Re: Fixed-Length strings vs. NUL-terminated strings

Use a for() loop from position n to start of field until a non space is found.

Eg:

Field read is 120 bytes with blanks added to end of field.
For(i = 119; i > 0; i--) {
   New_string[i] = (read_field[i] != ' ') ? '\0' : read_field[i];
   If(read_field[i] != ' ')
      break;
  }

If the field is NULL terminated when written then this would not be necessary, just use strcpy(new_field,read_field);

There  are no API's or anything else to look for the length of a character array to a string automatically, you can using the above come up with one of your own.
Another option would be to have a separate field that stores the string length when written.

Chris...

-----Original Message-----
From: C400-L <[email protected]> On Behalf Of Patrik Schindler
Sent: June 4, 2021 8:02 AM
To: Bare Metal Programming IBM i (AS/400 and iSeries) <[email protected]>
Subject: [C400-L] Fixed-Length strings vs. NUL-terminated strings

Hello,

reading from a database table (declared with fixed length strings for easier handling in RPG for green screen use) with the _R API calls returns fixed length strings, filled with spaces until the space is exhausted.

Do I need to come up with a hand crafted function to "convert" these to C-style strings, or does IBM i provide an API for achieving this? By "conversion" I want to point out that I don't care if that function just places a NUL on the proper position's original buffer, or the string gets just copied and the copy is treated accordingly.

My Google searches yield a lot of unrelated information, because the question seems rather generic. The IBM API finder list yielded no usable results by searches for string, fixed or NUL.

Thanks for your hints!

:wq! PoC

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