server/common/utils.C

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
    Copyright (C) 2002 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 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 GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    The authors can be reached via e-mail at <crossfire@schmorp.de>
*/

/*
 * General convenience functions for crossfire.
 */

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

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

/*
 * 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 min, int max, const object *op, int goodbad)
{
  int omin, diff, luck, base, ran;

  omin = min;
  diff = max - min + 1;
  ((diff > 2) ? (base = 20) : (base = 50));     /* d2 and d3 are corner cases */

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

  ran = RANDOM ();

  if (op->type != PLAYER)
    return ((ran % diff) + min);

  luck = op->stats.luck;
  if (RANDOM () % base < MIN (10, abs (luck)))
    {
      /* we have a winner */
      ((luck > 0) ? (luck = 1) : (luck = -1));
      diff -= luck;
      if (diff < 1)
        return (omin);          /*check again */
      ((goodbad) ? (min += luck) : (diff));

      return (MAX (omin, MIN (max, (ran % diff) + min)));
    }
  return ((ran % diff) + min);
}

/*
 * 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 min, sint64 max, const object *op, int goodbad)
{
  sint64 omin, diff, luck, ran;
  int base;

  omin = min;
  diff = max - min + 1;
  ((diff > 2) ? (base = 20) : (base = 50));     /* d2 and d3 are corner cases */

  if (max < 1 || diff < 1)
    {
      LOG (llevError, "Calling random_roll with min=%" PRId64 " max=%" PRId64 "\n", min, max);
      return (min);             /* avoids a float exception */
    }

  /* Don't know of a portable call to get 64 bit random values.
   * So make a call to get two 32 bit random numbers, and just to
   * a little byteshifting.  Do make sure the first one is only
   * 32 bit, so we don't get skewed results
   */
  ran = (RANDOM () & 0xffffffff) | ((sint64) RANDOM () << 32);

  if (op->type != PLAYER)
    return ((ran % diff) + min);

  luck = op->stats.luck;
  if (RANDOM () % base < MIN (10, abs (luck)))
    {
      /* we have a winner */
      ((luck > 0) ? (luck = 1) : (luck = -1));
      diff -= luck;
      if (diff < 1)
        return (omin);          /*check again */
      ((goodbad) ? (min += luck) : (diff));

      return (MAX (omin, MIN (max, (ran % diff) + min)));
    }
  return ((ran % diff) + 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, diff, luck, total, i, gotlucky, base, ran;

  diff = size;
  min = 1;
  luck = total = gotlucky = 0;
  ((diff > 2) ? (base = 20) : (base = 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 (RANDOM () % 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));
          ran = RANDOM ();
          total += MAX (1, MIN (size, (ran % diff) + min));
        }
      else
        {
          total += RANDOM () % size + 1;
        }
    }
  return (total);
}

/*
 * Another convenience function.  Returns a number between min and max.
 * It is suggested one use these functions rather than RANDOM()%, as it
 * would appear that a number of off-by-one-errors exist due to improper
 * use of %.  This should also prevent SIGFPE.
 */

int
rndm (int min, int max)
{
  int diff;

  diff = max - min + 1;
  if (max < 1 || diff < 1)
    return (min);

  return (RANDOM () % diff + min);
}

/* decay and destroy perishable items in a map */
void
maptile::decay_objects ()
{
  if (!spaces)
    return;

  for (mapspace *ms = spaces + size (); ms-- > spaces; )
    for (object *above, *op = ms->bot; op; op = above)
      {
        above = op->above;

        bool destroy = 0;

        // do not decay anything above unique floor tiles (yet :)
        if (QUERY_FLAG (op, FLAG_IS_FLOOR) && QUERY_FLAG (op, FLAG_UNIQUE))
          break;

