compat.h

关于tor匿名通信的源代码

/* Copyright (c) 2003-2004, Roger Dingledinex
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2008, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/* $Id$ */

#ifndef __COMPAT_H
#define __COMPAT_H
#define COMPAT_H_ID "$Id$"

#include "orconfig.h"
#include "torint.h"
#ifdef MS_WINDOWS
#define WIN32_WINNT 0x400
#define _WIN32_WINNT 0x400
#define WIN32_LEAN_AND_MEAN
#if defined(_MSC_VER) && (_MSC_VER < 1300)
#include <winsock.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#include <stdarg.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET6_IN6_H
#include <netinet6/in6.h>
#endif

#ifndef NULL_REP_IS_ZERO_BYTES
#error "It seems your platform does not represent NULL as zero. We can't cope."
#endif

#if 'a'!=97 || 'z'!=122 || 'A'!=65 || ' '!=32
#error "It seems that you encode characters in something other than ASCII."
#endif

/* ===== Compiler compatibility */

/* GCC can check printf types on arbitrary functions. */
#ifdef __GNUC__
#define CHECK_PRINTF(formatIdx, firstArg) \
   __attribute__ ((format(printf, formatIdx, firstArg)))
#else
#define CHECK_PRINTF(formatIdx, firstArg)
#endif

/* inline is __inline on windows. */
#ifdef MS_WINDOWS
#define INLINE __inline
#else
#define INLINE inline
#endif

/* Try to get a reasonable __func__ substitute in place. */
#if defined(_MSC_VER)
/* MSVC compilers before VC7 don't have __func__ at all; later ones call it
 * __FUNCTION__. */
#if _MSC_VER < 1300
#define __func__ "???"
#else
#define __func__ __FUNCTION__
#endif

#else
/* For platforms where autoconf works, make sure __func__ is defined
 * sanely. */
#ifndef HAVE_MACRO__func__
#ifdef HAVE_MACRO__FUNCTION__
#define __func__ __FUNCTION__
#elif HAVE_MACRO__FUNC__
#define __func__ __FUNC__
#else
#define __func__ "???"
#endif
#endif /* ifndef MAVE_MACRO__func__ */
#endif /* if not windows */

#if defined(_MSC_VER) && (_MSC_VER < 1300)
/* MSVC versions before 7 apparently don't believe that you can cast uint64_t
 * to double and really mean it. */
extern INLINE double U64_TO_DBL(uint64_t x) {
  int64_t i = (int64_t) x;
  return (i < 0) ? ((double) INT64_MAX) : (double) i;
}
#define DBL_TO_U64(x) ((uint64_t)(int64_t) (x))
#else
#define U64_TO_DBL(x) ((double) (x))
#define DBL_TO_U64(x) ((uint64_t) (x))
#endif

/* GCC has several useful attributes. */
#if defined(__GNUC__) && __GNUC__ >= 3
#define ATTR_NORETURN __attribute__((noreturn))
#define ATTR_PURE __attribute__((pure))
#define ATTR_CONST __attribute__((const))
#define ATTR_MALLOC __attribute__((malloc))
#define ATTR_NORETURN __attribute__((noreturn))
#define ATTR_NONNULL(x) __attribute__((nonnull x))
/** Macro: Evaluates to <b>exp</b> and hints the compiler that the value
 * of <b>exp</b> will probably be true. */
#define PREDICT_LIKELY(exp) __builtin_expect((exp), 1)
/** Macro: Evaluates to <b>exp</b> and hints the compiler that the value
 * of <b>exp</b> will probably be false. */
#define PREDICT_UNLIKELY(exp) __builtin_expect((exp), 0)
#else
#define ATTR_NORETURN
#define ATTR_PURE
#define ATTR_CONST
#define ATTR_MALLOC
#define ATTR_NORETURN
#define ATTR_NONNULL(x)
#define PREDICT_LIKELY(exp) (exp)
#define PREDICT_UNLIKELY(exp) (exp)
#endif

/* Ways to declare macros. */
#define STMT_NIL (void)0
#ifdef __GNUC__
#define STMT_BEGIN (void) ({
#define STMT_END })
#elif defined(sun) || defined(__sun__)
#define STMT_BEGIN if (1) {
#define STMT_END } else STMT_NIL
#else
#define STMT_BEGIN do {
#define STMT_END } while (0)
#endif

