server/common/utils.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

/*
 * General convenience functions for crossfire.
 */

#include <cstdlib>
#include <sys/types.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <signal.h>

#include <global.h>
#include <material.h>
#include <object.h>

#include <sys/time.h>
#include <sys/resource.h>

#include <glib.h>

refcnt_base::refcnt_t refcnt_dummy;
ssize_t slice_alloc;
rand_gen rndm, rmg_rndm;

void
tausworthe_random_generator::seed (uint32_t seed)
{
  state [0] = seed      * 69069U; if (state [0] <   2U) state [0] +=   2U;
  state [1] = state [0] * 69069U; if (state [0] <   8U) state [0] +=   8U;
  state [2] = state [1] * 69069U; if (state [0] <  16U) state [0] +=  16U;
  state [3] = state [2] * 69069U; if (state [0] < 128U) state [0] += 128U;

  for (int i = 11; --i; )
    next ();
}

uint32_t
tausworthe_random_generator::next ()
{
  state [0] = ((state [0] & 0xFFFFFFFEU) << 18U) ^ (((state [0] <<  6U) ^ state [0]) >> 13U);
  state [1] = ((state [1] & 0xFFFFFFF8U) <<  2U) ^ (((state [1] <<  2U) ^ state [1]) >> 27U);
  state [2] = ((state [2] & 0xFFFFFFF0U) <<  7U) ^ (((state [2] << 13U) ^ state [2]) >> 21U);
  state [3] = ((state [3] & 0xFFFFFF80U) << 13U) ^ (((state [3] <<  3U) ^ state [3]) >> 12U);

  return state [0] ^ state [1] ^ state [2] ^ state [3];
}

template<class generator>
uint32_t
random_number_generator<generator>::get_range (uint32_t num)
{
  return (this->next () * (uint64_t)num) >> 32U;
}

// return a number within (min .. max)
template<class generator>
int 
random_number_generator<generator>::get_range (int r_min, int r_max)
{
  return r_min + get_range (max (r_max - r_min + 1, 0));
}

template struct random_number_generator<tausworthe_random_generator>;
template struct random_number_generator<xorshift_random_generator>;

/*
 * The random functions here take luck into account when rolling random
 * dice or numbers.  This function has less of an impact the larger the
 * difference becomes in the random numbers.  IE, the effect is lessened
 * on a 1-1000 roll, vs a 1-6 roll.  This can be used by crafty programmers,
 * to specifically disable luck in certain rolls, simply by making the
 * numbers larger (ie, 1d1000 > 500 vs 1d6 > 3)
 */

/*
 * Roll a random number between min and max.  Uses op to determine luck,
 * and if goodbad is non-zero, luck increases the roll, if zero, it decreases.
 * Generally, op should be the player/caster/hitter requesting the roll,
 * not the recipient (ie, the poor slob getting hit). [garbled 20010916]
 */
int
random_roll (int r_min, int r_max, const object *op, int goodbad)
{
  r_max = max (r_min, r_max);

  int base = r_max - r_min > 1 ? 20 : 50;     /* d2 and d3 are corner cases */

  if (op->type == PLAYER)
    {
      int luck = op->stats.luck;

      if (rndm (base) < min (10, abs (luck)))
        {
          //TODO: take luck into account
        }
    }

  return rndm (r_min, r_max);
}

/*
 * This is a 64 bit version of random_roll above.  This is needed
 * for exp loss calculations for players changing religions.
 */
sint64
random_roll64 (sint64 r_min, sint64 r_max, const object *op, int goodbad)
{
  sint64 omin = r_min;
  sint64 range = max (0, r_max - r_min + 1);
  int base = range > 2 ? 20 : 50;     /* d2 and d3 are corner cases */

  /* 
   * Make a call to get two 32 bit unsigned random numbers, and just to
   * a little bitshifting.
   */
  sint64 ran = (sint64) rndm.next () ^ ((sint64) rndm.next () << 31);

  if (op->type != PLAYER)
    return ((ran % range) + r_min);

  int luck = op->stats.luck;

  if (rndm (base) < min (10, abs (luck)))
    {
      /* we have a winner */
      ((luck > 0) ? (luck = 1) : (luck = -1));
      range -= luck;
      if (range < 1)
        return (omin);          /*check again */