        if (QUERY_FLAG (op, FLAG_IS_FLOOR)
            || QUERY_FLAG (op, FLAG_OBJ_ORIGINAL)
            || QUERY_FLAG (op, FLAG_OBJ_SAVE_ON_OVL)
            || QUERY_FLAG (op, FLAG_UNIQUE)
            || QUERY_FLAG (op, FLAG_OVERLAY_FLOOR)
            || QUERY_FLAG (op, FLAG_UNPAID)
            || op->is_alive ())
          ; // do not decay
        else if (op->is_weapon ())
          {
            op->stats.dam--;
            if (op->stats.dam < 0)
              destroy = 1;
          }
        else if (op->is_armor ())
          {
            op->stats.ac--;
            if (op->stats.ac < 0)
              destroy = 1;
          }
        else if (op->type == FOOD)
          {
            op->stats.food -= rndm (5, 20);
            if (op->stats.food < 0)
              destroy = 1;
          }
        else
          {
            int mat = op->material;

            if (mat & M_PAPER
                || mat & M_LEATHER
                || mat & M_WOOD
                || mat & M_ORGANIC
                || mat & M_CLOTH
                || mat & M_LIQUID
                || (mat & M_IRON  && rndm (1, 5) == 1)
                || (mat & M_GLASS && rndm (1, 2) == 1)
                || ((mat & M_STONE      || mat & M_ADAMANT) && rndm (1, 10) == 1)
                || ((mat & M_SOFT_METAL || mat & M_BONE)    && rndm (1, 3)  == 1)
                || (mat & M_ICE && temp > 32))
              destroy = 1;
          }

        /* adjust overall chance below */
        if (destroy && rndm (0, 1))
          op->destroy ();
      }
}

/* convert materialname to materialtype_t */

materialtype_t *
name_to_material (const char *name)
{
  materialtype_t *mt, *nmt;

  mt = NULL;
  for (nmt = materialt; nmt != NULL && nmt->next != NULL; nmt = nmt->next)
    {
      if (strcmp (name, nmt->name) == 0)
        {
          mt = nmt;
          break;
        }
    }
  return mt;
}

/* 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 == NULL)
    return;

  if (change->materialname != NULL && strcmp (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->name, &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;

#ifdef NEW_MATERIAL_CODE
  int j;
#endif

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


  if (nmt == NULL)
    {
      lmt = NULL;
#ifndef NEW_MATERIAL_CODE
      for (mt = materialt; mt != NULL && mt->next != NULL; mt = mt->next)
        {
          if (op->material & mt->material)
            {
              lmt = mt;
              break;
            }
        }

#else
      for (mt = materialt; mt != NULL && mt->next != NULL; mt = mt->next)
        {
          if (op->material & 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;
            }
        }
#endif
    }
  else
    {
      lmt = nmt;
    }

  if (lmt != NULL)
    {
#ifndef NEW_MATERIAL_CODE
      op->materialname = lmt->name;
      return;
#else

      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 (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 = add_string (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;
        }
#endif
    }
}

/*
 * 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';
}

/**
 * Taking a string as an argument, mutate it into a string that looks like a list.
 * a 'list' for the purposes here, is a string of items, seperated by commas, except
 * for the last entry, which has an 'and' before it, and a full stop (period) after it.
 * This function will also strip all trailing non alphanumeric characters.
 * It does not insert an oxford comma.
 */

void
make_list_like (char *input)
{
  char *p, tmp[MAX_BUF];
  int i;

  if (!input || strlen (input) > MAX_BUF - 5)
    return;
  /* bad stuff would happen if we continued here, the -5 is to make space for ' and ' */

  strncpy (tmp, input, MAX_BUF - 5);
  /*trim all trailing commas, spaces etc. */
  for (i = strlen (tmp); !isalnum (tmp[i]) && i >= 0; i--)
    tmp[i] = '\0';

  strcat (tmp, ".");

  p = strrchr (tmp, ',');
  if (p)
    {
      *p = '\0';
      strcpy (input, tmp);
      p++;
      strcat (input, " and");
      strcat (input, p);
    }
  else
    strcpy (input, tmp);

  return;
}

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

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

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

  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;
}

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

  int len = strlen (src);

