HP 3000 Manuals HP 3000 Manuals
Chapter 3 Calling Other Languages and MPE/iX Intrinsics
This chapter describes how to call routines written in other HP languages
from HP C programs. It also describes how to call MPE/iX system
intrinsics from HP C programs.
Invoking routines or accessing data defined or declared in another
programming language from HP C can be tricky. Here are some common
problems:
* Mismatched data types for parameters and return values.
* Different language storage layouts for aggregates (arrays,
records, variants, structures, unions, equivalences, and commons).
* Different formats for strings among HP C, HP Pascal, and HP
FORTRAN 77.
* Different language values for true, false, eof, and nil.
* Different language bit level justification of objects smaller than
32 bits (right-justification or most significant bit or byte last
versus left-justification or most significant bit or byte first).
The topics listed above are described in detail in this chapter. For
additional information, refer to Chapter 2, "Storage and Alignment
Comparisons," in this manual. Also, the following manuals have chapters
on calling other languages:
* HP Pascal/HP-UX Programmer's Guide.
* HP Pascal/iX Programmer's Guide.
* HP FORTRAN/9000 Programmer's Guide.
* HP FORTRAN 77/iX Programmer's Guide.
* COBOL/HP-UX Operating Manual.
* HP COBOL II/XL Programmer's Guide.