      ((goodbad) ? (r_min += luck) : (range));

      return (max (omin, min (r_max, (ran % range) + r_min)));
    }

  return ran % range + r_min;
}

/*
 * Roll a number of dice (2d3, 4d6).  Uses op to determine luck,
 * If goodbad is non-zero, luck increases the roll, if zero, it decreases.
 * Generally, op should be the player/caster/hitter requesting the roll,
 * not the recipient (ie, the poor slob getting hit).
 * The args are num D size (ie 4d6)  [garbled 20010916]
 */
int
die_roll (int num, int size, const object *op, int goodbad)
{
  int min, luck, total, i, gotlucky;

  int diff = size;
  min = 1;
  luck = total = gotlucky = 0;
  int base = diff > 2 ? 20 : 50;     /* d2 and d3 are corner cases */

  if (size < 2 || diff < 1)
    {
      LOG (llevError, "Calling die_roll with num=%d size=%d\n", num, size);
      return num;             /* avoids a float exception */
    }

  if (op->type == PLAYER)
    luck = op->stats.luck;

  for (i = 0; i < num; i++)
    {
      if (rndm (base) < MIN (10, abs (luck)) && !gotlucky)
        {
          /* we have a winner */
          gotlucky++;
          ((luck > 0) ? (luck = 1) : (luck = -1));
          diff -= luck;
          if (diff < 1)
            return (num);       /*check again */
          ((goodbad) ? (min += luck) : (diff));
          total += MAX (1, MIN (size, rndm (diff) + min));
        }
      else
        total += rndm (size) + 1;
    }

  return total;
}

/* convert materialname to materialtype_t */

materialtype_t *
name_to_material (const shstr_cmp name)
{
  for (materialtype_t *mt = materialt; mt; mt = mt->next)
    if (name == mt->name)
      return mt;

  return 0;
}

/* when doing transmutation of objects, we have to recheck the resistances,
 * as some that did not apply previously, may apply now.
 */
void
transmute_materialname (object *op, const object *change)
{
  materialtype_t *mt;
  int j;

  if (!op->materialname)
    return;

  if (op->materialname != change->materialname)
    return;

  if (!op->is_armor ())
    return;

  mt = name_to_material (op->materialname);
  if (!mt)
    {
      LOG (llevError, "archetype '%s>%s' uses nonexistent material '%s'\n", &op->arch->archname, &op->name, &op->materialname);
      return;
    }

  for (j = 0; j < NROFATTACKS; j++)
    if (op->resist[j] == 0 && change->resist[j] != 0)
      {
        op->resist[j] += mt->mod[j];
        if (op->resist[j] > 100)
          op->resist[j] = 100;
        if (op->resist[j] < -100)
          op->resist[j] = -100;
      }
}

/* set the materialname and type for an item */
void
set_materialname (object *op, int difficulty, materialtype_t *nmt)
{
  materialtype_t *mt, *lmt;

  if (!op->materialname)
    return;

  if (nmt)
    lmt = nmt;
  else
    {
      lmt = 0;

      for (mt = materialt; mt; mt = mt->next)
        if (op->materials & mt->material && rndm (1, 100) <= mt->chance &&
            difficulty >= mt->difficulty && (op->magic >= mt->magic || mt->magic == 0))
          {
            lmt = mt;
            if (!(op->is_weapon () || op->is_armor ()))
              break;
          }
    }

  if (lmt)
    {
      if (op->stats.dam && op->is_weapon ())
        {
          op->stats.dam += lmt->damage;
          if (op->stats.dam < 1)
            op->stats.dam = 1;
        }

      if (op->stats.sp && op->type == BOW)
        op->stats.sp += lmt->sp;
      if (op->stats.wc && op->is_weapon ())
        op->stats.wc += lmt->wc;
      if (op->is_armor ())
        {
          if (op->stats.ac)
            op->stats.ac += lmt->ac;

          for (int j = 0; j < NROFATTACKS; j++)
            if (op->resist[j] != 0)
              {
                op->resist[j] += lmt->mod[j];
                if (op->resist[j] > 100)
                  op->resist[j] = 100;
                if (op->resist[j] < -100)
                  op->resist[j] = -100;
              }
        }

      op->materialname = lmt->name;
      /* dont make it unstackable if it doesn't need to be */
      if (op->is_weapon () || op->is_armor ())
        {
          op->weight = (op->weight * lmt->weight) / 100;
          op->value = (op->value * lmt->value) / 100;
        }
    }
}

/*
 * Strip out the media tags from a String.
 * Warning the input string will contain the result string
 */
void
strip_media_tag (char *message)
{
  int in_tag = 0;
  char *dest;
  char *src;

  src = dest = message;
  while (*src != '\0')
    {
      if (*src == '[')
        {
          in_tag = 1;
        }
      else if (in_tag && (*src == ']'))
        in_tag = 0;
      else if (!in_tag)
        {
          *dest = *src;
          dest++;
        }
      src++;
    }
  *dest = '\0';
}

const char *
strrstr (const char *haystack, const char *needle)
{
  const char *lastneedle;

  lastneedle = NULL;
  while ((haystack = strstr (haystack, needle)) != NULL)
    {
      lastneedle = haystack;
      haystack++;
    }
  return lastneedle;

