This RPG program will read your file and remove any invalid characters. If invalid characters are found you can change the value to blanks or zeroes depending on your field type. Array ARY is the total length of the record format.
FPRMCP UF E DISK RENAME(RPRMCP:CPFIX) DARY S 768 DIM(1) C SETOFF 70 C *IN70 DOWEQ '0' C READ CPFIX 70 C 70 LEAVE C MOVEA CPFIX ARY C Z-ADD 0 IN 3 0 C 1 DO 768 IN C ARY(IN) IFLT X'40' C MOVE *BLANKS ARY(IN) C ENDIF C ENDDO C MOVEA ARY CPFIX C UPDATE CPFIX C CLEAR ARY C ENDDO C SETON LR
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