What? RPG IV a Better C Than C?

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Since the introduction of ILE with OS/400 V3R1, RPG has been gaining ground on C in flexibility of algorithmic expression, ability to interoperate in a mixed-language setting, and performance. With each software-focused release, RPG can been seen as at least running neck-and-neck with C. In some cases, RPG even surpasses C in language-enhancing features:

  • Separation of source compilation and module binding steps (providing linkage to other ILE languages)
  • Addition of built-in functions (BIFs), which provide continued language extension
  • Introduction of smaller bindable units with subprocedures (not limited to just program-level calls)
  • Comprehensive pointer manipulation support (two types of pointers: a generic data pointer and a procedure pointer)
  • Dynamic (runtime) memory allocation on free store
  • Data type support for short, regular, and long integers, both signed and unsigned; floats and doubles; pointers; and Java objects
  • Bit manipulation with XOR, AND, and OR BIFs (V5R2)
  • Abstract Data Type (ADT) support--like structs in C
  • Arguments passed to functions either by reference (lacking from C) or by value
  • Free-form language expression for program logic (calc specs), but data specifications remain fixed (which is fine since data must be structured to be usable)
  • Better interoperability with Java--raw Java Native Interface (JNI) required for C
  • Conditional compiler directives
  • Thread safety (same as C)
  • Language-dependent or -independent error handling

Those are just a few of the advantages ILE RPG IV (as of V5R2) added to the programmer's arsenal to combat the fluid nature of computing requirements in today's environment. And you must not forget that anything C can bind with, RPG can bind with as well. For example, before RPG had the capability to convert character data to numeric, you could use C's atoi() and atof() functions to accomplish that objective. On a recent project, I avoided completely rewriting a file editing application (a DBU-like utility) by replacing RPG I/O operations with equivalent C I/O functions. This was required because RPG does not provide the runtime null field support for program-described files (which is what you must do to achieve dynamic file maintenance in RPG) that can be accomplished in C. While this was not a trivial task, it was not difficult either. (Watch for a future MCMagOnline article entitled "How Could Life Be Better?" for an example of this.)

A Better View

By way of example, Figure 1 shows a functional code snippet that uses C's printf(), prototyped in [B], where you might have previously used the DSPLY opcode to list address information from two variables (var1 and var2 shown at [D]) created from the ADT address [A].

     h dftactgrp(*no) actgrp(*new) datfmt(*usa) bnddir('QC2LE') 

 [A] d address         ds
     d   name                        25a   inz('No Name')
     d   add1                        30a   inz('No address 1')
     d   add2                        30a   inz('No address 2')
     d   city                        15a   inz('No city')
     d   state                        2a   inz('NA')
     d   zip                         10u 0
     d   dob                           d

 [B] d printf          pr                  extproc('printf')
     d                                 *   value options(*string)
     d                                 *   value options(*string:*nopass)
     d                                 *   value options(*string:*nopass)
     d                               10u 0 value options(*nopass)

     d printf2         pr                  extproc('printf')
     d                                 *   value options(*string)
     d                               10u 0 value options(*nopass)

     d separator       s             30a   inz('* * * * * * * * * * * *')
 [C] d newline         c                   x'25'
     d index           s             10i 0
     d total_addresses...
     d                 s             10i 0

      *----- Applied versions of ADT address
 [D] d var1            ds                  likeds(address)
     d var2            ds                  likeds(address)

       monitor; = 'John Doe';
       var1.dob = %date('03/23/1977':*usa);
       var1.add1 = 'c/o Jane Doe';
       var1.add2 = 'Apt. 225'; = 'Somewhere';
       var1.state= 'TX'; = 73533;
       total_addresses = total_addresses + 1; = 'Jane Doe';
       var2.dob = %date('12/09/1977':*usa);
       var2.add1 = '23 N. Lancaster';

       // following statement causes string error and branch to on-error
       // program resumes upon return with statement following the statement
       // which caused on-error to be called.