}

#define EOL_SIZE (sizeof("\n")-1)
void
strip_endline (char *buf)
{
  if (strlen (buf) < sizeof ("\n"))
    {
      return;
    }
  if (!strcmp (buf + strlen (buf) - EOL_SIZE, "\n"))
    buf[strlen (buf) - EOL_SIZE] = '\0';
}

/**
 * Replace in string src all occurrences of key by replacement. The resulting
 * string is put into result; at most resultsize characters (including the
 * terminating null character) will be written to result.
 */
void
replace (const char *src, const char *key, const char *replacement, char *result, size_t resultsize)
{
  size_t resultlen;
  size_t keylen;

  /* special case to prevent infinite loop if key==replacement=="" */
  if (strcmp (key, replacement) == 0)
    {
      snprintf (result, resultsize, "%s", src);
      return;
    }

  keylen = strlen (key);

  resultlen = 0;
  while (*src != '\0' && resultlen + 1 < resultsize)
    {
      if (strncmp (src, key, keylen) == 0)
        {
          snprintf (result + resultlen, resultsize - resultlen, "%s", replacement);
          resultlen += strlen (result + resultlen);
          src += keylen;
        }
      else
        {
          result[resultlen++] = *src++;
        }
    }
  result[resultlen] = '\0';
}

/******************************************************************************/

/* Checks a player-provided string which will become the msg property of
 * an object for dangerous input.
 */
bool 
msg_is_safe (const char *msg)
{
  bool safe = true;

  /* Trying to cheat by getting data into the object */
  if (!strncmp (msg, "endmsg", sizeof ("endmsg") - 1)
      || strstr (msg, "\nendmsg"))
    safe = false;

  /* Trying to make the object talk, and potentially access arbitrary code */
  if (object::msg_has_dialogue (msg))
    safe = false;

  return safe;
}

/////////////////////////////////////////////////////////////////////////////

void
fork_abort (const char *msg)
{
  if (!fork ())
    {
      signal (SIGINT , SIG_IGN);
      signal (SIGTERM, SIG_IGN);
      signal (SIGABRT, SIG_IGN);

      signal (SIGSEGV, SIG_DFL);
      signal (SIGBUS , SIG_DFL);
      signal (SIGILL , SIG_DFL);
      signal (SIGTRAP, SIG_DFL);

      // try to put corefiles into a subdirectory, if existing, to allow
      // an administrator to reduce the I/O load.
      chdir ("cores");

      // try to detach us from as many external dependencies as possible
      // as coredumping can take time by closing all fd's.
      {
        struct rlimit lim;

        if (getrlimit (RLIMIT_NOFILE, &lim))
          lim.rlim_cur = 1024;

        for (int i = 0; i < lim.rlim_cur; ++i)
          close (i);
      }

      {
        sigset_t empty;
        sigemptyset (&empty);
        sigprocmask (SIG_SETMASK, &empty, 0);
      }

      // try to coredump with SIGTRAP
      kill (getpid (), SIGTRAP);
      abort ();
    }

  LOG (llevError, "fork abort: %s\n", msg);
}

void *salloc_ (int n) throw (std::bad_alloc)
{
  void *ptr = g_slice_alloc (n);

  if (!ptr)
    throw std::bad_alloc ();

  slice_alloc += n;
  return ptr;
}

void *salloc_ (int n, void *src) throw (std::bad_alloc)
{
  void *ptr = salloc_ (n);

  if (src)
    memcpy (ptr, src, n);
  else
    memset (ptr, 0, n);

  return ptr;
}

/******************************************************************************/

#if DEBUG_SALLOC

#define MAGIC 0xa1b2c35543deadLL

void *g_slice_alloc (unsigned long size)
{
  unsigned long *p = (unsigned long *) (g_slice_alloc)(size + sizeof (unsigned long));
  *p++ = size ^ MAGIC;
  //fprintf (stderr, "g_slice_alloc %ld %p\n", size, p);//D
  return (void *)p;
}

void *g_slice_alloc0 (unsigned long size)
{
  return memset (g_slice_alloc (size), 0, size);
}

void g_slice_free1 (unsigned long size, void *ptr)
{
  //fprintf (stderr, "g_slice_free %ld %p\n", size, ptr);//D
  if (expect_true (ptr))
    {
      unsigned long *p = (unsigned long *)ptr;
      unsigned long s = *--p ^ MAGIC;

      if (size != (unsigned long)(*p ^ MAGIC))
        {
          LOG (logBacktrace | llevError, "slice free size (%lx) doesn't match alloc size (%lx)\n", size, s);
          abort ();
        }

