jnlib/mischelp.h

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