qcommon.h

/*
	grabbed memory management from Quake 2 
	https://github.com/id-Software/Quake-2


*/


#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <stddef.h>

#ifndef __BYTEBOOL__
#define __BYTEBOOL__
typedef enum { qfalse, qtrue } qboolean;
typedef unsigned char byte;
#endif

#define	MAXPRINTMSG	4096
#define	Z_MAGIC		0x1d1d
#define b_flush fflush(stdin)

//could also work with byte * for casting posx...
#define container_of(posx, type, member) \
	((char *)posx - offsetof(type, member))

typedef struct
{
	qboolean	allowoverflow;	// if false, do a Com_Error
	qboolean	overflowed;		// set to true if the buffer size failed (with allowoverflow set)
	qboolean	oob;			// set to true if the buffer size failed (with allowoverflow set)
	byte	*data;
	int		maxsize;
	int		cursize;
	int		readcount;
	int		bit;				// for bitwise reads and writes
} msg_t;

typedef struct zhead_s
{
	struct zhead_s	*prev, *next;
	short	magic;
	short	tag;			// for group free
	int		size;
} zhead_t;


zhead_t		z_chain;
int		z_count, z_bytes;

void Z_Free (void *ptr);
void *Z_Malloc (int size);			// returns 0 filled memory
void *Z_TagMalloc (int size, int tag);
void Z_FreeTags (int tag);

void	Sys_Error (char *error, ...);
void Com_Printf (char *fmt, ...);