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, see
  17  *  <http://www.gnu.org/licenses/>.
  18  *
  19  *  Davide Libenzi <davidel@xmailserver.org>
  20  *
  21  */
  22
  23 #if !defined(XMACROS_H)
  24 #define XMACROS_H
  25
  26
  27
  28
  29 #define XDL_MIN(a, b) ((a) < (b) ? (a): (b))
  30 #define XDL_MAX(a, b) ((a) > (b) ? (a): (b))
  31 #define XDL_ABS(v) ((v) >= 0 ? (v): -(v))
  32 #define XDL_ISDIGIT(c) ((c) >= '0' && (c) <= '9')
  33 #define XDL_ISSPACE(c) (isspace((unsigned char)(c)))
  34 #define XDL_ADDBITS(v,b)        ((v) + ((v) >> (b)))
  35 #define XDL_MASKBITS(b)         ((1UL << (b)) - 1)
  36 #define XDL_HASHLONG(v,b)       (XDL_ADDBITS((unsigned long)(v), b) & XDL_MASKBITS(b))
  37 #define XDL_LE32_PUT(p, v) \
  38 do { \
  39         unsigned char *__p = (unsigned char *) (p); \
  40         *__p++ = (unsigned char) (v); \
  41         *__p++ = (unsigned char) ((v) >> 8); \
  42         *__p++ = (unsigned char) ((v) >> 16); \
  43         *__p = (unsigned char) ((v) >> 24); \
  44 } while (0)
  45 #define XDL_LE32_GET(p, v) \
  46 do { \
  47         unsigned char const *__p = (unsigned char const *) (p); \
  48         (v) = (unsigned long) __p[0] | ((unsigned long) __p[1]) << 8 | \
  49                 ((unsigned long) __p[2]) << 16 | ((unsigned long) __p[3]) << 24; \
  50 } while (0)
  51
  52 /* Allocate an array of nr elements, returns NULL on failure */
  53 #define XDL_ALLOC_ARRAY(p, nr)                          \
  54         ((p) = SIZE_MAX / sizeof(*(p)) >= (size_t)(nr)  \
  55                 ? xdl_malloc((nr) * sizeof(*(p)))       \
  56                 : NULL)
  57
  58 /* Allocate an array of nr zeroed out elements, returns NULL on failure */
  59 #define XDL_CALLOC_ARRAY(p, nr) ((p) = xdl_calloc(nr, sizeof(*(p))))
  60
  61 /*
  62  * Ensure array p can accommodate at least nr elements, growing the
  63  * array and updating alloc (which is the number of allocated
  64  * elements) as necessary. Frees p and returns -1 on failure, returns
  65  * 0 on success
  66  */
  67 #define XDL_ALLOC_GROW(p, nr, alloc)    \
  68         (-!((nr) <= (alloc) ||          \
  69             ((p) = xdl_alloc_grow_helper((p), (nr), &(alloc), sizeof(*(p))))))
  70
  71 #endif /* #if !defined(XMACROS_H) */