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/* 
|| This file is part of Pike. For copyright information see COPYRIGHT. 
|| Pike is distributed under GPL, LGPL and MPL. See the file COPYING 
|| for more information. 
|| $Id: pike_macros.h,v 1.38 2006/05/30 12:04:44 nilsson Exp $ 
*/ 
 
#ifndef MACROS_H 
#define MACROS_H 
 
#include <global.h> 
 
#ifdef HAVE_SYS_PARAM_H 
#include <sys/param.h> 
#endif 
 
#include "pike_memory.h" 
 
#define PTR_TO_INT(PTR) ((size_t) ((char *) (PTR) - (char *) NULL)) 
 
#define OFFSETOF(str_type, field) \ 
  PTR_TO_INT(& (((struct str_type *)NULL)->field)) 
#define BASEOF(ptr, str_type, field)  \ 
  ((struct str_type *)((char*)ptr - OFFSETOF(str_type, field))) 
 
#ifdef __cplusplus 
extern "C++" { 
  template<typename T> static inline int low_alignof_(T *ignored) 
  { 
    struct { char x; T y;} *bar = NULL; 
    return PTR_TO_INT(&bar->y); 
  } 
}; 
# define ALIGNOF(X) low_alignof_((X*)NULL) 
#else 
# define ALIGNOF(X) OFFSETOF({ char ignored_; X fooo_;}, fooo_) 
#endif 
 
#define NELEM(a) (sizeof (a) / sizeof ((a)[0])) 
#define ALLOC_STRUCT(X) ( (struct X *)xalloc(sizeof(struct X)) ) 
 
#define MINIMUM(X,Y) ((X)<(Y)?(X):(Y)) 
#define MAXIMUM(X,Y) ((X)>(Y)?(X):(Y)) 
 
 
#define is8bitalnum(X)        ("0000000000000000" \ 
                         "0000000000000000" \ 
                         "0000000000000000" \ 
                         "1111111111000000" \ 
                         "0111111111111111" \ 
                         "1111111111100001" \ 
                         "0111111111111111" \ 
                         "1111111111100000" \ 
                         "0000000000000000" \ 
                         "0000000000000000" \ 
                         "1011110101100010" \ 
                         "1011011001101110" \ 
                         "1111111111111111" \ 
                         "1111111011111111" \ 
                         "1111111111111111" \ 
                         "1111111011111111"[((unsigned)(X))&0xff] == '1') 
   
#define isidchar(X) is8bitalnum(X) 
 
#ifndef HAVE_ISGRAPH 
#define isgraph(X)  (ispunct(X) || isupper(X) || islower(X) || isdigit(X)) 
#endif /* !HAVE_ISGRAPH */ 
 
 
 
#define DO_ALIGN(X,Y) (((size_t)(X)+((Y)-1)) & -(Y)) 
#define CONSTANT_STRLEN(X) (sizeof(X) - sizeof("")) 
 
#define SET_NEXT_AND_FREE(p,free_item) do{    \ 
  next=p->next;                                 \ 
  while(p->refs == 1 && (next=p->next))         \ 
  {                                             \ 
    add_ref(next);                              \ 
    free_item(p);                               \ 
    p=next;                                     \ 
  }                                             \ 
  free_item(p);                                 \ 
}while(0) 
 
/* This variant never leaves p pointing at a deallocated block, as the 
 * one above can do. I.e. it frees a ref to the item p points at, and 
 * sets p to the same or next item with references, or sets it to 
 * zero. */ 
/* how can SET_NEXT_AND_FREE leave *next* pointing to a deallocated block? 
 * -Hubbe 
 */ 
/* Afaik it doesn't, but it leaves no value that is usable for the 
 * purposes this macro was made for. /mast */ 
#define FREE_AND_GET_REFERENCED(p, item_type, free_item) do {         \ 
  item_type *next;                                                      \ 
  while (1) {                                                           \ 
    if (p->refs > 1) {                                                  \ 
      free_item(p);                                                     \ 
      break;                                                            \ 
    }                                                                   \ 
    if (!(next = p->next)) {                                            \ 
      free_item(p);                                                     \ 
      p = 0;                                                            \ 
      break;                                                            \ 
    }                                                                   \ 
    add_ref(next);                                                      \ 
    free_item(p);                                                       \ 
    p = next;                                                           \ 
  }                                                                     \ 
} while (0) 
 
#define DOUBLELINK(first_object, o) do {      \ 
  debug_malloc_touch(o);                        \ 
  o->next=first_object;                         \ 
  o->prev=0;                                    \ 
  if(first_object) first_object->prev=o;        \ 
  first_object=o;                               \ 
}while(0) 
 
#define DOUBLEUNLINK(first_object,o) do{      \ 
  debug_malloc_touch(o);                        \ 
  if(o->prev) {                                 \ 
    o->prev->next=o->next;                      \ 
  }else {                                       \ 
    DO_IF_DEBUG(                                \ 
      if(first_object != o) {                   \ 
        describe(o);                            \ 
        Pike_fatal("Linked in wrong list!\n");  \ 
      }                                         \ 
    )                                           \ 
    first_object=o->next;                       \ 
  }                                             \ 
                                                \ 
  if(o->next) o->next->prev=o->prev;            \ 
}while(0) 
 
 
#define PIKE_XCONCAT(X,Y)     PIKE_CONCAT(X,Y) 
#define PIKE_XCONCAT3(X,Y,Z)        PIKE_CONCAT(X,Y,Z) 
#define PIKE_XCONCAT4(X,Y,Z,Q)      PIKE_CONCAT(X,Y,Z,Q) 
 
/* Useful to get a literal comma in an argument to a macro. */ 
#define COMMA , 
 
/* Needed for fsort_template.h */ 
PMOD_EXPORT int my_log2(size_t x); 
 
#endif