xdiff/xmacros.h

   1 /*
   2  *  LibXDiff by Davide Libenzi ( File Differential Library )
   3  *  Copyright (C) 2003  Davide Libenzi
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2.1 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  *  Davide Libenzi <davidel@xmailserver.org>
  20  *
  21  */
  22
  23 #if !defined(XMACROS_H)
  24 #define XMACROS_H
  25
  26
  27 #define GR_PRIME 0x9e370001UL
  28
  29
  30 #define XDL_MIN(a, b) ((a) < (b) ? (a): (b))
  31 #define XDL_MAX(a, b) ((a) > (b) ? (a): (b))
  32 #define XDL_ABS(v) ((v) >= 0 ? (v): -(v))
  33 #define XDL_ISDIGIT(c) ((c) >= '0' && (c) <= '9')
  34 #define XDL_HASHLONG(v, b) (((unsigned long)(v) * GR_PRIME) >> ((CHAR_BIT * sizeof(unsigned long)) - (b)))
  35 #define XDL_PTRFREE(p) do { if (p) { xdl_free(p); (p) = NULL; } } while (0)
  36 #define XDL_LE32_PUT(p, v) \
  37 do { \
  38         unsigned char *__p = (unsigned char *) (p); \
  39         *__p++ = (unsigned char) (v); \
  40         *__p++ = (unsigned char) ((v) >> 8); \
  41         *__p++ = (unsigned char) ((v) >> 16); \
  42         *__p = (unsigned char) ((v) >> 24); \
  43 } while (0)
  44 #define XDL_LE32_GET(p, v) \
  45 do { \
  46         unsigned char const *__p = (unsigned char const *) (p); \
  47         (v) = (unsigned long) __p[0] | ((unsigned long) __p[1]) << 8 | \
  48                 ((unsigned long) __p[2]) << 16 | ((unsigned long) __p[3]) << 24; \
  49 } while (0)
  50
  51
  52 #endif /* #if !defined(XMACROS_H) */
  53