The mi_fp_setretscale() function

The mi_fp_setretscale() accessor function sets the scale of a return value of a user-defined function in its associated MI_FPARAM structure.

Syntax

void mi_fp_setretscale(fparam_ptr, ret_pos, ret_scale)
   MI_FPARAM *fparam_ptr;
   mi_integer ret_pos;
   mi_integer ret_scale;
fparam_ptr
A pointer to the associated MI_FPARAM structure.
ret_pos
The index position into the return-scale array for the return value whose scale you want to set. For C user-defined functions, the only valid value is 0.
ret_scale
The scale, in number of digits, to set for the ret_pos+1 return value.
Valid in client LIBMI application? Valid in user-defined routine?
Yes Yes

Usage

The mi_fp_setretscale() function sets the scale of the function return value at position ret_pos in the MI_FPARAM structure that fparam_ptr references.

The scale is an attribute of the return-value data type. The meaning of the scale depends on the associated data type, as the following list shows.
Data type
Meaning of scale
DECIMAL (fixed-point), MONEY
The number of digits to the right of the decimal point
DECIMAL (floating-point)
The value 255
DATETIME, INTERVAL
The encoded integer value for the end qualifier of the data type; end_qual in the qualifier:

start_qual TO end_qual

The MI_FPARAM structure stores information about the scale of function return values in the zero-based return-scale array.

For more information about return-value information in an MI_FPARAM structure or about the precision of a fixed-point data type, see the Informix® DataBlade® API Programmer's Guide.

To set information for the nth return value, use a ret_pos value of n-1. For example, the following call to mi_fp_setretscale() sets the scale to 4 for the first return value of the my_func() UDR, with which fparam1 is associated: 
mi_integer my_func(..., fparam1)
   ...
   MI_FPARAM *fparam1;
{
   ...
   mi_fp_setretscale(fparam1, 0, 4);
Important: C user-defined functions always have only one return value.

Return values

None.