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Know Your Source Members

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IBM's standard practice is to write source members in different files, depending on the type of source you're writing. For a CL program, the source member should be in QCLSRC; if you're defining a logical file, the A-specs must be placed in QDDSSRC.

Even though this approach is well organized and may have its advantages, it does present a problem: you can inadvertently give the same name to two different members that will try to generate two objects of the same name. Since this is not permitted, the second object usually replaces the first -- and chances are you won't find out until something malfunctions.

To give you an example, suppose that the Shipping department has asked you to create a report for them, say, of return authorizations. Because you're a conscientious programmer, you begin by writing member LSTRTNAUT in QCMDSRC, for the command. Then you write member LSTRTNAUT in QCLSRC, which will be the command processing program. This CL program runs OPNQRYF to extract the information and subsequently has to call an RPG program to print the information it needs. So you write member LSTRTNAUT in QRPGSRC.

Now you compile LSTRTNAUT from QCMDSRC, LSTRTNAUT from QCLSRC, and LSTRTNAUT from QRPGSRC. This produces one command and one RPG program. The CL program was created too, but because you later created the RPG program (which has the same name), the CL program is replaced.

Good naming standards will prevent this from happening. In general, you don't want to give the same name to two source members, even if they're in different source physical files.

The problem is compounded if you have to support several libraries. You wouldn't want to end up having several objects (in different libraries) with the same name, since you would then be forced to qualify names with hard-coded library names. Using the library list is always desirable, but the library list support will stop searching at the first hit.

Enter LSTSRCMBR

Command List Source Members (LSTSRCMBR) can help you tremendously in eliminating duplicate member names. LSTSRCMBR will print a report listing all the members contained in up to 50 source files, ordered in member name sequence for your convenience.

1 shows what the report looks like. As 2a shows, the command definition is simple indeed: the single parameter SRCF accepts anywhere between 1 and 50 qualified source file names.

Figure 1 shows what the report looks like. As Figure 2a shows, the command definition is simple indeed: the single parameter SRCF accepts anywhere between 1 and 50 qualified source file names.

The command processing program (2b) is a CL program. All the program really does is to run DSPFD for each source file selected; the list of members is added to the same outfile each time. OPNQRYF sorts the outfile, and autoreport program SRC004RT (2c) prints the list.

The command processing program (Figure 2b) is a CL program. All the program really does is to run DSPFD for each source file selected; the list of members is added to the same outfile each time. OPNQRYF sorts the outfile, and autoreport program SRC004RT (Figure 2c) prints the list.


Know Your Source Members

Figure 1 Sample printed report (see issue)


Know Your Source Members

Figure 2A Command LSTSRCMBR

 LSTSRCMBR: CMD PROMPT('List Source Members') PARM KWD(SRCF) TYPE(Q1) MIN(1) MAX(50) + PROMPT('Source file(s)') Q1: QUAL TYPE(*SNAME) LEN(10) MIN(1) QUAL TYPE(*SNAME) LEN(10) DFT(*LIBL) + SPCVAL((*LIBL)) PROMPT('Library') 
Know Your Source Members

Figure 2B CL program SRC004CL

 SRC004CL: + PGM PARM(&SRCFILES) DCL VAR(&COUNTER) TYPE(*DEC) LEN(5 0) DCL VAR(&LIB) TYPE(*CHAR) LEN(10) DCL VAR(&OFFSET) TYPE(*DEC) LEN(3 0) DCL VAR(&SRCF) TYPE(*CHAR) LEN(10) DCL VAR(&SRCFILES) TYPE(*CHAR) LEN(1002) DCL VAR(&TWO_BYTES) TYPE(*CHAR) LEN(2) CHGVAR VAR(&TWO_BYTES) VALUE(%SST(&SRCFILES 1 2)) CVTBINDEC FROMBIN(&TWO_BYTES) TODEC(&COUNTER) CHGVAR VAR(&OFFSET) VALUE(3) DLTF FILE(QTEMP/QAFDMBRL) MONMSG MSGID(CPF0000) LOOP: + CHGVAR VAR(&SRCF) VALUE(%SST(&SRCFILES &OFFSET 10)) CHGVAR VAR(&OFFSET) VALUE(&OFFSET + 10) CHGVAR VAR(&LIB) VALUE(%SST(&SRCFILES &OFFSET 10)) CHGVAR VAR(&OFFSET) VALUE(&OFFSET + 10) DSPFD FILE(&LIB/&SRCF) TYPE(*MBRLIST) OUTPUT(*OUTFILE) + OUTFILE(QTEMP/QAFDMBRL) OUTMBR(*FIRST *ADD) CHGVAR VAR(&COUNTER) VALUE(&COUNTER - 1) IF COND(&COUNTER *GT 0) THEN(GOTO CMDLBL(LOOP)) OVRDBF FILE(QAFDMBRL) TOFILE(QTEMP/QAFDMBRL) SHARE(*YES) OPNQRYF FILE((QTEMP/QAFDMBRL)) QRYSLT(*ALL) KEYFLD((MLNAME) + (MLLIB) (MLFILE)) CALL PGM(SRC004RT) CLOF OPNID(QAFDMBRL) DLTOVR FILE(*ALL) DLTF FILE(QTEMP/QAFDMBRL) ENDPGM 
Know Your Source Members

Figure 2C RPG Auto Report program SRC004RT

 FQAFDMBRLIP E K DISK FQSYSPRT O F 132 OA PRINTER * C MOVE MLNAME MBRNAM 10 C MOVE MLSEU2 SRCTYP 10 C MOVE *BLANK QSRCF 21 C MLLIB CAT '/':0 QSRCF C QSRCF CAT MLFILE:0 QSRCF C MOVE MLMTXT MBRTXT 50 C Z-ADDMLNRCD NBRRCD 60 C MOVE MLCDAT CRTDAT 6 C MOVE MLCHGD CHGDAT 6 * OQSYSPRT H 304 *AUTO O 'LIST SOURCE MEMBERS' OQSYSPRT D 1 *AUTO O MBRNAM 'Member Name' O SRCTYP 'Source Type' O QSRCF 'Source File' O MBRTXT 'Member Text' O NBRRCD1 'Nbr Records' O CRTDAT 'Created' O CHGDAT 'Changed' 
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