ether.h \
ethertype.h \
extract.h \
+ funcattrs.h \
getopt_long.h \
gmpls.h \
gmt2local.h \
*/
/*
- * Macros to extract possibly-unaligned big-endian integral values.
+ * Inline functions or macros to extract possibly-unaligned big-endian
+ * integral values.
*/
+#include "funcattrs.h"
+
+/*
+ * If we have versions of GCC or Clang that support an __attribute__
+ * to say "if we're building with unsigned behavior sanitization,
+ * don't complain about undefined behavior in this function", we
+ * label these functions with that attribute - we *know* it's undefined
+ * in the C standard, but we *also* know it does what we want with
+ * the ISA we're targeting and the compiler we're using.
+ *
+ * For GCC 4.9.0 and later, we use __attribute__((no_sanitize_undefined));
+ * pre-5.0 GCC doesn't have __has_attribute, and I'm not sure whether
+ * GCC or Clang first had __attribute__((no_sanitize(XXX)).
+ *
+ * For Clang, we check for __attribute__((no_sanitize(XXX)) with
+ * __has_attribute, as there are versions of Clang that support
+ * __attribute__((no_sanitize("undefined")) but don't support
+ * __attribute__((no_sanitize_undefined)).
+ *
+ * We define this here, rather than in funcattrs.h, because we
+ * only want it used here, we don't want it to be broadly used.
+ * (Any printer will get this defined, but this should at least
+ * make it harder for people to find.)
+ */
+#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 409)
+#define UNALIGNED_OK __attribute__((no_sanitize_undefined))
+#elif __has_attribute(no_sanitize)
+#define UNALIGNED_OK __attribute__((no_sanitize("undefined")))
+#else
+#define UNALIGNED_OK
+#endif
+
#ifdef LBL_ALIGN
/*
* The processor doesn't natively handle unaligned loads.
defined(__mips) || defined(__mips__))
/*
- * This is a GCC-compatible compiler and we have __attribute__, which
+* This is a GCC-compatible compiler and we have __attribute__, which
* we assume that mean we have __attribute__((packed)), and this is
* MIPS or Alpha, which has instructions that can help when doing
* unaligned loads.
uint32_t val;
} __attribute__((packed)) unaligned_uint32_t;
-static inline uint16_t
+UNALIGNED_OK static inline uint16_t
EXTRACT_16BITS(const void *p)
{
return ((uint16_t)ntohs(((const unaligned_uint16_t *)(p))->val));
}
-static inline uint32_t
+UNALIGNED_OK static inline uint32_t
EXTRACT_32BITS(const void *p)
{
return ((uint32_t)ntohl(((const unaligned_uint32_t *)(p))->val));
}
-static inline uint64_t
+UNALIGNED_OK static inline uint64_t
EXTRACT_64BITS(const void *p)
{
return ((uint64_t)(((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 0)->val)) << 32 |
* The processor natively handles unaligned loads, so we can just
* cast the pointer and fetch through it.
*/
-static inline uint16_t
+static inline uint16_t UNALIGNED_OK
EXTRACT_16BITS(const void *p)
{
return ((uint16_t)ntohs(*(const uint16_t *)(p)));
}
-static inline uint32_t
+static inline uint32_t UNALIGNED_OK
EXTRACT_32BITS(const void *p)
{
return ((uint32_t)ntohl(*(const uint32_t *)(p)));
}
-static inline uint64_t
+static inline uint64_t UNALIGNED_OK
EXTRACT_64BITS(const void *p)
{
return ((uint64_t)(((uint64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
--- /dev/null
+/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
+/*
+ * Copyright (c) 1993, 1994, 1995, 1996, 1997
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the Computer Systems
+ * Engineering Group at Lawrence Berkeley Laboratory.
+ * 4. Neither the name of the University nor of the Laboratory may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lib_funcattrs_h
+#define lib_funcattrs_h
+
+/*
+ * Attributes to apply to functions and their arguments, using various
+ * compiler-specific extensions.
+ */
+
+/*
+ * This was introduced by Clang:
+ *
+ * http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
+ *
+ * in some version (which version?); it has been picked up by GCC 5.0.
+ */
+#ifndef __has_attribute
+ /*
+ * It's a macro, so you can check whether it's defined to check
+ * whether it's supported.
+ *
+ * If it's not, define it to always return 0, so that we move on to
+ * the fallback checks.
+ */
+ #define __has_attribute(x) 0
+#endif
+
+/*
+ * NORETURN, before a function declaration, means "this function
+ * never returns". (It must go before the function declaration, e.g.
+ * "extern NORETURN func(...)" rather than after the function
+ * declaration, as the MSVC version has to go before the declaration.)
+ */
+#if __has_attribute(noreturn) \
+ || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
+ || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \
+ || (defined(__xlC__) && __xlC__ >= 0x0A01) \
+ || (defined(__HP_aCC) && __HP_aCC >= 61000)
+ /*
+ * Compiler with support for __attribute((noreturn)), or GCC 2.5 and
+ * later, or Solaris Studio 12 (Sun C 5.9) and later, or IBM XL C 10.1
+ * and later (do any earlier versions of XL C support this?), or
+ * HP aCC A.06.10 and later.
+ */
+ #define NORETURN __attribute((noreturn))
+#elif defined(_MSC_VER)
+ /*
+ * MSVC.
