lsfs_16-bit/std_singos/stdio.h

void print(string);
void* dump_ax_return(input);

void print(string)
char* string;
{
#asm 
    push bp
    mov bp,sp
    mov si,4[bp]

    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    new_print_print:
    ; Prints string in si
    ; IN si: zero terminated string to print
    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
        mov ah, #0xE     ; Specify 'int 0x10' 'teletype output' function
                        ; [AL = Character, BH = Page Number, BL = Colour (in graphics mode)]
    .new_print_printchar:
        lodsb           ; Load byte at address SI into AL, and increment SI
        test al, al
        jz .new_print_done        ; If the character is zero (NUL), stop writing the string
        int #0x10         ; Otherwise, print the character via 'int 0x10'
        jmp .new_print_printchar  ; Repeat for the next character
    .new_print_done:

    pop bp
#endasm
}


void print_stack(argument)
{
#asm 
    push bp
    mov bp,sp
    push ds
    push ax

    mov ax, ss
    mov ds, ax
    mov si,4[bp]
    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
    print_stack_print:
    ; Prints string in si
    ; IN si: zero terminated string to print
    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
        mov ah, #0xE     ; Specify 'int 0x10' 'teletype output' function
                        ; [AL = Character, BH = Page Number, BL = Colour (in graphics mode)]
    .print_stack_printchar:
        lodsb           ; Load byte at address SI into AL, and increment SI
        test al, al
        jz .print_stack_done        ; If the character is zero (NUL), stop writing the string
        int #0x10         ; Otherwise, print the character via 'int 0x10'
        jmp .print_stack_printchar  ; Repeat for the next character
    .print_stack_done:
    
    pop ax
    pop ds
    pop bp
#endasm
}

void* dump_ax_return(input)
void* input;
{
    return input;
}

void dump_ax(input)
void* input;
{
    dump_ax_return(input)
#asm
    push bp
    mov bp,sp

    pusha           ; save registers
    mov bx, ax
    mov ah, #0xE     ; Teletype output

    mov cx, #4       ; 4 nipples in a 16 bit word
    .dump_ax_loop:
    rol bx, #4       ; rotate to next nipple
    mov al, bl      ; we copy to al because we need to mask only the low 4 bits
    and al, #%1111   ; Do the masking
    add al, #48     ; convert to ASCII
    cmp al, #57     ; If we are greater than 9 ascii, we add 7 to make digit 10 be represented as 'A'
    jbe .dump_ax_skip       ;  -|-
    add al, #7       ;  -|-
    .dump_ax_skip:          ;  -|-
    int #0x10        ; BIOS call 'output'
    loop .dump_ax_loop

    popa            ; restore registers

    pop bp
#endasm
}

void print_newline()
{
    #asm 
    printCRLF:
    mov ah, #0xE
    mov al, #13
    int #0x10
    mov al, #10
    int #0x10
    ret
    #endasm
}