#include <errno.h>
+#include "compiler-tests.h"
+
+#include "varattrs.h"
+
+/*
+ * If we're compiling with Visual Studio, make sure we have at least
+ * VS 2015 or later, so we have sufficient C99 support.
+ *
+ * XXX - verify that we have at least C99 support on UN*Xes?
+ *
+ * What about MinGW or various DOS toolchains? We're currently assuming
+ * sufficient C99 support there.
+ */
+#if defined(_MSC_VER)
+ /*
+ * Make sure we have VS 2015 or later.
+ */
+ #if _MSC_VER < 1900
+ #error "Building tcpdump requires VS 2015 or later"
+ #endif
+#endif
+
/*
* Get the C99 types, and the PRI[doux]64 format strings, defined.
*/
* worry about other headers including it and causing
* clashes.
*/
- #if defined(_MSC_VER)
- /*
- * Compiler is MSVC.
- */
- #if _MSC_VER >= 1800
- /*
- * VS 2013 or newer; we have <inttypes.h>.
- */
- #include <inttypes.h>
- #else
- /*
- * Earlier VS; we have to define this stuff ourselves.
- */
- typedef unsigned char uint8_t;
- typedef signed char int8_t;
- typedef unsigned short uint16_t;
- typedef signed short int16_t;
- typedef unsigned int uint32_t;
- typedef signed int int32_t;
- #ifdef _MSC_EXTENSIONS
- typedef unsigned _int64 uint64_t;
- typedef _int64 int64_t;
- #else /* _MSC_EXTENSIONS */
- typedef unsigned long long uint64_t;
- typedef long long int64_t;
- #endif
-
- /*
- * We have _strtoi64(). Use that for strtoint64_t().
- */
- #define strtoint64_t _strtoi64
- #endif
+ /*
+ * Include <inttypes.h> to get the integer types and PRi[doux]64 values
+ * defined.
+ *
+ * If the compiler is MSVC, we require VS 2015 or newer, so we
+ * have <inttypes.h> - and support for %zu in the formatted
+ * printing functions.
+ *
+ * If the compiler is MinGW, we assume we have <inttypes.h> - and
+ * support for %zu in the formatted printing functions.
+ *
+ * If the target is UN*X, we assume we have a C99-or-later development
+ * environment, and thus have <inttypes.h> - and support for %zu in
+ * the formatted printing functions.
+ *
+ * If the target is MS-DOS, we assume we have <inttypes.h> - and support
+ * for %zu in the formatted printing functions.
+ */
+ #include <inttypes.h>
+
+ #if defined(_MSC_VER)
/*
* Suppress definition of intN_t in bittypes.h, which might be included
* by <pcap/pcap.h> in older versions of WinPcap.
- * (Yes, HAVE_U_INTn_T, as the definition guards are UN*X-oriented, and
- * we check for u_intN_t in the UN*X configure script.)
+ * (Yes, HAVE_U_INTn_T, as the definition guards are UN*X-oriented.)
*/
#define HAVE_U_INT8_T
#define HAVE_U_INT16_T
#define HAVE_U_INT32_T
#define HAVE_U_INT64_T
-
- /*
- * These may be defined by <inttypes.h>. If not, define them
- * ourselves.
- *
- * XXX - for MSVC, we always want the _MSC_EXTENSIONS versions.
- * What about other compilers? If, as the MinGW Web site says MinGW
- * does, the other compilers just use Microsoft's run-time library,
- * then they should probably use the _MSC_EXTENSIONS even if the
- * compiler doesn't define _MSC_EXTENSIONS.
- */
- #ifndef PRId64
- #ifdef _MSC_EXTENSIONS
- #define PRId64 "I64d"
- #else
- #define PRId64 "lld"
- #endif
- #endif /* PRId64 */
-
- #ifndef PRIo64
- #ifdef _MSC_EXTENSIONS
- #define PRIo64 "I64o"
- #else
- #define PRIo64 "llo"
- #endif
- #endif /* PRIo64 */
-
- #ifndef PRIx64
- #ifdef _MSC_EXTENSIONS
- #define PRIx64 "I64x"
- #else
- #define PRIx64 "llx"
- #endif
- #endif
-
- #ifndef PRIu64
- #ifdef _MSC_EXTENSIONS
- #define PRIu64 "I64u"
- #else
- #define PRIu64 "llu"
- #endif
- #endif
- #elif defined(__MINGW32__) || !defined(_WIN32)
- /*
- * Compiler is MinGW or target is UN*X or MS-DOS. Just use
- * <inttypes.h>.
- */
- #include <inttypes.h>
#endif
#endif /* HAVE_PCAP_PCAP_INTTYPES_H */
#include <stdio.h>
#include <winsock2.h>
#include <ws2tcpip.h>
-#include <ctype.h>
#include <time.h>
#include <io.h>
#include <fcntl.h>
#ifdef _MSC_VER
/*
* Compiler is MSVC.
+ *
+ * We require VS 2015 or newer, so we have strtoll(). Use that for
+ * strtoint64_t().
*/
- #if _MSC_VER >= 1800
- /*
- * VS 2013 or newer; we have strtoll(). Use that for strtoint64_t().
- */
- #define strtoint64_t strtoll
- #else
- /*
- * Earlier VS; we don't have strtoll(), but we do have
- * _strtoi64(). Use that for strtoint64_t().
- */
- #define strtoint64_t _strtoi64
- #endif
+ #define strtoint64_t strtoll
/*
- * Microsoft's documentation doesn't speak of LL as a valid
- * suffix for 64-bit integers, so we'll just use i64.
+ * And we have LL as a suffix for constants, so use that.
