jnlib/mischelp.h

   1 /* mischelp.h - Miscellaneous helper macros and functions
   2  * Copyright (C) 1999, 2000, 2001, 2002, 2003,
   3  *               2006, 2007  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 3 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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #ifndef LIBJNLIB_MISCHELP_H
  22 #define LIBJNLIB_MISCHHELP_H
  23
  24
  25 /* Check whether the files NAME1 and NAME2 are identical.  This is for
  26    example achieved by comparing the inode numbers of the files.  */
  27 int same_file_p (const char *name1, const char *name2);
  28
  29
  30 #ifndef HAVE_TIMEGM
  31 #include <time.h>
  32 time_t timegm (struct tm *tm);
  33 #endif /*!HAVE_TIMEGM*/
  34
  35
  36 #define DIM(v)               (sizeof(v)/sizeof((v)[0]))
  37 #define DIMof(type,member)   DIM(((type *)0)->member)
  38
  39
  40 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5 )
  41 # define JNLIB_GCC_M_FUNCTION 1
  42 # define JNLIB_GCC_A_NR              __attribute__ ((noreturn))
  43 # define JNLIB_GCC_A_PRINTF( f, a )  __attribute__ ((format (printf,f,a)))
  44 # define JNLIB_GCC_A_NR_PRINTF( f, a ) \
  45                             __attribute__ ((noreturn, format (printf,f,a)))
  46 #else
  47 # define JNLIB_GCC_A_NR
  48 # define JNLIB_GCC_A_PRINTF( f, a )
  49 # define JNLIB_GCC_A_NR_PRINTF( f, a )
  50 #endif
  51
  52
  53 /* To avoid that a compiler optimizes certain memset calls away, these
  54    macros may be used instead. */
  55 #define wipememory2(_ptr,_set,_len) do { \
  56               volatile char *_vptr=(volatile char *)(_ptr); \
  57               size_t _vlen=(_len); \
  58               while(_vlen) { *_vptr=(_set); _vptr++; _vlen--; } \
  59                   } while(0)
  60 #define wipememory(_ptr,_len) wipememory2(_ptr,0,_len)
  61
  62
  63
  64 #endif /*LIBJNLIB_MISCHELP_H*/