       %subst(var2.add2:index:30) = 'String index error';
       on-error 00100 : 00121;  // Traps string error where it occurs
                                // on-error here allows processing to
                                // continue = 'Somewhere Else';
       var2.state= 'TX'; = 77381;
       total_addresses = total_addresses + 1;

  [E]  printf('Name:    %s' + newline;
       printf('Address: %s' + newline :var1.add1);
       printf('Address: %s' + newline :var1.add2);
       printf('City:    %s  State: %s  Zip: %d'
                        + newline
       printf('Date of birth: %s' + newline :%char(var1.dob));

       printf('%s' + newline :separator);

       printf('Name:    %s' + newline;
       printf('Address: %s' + newline :var2.add1);
       printf('City:    %s  State: %s  Zip: %d'
                        + newline
       printf('Date of birth: %s' + newline :%char(var2.dob));

       printf('%s' + newline :separator);

       if ( var1.state = var2.state );
           printf('%s' + newline :'Hey, these guys +
                                   live in the same state!');

 [F]   printf2('Total addresses listed: %d' + newline :total_addresses);

       on-error *all;   // This is like MONMSG CPF0000 with branch to
                        // end
           printf('%s' + newline :'Fatal error occurred. +
                                   Processing haulted!');

       *inlr = *on;

Figure 1: Use C's printf() where you might have previously used the DSPLY opcode.

Yet printf() is a better solution because you can format the output better than with DSPLY, and you can scroll to see previous output produced from using the printf statement. The printf function is defined in C as a variable-arguments function, which is indicated by the ellipses (...) shown in the following C prototype:

int      printf(const  char *, ...);

However, since RPG IV cannot define such a function, you can emulate this functionality by prototyping multiple versions of the printf function, all bound to the same C printf binary but with different prototype names. When creating your own prototypes for printf required by your application, the only requirement is that the first argument be defined as a pointer to a null-terminated string (referred as the format-string argument, i.e., containing format conversion identifiers like %s,%c,%d,%f, etc.). A list of these format conversion identifiers are shown in a table in the printf() documentation in the ILE C/C++ Run-Time Library Reference). Every argument following the first can be any valid data type defined in C (e.g., integer, float, double, etc.). This will accommodate most requirements for debugging your applications.

An example of this is shown in [B] of Figure 1 where the printf2 function takes an integer argument after the initial string argument to print the total number of addresses defined from the ADT address. This calculation immediately follows the ZIP code initialization for each address variable and is printed as the last and only output line printed by the printf2 prototyped variation of the printf C function as shown in [F] of Figure 1.

The Great Escape

The C shell output window is invoked to display the results of printf when the activation group is set to *new. You should be aware that since RPG does not invoke the C precompiler, escape sequence characters like ' ' (new line or linefeed), ' ' (tab), etc. are not translated to their equivalent hex values. (For a complete list of escape sequence characters, refer to Escape Sequences and Appendix A-AS/400 Control Characters in the ILE C Language Reference.) For this reason, the newline standalone variable shown in [C] was defined with a value of x'25' (x'15' if using *IFSIO) to enable a linefeed after outputting the results. You will need to do the same for any other escape sequence characters you wish to embed in the output. This is a small price to pay for the superior output achieved using printf(). Displaying the data in the variables (var1, var2) is a simple matter of using the identical qualifying dot (.) notation used in C to access structure data members as shown in [E] of Figure 1. The "%s" notation in the formatted output string is used to print the string data of and is a standard C formatter character.

Like DSPLY, the printf function can be handy for debugging your applications.

Note that even though Figure 1 presents the use of printf() in free-form expressions, you can also use it in fixed-form expressions with a CALLP. Note the similarities when all forms of the printf() are put together, as in Figure 2:

Fixed Form: Callp(e) printf('City: %s State: %s Zip: %d'
+ newline

Free Form: printf('City: %s State: %s Zip: %d'
+ newline

C equivalent: printf("City: %s State: %s Zip: %d "

Figure 2: You can use printf() in both free-form and fixed-form expressions.

Watch the Gotchas!