*/
- #define INT64_T_CONSTANT(constant) (constant##i64)
+ #define INT64_T_CONSTANT(constant) (constant##LL)
#else
/*
* Non-Microsoft compiler.
#endif
#ifdef _MSC_VER
-#define stat _stat
-#define open _open
-#define fstat _fstat
-#define read _read
-#define close _close
-#define O_RDONLY _O_RDONLY
+ /*
+ * Microsoft tries to avoid polluting the C namespace with UN*Xisms,
+ * by adding a preceding underscore; we *want* the UN*Xisms, so add
+ * #defines to let us use them.
+ */
+ #define isatty _isatty
+ #define stat _stat
+ #define strdup _strdup
+ #define open _open
+ #define read _read
+ #define close _close
+ #define O_RDONLY _O_RDONLY
+
+ /*
+ * We define our_fstat64 as _fstati64, and define our_statb as
+ * struct _stati64, so we get 64-bit file sizes.
+ */
+ #define our_fstat _fstati64
+ #define our_statb struct _stati64
+
+ /*
+ * If <crtdbg.h> has been included, and _DEBUG is defined, and
+ * __STDC__ is zero, <crtdbg.h> will define strdup() to call
+ * _strdup_dbg(). So if it's already defined, don't redefine
+ * it.
+ */
+ #ifndef strdup
+ #define strdup _strdup
+ #endif
+
+ /*
+ * Windows doesn't have ssize_t; routines such as _read() return int.
+ */
+ typedef int ssize_t;
#endif /* _MSC_VER */
/*
#endif /* caddr_t */
#define MAXHOSTNAMELEN 64
-#define snprintf _snprintf
-#define vsnprintf _vsnprintf
#else /* _WIN32 */
* Includes and definitions for various flavors of UN*X.
*/
-#include <ctype.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/param.h>
#include <arpa/inet.h>
+/*
+ * We should have large file support enabled, if it's available,
+ * so just use fstat as our_fstat and struct stat as our_statb.
+ */
+#define our_fstat fstat
+#define our_statb struct stat
+
/*
* Assume all UN*Xes have strtoll(), and use it for strtoint64_t().
*/
* Assume LL works.
*/
#define INT64_T_CONSTANT(constant) (constant##LL)
-
#endif /* _WIN32 */
-#ifndef HAVE___ATTRIBUTE__
-#define __attribute__(x)
-#endif
-
/*
- * Used to declare a structure unaligned, so that the C compiler,
- * if necessary, generates code that doesn't assume alignment.
- * This is required because there is no guarantee that the packet
- * data we get from libpcap/WinPcap is properly aligned.
- *
- * This assumes that, for all compilers that support __attribute__:
- *
- * 1) they support __attribute__((packed));
- *
- * 2) for all instruction set architectures requiring strict
- * alignment, declaring a structure with that attribute
- * causes the compiler to generate code that handles
- * misaligned 2-byte, 4-byte, and 8-byte integral
- * quantities.
- *
- * It does not (yet) handle compilers where you can get the compiler
- * to generate code of that sort by some other means.
- *
- * This is required in order to, for example, keep the compiler from
- * generating, for
- *
- * if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
- *
- * in print-bootp.c, code that loads the first 4-byte word of a
- * "struct bootp", masking out the bp_hops field, and comparing the result
- * against 0x01010600.
- *
- * Note: this also requires that padding be put into the structure,
- * at least for compilers where it's implemented as __attribute__((packed)).
+ * Function attributes, for various compilers.
*/
-#if !(defined(_MSC_VER) && defined(UNALIGNED))
-/* MSVC may have its own macro defined with the same name and purpose. */
-#undef UNALIGNED
-#define UNALIGNED __attribute__((packed))
-#endif
+#include "funcattrs.h"
/*
* fopen() read and write modes for text files and binary files.
* an 80386, so, for example, it avoids the bswap instruction added in
* the 80486.
*
- * (We don't use them on OS X; Apple provides their own, which *doesn't*
- * avoid the bswap instruction, as OS X only supports machines that
+ * (We don't use them on macOS; Apple provides their own, which *doesn't*
+ * avoid the bswap instruction, as macOS only supports machines that
* have it.)
*/
#if defined(__GNUC__) && defined(__i386__) && !defined(__APPLE__) && !defined(__ntohl)
*/
/*
- * Function attributes, for various compilers.
+ * Statement attributes, for various compilers.
+ *
+ * This was introduced sufficiently recently that compilers implementing
+ * it also implement __has_attribute() (for example, GCC 5.0 and later
+ * have __has_attribute(), and the "fallthrough" attribute was introduced
+ * in GCC 7).
+ *
+ * Unfortunately, Clang does this wrong - a statement
+ *
+ * __attribute__ ((fallthrough));
+ *
+ * produces bogus -Wmissing-declaration "declaration does not declare
+ * anything" warnings (dear Clang: that's not a declaration, it's an
+ * empty statement). GCC, however, has no trouble with this.
*/
-#include "funcattrs.h"
-
-#ifndef min
-#define min(a,b) ((a)>(b)?(b):(a))
-#endif
-#ifndef max
-#define max(a,b) ((b)>(a)?(b):(a))
-#endif
-
-#ifdef __ATTRIBUTE___FALLTHROUGH_OK
+#if __has_attribute(fallthrough) && !defined(__clang__)
# define ND_FALL_THROUGH __attribute__ ((fallthrough))
#else
# define ND_FALL_THROUGH
-#endif /* __ATTRIBUTE___FALLTHROUGH_OK */
+#endif /* __has_attribute(fallthrough) */
#endif /* netdissect_stdinc_h */
projects / tcpdump / blobdiff