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Can't change string containing ampersand

 
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misi01
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Location: Stockholm, Sweden
PostPosted: Mon Aug 21, 2017 8:48 am    Post subject: Can't change string containing ampersand Reply with quote
I have a file containing the following line

Quote:

// PARM='BMP,VNONQ81,VNONQ81,,,N00000,,1,&CKPTID,0,100,,,IMSP,,,,,,0'

My Rexx procedure looks like this
Code:

bmp_string = "PARM='BMP,"                                       
                                                               
"find '"bmp_string"' first"                                     
                                                               
do while rc = 0                                                 
                                                               
  rc = get_current_line()                                       
  if pos(',&',line) <> 0 then                                   
    do                                                         
      /* Found what is probably a parm for the checkpoint ID.   
         Remove it */                                           
      parse var line first_part ',&' ckptid ',' last_part       
      old_str = ',&'ckptid; new_str = ','                       
      "change '"old_str"'" "'"new_str"' .zcsr .zcsr"           
    end                                                         
  "find '"bmp_string"' next"                                   
                                                               
end             
                                               

The manual (https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.f54sg00/edit.htm) talks about the exception caused by the first character being an ampersand. The thing is, my string is starting with a comma. When I get to the change line, I'm seeing the following
Quote:

461 *-* "change '"old_str"'" "'"new_str"' .zcsr .zcsr"
>>> "change ',&CKPTID' ',' .zcsr .zcsr"
+++ RC(4) +++

If I change the code above to the following:-
Code:

    460 *-*     old_str = ',='ckptid                               
                                                                   
        *-*     new_str = ','                                     
                                                                   
    461 *-*     "change p'"old_str"'" "'"new_str"' .zcsr .zcsr"   
        >>>       "change p',=CKPTID' ',' .zcsr .zcsr"             

then all works well.

Can anyone suggest an explanation ?
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Michael
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kolusu
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PostPosted: Mon Aug 21, 2017 11:30 am    Post subject: Reply with quote
misi01,

The reason you did not find the & is because ISPF/ISREDIT evaluates/substitutes any ISPF variable.

You can avoid the scan by simply turning it off


Code:

ISREDIT "SCAN OFF"
ISREDIT "change '"old_str"'" "'"new_str"' .zcsr .zcsr"     
ISREDIT "SCAN ON"


Or as you figured you can use Picture string to do the change.
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Kolusu
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misi01
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Location: Stockholm, Sweden
PostPosted: Thu Aug 24, 2017 6:57 am    Post subject: Reply with quote
Thanks Kolusu. Would never have figured that out.
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Michael
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misi01
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PostPosted: Tue Sep 12, 2017 6:51 am    Post subject: Just thought I'd append a caveat to Kolusu's suggestion Reply with quote
I found the following http://Mcmillan_The_Moron.com
Look for the entry appended Thu May 26, 2011 1:39 am.

Iwas trying the following thta Kolusu suggested

Code:

new_pref = '&SYSUID..'
"SCAN OFF"                                       
"change '"old_pref"'" "'"new_pref"' .zcsr .zcsr"
"SCAN ON"                                     

but this was failing and producing the following results (note how the first qualifier has simply "disappeared")
Code:

//SYSUT2   DD  DSN=.D17105G1.BATCH(+1),                           
//             DISP=(,CATLG,DELETE),                               
//             SPACE=(CYL,(175,15)),                               


After I changed he first line above to (note the double ampersands)
Code:

new_pref = '&&SYSUID..'

then everything worked fine.
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kolusu
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PostPosted: Tue Sep 12, 2017 10:56 am    Post subject: Reply with quote
misi01,


Please DO NOT ever link that moron's site. You are free to search for answers where ever you like but never link that site again. Failing to comply would result in deleting your id

Thank You

Kolusu
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