There are some noteworthy "gotchas" when mixing C with RPG:

  • A single character returned from a C function will be promoted (also called "widening") to an integer of 4 bytes versus the 1 byte expected. The value will be right-justified to appear in the last byte of the integer.
  • When a C function calls an RPG IV subprocedure that contains the %parms BIF (that normally seems to work fine when called by another RPG subprocedure), the value returned from that BIF is not what the programmer expects--the number of arguments passed in. The result is always -1 (meaning an error occurred) because RPG always passes a minimal operational descriptor to called functions, while languages like C do not by default, unless specifically directed to. Since the %parms BIF cannot determine the number of arguments passed to the RPGIV subprocedure, use the ILE CEE API CEETSTA instead to get the number of arguments passed to an RPG IV subprocedure when called from C (read the requirements and limitations of this API carefully; they will affect the manner in which arguments are passed and the order of argument definition in the called function).
  • Null-terminate strings passed to C functions and remove the null-termination character when a string is returned with the %str BIF.
  • Use the ALIGN keyword to align structures (or a pointer to a C structure) passed to a C function or returned when the _Packed keyword has been omitted from the structure definition (in the called C function) to ensure consistent boundary alignment between caller and called function.
  • Constant pointers (as in "char * const") are references (think of them as pointers to pointers) to pointer values, not the actual pointer value themselves. As such, they must be de-referenced before used as a based on value for a standalone variable or data structure. (See an example of how to do this in RPG IV in the upcoming article "How Could Life Be Better?")


Some of the Best Tools Are Found in Unlikely Places

If you are an RPG programmer in a shop with C programmers, you have undoubtedly had extensive debates regarding the advantages of C vs. RPG and concluded that it comes down to which language you are most comfortable with and what your corporate strategy is regarding the portability of source. However, if portability is not an issue and you need some features in the standard C library, they come free with OS/400 and you don't need the C compiler to use them. Yet to take advantage of this situation to its fullest benefit, it helps if you learn a few simple C basics to understand how to create the RPG prototypes you will need for the C functions you wish to use. (Unfortunately, IBM has not seen fit to include RPG prototypes in QSYSINC. I hope this changes in the future.) But note that as of V5R1, the C function prototypes previously available only with the licensing of the C language now have a new home in QSYSINC.

The more you use C functions in your daily application requirements, the more C you will learn by default. This could be advantageous if you later wish to learn C++ (or Java), another beautiful language (like RPG IV) that has also been dubbed "a better C than C."

Jim Barnes is a freelance writer and independent consultant working in Houston, Texas. Jim can be reached at This email address is being protected from spambots. You need JavaScript enabled to view it..

References and Related Materials

ILE C for AS/400 Language Reference (SC09-2711-00)

ILE C/C++ Run-Time Library Reference (SC09-2715-00)


Jim D. Barnes is a freelance writer and Systems Engineer in Plano, Texas.



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    • The basics of Git and tools to help those new to it
    • Using as a pre-built development environment



  • Inside the Integrated File System (IFS)

    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.


  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.



  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption



  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.



  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access




  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.


  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.



  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.



  • Node Webinar Series Pt. 1: The World of Node.js on IBM i

    SB Profound WC GenericHave you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.
    Part 1 will teach you what Node.js is, why it's a great option for IBM i shops, and how to take advantage of the ecosystem surrounding Node.
    In addition to background information, our Director of Product Development Scott Klement will demonstrate applications that take advantage of the Node Package Manager (npm).
    Watch Now.

  • The Biggest Mistakes in IBM i Security

    SB Profound WC Generic The Biggest Mistakes in IBM i Security
    Here’s the harsh reality: cybersecurity pros have to get their jobs right every single day, while an attacker only has to succeed once to do incredible damage.
    Whether that’s thousands of exposed records, millions of dollars in fines and legal fees, or diminished share value, it’s easy to judge organizations that fall victim. IBM i enjoys an enviable reputation for security, but no system is impervious to mistakes.
    Join this webinar to learn about the biggest errors made when securing a Power Systems server.
    This knowledge is critical for ensuring integrity of your application data and preventing you from becoming the next Equifax. It’s also essential for complying with all formal regulations, including SOX, PCI, GDPR, and HIPAA
    Watch Now.

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.