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57 lines
973 B
57 lines
973 B
BITS 16
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; Compares two strings
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; IN si: the first (zero terminated) string
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; IN di: the second (zero terminated) string
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; OUT SF and ZF (same semantics as cmp)
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stringcompare:
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push bx
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push si
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push di
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.loop:
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mov bl, [si]
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mov bh, [di]
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cmp bl, bh
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jne .end
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test bl, bl ; bl and bh are the same, so bl = 0 => dl = 0
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jz .end
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inc si
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inc di
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jmp .loop
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.end:
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pop di
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pop si
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pop bx
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ret
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zstring_to_integer:
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;IN: si Pointer to string
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;OUT: ax result in binary
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push bx
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push si
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push cx
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push dx
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xor ax, ax
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xor bx, bx
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xor cx, cx
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xor dx, dx
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mov bx, 10
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.loop:
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mov cl, [si]
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cmp cl, 0
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je .end
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sub cl,'0'
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cmp cl, 9
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ja .end ; next number is not a number, or its a zero, and then we are done
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; multiply by 10, and add the new number.
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mul bx
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add ax, cx
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inc si
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jmp .loop
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.end:
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pop dx
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pop cx
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pop si
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pop bx
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ret
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