jnlib/mischelp.h

   1 /* mischelp.h - Miscellaneous helper macros and functions
   2  * Copyright (C) 1999, 2000, 2001, 2002, 2003,
   3  *               2006  Free Software Foundation, Inc.
   4  *
   5  * This file is part of JNLIB.
   6  *
   7  * JNLIB is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU Lesser General Public License as
   9  * published by the Free Software Foundation; either version 2.1 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * JNLIB is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  */
  22
  23 #ifndef LIBJNLIB_MISCHELP_H
  24 #define LIBJNLIB_MISCHHELP_H
  25
  26
  27 #ifndef HAVE_TIMEGM
  28 #include <time.h>
  29 time_t timegm (struct tm *tm);
  30 #endif /*!HAVE_TIMEGM*/
  31
  32
  33 #define DIM(v)               (sizeof(v)/sizeof((v)[0]))
  34 #define DIMof(type,member)   DIM(((type *)0)->member)
  35
  36
  37 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5 )
  38 # define JNLIB_GCC_M_FUNCTION 1
  39 # define JNLIB_GCC_A_NR              __attribute__ ((noreturn))
  40 # define JNLIB_GCC_A_PRINTF( f, a )  __attribute__ ((format (printf,f,a)))
  41 # define JNLIB_GCC_A_NR_PRINTF( f, a ) \
  42                             __attribute__ ((noreturn, format (printf,f,a)))
  43 #else
  44 # define JNLIB_GCC_A_NR
  45 # define JNLIB_GCC_A_PRINTF( f, a )
  46 # define JNLIB_GCC_A_NR_PRINTF( f, a )
  47 #endif
  48
  49
  50 /* To avoid that a compiler optimizes certain memset calls away, these
  51    macros may be used instead. */
  52 #define wipememory2(_ptr,_set,_len) do { \
  53               volatile char *_vptr=(volatile char *)(_ptr); \
  54               size_t _vlen=(_len); \
  55               while(_vlen) { *_vptr=(_set); _vptr++; _vlen--; } \
  56                   } while(0)
  57 #define wipememory(_ptr,_len) wipememory2(_ptr,0,_len)
  58
  59
  60
  61 #endif /*LIBJNLIB_MISCHELP_H*/