typedef struct link_s
{
	struct link_s *prev, *next;
} link_t;

void ClearLink (link_t *l);
void RemoveLink (link_t *l);
void InsertLinkBefore (link_t *l, link_t *before);
void InsertLinkAfter (link_t *l, link_t *after);

// (type *)STRUCT_FROM_LINK(link_t *link, type, member)
// ent = STRUCT_FROM_LINK(link,entity_t,order)
// FIXME: remove this mess!
#define STRUCT_FROM_LINK(l,t,m) ((t *)((uint8_t *)l - (uintptr_t)&(((t *)0)->m)))

//============================================================================

extern bool bigendien;

extern short (*BigShort) (short l);
extern short (*LittleShort) (short l);
extern int (*BigLong) (int l);
extern int (*LittleLong) (int l);
extern float (*BigFloat) (float l);
extern float (*LittleFloat) (float l);

//============================================================================

void MSG_WriteChar (buf_t *sb, int c);
void MSG_WriteByte (buf_t *sb, int c);
void MSG_WriteShort (buf_t *sb, int c);
void MSG_WriteLong (buf_t *sb, int c);
void MSG_WriteFloat (buf_t *sb, float f);
void MSG_WriteString (buf_t *sb, char *s);
void MSG_WriteCoord (buf_t *sb, float f);
void MSG_WriteAngle (buf_t *sb, float f);

extern int msg_readcount;
extern bool msg_badread; // set if a read goes beyond end of message

void MSG_BeginReading (void);
int MSG_ReadChar (void);
int MSG_ReadByte (void);
int MSG_ReadShort (void);
int MSG_ReadLong (void);
float MSG_ReadFloat (void);
char *MSG_ReadString (void);

float MSG_ReadCoord (void);
float MSG_ReadAngle (void);

//============================================================================

extern char com_token[1024];
extern bool com_eof;

char *COM_Parse (char *data);

extern int com_argc;
extern char **com_argv;

int COM_CheckParm (char *parm);
void COM_Init (char *path);
void COM_InitArgv (int argc, char **argv);

char *COM_SkipPath (char *pathname);
void COM_StripExtension (char *in, char *out);
void COM_FileBase (char *in, char *out);
void COM_DefaultExtension (char *path, char *extension);

char *va(char *format, ...);
// does a varargs printf into a temp buffer

//============================================================================

extern int com_filesize;
struct cache_user_s;

extern char com_gamedir[MAX_OSPATH];

void COM_WriteFile (char *filename, void *data, int len);
int COM_OpenFile (char *filename, int *hndl);
int COM_FOpenFile (char *filename, FILE **file);
void COM_CloseFile (int h);

uint8_t *COM_LoadStackFile (char *path, void *buffer, int bufsize);
uint8_t *COM_LoadTempFile (char *path);
uint8_t *COM_LoadHunkFile (char *path);
void COM_LoadCacheFile (char *path, struct cache_user_s *cu);

extern struct cvar_s registered;

extern bool standard_quake, rogue, hipnotic;