/* ===== String compatibility */
#ifdef MS_WINDOWS
/* Windows names string functions differently from most other platforms. */
#define strncasecmp strnicmp
#define strcasecmp stricmp
#endif
#ifndef HAVE_STRLCAT
size_t strlcat(char *dst, const char *src, size_t siz) ATTR_NONNULL((1,2));
#endif
#ifndef HAVE_STRLCPY
size_t strlcpy(char *dst, const char *src, size_t siz) ATTR_NONNULL((1,2));
#endif

#ifdef _MSC_VER
#define U64_PRINTF_ARG(a) (a)
#define U64_SCANF_ARG(a) (a)
#define U64_LITERAL(n) (n ## ui64)
#else
#define U64_PRINTF_ARG(a) ((long long unsigned int)(a))
#define U64_SCANF_ARG(a) ((long long unsigned int*)(a))
#define U64_LITERAL(n) (n ## llu)
#endif

#if defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__)
#define U64_FORMAT "%I64u"
#else
#define U64_FORMAT "%llu"
#endif

/** Represents an mmaped file. Allocated via tor_mmap_file; freed with
 * tor_munmap_file. */
typedef struct tor_mmap_t {
  const char *data; /**< Mapping of the file's contents. */
  size_t size; /**< Size of the file. */
} tor_mmap_t;

tor_mmap_t *tor_mmap_file(const char *filename) ATTR_NONNULL((1));
void tor_munmap_file(tor_mmap_t *handle) ATTR_NONNULL((1));

int tor_snprintf(char *str, size_t size, const char *format, ...)
  CHECK_PRINTF(3,4) ATTR_NONNULL((1,3));
int tor_vsnprintf(char *str, size_t size, const char *format, va_list args)
  ATTR_NONNULL((1,3));

const void *tor_memmem(const void *haystack, size_t hlen, const void *needle,
                       size_t nlen)  ATTR_PURE ATTR_NONNULL((1,3));
static const void *tor_memstr(const void *haystack, size_t hlen,
                           const char *needle) ATTR_PURE ATTR_NONNULL((1,3));
static INLINE const void *
tor_memstr(const void *haystack, size_t hlen, const char *needle)
{
  return tor_memmem(haystack, hlen, needle, strlen(needle));
}

#define TOR_ISALPHA(c)   isalpha((int)(unsigned char)(c))
#define TOR_ISALNUM(c)   isalnum((int)(unsigned char)(c))
#define TOR_ISSPACE(c)   isspace((int)(unsigned char)(c))
#define TOR_ISXDIGIT(c) isxdigit((int)(unsigned char)(c))
#define TOR_ISDIGIT(c)   isdigit((int)(unsigned char)(c))
#define TOR_ISPRINT(c)   isprint((int)(unsigned char)(c))
#define TOR_ISLOWER(c)   islower((int)(unsigned char)(c))
#define TOR_ISUPPER(c)   isupper((int)(unsigned char)(c))

#define TOR_TOLOWER(c)   ((char)tolower((int)(unsigned char)(c)))
#define TOR_TOUPPER(c)   ((char)toupper((int)(unsigned char)(c)))

#ifdef MS_WINDOWS
#define _SHORT_FILE_ (tor_fix_source_file(__FILE__))
const char *tor_fix_source_file(const char *fname);
#else
#define _SHORT_FILE_ (__FILE__)
#define tor_fix_source_file(s) (s)
#endif

/* ===== Time compatibility */
#if !defined(HAVE_GETTIMEOFDAY) && !defined(HAVE_STRUCT_TIMEVAL_TV_SEC)
struct timeval {
  time_t tv_sec;
  unsigned int tv_usec;
};
#endif

void tor_gettimeofday(struct timeval *timeval);

#ifdef HAVE_LOCALTIME_R
#define tor_localtime_r localtime_r
#else
struct tm *tor_localtime_r(const time_t *timep, struct tm *result);
#endif

#ifdef HAVE_GMTIME_R
#define tor_gmtime_r gmtime_r
#else
struct tm *tor_gmtime_r(const time_t *timep, struct tm *result);
#endif

/* ===== File compatibility */
int replace_file(const char *from, const char *to);
int touch_file(const char *fname);

#ifdef MS_WINDOWS
#define PATH_SEPARATOR "\\"
#else
#define PATH_SEPARATOR "/"
#endif

/* ===== Net compatibility */

int tor_close_socket(int s);
int tor_open_socket(int domain, int type, int protocol);