      *p = MAGIC;

      (g_slice_free1)(s + sizeof (unsigned long), p);
    }
}

#endif

/******************************************************************************/

int
assign (char *dst, const char *src, int maxsize)
{
  if (!src)
    src = "";

  int len = strlen (src);

  if (len >= maxsize)
    {
      if (maxsize <= 4)
        {
          memset (dst, '.', maxsize - 2);
          dst [maxsize - 1] = 0;
        }
      else
        {
          memcpy (dst, src, maxsize - 4);
          memcpy (dst + maxsize - 4, "...", 4);
        }

      len = maxsize;
    }
  else
    memcpy (dst, src, ++len);

  return len;
}

char *
vformat (const char *format, va_list ap)
{
  static dynbuf_text buf; buf.clear ();
  buf.vprintf (format, ap);
  return buf;
}

char *
format (const char *format, ...)
{
  va_list ap;
  va_start (ap, format);
  char *buf = vformat (format, ap);
  va_end (ap);

  return buf;
}

tstamp now ()
{
  struct timeval tv;

  gettimeofday (&tv, 0);
  return tstamp (tv.tv_sec) + tstamp (tv.tv_usec) * tstamp (1e-6);
}

int
similar_direction (int a, int b)
{
  if (!a || !b)
    return 0;

  int diff = (b - a) & 7;
  return diff <= 1 || diff >= 7;
}

/* crc32 0xdebb20e3 table and supplementary functions.  */
extern const uint32_t crc_32_tab[256] =
{
    0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
    0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL,
    0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL,
    0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL,
    0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL,
    0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL,
    0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL,
    0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
    0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL,
    0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL,
    0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL,
    0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL,
    0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL,
    0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL,
    0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL,
    0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
    0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL,
    0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL,
    0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL,
    0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL,
    0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL,
    0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL,
    0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL,
    0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
    0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL,
    0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL,
    0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL,
    0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL,
    0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL,
    0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL,
    0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL,
    0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
    0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL,
    0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL,
    0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL,
    0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL,
    0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL,
    0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL,
    0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL,
    0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
    0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL,
    0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL,
    0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL,
    0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL,
    0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL,
    0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL,
    0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL,
    0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
    0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL,
    0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL,
    0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL,
    0x2d02ef8dL
};

void thread::start (void *(*start_routine)(void *), void *arg)
{
  pthread_attr_t attr;

  pthread_attr_init (&attr);
  pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
  pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN < sizeof (long) * 4096
                                    ? sizeof (long) * 4096 : PTHREAD_STACK_MIN);
#ifdef PTHREAD_SCOPE_PROCESS
  pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
#endif

  sigset_t fullsigset, oldsigset;
  sigfillset (&fullsigset);

  pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset);

  if (pthread_create (&id, &attr, start_routine, arg))
    cleanup ("unable to create a new thread");

