105 lines
1.5 KiB
NASM
105 lines
1.5 KiB
NASM
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printf:
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cld
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pop si
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push bp
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mov bp, sp
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.loop:
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mov al, [cs:si]
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inc si
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cmp al, 0x00
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je .end
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cmp al, 0x25
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je .handle_25h
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.literal:
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call putc
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jmp .loop
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.end:
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pop bp
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push si
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ret
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.handle_25h:
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mov al, [cs:si]
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inc si
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cmp al, 0x25
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je .literal
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cmp al, 0x58 ; 'X'
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je .printhex
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cmp al, 0x55 ; 'U'
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je .printdec
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cmp al, 0x53 ; 'S'
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je .printstr
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mov al, 0x3F
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jmp .literal
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.printhex:
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add bp, 2
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mov ax, [bp]
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mov bx, 0x0010
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call print_number
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jmp .loop
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.printdec:
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add bp, 2
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mov ax, [bp]
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mov bx, 0x000A
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call print_number
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jmp .loop
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.printstr:
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add bp, 2
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mov ax, [bp]
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call print_string
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jmp .loop
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; converts a integer to ascii
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; in ax input integer
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; bx base
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; cx minimum number of digits
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; out bx garbled
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; dx garbled
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print_number_padded:
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xor dx, dx
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div bx
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push dx
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dec cx
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jz .nopad
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call print_number_padded
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jmp print_number.end
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.nopad:
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call print_number
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jmp print_number.end
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; converts a integer to ascii
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; in ax input integer
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; bx base
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; out bx garbled
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; dx garbled
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print_number:
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xor dx, dx
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div bx ; ax = dx:ax / 10, dx = dx:ax % 10
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push dx
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and ax, ax
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jz .end
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call print_number
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.end:
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pop bx
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xor bh, bh
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add bx, print_chars
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mov al, [cs:bx]
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call putc
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ret
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; putc's a string
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; in DS:AX null-terminated string
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print_string:
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push si
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mov si, ax
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.loop:
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lodsb
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cmp al, 0x00
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je .end
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call putc
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jmp .loop
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.end:
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pop si
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ret
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print_chars:
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db "0123456789ABCDEF"
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