include "lib/os_lib.nasm"
 %include "lib/string.nasm"
@@ -238,7 +246,7 @@ data_os:
 %include "lib/std_power.nasm"
 %include "lib/svim.nasm"
 %include "lib/ls.nasm"
-%include "vsfs/vsfs.nasm"
+;%include "vsfs/vsfs.nasm"
 
 times 131072-($-$$) db 0 ; 256 sectos 
 GLOBAL_VSFS_START db 'VSFS v0.1' ; sector 257 reserved for file system information

lib/string.nasm

@@ -23,3 +23,35 @@ stringcompare:
     pop bx
 
     ret
+
+zstring_to_integer: 
+    ;IN: si Pointer to string 
+    ;OUT: ax result in binary
+    push bx
+    push si
+    push cx
+    push dx
+    xor ax, ax
+    xor bx, bx
+    xor cx, cx
+    xor dx, dx
+    mov bx, 10
+.loop:
+    mov cl, [si]
+    cmp cl, 0
+    je .end
+    sub cl,'0'
+    cmp cl, 9
+    ja .end ; next number is not a number, or its a zero, and then we are done
+    ; multiply by 10, and add the new number.
+    mul bx
+    add ax, cx 
+    inc si
+    jmp .loop
+
+.end:
+    pop dx
+    pop cx
+    pop si 
+    pop bx    
+    ret    

lib/svim.nasm

@@ -44,10 +44,10 @@ svim:
     xor cx, cx
     xor ax, ax
     mov ah, 0x02    ;Read sectors from drive
-    mov al, 0x01    ;Number of sectors to read (8 * 512 = 4096 bytes)
-    mov ch, 0x02    ;Low 8 bits of cylinder
-    mov cl, 0x03    ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
-    mov dh, 0x01    ;Head number
+    mov al, 0x02    ;Number of sectors to read (8 * 512 = 4096 bytes)
+    mov ch, 0x06    ;Low 8 bits of cylinder
+    mov cl, 0x02    ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
+    mov dh, 0x00    ;Head number
     mov dl, 0x00    ;Drive number
     int 0x13 
 
@@ -97,9 +97,9 @@ svim:
     xor ax, ax 
     mov ah, 0x03     ;Write sectors to drive
     mov al, 0x01    ;Number of sectors to write (8 * 512 = 4096 bytes)
-    mov cl, 0x03    ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
-    mov ch, 0x02
-    mov dh, 0x01    ;Head number
+    mov cl, 0x02    ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
+    mov ch, 0x09
+    mov dh, 0x00    ;Head number
     mov dl, 0x0    ;Drive number
     int 0x13         ;Low level disk services
 

vsfs/vsfs.nasm

@@ -4,8 +4,8 @@ vsfs_read_file_index_in_ax:
     pusha ; save all register state
     call vsfs_convert_index_into_regs
     mov bx, .buffer_for_svim
-    xor cx, cx
     xor ax, ax
+    xor cx, cx
     mov ah, 0x02    ;Read sectors from drive
     mov al, 0x01    ;Number of sectors to read (8 * 512 = 4096 bytes)
     mov ch, 0x02    ;Low 8 bits of cylinder
@@ -50,12 +50,51 @@ vsfs_convert_index_into_regs:
     ; DH  Head
     ; The rest of the parameters is set in the read and write function.
 
+    mov 00000000
+    mov ch, ah
+    mov dh, 0x01
+
     ret
 
 vfsf_write_file_system_information:
 
 	ret
 
+vfsf_create_file: 
+    ; ax pointer to filename 
+    ; bx size
+    ; cx fileIndex
+    
+    .vfsf_create_file_type_filename db 'Enter filename: ', 0
+    .vfsf_create_file_type_filetype db 'Enter file index: ', 0
+
+    
+    pusha ; save all register state
+    ;AH  03h
+    ;AL  Sectors To Write Count
+    ;CH  Track
+    ;CL  Sector
+    ;DH  Head
+    ;DL  Drive
+    ;ES:BX   Buffer Address Pointer
+    mov bx, ds
+    mov es, bx
+    xor bx, bx
+    mov bx, .buffer_for_svim
+    xor cx, cx
+    xor ax, ax 
+    mov ah, 0x03     ;Write sectors to drive
+    mov al, 0x01    ;Number of sectors to write (8 * 512 = 4096 bytes)
+    mov cl, 0x03    ;First sector to read (bits 0-5), upper bits of cylinder (bits 6-7)
+    mov ch, 0x02
+    mov dh, 0x01    ;Head number
+    mov dl, 0x0    ;Drive number
+    int 0x13         ;Low level disk services
+    popa
+    ret
+
+    ret
+
 vfsf_list_files_command:
 	; This function takes the adress of the first sector of the disk 
 	; which the OS has to know