  pthread_sigmask (SIG_SETMASK, &oldsigset, 0);
}

Revision:	1.91
Committed:	Tue Oct 20 05:57:08 2009 UTC (14 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_82
Changes since 1.90:	+0 -39 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*
4	* Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
6	* Copyright (©) 1992,2007 Frank Tore Johansen
7	*
8	* Deliantra is free software: you can redistribute it and/or modify it under
9	* the terms of the Affero GNU General Public License as published by the
10	* Free Software Foundation, either version 3 of the License, or (at your
11	* option) any later version.
12	*
13	* This program is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	* GNU General Public License for more details.
17	*
18	* You should have received a copy of the Affero GNU General Public License
19	* and the GNU General Public License along with this program. If not, see
20	* <http://www.gnu.org/licenses/>.
21	*
22	* The authors can be reached via e-mail to <support@deliantra.net>
23	*/
24
25	/*
26	* General convenience functions for crossfire.
27	*/
28
29	#include <cstdlib>
30	#include <sys/types.h>
31	#include <unistd.h>
32	#include <sys/time.h>
33	#include <time.h>
34	#include <signal.h>
35
36	#include <global.h>
37	#include <material.h>
38	#include <object.h>
39
40	#include <sys/time.h>
41	#include <sys/resource.h>
42
43	#include <glib.h>
44
45	refcnt_base::refcnt_t refcnt_dummy;
46	ssize_t slice_alloc;
47	rand_gen rndm, rmg_rndm;
48
49	void
50	tausworthe_random_generator::seed (uint32_t seed)
51	{
52	state [0] = seed * 69069U; if (state [0] < 2U) state [0] += 2U;
53	state [1] = state [0] * 69069U; if (state [0] < 8U) state [0] += 8U;
54	state [2] = state [1] * 69069U; if (state [0] < 16U) state [0] += 16U;
55	state [3] = state [2] * 69069U; if (state [0] < 128U) state [0] += 128U;
56
57	for (int i = 11; --i; )
58	next ();
59	}
60
61	uint32_t
62	tausworthe_random_generator::next ()
63	{
64	state [0] = ((state [0] & 0xFFFFFFFEU) << 18U) ^ (((state [0] << 6U) ^ state [0]) >> 13U);
65	state [1] = ((state [1] & 0xFFFFFFF8U) << 2U) ^ (((state [1] << 2U) ^ state [1]) >> 27U);
66	state [2] = ((state [2] & 0xFFFFFFF0U) << 7U) ^ (((state [2] << 13U) ^ state [2]) >> 21U);
67	state [3] = ((state [3] & 0xFFFFFF80U) << 13U) ^ (((state [3] << 3U) ^ state [3]) >> 12U);
68
69	return state [0] ^ state [1] ^ state [2] ^ state [3];
70	}
71
72	template<class generator>
73	uint32_t
74	random_number_generator<generator>::get_range (uint32_t num)
75	{
76	return (this->next () * (uint64_t)num) >> 32U;
77	}
78
79	// return a number within (min .. max)
80	template<class generator>
81	int
82	random_number_generator<generator>::get_range (int r_min, int r_max)
83	{
84	return r_min + get_range (max (r_max - r_min + 1, 0));
85	}
86
87	template struct random_number_generator<tausworthe_random_generator>;
88	template struct random_number_generator<xorshift_random_generator>;
89
90	/*
91	* The random functions here take luck into account when rolling random
92	* dice or numbers. This function has less of an impact the larger the
93	* difference becomes in the random numbers. IE, the effect is lessened
94	* on a 1-1000 roll, vs a 1-6 roll. This can be used by crafty programmers,
95	* to specifically disable luck in certain rolls, simply by making the
96	* numbers larger (ie, 1d1000 > 500 vs 1d6 > 3)
97	*/
98
99	/*
100	* Roll a random number between min and max. Uses op to determine luck,
101	* and if goodbad is non-zero, luck increases the roll, if zero, it decreases.
102	* Generally, op should be the player/caster/hitter requesting the roll,
103	* not the recipient (ie, the poor slob getting hit). [garbled 20010916]
104	*/
105	int
106	random_roll (int r_min, int r_max, const object *op, int goodbad)
107	{
108	r_max = max (r_min, r_max);
109
110	int base = r_max - r_min > 1 ? 20 : 50; /* d2 and d3 are corner cases */
111
112	if (op->type == PLAYER)
113	{
114	int luck = op->stats.luck;
115
116	if (rndm (base) < min (10, abs (luck)))
117	{
118	//TODO: take luck into account
119	}
120	}
121
122	return rndm (r_min, r_max);
123	}
124
125	/*
126	* This is a 64 bit version of random_roll above. This is needed
127	* for exp loss calculations for players changing religions.
128	*/
129	sint64
130	random_roll64 (sint64 r_min, sint64 r_max, const object *op, int goodbad)
131	{
132	sint64 omin = r_min;
133	sint64 range = max (0, r_max - r_min + 1);
134	int base = range > 2 ? 20 : 50; /* d2 and d3 are corner cases */
135
136	/*
137	* Make a call to get two 32 bit unsigned random numbers, and just to
138	* a little bitshifting.
139	*/
140	sint64 ran = (sint64) rndm.next () ^ ((sint64) rndm.next () << 31);
141
142	if (op->type != PLAYER)
143	return ((ran % range) + r_min);
144
145	int luck = op->stats.luck;
146
147	if (rndm (base) < min (10, abs (luck)))
148	{