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

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;
}

Revision:	1.36
Committed:	Sat Jan 6 14:42:29 2007 UTC (17 years, 4 months ago) by pippijn
Content type:	text/plain
Branch:	MAIN
Changes since 1.35:	+1 -0 lines
Log Message:	added some copyrights
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4	pippijn	1.36	Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
5	elmex	1.1	Copyright (C) 2002 Mark Wedel & Crossfire Development Team
6			Copyright (C) 1992 Frank Tore Johansen
7
8			This program is free software; you can redistribute it and/or modify
9			it under the terms of the GNU General Public License as published by
10			the Free Software Foundation; either version 2 of the License, or
11			(at your 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 GNU General Public License
19			along with this program; if not, write to the Free Software
20			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21
22	root	1.15	The authors can be reached via e-mail at <crossfire@schmorp.de>
23	elmex	1.1	*/
24
25			/*
26			* General convenience functions for crossfire.
27			*/
28
29			#include <global.h>
30			#include <funcpoint.h>
31			#include <material.h>
32
33	root	1.23	#include <sys/time.h>
34			#include <time.h>
35	root	1.4	#include <glib.h>
36
37	elmex	1.1	/*
38			* The random functions here take luck into account when rolling random
39			* dice or numbers. This function has less of an impact the larger the
40			* difference becomes in the random numbers. IE, the effect is lessened
41			* on a 1-1000 roll, vs a 1-6 roll. This can be used by crafty programmers,
42			* to specifically disable luck in certain rolls, simply by making the
43			* numbers larger (ie, 1d1000 > 500 vs 1d6 > 3)
44			*/
45
46			/*
47			* Roll a random number between min and max. Uses op to determine luck,
48			* and if goodbad is non-zero, luck increases the roll, if zero, it decreases.
49			* Generally, op should be the player/caster/hitter requesting the roll,
50			* not the recipient (ie, the poor slob getting hit). [garbled 20010916]
51			*/
52
53	root	1.9	int
54			random_roll (int min, int max, const object *op, int goodbad)
55			{
56			int omin, diff, luck, base, ran;
57	elmex	1.1
58	root	1.9	omin = min;
59			diff = max - min + 1;
60			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
61	elmex	1.1
62	root	1.9	if (max < 1 \|\| diff < 1)
63			{
64			LOG (llevError, "Calling random_roll with min=%d max=%d\n", min, max);
65			return (min); /* avoids a float exception */
66	elmex	1.1	}
67
68	root	1.9	ran = RANDOM ();
69	elmex	1.1
70	root	1.9	if (op->type != PLAYER)
71			return ((ran % diff) + min);
72	elmex	1.1
73	root	1.9	luck = op->stats.luck;
74			if (RANDOM () % base < MIN (10, abs (luck)))
75			{
76			/* we have a winner */
77			((luck > 0) ? (luck = 1) : (luck = -1));
78			diff -= luck;
79			if (diff < 1)
80			return (omin); /check again /
81			((goodbad) ? (min += luck) : (diff));
82	elmex	1.1
83	root	1.9	return (MAX (omin, MIN (max, (ran % diff) + min)));
84	elmex	1.1	}
85	root	1.9	return ((ran % diff) + min);
86	elmex	1.1	}
87
88			/*
89			* This is a 64 bit version of random_roll above. This is needed
90			* for exp loss calculations for players changing religions.
91			*/
92
93	root	1.9	sint64
94			random_roll64 (sint64 min, sint64 max, const object *op, int goodbad)
95			{
96			sint64 omin, diff, luck, ran;
97			int base;
98
99			omin = min;
100			diff = max - min + 1;