+ */
+ #define NORETURN __declspec(noreturn)
+#else
+ #define NORETURN
+#endif
+
+/*
+ * PRINTFLIKE(x,y), after a function declaration, means "this function
+ * does printf-style formatting, with the xth argument being the format
+ * string and the yth argument being the first argument for the format
+ * string".
+ */
+#if __has_attribute(__format__) \
+ || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \
+ || (defined(__xlC__) && __xlC__ >= 0x0A01) \
+ || (defined(__HP_aCC) && __HP_aCC >= 61000)
+ /*
+ * Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1
+ * and later (do any earlier versions of XL C support this?),
+ * or HP aCC A.06.10 and later.
+ */
+ #define PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
+#else
+ #define PRINTFLIKE(x,y)
+#endif
+
+/*
+ * For flagging arguments as format strings in MSVC.
+ */
+#if _MSC_VER >= 1400
+ #include <sal.h>
+ #if _MSC_VER > 1400
+ #define FORMAT_STRING(p) _Printf_format_string_ p
+ #else
+ #define FORMAT_STRING(p) __format_string p
+ #endif
+#else
+ #define FORMAT_STRING(p) p
+#endif
+
+#endif /* lib_funcattrs_h */
* end of Apple deprecation workaround macros
*/
+/*
+ * Function attributes, for various compilers.
+ */
+#include "funcattrs.h"
+
#ifndef min
#define min(a,b) ((a)>(b)?(b):(a))
#endif
extern const char istr[];
#if !defined(HAVE_SNPRINTF)
-int snprintf (char *str, size_t sz, const char *format, ...)
-#ifdef __ATTRIBUTE___FORMAT_OK
- __attribute__((format (printf, 3, 4)))
-#endif /* __ATTRIBUTE___FORMAT_OK */
- ;
+int snprintf (char *str, size_t sz, FORMAT_STRING(const char *format), ...)
+ PRINTFLIKE(3, 4);
#endif /* !defined(HAVE_SNPRINTF) */
#if !defined(HAVE_VSNPRINTF)
-int vsnprintf (char *str, size_t sz, const char *format, va_list ap)
-#ifdef __ATTRIBUTE___FORMAT_OK
- __attribute__((format (printf, 3, 0)))
-#endif /* __ATTRIBUTE___FORMAT_OK */
- ;
+int vsnprintf (char *str, size_t sz, FORMAT_STRING(const char *format),
+ va_list ap) PRINTFLIKE(3, 0);
#endif /* !defined(HAVE_VSNPRINTF) */
#ifndef HAVE_STRLCAT
static void ndo_default_print(netdissect_options *ndo, const u_char *bp,
u_int length);
-static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
- __attribute__((noreturn))
-#ifdef __ATTRIBUTE___FORMAT_OK
- __attribute__((format (printf, 2, 3)))
-#endif /* __ATTRIBUTE___FORMAT_OK */
- ;
-static void ndo_warning(netdissect_options *ndo, const char *fmt, ...)
-#ifdef __ATTRIBUTE___FORMAT_OK
- __attribute__((format (printf, 2, 3)))
-#endif /* __ATTRIBUTE___FORMAT_OK */
- ;
-
-static int ndo_printf(netdissect_options *ndo, const char *fmt, ...)
-#ifdef __ATTRIBUTE___FORMAT_OK
- __attribute ((format (printf, 2, 3)))
-#endif /* __ATTRIBUTE___FORMAT_OK */
- ;
+static void ndo_error(netdissect_options *ndo,
+ FORMAT_STRING(const char *fmt), ...)
+ NORETURN PRINTFLIKE(2, 3);
+static void ndo_warning(netdissect_options *ndo,
+ FORMAT_STRING(const char *fmt), ...)
+ PRINTFLIKE(2, 3);
+
+static int ndo_printf(netdissect_options *ndo,
+ FORMAT_STRING(const char *fmt), ...)
+ PRINTFLIKE(2, 3);
void
init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask,
#endif
/* Forwards */
-static void error(const char *, ...)
- __attribute__((noreturn))
-#ifdef __ATTRIBUTE___FORMAT_OK
- __attribute__((format (printf, 1, 2)))
-#endif /* __ATTRIBUTE___FORMAT_OK */
- ;
-static void warning(const char *, ...)
-#ifdef __ATTRIBUTE___FORMAT_OK
- __attribute__((format (printf, 1, 2)))
-#endif /* __ATTRIBUTE___FORMAT_OK */
- ;
-static void exit_tcpdump(int) __attribute__((noreturn));
+static void error(FORMAT_STRING(const char *), ...) NORETURN PRINTFLIKE(1, 2);
+static void warning(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2);
+static void exit_tcpdump(int) NORETURN;
static RETSIGTYPE cleanup(int);
static RETSIGTYPE child_cleanup(int);
static void print_version(void);
static void print_usage(void);
-static void show_tstamp_types_and_exit(pcap_t *, const char *device) __attribute__((noreturn));
-static void show_dlts_and_exit(pcap_t *, const char *device) __attribute__((noreturn));
+static void show_tstamp_types_and_exit(pcap_t *, const char *device) NORETURN;
+static void show_dlts_and_exit(pcap_t *, const char *device) NORETURN;
#ifdef HAVE_PCAP_FINDALLDEVS
-static void show_devices_and_exit (void) __attribute__((noreturn));
+static void show_devices_and_exit (void) NORETURN;
#endif
static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
projects / tcpdump / commitdiff
