Interface structure to pass the parameter list to EDGXHINT

In C/C++ programming language, a struct is used to pass the parameter list to EDGXHINT. Sample code for this purpose is shown in Figure 1. In this sample, the interface structure itself is defined in t_interface. Additional structs are used to map the command buffer (t_comm) and the output buffer (t_outp).

Figure 1. C/C++ sample code for an interface struct

typedef struct t_comm               // to map the output buffer
{
    short com_length;               // length of the command
    char  commandBuffer[255]; // storage to hold the command
};
t_comm  commandStrct;               // variable of type t_comm
t_comm* commPtr;                    // pointer to t_comm

typedef struct t_outph              // to map the command buffer header
{
    long  out_length;               // length of the output buffer
    long  out_needed;               // output buffer length needed
    long  out_used;                 // output buffer length used
};
t_outph  outputHeaderStrct;         // variable of type t_outph

typedef struct t_outp               // to map the output buffer
{
    t_outph header;                 // output buffer header
    char  outputBuffer[80000]; // storage to hold the output
};
t_outp  outputStrct;                // variable of type t_outp
t_outp* outputPtr;                  // pointer to t_outp

typedef struct t_interface          // to map the interface structure
{
    long     function;              // function code
    t_comm*  command_ptr;           // pointer to command buffer
    t_outp*  outputBuf_ptr;         // pointer to output buffer
    char*    messageBuf_ptr1;       // pointer to first message buffer
    char*    messageBuf_ptr2;       // pointer to second message buffer
    long     messageCount;          // number of messages returned
    void*    addr_XAPI;             // address of module EDGXAPI
    void*    addr_MTAB;             // address of module EDGMTAB
    void*    addr_CMSG;             // address of module EDGCMSG
    long     token;                 // token to identify the request
    long     returncode;            // API return code
    long     reasoncode;            // API reason code
};
t_interface interStruct;            // variable of type t_interface
t_interface* pI;                    // pointer to t_interface