Internet on FIRE

/*

 *        BIRD Library

 *

 *        (c) 1998--2004 Martin Mares <mj@ucw.cz>

 *

 *        Can be freely distributed and used under the terms of the GNU GPL.

 */

#ifndef _BIRD_BIRDLIB_H_

#define _BIRD_BIRDLIB_H_

#include "lib/alloca.h"

/* Ugly structure offset handling macros */

struct align_probe { char x; long int y; };

#define OFFSETOF(s, i) ((size_t) &((s *)0)->i)

#define SKIP_BACK(s, i, p) ((s *)((char *)p - OFFSETOF(s, i)))

#define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1))

#define CPU_STRUCT_ALIGN (sizeof(struct align_probe))

/* Utility macros */

#define MIN_(a,b) (((a)<(b))?(a):(b))

#define MAX_(a,b) (((a)>(b))?(a):(b))

#ifndef PARSER

#undef MIN

#undef MAX

#define MIN(a,b) MIN_(a,b)

#define MAX(a,b) MAX_(a,b)

#endif

#define U64(c) UINT64_C(c)

#define ABS(a)   ((a)>=0 ? (a) : -(a))

#define DELTA(a,b) (((a)>=(b))?(a)-(b):(b)-(a))

#define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))

#define BYTES(n) ((((uint) (n)) + 7) / 8)

#define CALL(fn, args...) ({ if (fn) fn(args); })

#define ADVANCE(w, r, l) ({ r -= l; w += l; })

static inline int uint_cmp(uint i1, uint i2)

{ return (int)(i1 > i2) - (int)(i1 < i2); }

static inline int u64_cmp(u64 i1, u64 i2)

{ return (int)(i1 > i2) - (int)(i1 < i2); }

/* Bitfield macros */

/* b is u32 array (or ptr), l is size of it in bits (multiple of 32), p is 0..(l-1) */

#define BIT32_VAL(p)                (((u32) 1) << ((p) % 32))

#define BIT32_TEST(b,p)                ((b)[(p)/32] & BIT32_VAL(p))

#define BIT32_SET(b,p)                ((b)[(p)/32] |= BIT32_VAL(p))

#define BIT32_CLR(b,p)                ((b)[(p)/32] &= ~BIT32_VAL(p))

#define BIT32_ZERO(b,l)                memset((b), 0, (l)/8)

#ifndef NULL

#define NULL ((void *) 0)

#endif

/* Macros for gcc attributes */

#define NORET __attribute__((noreturn))

#define UNUSED __attribute__((unused))

#define PACKED __attribute__((packed))

/* Microsecond time */

typedef s64 btime;

//typedef s64 bird_clock_t;

#define S_        * (btime) 1000000

#define MS_        * (btime) 1000

#define US_        * (btime) 1

#define TO_S        /1000000

#define TO_MS        /1000

#define TO_US        /1

#ifndef PARSER

#define S        S_

#define MS        MS_

#define US        US_

#define NS        /1000

#endif

#define TIME_INFINITY ((s64) 0x7fffffffffffffff)

/* Rate limiting */

struct tbf {

  btime timestamp;                        /* Last update */

  u64 count;                                /* Available micro-tokens */

  u16 burst;                                /* Max number of tokens */

  u16 rate;                                /* Rate of replenishment (tokens / sec) */

  u32 drop;                                /* Number of failed request since last successful */

};

/* Default TBF values for rate limiting log messages */

#define TBF_DEFAULT_LOG_LIMITS { .rate = 1, .burst = 5 }

int tbf_limit(struct tbf *f);

/* Logging and dying */

typedef struct buffer {

  byte *start;

  byte *pos;

  byte *end;

} buffer;

#define STACK_BUFFER_INIT(buf,size)                \

  do {                                                \

    buf.start = alloca(size);                        \

    buf.pos = buf.start;                        \

    buf.end = buf.start + size;                        \

  } while(0)

#define LOG_BUFFER_INIT(buf)                        \

  STACK_BUFFER_INIT(buf, LOG_BUFFER_SIZE)

#define LOG_BUFFER_SIZE 1024

#define log log_msg

void log_commit(int class, buffer *buf);

void log_msg(const char *msg, ...);

void log_rl(struct tbf *rl, const char *msg, ...);

void die(const char *msg, ...) NORET;

void bug(const char *msg, ...) NORET;

#define L_DEBUG "\001"                        /* Debugging messages */

#define L_TRACE "\002"                        /* Protocol tracing */

#define L_INFO "\003"                        /* Informational messages */

#define L_REMOTE "\004"                        /* Remote protocol errors */

#define L_WARN "\005"                        /* Local warnings */

#define L_ERR "\006"                        /* Local errors */

#define L_AUTH "\007"                        /* Authorization failed etc. */

#define L_FATAL "\010"                        /* Fatal errors */

#define L_BUG "\011"                        /* BIRD bugs */

void debug(const char *msg, ...);        /* Printf to debug output */

/* Debugging */

#if defined(LOCAL_DEBUG) || defined(GLOBAL_DEBUG)

#define DBG(x, y...) debug(x, ##y)

#else

#define DBG(x, y...) do { } while(0)

#endif

#ifdef DEBUGGING

#define ASSERT(x) do { if (!(x)) bug("Assertion `%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)

#else

#define ASSERT(x) do { } while(0)

#endif

/* Pseudorandom numbers */

u32 random_u32(void);

#endif