bit.ascii2dec

if ascii is ‘0’-‘9’, set dec to that decimal digit value (end error=0). else, set error=1.
ascii is bit[:8], dec in bit[:4], and error(output-param) is a bit.

Signature

def ascii2dec error, dec, ascii @ half_dec, return_error, check_decimal, copy_decimal_value, nine4, end { ... }

Defined in bit/casting.fj — lines 93–114 (view on GitHub).

Complexity

• Time: 25@+56

• Space: 25@+56

See the complexity glossary for what @, w, dw, dbit, n mean.

Source

Click to view the macro body

def ascii2dec error, dec, ascii @ half_dec, return_error, check_decimal, copy_decimal_value, nine4, end {
    .zero error
    .zero 4, dec

    .cmp 4, ascii+4*dw, half_dec, return_error, check_decimal, return_error
  check_decimal:
    .cmp 4, ascii, nine4, copy_decimal_value, copy_decimal_value, return_error

    return_error:
        .not error
        ;end

    copy_decimal_value:
        .xor 4, dec, ascii
        ;end

  half_dec:
    .vec 4, 0x30>>4
  nine4:
    .vec 4, 9
  end:
}

Depends on

• bit.cmp/6

• bit.not/1

• bit.vec/2

• bit.xor/3

• bit.zero/1

• bit.zero/2

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