mirror of
https://gitlab.labs.nic.cz/labs/bird.git
synced 2024-05-11 16:54:54 +00:00
232 lines
6.1 KiB
C
232 lines
6.1 KiB
C
/*
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* BIRD Library
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*
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* (c) 1998--2004 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_BIRDLIB_H_
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#define _BIRD_BIRDLIB_H_
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#include <stddef.h>
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#include "sysdep/config.h"
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#include "lib/alloca.h"
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/* Ugly structure offset handling macros */
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#define SAME_TYPE(a, b) ({ int _ = ((a) != (b)); !_; })
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#define TYPE_CAST(from, to, what) ( SAME_TYPE(((from) NULL), (what)), ((to) (what)))
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#ifdef offsetof
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#define OFFSETOF offsetof
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#else
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#define OFFSETOF(s, i) ((size_t) &((s *)0)->i)
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#endif
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#define SKIP_BACK(s, i, p) ({ s *_ptr = ((s *)((char *)p - OFFSETOF(s, i))); SAME_TYPE(&_ptr->i, p); _ptr; })
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#define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1))
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#define CPU_STRUCT_ALIGN (MAX_(_Alignof(void*), _Alignof(u64)))
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#define BIRD_CPU_ALIGN(s) BIRD_ALIGN((s), CPU_STRUCT_ALIGN)
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/* Structure item alignment macros */
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#define PADDING_NAME(id) _padding_##id
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#define PADDING_(id, sz) u8 PADDING_NAME(id)[sz]
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#if CPU_POINTER_ALIGNMENT == 4
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#define PADDING(id, n32, n64) PADDING_(id, n32)
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#elif CPU_POINTER_ALIGNMENT == 8
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#define PADDING(id, n32, n64) PADDING_(id, n64)
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#else
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#error "Strange CPU pointer alignment: " CPU_POINTER_ALIGNMENT
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#endif
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/* Utility macros */
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#define MIN_(a,b) (((a)<(b))?(a):(b))
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#define MAX_(a,b) (((a)>(b))?(a):(b))
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#ifndef PARSER
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#undef MIN
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#undef MAX
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#define MIN(a,b) MIN_(a,b)
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#define MAX(a,b) MAX_(a,b)
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#endif
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#define ROUND_DOWN_POW2(a,b) ((a) & ~((b)-1))
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#define ROUND_UP_POW2(a,b) (((a)+((b)-1)) & ~((b)-1))
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#define U64(c) UINT64_C(c)
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#define ABS(a) ((a)>=0 ? (a) : -(a))
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#define DELTA(a,b) (((a)>=(b))?(a)-(b):(b)-(a))
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#define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))
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#define BYTES(n) ((((uint) (n)) + 7) / 8)
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#define CALL(fn, args...) ({ if (fn) fn(args); })
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#define ADVANCE(w, r, l) ({ r -= (l); w += (l); })
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static inline int uint_cmp(uint i1, uint i2)
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{ return (int)(i1 > i2) - (int)(i1 < i2); }
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static inline int u64_cmp(u64 i1, u64 i2)
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{ return (int)(i1 > i2) - (int)(i1 < i2); }
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/* Bitfield macros */
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/* b is u32 array (or ptr), l is size of it in bits (multiple of 32), p is 0..(l-1) */
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#define BIT32_VAL(p) (((u32) 1) << ((p) % 32))
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#define BIT32_TEST(b,p) ((b)[(p)/32] & BIT32_VAL(p))
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#define BIT32_SET(b,p) ((b)[(p)/32] |= BIT32_VAL(p))
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#define BIT32_CLR(b,p) ((b)[(p)/32] &= ~BIT32_VAL(p))
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#define BIT32_ZERO(b,l) memset((b), 0, (l)/8)
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/* The same, but counting bits from MSB */
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#define BIT32R_VAL(p) ((((u32) 1) << 31) >> ((p) % 32))
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#define BIT32R_TEST(b,p) ((b)[(p)/32] & BIT32R_VAL(p))
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#define BIT32R_SET(b,p) ((b)[(p)/32] |= BIT32R_VAL(p))
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#define BIT32R_CLR(b,p) ((b)[(p)/32] &= ~BIT32R_VAL(p))
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#define BIT32R_ZERO(b,l) memset((b), 0, (l)/8)
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#ifndef NULL
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#define NULL ((void *) 0)
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#endif
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/* Macros for gcc attributes */
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#define NORET __attribute__((noreturn))
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#define USE_RESULT __atribute__((warn_unused_result))
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#define UNUSED __attribute__((unused))
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#define PACKED __attribute__((packed))
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#define NONNULL(...) __attribute__((nonnull((__VA_ARGS__))))
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#define STATIC_ASSERT(EXP) _Static_assert(EXP, #EXP)
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#define STATIC_ASSERT_MSG(EXP,MSG) _Static_assert(EXP, MSG)
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/* Microsecond time */
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typedef s64 btime;
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//typedef s64 bird_clock_t;
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#define S_ * (btime) 1000000
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#define MS_ * (btime) 1000
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#define US_ * (btime) 1
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#define TO_S /1000000