101			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
102	elmex	1.1
103	root	1.9	if (max < 1 \|\| diff < 1)
104			{
105	root	1.20	LOG (llevError, "Calling random_roll with min=%" PRId64 " max=%" PRId64 "\n", min, max);
106	root	1.9	return (min); /* avoids a float exception */
107	elmex	1.1	}
108
109	root	1.9	/* Don't know of a portable call to get 64 bit random values.
110			* So make a call to get two 32 bit random numbers, and just to
111			* a little byteshifting. Do make sure the first one is only
112			* 32 bit, so we don't get skewed results
113			*/
114			ran = (RANDOM () & 0xffffffff) \| ((sint64) RANDOM () << 32);
115
116			if (op->type != PLAYER)
117			return ((ran % diff) + min);
118
119			luck = op->stats.luck;
120			if (RANDOM () % base < MIN (10, abs (luck)))
121			{
122			/* we have a winner */
123			((luck > 0) ? (luck = 1) : (luck = -1));
124			diff -= luck;
125			if (diff < 1)
126			return (omin); /check again /
127			((goodbad) ? (min += luck) : (diff));
128	elmex	1.1
129	root	1.9	return (MAX (omin, MIN (max, (ran % diff) + min)));
130	elmex	1.1	}
131	root	1.9	return ((ran % diff) + min);
132	elmex	1.1	}
133
134			/*
135			* Roll a number of dice (2d3, 4d6). Uses op to determine luck,
136			* If goodbad is non-zero, luck increases the roll, if zero, it decreases.
137			* Generally, op should be the player/caster/hitter requesting the roll,
138			* not the recipient (ie, the poor slob getting hit).
139			* The args are num D size (ie 4d6) [garbled 20010916]
140			*/
141
142	root	1.9	int
143			die_roll (int num, int size, const object *op, int goodbad)
144			{
145			int min, diff, luck, total, i, gotlucky, base, ran;
146
147			diff = size;
148			min = 1;
149			luck = total = gotlucky = 0;
150			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
151			if (size < 2 \|\| diff < 1)
152			{
153			LOG (llevError, "Calling die_roll with num=%d size=%d\n", num, size);
154			return (num); /* avoids a float exception */
155			}
156	elmex	1.1
157	root	1.9	if (op->type == PLAYER)
158			luck = op->stats.luck;
159
160			for (i = 0; i < num; i++)
161			{
162			if (RANDOM () % base < MIN (10, abs (luck)) && !gotlucky)
163			{
164			/* we have a winner */
165			gotlucky++;
166			((luck > 0) ? (luck = 1) : (luck = -1));
167			diff -= luck;
168			if (diff < 1)
169			return (num); /check again /
170			((goodbad) ? (min += luck) : (diff));
171			ran = RANDOM ();
172			total += MAX (1, MIN (size, (ran % diff) + min));
173			}
174			else
175			{
176			total += RANDOM () % size + 1;
177	root	1.2	}
178	elmex	1.1	}
179	root	1.9	return (total);
180	elmex	1.1	}
181
182			/*
183			* Another convenience function. Returns a number between min and max.
184			* It is suggested one use these functions rather than RANDOM()%, as it
185			* would appear that a number of off-by-one-errors exist due to improper
186			* use of %. This should also prevent SIGFPE.
187			*/
188
189	root	1.9	int
190			rndm (int min, int max)
191	elmex	1.1	{
192			int diff;
193
194			diff = max - min + 1;
195			if (max < 1 \|\| diff < 1)
196	root	1.9	return (min);
197	elmex	1.1
198	root	1.9	return (RANDOM () % diff + min);
199	elmex	1.1	}
200
201	root	1.33	/* decay and destroy perishable items in a map */
202	root	1.9	void
203	root	1.32	maptile::decay_objects ()
204	elmex	1.1	{
205	root	1.35	if (!spaces)
206			return;
207
208			for (mapspace *ms = spaces + size (); ms-- > spaces; )
209			for (object above, op = ms->bot; op; op = above)
210			{
211			above = op->above;
