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On 04/01/2006, at 8:28 AM, brian wrote:
I want to make a procedure that operates on strings of (practically)arbitrary size, so I wrote it to accept a pointer and a 10u 0. I'll callit like p(%addr(string) : %size(string)). What I don't understand is how, inside the procedure, to make RPG understand that the pointer is a string pointer so that I can do %subst and all the other usual string operations on the argument.
Depends on what you mean by "string pointer".If you mean a pointer to a C-style null-terminated string then just prototype and use the C string functions. Or use the %STR function to copy the data to an RPG character variable.
If you mean an RPG_style character variable then you have to provide the compiler with a suitable view of whatever storage the pointer references. Use a based variable to accomplish this.
D procedureThatOperatesOnStringsOfPracticallyArbitrarySize... D PI D input * VALUE D length 10U 0 VALUE D inputView S 65535 BASED(input) The body of the procedure would operate on inputView.In all cases when you use an RPG character variable you are limited to 32K or 64K depending on compiler release so if your arbitrary strings are longer than this then you'll need to shift the variable over the data in 32K or 64K windows.
If your arbitrary length strings fit within the limits of an RPG character variable then it's probably easier to use a VARYING length character variable.
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