`hex.input_dec_uint_until`¶

dst[:n] = the unsigned decimal number read from input (mod 16^n).

Reads ASCII '0'..'9' and STOPS at the first non-digit byte, which is stored in stop_byte[:2]. The primitive behind hex.input_dec_uint.

Signature¶

def input_dec_uint_until n, dst, stop_byte @ loop, digit_lo, add_digit, digit, done { ... }

Defined in hex/input.fj — lines 101–118 (view on GitHub).

Complexity¶

Time: ~ nd(10@+39) (d = number of digits)
Space: ~ n(9@+132)

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

Requires init¶

The following must be initialised before this macro is invoked:

hex.init

Source¶

Click to view the macro body

def input_dec_uint_until n, dst, stop_byte @ loop, digit_lo, add_digit, digit, done {
    .zero n, dst
    .zero n, digit
  loop:
    .input stop_byte
    .if_flags stop_byte+dw, 1<<3, done, digit_lo     // high nibble != 3 -> not '0'-'9' -> stop
  digit_lo:
    .if_flags stop_byte, (1<<10)-1, done, add_digit  // low nibble not 0..9 -> not a digit -> stop
  add_digit:
    .mul10 n, dst
    .zero digit
    .xor digit, stop_byte
    .add n, dst, digit
    ;loop

  digit: hex.vec n
  done:
}

Depends on¶

Used by¶

hex.input_dec_uint

Example uses¶

hex.input_dec_uint in hex/input.fj

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