Pascal to C Migration

Pascal has been used for decades in education, engineering, desktop software, and business applications. Zwiegnet provides Pascal to C migration services to help organizations preserve valuable legacy logic while improving portability, integration, and maintainability across Linux, Unix, and modern platforms.

Turbo Pascal, ISO Pascal, and Object Pascal dialects differ in their language features and runtime dependencies. We assess the actual source and build environment before choosing a practical migration approach.

Our migration process includes:

• Source and Build Assessment – Inventory Pascal units, compiler-specific extensions, project files, libraries, build scripts, and runtime dependencies.
• Language Feature Mapping – Review records, sets, enumerations, pointers, strings, file I/O, procedures, and dialect-specific features that need explicit C equivalents.
• Object Pascal Review – Identify classes, properties, exceptions, and framework dependencies when migrating Object Pascal applications.
• Data and File Compatibility – Document record layouts, binary files, text formats, and serialization behavior to avoid breaking existing data.
• Incremental Conversion – Prioritize reusable algorithms and business logic, keeping module boundaries clear as components move to C.
• Linux and Unix Porting – Establish reproducible builds with GCC or Clang and identify operating-system-specific calls that need replacement.
• Regression Testing – Compare outputs, file operations, numeric behavior, and edge cases against the original program.
• Performance and Maintainability Review – Profile important routines and simplify the resulting code without changing required behavior.
• Documentation and Handoff – Provide build instructions, architecture notes, and maintenance guidance for the migrated codebase.

Depending on the source dialect and application architecture, a staged migration of core routines may be safer than attempting a wholesale rewrite in one step.

Located between Madison and Milwaukee, Wisconsin since 2009 — direct, personal service focused on practical legacy modernization.