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//PCI_NB_BAR =6
typedef struct _PLDA_RESOURCE_ITEMS_INFO
{
UINT32 item; // ITEM_TYPE
UINT32 fNotSharable;
UINT32 dwOptions;
UINT32 barIndex;
union
{
struct
{ // ITEM_MEMORY
UINT64 ulPhysicalAddr[PCI_NB_BAR]; // UINT32 ulPhysicalAddr[PCI_NB_BAR]; // Physical address on card.
UINT32 ulBytes[PCI_NB_BAR]; // Address range.
UCHAR *ulTransAddr[PCI_NB_BAR]; // Returns the address to pass on to transfer commands.
UINT64 ulUserDirectAddr[PCI_NB_BAR]; // Returns the address for direct user read/write.
UINT32 ulBar[PCI_NB_BAR]; // Base Address Register number of PCI card.
} Mem;
struct
{ // ITEM_IO
UCHAR *ucAddr; // Beginning of io address.
UINT32 ulBytes; // IO range.
UINT32 ulBar; // Base Address Register number of PCI card.
} IO;
struct
{ // ITEM_INTERRUPT
UINT32 ulInterrupt; // Number of interrupt to install.
UINT32 ulOptions; // Interrupt options. For level sensitive interrupts set to: INTERRUPT_LEVEL_SENSITIVE.
UINT32 hInterrupt; // Returns the handle of the interrupt installed.
}Int;
}Resources;
}PLDA_RESOURCE_ITEMS_INFO,*PPLDA_RESOURCE_ITEMS_INFO;
#include <stdio.h>
#define field_offset(s,f) (int)(&(((struct s *)(0))->f))
struct AD { int a; char b[13]; double c;};
#pragma pack(push)
#pragma pack(1)
struct A1 { int a; char b[13]; double c;};
#pragma pack(2)
struct A2 { int a; char b[13]; double c;};
#pragma pack(4)
struct A4 { int a; char b[13]; double c;};
#pragma pack(8)
struct A8 { int a; char b[13]; double c;};
#pragma pack(16)
struct A16 { int a; char b[13]; double c;};
#pragma pack(pop)
int main() {
printf("AD.a %d\n",field_offset(AD,a));
printf("AD.b %d\n",field_offset(AD,b));
printf("AD.c %d\n",field_offset(AD,c));
printf("\n");
printf("A1.a %d\n",field_offset(A1,a));
printf("A1.b %d\n",field_offset(A1,b));
printf("A1.c %d\n",field_offset(A1,c));
printf("\n");
printf("A2.a %d\n",field_offset(A2,a));
printf("A2.b %d\n",field_offset(A2,b));
printf("A2.c %d\n",field_offset(A2,c));
printf("\n");
printf("A4.a %d\n",field_offset(A4,a));
printf("A4.b %d\n",field_offset(A4,b));
printf("A4.c %d\n",field_offset(A4,c));
printf("\n");
printf("A8.a %d\n",field_offset(A8,a));
printf("A8.b %d\n",field_offset(A8,b));
printf("A8.c %d\n",field_offset(A8,c));
printf("\n");
printf("A16.a %d\n",field_offset(A16,a));
printf("A16.b %d\n",field_offset(A16,b));
printf("A16.c %d\n",field_offset(A16,c));
printf("\n");
return 0;
}
//AD.a 0
//AD.b 4
//AD.c 24
//
//A1.a 0
//A1.b 4
//A1.c 17
//
//A2.a 0
//A2.b 4
//A2.c 18
//
//A4.a 0
//A4.b 4
//A4.c 20
//
//A8.a 0
//A8.b 4
//A8.c 24
//
//A16.a 0
//A16.b 4
//A16.c 24
//
//