dbDefs.h File Reference

Miscellaneous macro definitions. More...

#include <stddef.h>

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Macros
#define	TRUE   1
#define	FALSE   0
#define	LOCAL   static
	Deprecated synonym for static.
#define	NELEMENTS(array)   (sizeof (array) / sizeof ((array) [0]))
	Number of elements in array.
#define	OFFSET(structure, member)   offsetof(structure, member)
	Deprecated synonym for offsetof.
#define	CONTAINER(ptr, structure, member)   ((structure*)((char*)(ptr) - offsetof(structure, member)))
	Find parent object from a member pointer. More...
#define	PVNAME_STRINGSZ   61
	Size of a record name including the nil terminator.
#define	PVNAME_SZ   (PVNAME_STRINGSZ - 1)
	Size of a record name without the nil terminator.
#define	PVLINK_STRINGSZ   1024
	Buffer size for the string representation of a DBF_*LINK field.
#define	DB_MAX_CHOICES   30
	dbAccess enums/menus can have up to this many choices

Detailed Description

Author

Marty Kraimer

This file defines several miscellaneous macros.

Definition in file dbDefs.h.

Macro Definition Documentation

#define CONTAINER	(		ptr,
			structure,
			member
	)		((structure*)((char*)(ptr) - offsetof(structure, member)))

Subtracts the byte offset of the member in the structure from the pointer to the member itself, giving a pointer to parent structure.

Parameters

ptr	Pointer to a member data field of a structure
structure	Type name of the parent structure
member	Field name of the data member

Returns

Pointer to the parent structure

Note

Both GCC and Clang will type-check this macro.

Definition at line 67 of file dbDefs.h.