212
213			bool destroy = 0;
214	root	1.32
215	root	1.35	// do not decay anything above unique floor tiles (yet :)
216			if (QUERY_FLAG (op, FLAG_IS_FLOOR) && QUERY_FLAG (op, FLAG_UNIQUE))
217			break;
218	root	1.32
219	root	1.35	if (QUERY_FLAG (op, FLAG_IS_FLOOR)
220			\|\| QUERY_FLAG (op, FLAG_OBJ_ORIGINAL)
221			\|\| QUERY_FLAG (op, FLAG_OBJ_SAVE_ON_OVL)
222			\|\| QUERY_FLAG (op, FLAG_UNIQUE)
223			\|\| QUERY_FLAG (op, FLAG_OVERLAY_FLOOR)
224			\|\| QUERY_FLAG (op, FLAG_UNPAID)
225			\|\| op->is_alive ())
226			; // do not decay
227			else if (op->is_weapon ())
228			{
229			op->stats.dam--;
230			if (op->stats.dam < 0)
231			destroy = 1;
232			}
233			else if (op->is_armor ())
234			{
235			op->stats.ac--;
236			if (op->stats.ac < 0)
237			destroy = 1;
238			}
239			else if (op->type == FOOD)
240			{
241			op->stats.food -= rndm (5, 20);
242			if (op->stats.food < 0)
243			destroy = 1;
244			}
245			else
246			{
247			int mat = op->material;
248
249			if (mat & M_PAPER
250			\|\| mat & M_LEATHER
251			\|\| mat & M_WOOD
252			\|\| mat & M_ORGANIC
253			\|\| mat & M_CLOTH
254			\|\| mat & M_LIQUID
255			\|\| (mat & M_IRON && rndm (1, 5) == 1)
256			\|\| (mat & M_GLASS && rndm (1, 2) == 1)
257			\|\| ((mat & M_STONE \|\| mat & M_ADAMANT) && rndm (1, 10) == 1)
258			\|\| ((mat & M_SOFT_METAL \|\| mat & M_BONE) && rndm (1, 3) == 1)
259			\|\| (mat & M_ICE && temp > 32))
260			destroy = 1;
261			}
262
263			/* adjust overall chance below */
264			if (destroy && rndm (0, 1))
265			op->destroy ();
266			}
267	elmex	1.1	}
268
269			/* convert materialname to materialtype_t */
270
271	root	1.9	materialtype_t *
272			name_to_material (const char *name)
273	elmex	1.1	{
274	root	1.9	materialtype_t mt, nmt;
275	elmex	1.1
276	root	1.9	mt = NULL;
277			for (nmt = materialt; nmt != NULL && nmt->next != NULL; nmt = nmt->next)
278			{
279			if (strcmp (name, nmt->name) == 0)
280			{
281			mt = nmt;
282			break;
283	root	1.2	}
284	elmex	1.1	}
285	root	1.9	return mt;
286	elmex	1.1	}
287
288			/* when doing transmutation of objects, we have to recheck the resistances,
289			* as some that did not apply previously, may apply now.
290			*/
291
292	root	1.9	void
293			transmute_materialname (object op, const object change)
294	elmex	1.1	{
295	root	1.9	materialtype_t *mt;
296			int j;
297	elmex	1.1
298	root	1.9	if (op->materialname == NULL)
299			return;
300	elmex	1.1
301	root	1.9	if (change->materialname != NULL && strcmp (op->materialname, change->materialname))
302			return;
303
304	root	1.26	if (!op->is_armor ())
305	root	1.9	return;
306
307			mt = name_to_material (op->materialname);
308			if (!mt)
309			{
310			LOG (llevError, "archetype '%s>%s' uses nonexistent material '%s'\n", &op->arch->name, &op->name, &op->materialname);
311			return;
312			}
313
314			for (j = 0; j < NROFATTACKS; j++)
315			if (op->resist[j] == 0 && change->resist[j] != 0)
316			{
317			op->resist[j] += mt->mod[j];
318			if (op->resist[j] > 100)
319			op->resist[j] = 100;
320			if (op->resist[j] < -100)
321			op->resist[j] = -100;
322			}
323	elmex	1.1	}
324
325			/* set the materialname and type for an item */
326	root	1.9	void
327			set_materialname (object op, int difficulty, materialtype_t nmt)
328	elmex	1.1	{
329	root	1.9	materialtype_t mt, lmt;
330
331	pippijn	1.5	#ifdef NEW_MATERIAL_CODE
332	root	1.9	int j;
333	pippijn	1.5	#endif
334	elmex	1.1
335	root	1.9	if (op->materialname != NULL)
336			return;
337	elmex	1.1
338
339
340	root	1.9	if (nmt == NULL)