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#define TO_MS /1000
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#define TO_US /1
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#define TO_NS * (btime) 1000
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#ifndef PARSER
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#define S S_
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#define MS MS_
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#define US US_
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#define NS /1000
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#endif
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#define TIME_INFINITY ((s64) 0x7fffffffffffffff)
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/* Rate limiting */
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struct tbf {
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btime timestamp; /* Last update */
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u64 count; /* Available micro-tokens */
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u16 burst; /* Max number of tokens */
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u16 rate; /* Rate of replenishment (tokens / sec) */
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u32 drop; /* Number of failed request since last successful */
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};
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/* Default TBF values for rate limiting log messages */
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#define TBF_DEFAULT_LOG_LIMITS { .rate = 1, .burst = 5 }
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int tbf_limit(struct tbf *f);
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/* Logging and dying */
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typedef struct buffer {
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byte *start;
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byte *pos;
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byte *end;
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} buffer;
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#define STACK_BUFFER_INIT(buf,size) \
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do { \
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buf.start = alloca(size); \
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buf.pos = buf.start; \
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buf.end = buf.start + size; \
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} while(0)
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#define LOG_BUFFER_INIT(buf) \
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STACK_BUFFER_INIT(buf, LOG_BUFFER_SIZE)
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#define LOG_BUFFER_SIZE 1024
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#define log log_msg
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void log_commit(int class, buffer *buf);
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void log_msg(const char *msg, ...);
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void log_rl(struct tbf *rl, const char *msg, ...);
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void die(const char *msg, ...) NORET;
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void bug(const char *msg, ...) NORET;
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#define L_DEBUG "\001" /* Debugging messages */
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#define L_TRACE "\002" /* Protocol tracing */
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#define L_INFO "\003" /* Informational messages */
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#define L_REMOTE "\004" /* Remote protocol errors */
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#define L_WARN "\005" /* Local warnings */
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#define L_ERR "\006" /* Local errors */
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#define L_AUTH "\007" /* Authorization failed etc. */
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#define L_FATAL "\010" /* Fatal errors */
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#define L_BUG "\011" /* BIRD bugs */
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void debug(const char *msg, ...); /* Printf to debug output */
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void debug_safe(const char *msg); /* Printf to debug output, async-safe */
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/* Debugging */
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#if defined(LOCAL_DEBUG) || defined(GLOBAL_DEBUG)
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#define DBG(x, y...) debug(x, ##y)
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#define DBGL(x, y...) debug(x "\n", ##y)
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#elif defined(DEBUG_TO_LOG)
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#define DBG(...) do { } while (0)
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#define DBGL(...) log(L_DEBUG __VA_ARGS__)
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#else
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#define DBG(...) do { } while(0)
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#define DBGL(...) do { } while (0)
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#endif
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#define ASSERT_DIE(x) do { if (!(x)) bug("Assertion '%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)
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#define EXPENSIVE_CHECK(x) /* intentionally left blank */
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#ifdef DEBUGGING
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#define ASSERT(x) ASSERT_DIE(x)
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#define ASSUME(x) ASSERT_DIE(x)
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#ifdef ENABLE_EXPENSIVE_CHECKS
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#undef EXPENSIVE_CHECK
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#define EXPENSIVE_CHECK(x) ASSERT_DIE(x)
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#endif
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#else
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#define ASSERT(x) do { if (!(x)) log(L_BUG "Assertion '%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)
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#define ASSUME(x) /* intentionally left blank */
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#endif
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#ifdef DEBUGGING
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asm(
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".pushsection \".debug_gdb_scripts\", \"MS\",@progbits,1\n"
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".byte 1\n" /* Python */
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".asciz \"bird-gdb.py\"\n"
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".popsection\n"
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);
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#endif
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/* Pseudorandom numbers */
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u32 random_u32(void);
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void random_init(void);
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void random_bytes(void *buf, size_t size);
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#endif
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