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go/misc/cgo/stdio/align.go

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package stdio
/*
#include <stdio.h>
typedef unsigned char Uint8;
typedef unsigned short Uint16;
typedef enum {
MOD1 = 0x0000,
MODX = 0x8000
} SDLMod;
typedef enum {
A = 1,
B = 322,
SDLK_LAST
} SDLKey;
typedef struct SDL_keysym {
Uint8 scancode;
SDLKey sym;
SDLMod mod;
Uint16 unicode;
} SDL_keysym;
typedef struct SDL_KeyboardEvent {
Uint8 typ;
Uint8 which;
Uint8 state;
SDL_keysym keysym;
} SDL_KeyboardEvent;
void makeEvent(SDL_KeyboardEvent *event) {
unsigned char *p;
int i;
p = (unsigned char*)event;
for (i=0; i<sizeof *event; i++) {
p[i] = i;
}
}
int same(SDL_KeyboardEvent* e, Uint8 typ, Uint8 which, Uint8 state, Uint8 scan, SDLKey sym, SDLMod mod, Uint16 uni) {
return e->typ == typ && e->which == which && e->state == state && e->keysym.scancode == scan && e->keysym.sym == sym && e->keysym.mod == mod && e->keysym.unicode == uni;
}
void cTest(SDL_KeyboardEvent *event) {
printf("C: %#x %#x %#x %#x %#x %#x %#x\n", event->typ, event->which, event->state,
event->keysym.scancode, event->keysym.sym, event->keysym.mod, event->keysym.unicode);
fflush(stdout);
}
*/
import "C"
import (
"fmt"
"syscall"
)
func TestAlign() {
if syscall.ARCH == "amd64" {
// alignment is known to be broken on amd64.
// http://code.google.com/p/go/issues/detail?id=609
return
}
var evt C.SDL_KeyboardEvent
C.makeEvent(&evt)
if C.same(&evt, evt.typ, evt.which, evt.state, evt.keysym.scancode, evt.keysym.sym, evt.keysym.mod, evt.keysym.unicode) == 0 {
fmt.Println("*** bad alignment")
C.cTest(&evt)
fmt.Printf("Go: %#x %#x %#x %#x %#x %#x %#x\n",
evt.typ, evt.which, evt.state, evt.keysym.scancode,
evt.keysym.sym, evt.keysym.mod, evt.keysym.unicode)
fmt.Println(evt)
}
}