341			{
342			lmt = NULL;
343	elmex	1.1	#ifndef NEW_MATERIAL_CODE
344	root	1.9	for (mt = materialt; mt != NULL && mt->next != NULL; mt = mt->next)
345			{
346			if (op->material & mt->material)
347			{
348			lmt = mt;
349			break;
350	root	1.2	}
351			}
352	elmex	1.1
353			#else
354	root	1.9	for (mt = materialt; mt != NULL && mt->next != NULL; mt = mt->next)
355			{
356			if (op->material & mt->material && rndm (1, 100) <= mt->chance &&
357			difficulty >= mt->difficulty && (op->magic >= mt->magic \|\| mt->magic == 0))
358			{
359			lmt = mt;
360	root	1.26	if (!(op->is_weapon () \|\| op->is_armor ()))
361	root	1.9	break;
362	root	1.2	}
363			}
364	elmex	1.1	#endif
365	root	1.9	}
366			else
367			{
368			lmt = nmt;
369	elmex	1.1	}
370
371	root	1.9	if (lmt != NULL)
372			{
373	elmex	1.1	#ifndef NEW_MATERIAL_CODE
374	root	1.9	op->materialname = lmt->name;
375			return;
376	elmex	1.1	#else
377
378	root	1.26	if (op->stats.dam && op->is_weapon ())
379	root	1.9	{
380			op->stats.dam += lmt->damage;
381			if (op->stats.dam < 1)
382			op->stats.dam = 1;
383			}
384			if (op->stats.sp && op->type == BOW)
385			op->stats.sp += lmt->sp;
386	root	1.26	if (op->stats.wc && op->is_weapon ())
387	root	1.9	op->stats.wc += lmt->wc;
388	root	1.26	if (op->is_armor ())
389	root	1.9	{
390			if (op->stats.ac)
391			op->stats.ac += lmt->ac;
392			for (j = 0; j < NROFATTACKS; j++)
393			if (op->resist[j] != 0)
394			{
395			op->resist[j] += lmt->mod[j];
396			if (op->resist[j] > 100)
397			op->resist[j] = 100;
398			if (op->resist[j] < -100)
399			op->resist[j] = -100;
400			}
401			}
402			op->materialname = add_string (lmt->name);
403			/* dont make it unstackable if it doesn't need to be */
404	root	1.26	if (op->is_weapon () \|\| op->is_armor ())
405	root	1.9	{
406			op->weight = (op->weight * lmt->weight) / 100;
407			op->value = (op->value * lmt->value) / 100;
408	root	1.2	}
409	elmex	1.1	#endif
410			}
411			}
412
413			/*
414			* Strip out the media tags from a String.
415			* Warning the input string will contain the result string
416			*/
417	root	1.9	void
418			strip_media_tag (char *message)
419			{
420			int in_tag = 0;
421			char *dest;
422			char *src;
423
424			src = dest = message;
425			while (*src != '\0')
426			{
427			if (*src == '[')
428			{
429			in_tag = 1;
430			}
431			else if (in_tag && (*src == ']'))
432			in_tag = 0;
433			else if (!in_tag)
434			{
435			dest = src;
436			dest++;
437			}
438			src++;
439			}
440			*dest = '\0';
441			}
442
443			const char *
444			strrstr (const char haystack, const char needle)
445			{
446			const char *lastneedle;
447
448			lastneedle = NULL;
449			while ((haystack = strstr (haystack, needle)) != NULL)
450			{
451			lastneedle = haystack;
452			haystack++;
453	elmex	1.1	}
454	root	1.9	return lastneedle;
455
456	elmex	1.1	}
457	root	1.9
458	elmex	1.1	#define EOL_SIZE (sizeof("\n")-1)
459	root	1.9	void
460			strip_endline (char *buf)
461			{
462			if (strlen (buf) < sizeof ("\n"))
463			{
464			return;
465	elmex	1.1	}
466	root	1.9	if (!strcmp (buf + strlen (buf) - EOL_SIZE, "\n"))
467			buf[strlen (buf) - EOL_SIZE] = '\0';
468	elmex	1.1	}
469
470			/**
471			* Replace in string src all occurrences of key by replacement. The resulting
472			* string is put into result; at most resultsize characters (including the
473			* terminating null character) will be written to result.
474			*/
475	root	1.9	void
476			replace (const char src, const char key, const char replacement, char result, size_t resultsize)
