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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, "digit" |
| .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 > |
| .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' -> 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 |
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