149	/* we have a winner */
150	((luck > 0) ? (luck = 1) : (luck = -1));
151	range -= luck;
152	if (range < 1)
153	return (omin); /check again /
154
155	((goodbad) ? (r_min += luck) : (range));
156
157	return (max (omin, min (r_max, (ran % range) + r_min)));
158	}
159
160	return ran % range + r_min;
161	}
162
163	/*
164	* Roll a number of dice (2d3, 4d6). Uses op to determine luck,
165	* If goodbad is non-zero, luck increases the roll, if zero, it decreases.
166	* Generally, op should be the player/caster/hitter requesting the roll,
167	* not the recipient (ie, the poor slob getting hit).
168	* The args are num D size (ie 4d6) [garbled 20010916]
169	*/
170	int
171	die_roll (int num, int size, const object *op, int goodbad)
172	{
173	int min, luck, total, i, gotlucky;
174
175	int diff = size;
176	min = 1;
177	luck = total = gotlucky = 0;
178	int base = diff > 2 ? 20 : 50; /* d2 and d3 are corner cases */
179
180	if (size < 2 \|\| diff < 1)
181	{
182	LOG (llevError, "Calling die_roll with num=%d size=%d\n", num, size);
183	return num; /* avoids a float exception */
184	}
185
186	if (op->type == PLAYER)
187	luck = op->stats.luck;
188
189	for (i = 0; i < num; i++)
190	{
191	if (rndm (base) < MIN (10, abs (luck)) && !gotlucky)
192	{
193	/* we have a winner */
194	gotlucky++;
195	((luck > 0) ? (luck = 1) : (luck = -1));
196	diff -= luck;
197	if (diff < 1)
198	return (num); /check again /
199	((goodbad) ? (min += luck) : (diff));
200	total += MAX (1, MIN (size, rndm (diff) + min));
201	}
202	else
203	total += rndm (size) + 1;
204	}
205
206	return total;
207	}
208
209	/* convert materialname to materialtype_t */
210
211	materialtype_t *
212	name_to_material (const shstr_cmp name)
213	{
214	for (materialtype_t *mt = materialt; mt; mt = mt->next)
215	if (name == mt->name)
216	return mt;
217
218	return 0;
219	}
220
221	/* when doing transmutation of objects, we have to recheck the resistances,
222	* as some that did not apply previously, may apply now.
223	*/
224	void
225	transmute_materialname (object op, const object change)
226	{
227	materialtype_t *mt;
228	int j;
229
230	if (!op->materialname)
231	return;
232
233	if (op->materialname != change->materialname)
234	return;
235
236	if (!op->is_armor ())
237	return;
238
239	mt = name_to_material (op->materialname);
240	if (!mt)
241	{
242	LOG (llevError, "archetype '%s>%s' uses nonexistent material '%s'\n", &op->arch->archname, &op->name, &op->materialname);
243	return;
244	}
245
246	for (j = 0; j < NROFATTACKS; j++)
247	if (op->resist[j] == 0 && change->resist[j] != 0)
248	{
249	op->resist[j] += mt->mod[j];
250	if (op->resist[j] > 100)
251	op->resist[j] = 100;
252	if (op->resist[j] < -100)
253	op->resist[j] = -100;
254	}
255	}
256
257	/* set the materialname and type for an item */
258	void
259	set_materialname (object op, int difficulty, materialtype_t nmt)
260	{
261	materialtype_t mt, lmt;
262
263	if (!op->materialname)
264	return;
265
266	if (nmt)
267	lmt = nmt;
268	else
269	{
270	lmt = 0;
271
272	for (mt = materialt; mt; mt = mt->next)
273	if (op->materials & mt->material && rndm (1, 100) <= mt->chance &&
274	difficulty >= mt->difficulty && (op->magic >= mt->magic \|\| mt->magic == 0))
275	{
276	lmt = mt;
277	if (!(op->is_weapon () \|\| op->is_armor ()))
278	break;
279	}
280	}
281
282	if (lmt)
283	{
284	if (op->stats.dam && op->is_weapon ())
285	{
286	op->stats.dam += lmt->damage;
287	if (op->stats.dam < 1)
288	op->stats.dam = 1;
289	}
290
291	if (op->stats.sp && op->type == BOW)
292	op->stats.sp += lmt->sp;
293	if (op->stats.wc && op->is_weapon ())
294	op->stats.wc += lmt->wc;
295	if (op->is_armor ())
296	{
297	if (op->stats.ac)
298	op->stats.ac += lmt->ac;
299
300	for (int j = 0; j < NROFATTACKS; j++)
301	if (op->resist[j] != 0)
302	{
303	op->resist[j] += lmt->mod[j];
304	if (op->resist[j] > 100)
305	op->resist[j] = 100;
306	if (op->resist[j] < -100)
307	op->resist[j] = -100;
308	}
309	}
310
311	op->materialname = lmt->name;
312	/* dont make it unstackable if it doesn't need to be */
313	if (op->is_weapon () \|\| op->is_armor ())
314	{
315	op->weight = (op->weight * lmt->weight) / 100;
316	op->value = (op->value * lmt->value) / 100;
317	}
318	}
319	}
320
321	/*
322	* Strip out the media tags from a String.
323	* Warning the input string will contain the result string
324	*/
325	void
326	strip_media_tag (char *message)
327	{
328	int in_tag = 0;
329	char *dest;
330	char *src;
331
332	src = dest = message;
333	while (*src != '\0')
334	{
335	if (*src == '[')
336	{
337	in_tag = 1;
338	}
339	else if (in_tag && (*src == ']'))
340	in_tag = 0;
341	else if (!in_tag)
342	{
343	dest = src;
344	dest++;
345	}
346	src++;
347	}
348	*dest = '\0';
349	}
350
351	const char *
352	strrstr (const char haystack, const char needle)
353	{
354	const char *lastneedle;
355
356	lastneedle = NULL;
357	while ((haystack = strstr (haystack, needle)) != NULL)