477	elmex	1.1	{
478	root	1.9	size_t resultlen;
479			size_t keylen;
480	elmex	1.1
481	root	1.9	/* special case to prevent infinite loop if key==replacement=="" */
482			if (strcmp (key, replacement) == 0)
483			{
484			snprintf (result, resultsize, "%s", src);
485			return;
486			}
487
488			keylen = strlen (key);
489
490			resultlen = 0;
491			while (*src != '\0' && resultlen + 1 < resultsize)
492			{
493			if (strncmp (src, key, keylen) == 0)
494	root	1.2	{
495	root	1.9	snprintf (result + resultlen, resultsize - resultlen, "%s", replacement);
496			resultlen += strlen (result + resultlen);
497			src += keylen;
498	root	1.2	}
499	root	1.9	else
500	root	1.2	{
501	root	1.9	result[resultlen++] = *src++;
502	root	1.2	}
503	root	1.9	}
504			result[resultlen] = '\0';
505	elmex	1.1	}
506
507			/**
508			* Taking a string as an argument, mutate it into a string that looks like a list.
509			* a 'list' for the purposes here, is a string of items, seperated by commas, except
510			* for the last entry, which has an 'and' before it, and a full stop (period) after it.
511			* This function will also strip all trailing non alphanumeric characters.
512			* It does not insert an oxford comma.
513			*/
514
515	root	1.9	void
516			make_list_like (char *input)
517			{
518			char *p, tmp[MAX_BUF];
519			int i;
520
521			if (!input \|\| strlen (input) > MAX_BUF - 5)
522	elmex	1.1	return;
523	root	1.9	/* bad stuff would happen if we continued here, the -5 is to make space for ' and ' */
524
525			strncpy (tmp, input, MAX_BUF - 5);
526			/trim all trailing commas, spaces etc. /
527			for (i = strlen (tmp); !isalnum (tmp[i]) && i >= 0; i--)
528			tmp[i] = '\0';
529	root	1.11
530	root	1.9	strcat (tmp, ".");
531
532			p = strrchr (tmp, ',');
533			if (p)
534			{
535			*p = '\0';
536			strcpy (input, tmp);
537			p++;
538			strcat (input, " and");
539			strcat (input, p);
540			}
541			else
542			strcpy (input, tmp);
543	root	1.11
544	root	1.9	return;
545	elmex	1.1	}
546	root	1.3
547	root	1.14	/////////////////////////////////////////////////////////////////////////////
548
549	root	1.25	void *salloc_ (int n) throw (std::bad_alloc)
550	root	1.10	{
551	root	1.25	void *ptr = g_slice_alloc (n);
552	root	1.13
553	root	1.23	if (!ptr)
554	root	1.13	throw std::bad_alloc ();
555	root	1.4
556	root	1.23	return ptr;
557			}
558
559	root	1.25	void salloc_ (int n, void src) throw (std::bad_alloc)
560	root	1.23	{
561	root	1.25	void *ptr = salloc_ (n);
562	root	1.23
563	root	1.24	if (src)
564	root	1.25	memcpy (ptr, src, n);
565	root	1.24	else
566	root	1.25	memset (ptr, 0, n);
567	root	1.23
568			return ptr;
569	root	1.3	}
570	root	1.11
571			void assign (char dst, const char src, int maxlen)
572			{
573			if (!src)
574			src = "";
575
576			int len = strlen (src);
577
578			if (len >= maxlen - 1)
579			{
580			if (maxlen <= 4)
581			{
582			memset (dst, '.', maxlen - 1);
583			dst [maxlen - 1] = 0;
584			}
585			else
586			{
587			memcpy (dst, src, maxlen - 4);
588			memcpy (dst + maxlen - 4, "...", 4);
589			}
590			}
591			else
592			memcpy (dst, src, len + 1);
593			}
594
595	root	1.23	tstamp now ()
596			{
597			struct timeval tv;
598
599			gettimeofday (&tv, 0);
600			return tstamp (tv.tv_sec) + tstamp (tv.tv_usec) * tstamp (1e-6);
601			}
602	root	1.17
603	root	1.32	int
604			similar_direction (int a, int b)
605			{
606			if (!a \|\| !b)
607			return 0;
608
609			int diff = (b - a) & 7;
610			return diff <= 1 \|\| diff >= 7;
611			}
612