src/util.h

   1 #ifndef INCLUDE_util_h__
   2 #define INCLUDE_util_h__
   3
   4 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
   5
   6 /*
   7  * Realloc the buffer pointed at by variable 'x' so that it can hold
   8  * at least 'nr' entries; the number of entries currently allocated
   9  * is 'alloc', using the standard growing factor alloc_nr() macro.
  10  *
  11  * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
  12  */
  13 #define alloc_nr(x) (((x)+16)*3/2)
  14 #define ALLOC_GROW(x, nr, alloc) \
  15         do { \
  16                 if ((nr) > alloc) { \
  17                         if (alloc_nr(alloc) < (nr)) \
  18                                 alloc = (nr); \
  19                         else \
  20                                 alloc = alloc_nr(alloc); \
  21                         x = xrealloc((x), alloc * sizeof(*(x))); \
  22                 } \
  23         } while(0)
  24
  25 #endif /* INCLUDE_util_h__ */