358	{
359	lastneedle = haystack;
360	haystack++;
361	}
362	return lastneedle;
363
364	}
365
366	#define EOL_SIZE (sizeof("\n")-1)
367	void
368	strip_endline (char *buf)
369	{
370	if (strlen (buf) < sizeof ("\n"))
371	{
372	return;
373	}
374	if (!strcmp (buf + strlen (buf) - EOL_SIZE, "\n"))
375	buf[strlen (buf) - EOL_SIZE] = '\0';
376	}
377
378	/**
379	* Replace in string src all occurrences of key by replacement. The resulting
380	* string is put into result; at most resultsize characters (including the
381	* terminating null character) will be written to result.
382	*/
383	void
384	replace (const char src, const char key, const char replacement, char result, size_t resultsize)
385	{
386	size_t resultlen;
387	size_t keylen;
388
389	/* special case to prevent infinite loop if key==replacement=="" */
390	if (strcmp (key, replacement) == 0)
391	{
392	snprintf (result, resultsize, "%s", src);
393	return;
394	}
395
396	keylen = strlen (key);
397
398	resultlen = 0;
399	while (*src != '\0' && resultlen + 1 < resultsize)
400	{
401	if (strncmp (src, key, keylen) == 0)
402	{
403	snprintf (result + resultlen, resultsize - resultlen, "%s", replacement);
404	resultlen += strlen (result + resultlen);
405	src += keylen;
406	}
407	else
408	{
409	result[resultlen++] = *src++;
410	}
411	}
412	result[resultlen] = '\0';
413	}
414
415	/******************************************************************************/
416
417	/* Checks a player-provided string which will become the msg property of
418	* an object for dangerous input.
419	*/
420	bool
421	msg_is_safe (const char *msg)
422	{
423	bool safe = true;
424
425	/* Trying to cheat by getting data into the object */
426	if (!strncmp (msg, "endmsg", sizeof ("endmsg") - 1)
427	\|\| strstr (msg, "\nendmsg"))
428	safe = false;
429
430	/* Trying to make the object talk, and potentially access arbitrary code */
431	if (object::msg_has_dialogue (msg))
432	safe = false;
433
434	return safe;
435	}
436
437	/////////////////////////////////////////////////////////////////////////////
438
439	void
440	fork_abort (const char *msg)
441	{
442	if (!fork ())
443	{
444	signal (SIGINT , SIG_IGN);
445	signal (SIGTERM, SIG_IGN);
446	signal (SIGABRT, SIG_IGN);
447
448	signal (SIGSEGV, SIG_DFL);
449	signal (SIGBUS , SIG_DFL);
450	signal (SIGILL , SIG_DFL);
451	signal (SIGTRAP, SIG_DFL);
452
453	// try to put corefiles into a subdirectory, if existing, to allow
454	// an administrator to reduce the I/O load.
455	chdir ("cores");
456
457	// try to detach us from as many external dependencies as possible
458	// as coredumping can take time by closing all fd's.
459	{
460	struct rlimit lim;
461
462	if (getrlimit (RLIMIT_NOFILE, &lim))
463	lim.rlim_cur = 1024;
464
465	for (int i = 0; i < lim.rlim_cur; ++i)
466	close (i);
467	}
468
469	{
470	sigset_t empty;
471	sigemptyset (&empty);
472	sigprocmask (SIG_SETMASK, &empty, 0);
473	}
474
475	// try to coredump with SIGTRAP
476	kill (getpid (), SIGTRAP);
477	abort ();
478	}
479
480	LOG (llevError, "fork abort: %s\n", msg);
481	}
482
483	void *salloc_ (int n) throw (std::bad_alloc)
484	{
485	void *ptr = g_slice_alloc (n);
486
487	if (!ptr)
488	throw std::bad_alloc ();
489
490	slice_alloc += n;
491	return ptr;
492	}
493
494	void salloc_ (int n, void src) throw (std::bad_alloc)
495	{
496	void *ptr = salloc_ (n);
497
498	if (src)
499	memcpy (ptr, src, n);
500	else
501	memset (ptr, 0, n);
502
503	return ptr;
504	}
505
506	/******************************************************************************/
507
508	#if DEBUG_SALLOC
509
510	#define MAGIC 0xa1b2c35543deadLL
511
512	void *g_slice_alloc (unsigned long size)
513	{
514	unsigned long p = (unsigned long ) (g_slice_alloc)(size + sizeof (unsigned long));
515	*p++ = size ^ MAGIC;
516	//fprintf (stderr, "g_slice_alloc %ld %p\n", size, p);//D
517	return (void *)p;
518	}
519
520	void *g_slice_alloc0 (unsigned long size)
521	{
522	return memset (g_slice_alloc (size), 0, size);
523	}
524
525	void g_slice_free1 (unsigned long size, void *ptr)
526	{
527	//fprintf (stderr, "g_slice_free %ld %p\n", size, ptr);//D
528	if (expect_true (ptr))
529	{
530	unsigned long p = (unsigned long )ptr;
531	unsigned long s = *--p ^ MAGIC;
532
533	if (size != (unsigned long)(*p ^ MAGIC))
534	{
535	LOG (logBacktrace \| llevError, "slice free size (%lx) doesn't match alloc size (%lx)\n", size, s);
536	abort ();
537	}
538
539	*p = MAGIC;
540
541	(g_slice_free1)(s + sizeof (unsigned long), p);
542	}
543	}
544
545	#endif
546
547	/******************************************************************************/
548
549	int
550	assign (char dst, const char src, int maxsize)
551	{
552	if (!src)
553	src = "";
554
555	int len = strlen (src);
556
557	if (len >= maxsize)
558	{
559	if (maxsize <= 4)
560	{
561	memset (dst, '.', maxsize - 2);
562	dst [maxsize - 1] = 0;
