The Tcpdump Group git mirrors - libpcap/blob - portability.h

   1 /*
   2  * Copyright (c) 1994, 1995, 1996
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the Computer Systems
  16  *      Engineering Group at Lawrence Berkeley Laboratory.
  17  * 4. Neither the name of the University nor of the Laboratory may be used
  18  *    to endorse or promote products derived from this software without
  19  *    specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef portability_h
  35 #define portability_h
  36
  37 /*
  38  * Helpers for portability between Windows and UN*X and between different
  39  * flavors of UN*X.
  40  */
  41 #include <stdarg.h>     /* we declare varargs functions on some platforms */
  42
  43 #include "pcap/funcattrs.h"
  44
  45 #ifdef __cplusplus
  46 extern "C" {
  47 #endif
  48
  49 #ifdef HAVE_STRLCAT
  50   #define pcapint_strlcat       strlcat
  51 #else
  52   #if defined(_MSC_VER) || defined(__MINGW32__)
  53     /*
  54      * strncat_s() is supported at least back to Visual
  55      * Studio 2005; we require Visual Studio 2015 or later.
  56      */
  57     #define pcapint_strlcat(x, y, z) \
  58         strncat_s((x), (z), (y), _TRUNCATE)
  59   #else
  60     /*
  61      * Define it ourselves.
  62      */
  63     extern size_t pcapint_strlcat(char * restrict dst, const char * restrict src, size_t dstsize);
  64   #endif
  65 #endif
  66
  67 #ifdef HAVE_STRLCPY
  68   #define pcapint_strlcpy       strlcpy
  69 #else
  70   #if defined(_MSC_VER) || defined(__MINGW32__)
  71     /*
  72      * strncpy_s() is supported at least back to Visual
  73      * Studio 2005; we require Visual Studio 2015 or later.
  74      */
  75     #define pcapint_strlcpy(x, y, z) \
  76         strncpy_s((x), (z), (y), _TRUNCATE)
  77   #else
  78     /*
  79      * Define it ourselves.
  80      */
  81     extern size_t pcapint_strlcpy(char * restrict dst, const char * restrict src, size_t dstsize);
  82   #endif
  83 #endif
  84
  85 #ifdef _MSC_VER
  86   /*
  87    * If <crtdbg.h> has been included, and _DEBUG is defined, and
  88    * __STDC__ is zero, <crtdbg.h> will define strdup() to call
  89    * _strdup_dbg().  So if it's already defined, don't redefine
  90    * it.
  91    */
  92   #ifndef strdup
  93   #define strdup        _strdup
  94   #endif
  95 #endif
  96
  97 /*
  98  * We want asprintf(), for some cases where we use it to construct
  99  * dynamically-allocated variable-length strings; it's present on
 100  * some, but not all, platforms.
 101  */
 102 #ifdef HAVE_ASPRINTF
 103 #define pcapint_asprintf asprintf
 104 #else
 105 extern int pcapint_asprintf(char **, PCAP_FORMAT_STRING(const char *), ...)
 106     PCAP_PRINTFLIKE(2, 3);
 107 #endif
 108
 109 #ifdef HAVE_VASPRINTF
 110 #define pcapint_vasprintf vasprintf
 111 #else
 112 extern int pcapint_vasprintf(char **, PCAP_FORMAT_STRING(const char *), va_list ap)
 113     PCAP_PRINTFLIKE(2, 0);
 114 #endif
 115
 116 /* For Solaris before 11. */
 117 #ifndef timeradd
 118 #define timeradd(a, b, result)                       \
 119   do {                                               \
 120     (result)->tv_sec = (a)->tv_sec + (b)->tv_sec;    \
 121     (result)->tv_usec = (a)->tv_usec + (b)->tv_usec; \
 122     if ((result)->tv_usec >= 1000000) {              \
 123       ++(result)->tv_sec;                            \
 124       (result)->tv_usec -= 1000000;                  \
 125     }                                                \
 126   } while (0)
 127 #endif /* timeradd */
 128 #ifndef timersub
 129 #define timersub(a, b, result)                       \
 130   do {                                               \
 131     (result)->tv_sec = (a)->tv_sec - (b)->tv_sec;    \
 132     (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
 133     if ((result)->tv_usec < 0) {                     \
 134       --(result)->tv_sec;                            \
 135       (result)->tv_usec += 1000000;                  \
 136     }                                                \
 137   } while (0)
 138 #endif /* timersub */
 139
 140 #ifdef HAVE_STRTOK_R
 141   #define pcapint_strtok_r      strtok_r
 142 #else
 143   #ifdef _WIN32
 144     /*
 145      * Microsoft gives it a different name.
 146      */
 147     #define pcapint_strtok_r    strtok_s
 148   #else
 149     /*
 150      * Define it ourselves.
 151      */
 152     extern char *pcapint_strtok_r(char *, const char *, char **);
 153   #endif
 154 #endif /* HAVE_STRTOK_R */
 155
 156 #ifdef _WIN32
 157   #if !defined(__cplusplus)
 158     #define inline __inline
 159   #endif
 160 #include <winsock2.h>
 161 #endif /* _WIN32 */
 162
 163 static inline int pcapint_sockinit(void)
 164 {
 165 #ifdef _WIN32
 166   WSADATA wsaData;
 167   return WSAStartup(MAKEWORD(2,2), &wsaData);
 168 #else
 169   return 0;
 170 #endif /* _WIN32 */
 171 }
 172
 173 static inline void pcapint_sockcleanup(void)
 174 {
 175 #ifdef _WIN32
 176   WSACleanup();
 177 #endif /* _WIN32 */
 178 }
 179
 180 #ifdef __cplusplus
 181 }
 182 #endif
 183
 184 #endif