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      <h1> words/digit.asm </h1>

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      <pre>
; ( c base -- number flag ) Numeric IO
; R( -- )
; convert character to number, set flag if successful
VE_DIGIT:
    .db $05, &quot;digit&quot;
    .dw VE_HEAD
    .set VE_HEAD = VE_DIGIT
XT_DIGIT:
    .dw DO_COLON
PFA_DIGIT:
    .dw XT_SWAP
    ; [char] 0 -
    .dw XT_DOLITERAL
    .dw $30 ; '0'
    .dw XT_MINUS

    ; dup 9 &gt;
    .dw XT_DUP
    .dw XT_DOLITERAL
    .dw 9
    .dw XT_GREATER
    .dw XT_DOCONDBRANCH
    .dw PFA_DIGIT1
    ; if
        ; we had a non-numeric character
        .dw XT_DOLITERAL
        .dw $df
        .dw XT_AND ; make uppercase

        .dw XT_DOLITERAL
        .dw 7
        .dw XT_MINUS ; finally 'a' -&gt; 10

        .dw XT_DUP
        .dw XT_DOLITERAL
        .dw 10
        .dw XT_LESS
        .dw XT_DOCONDBRANCH
        .dw PFA_DIGIT1
            ; invalid character
            .dw XT_DROP
            .dw XT_ZERO
            .dw XT_EXIT
PFA_DIGIT1:
    ; ( b n -- n f)
    ; compare with the limits:  less than base and and not negative
    .dw XT_SWAP
    .dw XT_OVER
    .dw XT_GREATER

    .dw XT_OVER
    .dw XT_LESSZERO
    .dw XT_EQUALZERO
    .dw XT_AND
    .dw XT_EXIT
</pre>

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