563	}
564	else
565	{
566	memcpy (dst, src, maxsize - 4);
567	memcpy (dst + maxsize - 4, "...", 4);
568	}
569
570	len = maxsize;
571	}
572	else
573	memcpy (dst, src, ++len);
574
575	return len;
576	}
577
578	char *
579	vformat (const char *format, va_list ap)
580	{
581	static dynbuf_text buf; buf.clear ();
582	buf.vprintf (format, ap);
583	return buf;
584	}
585
586	char *
587	format (const char *format, ...)
588	{
589	va_list ap;
590	va_start (ap, format);
591	char *buf = vformat (format, ap);
592	va_end (ap);
593
594	return buf;
595	}
596
597	tstamp now ()
598	{
599	struct timeval tv;
600
601	gettimeofday (&tv, 0);
602	return tstamp (tv.tv_sec) + tstamp (tv.tv_usec) * tstamp (1e-6);
603	}
604
605	int
606	similar_direction (int a, int b)
607	{
608	if (!a \|\| !b)
609	return 0;
610
611	int diff = (b - a) & 7;
612	return diff <= 1 \|\| diff >= 7;
613	}
614
615	/* crc32 0xdebb20e3 table and supplementary functions. */
616	extern const uint32_t crc_32_tab[256] =
617	{
618	0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
619	0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL,
620	0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL,
621	0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL,
622	0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL,
623	0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL,
624	0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL,
625	0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
626	0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL,
627	0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL,
628	0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL,
629	0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL,
630	0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL,
631	0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL,
632	0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL,
633	0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
634	0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL,
635	0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL,
636	0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL,
637	0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL,
638	0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL,
639	0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL,
640	0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL,
641	0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
642	0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL,
643	0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL,
644	0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL,
645	0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL,
646	0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL,
647	0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL,
648	0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL,
649	0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
650	0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL,
651	0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL,
652	0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL,
653	0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL,
654	0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL,
655	0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL,
656	0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL,
657	0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
658	0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL,
659	0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL,
660	0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL,
661	0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL,
662	0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL,
663	0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL,
664	0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL,
665	0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
666	0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL,
667	0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL,
668	0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL,
669	0x2d02ef8dL
670	};
671
672	void thread::start (void (start_routine)(void ), void arg)
673	{
674	pthread_attr_t attr;
675
676	pthread_attr_init (&attr);
677	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
678	pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN < sizeof (long) * 4096
679	? sizeof (long) * 4096 : PTHREAD_STACK_MIN);
680	#ifdef PTHREAD_SCOPE_PROCESS
681	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
682	#endif
683
684	sigset_t fullsigset, oldsigset;
685	sigfillset (&fullsigset);
686
687	pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset);
688
689	if (pthread_create (&id, &attr, start_routine, arg))
690	cleanup ("unable to create a new thread");
691
692	pthread_sigmask (SIG_SETMASK, &oldsigset, 0);
693	}
694