8.4.2 Constructs

The following C declarations and statements are recognized:

defines

defines are changed into pascal constants if they are simple defines. macros are changed - wherever possible to functions; however the arguments are all integers, so these must be changed manually. Simple expressions in define staments are recognized, as are most arithmetic operators: addition, substraction, multiplication, division, logical operators, comparision operators, shift operators. The C construct ( A ? B : C) is also recognized and translated to a pascal construct with an IF statement (this is buggy, however).

preprocessor statements

the conditional preprocessing commands are recognized and translated into equivalent pascal compiler directives. The special

#ifdef __cplusplus

is also recognized and removed.

typedef

A typedef statement is changed into a pascal type statement. The following basic types are recognized:

• char changed to char.
• float changed to real (=double in Free Pascal).
• int changed to longint.
• long changed to longint.
• long int changed to longint.
• short changed to integer.
• unsigned changed to cardinal.
• unsigned char changed to byte.
• unsigned int changed to cardinal.
• unsigned long int changed to cardinal.
• unsigned short changed to word.
• void ignored.

These types are also changed if they appear in the arguments of a function or procedure.

functions and procedures

functions and procedures are translated as well; pointer types may be changed to call by reference arguments (using the var argument) by using the -p command line argument. functions that have a variable number of arguments are changed to a function with an array of const argument.

specifiers

The extern specifier is recognized; however it is ignored. the packed specifier is also recognised and changed with the PACKRECORDS directive. The const specifier is also recognized, but is ignored.

modifiers

If the -w option is specified, then the following modifiers are recognized:

STDCALL   CDECL   CALLBACK   PASCAL   WINAPI   APIENTRY   WINGDIAPI

as defined in the win32 headers. If additionally the -x option is specified then the

SYS_TRAP

specifier is also recognized.

enums

enum constructs are changed into enumeration types; bear in mind that in C enumeration types can have values assigned to them; Free Pascal also allows this to a certain degree. If you know that values are assigned to enums, it is best to use the -e option to change the enus to a series of integer constants.

unions

unions are changed to variant records.

structs

are changed to pascal records, with C packing.