server/common/utils.C

/*
    CrossFire, A Multiplayer game for X-windows

    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 ()
{
  for (int x = 0; x < width; x++)
    for (int y = 0; y < height; y++)
      for (object *above = 0, *op = at (x, y).bot; op; op = above)
        {
          bool destroy = 0;

          above = op->above;

          // 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:	1.34
Committed:	Mon Jan 1 12:28:46 2007 UTC (17 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.33:	+21 -28 lines
Log Message:	set original flag so decay object doesn't go wild
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4			Copyright (C) 2002 Mark Wedel & Crossfire Development Team
5			Copyright (C) 1992 Frank Tore Johansen
6
7			This program is free software; you can redistribute it and/or modify
8			it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18			along with this program; if not, write to the Free Software
19			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21	root	1.15	The authors can be reached via e-mail at <crossfire@schmorp.de>
22	elmex	1.1	*/
23
24			/*
25			* General convenience functions for crossfire.
26			*/
27
28			#include <global.h>
29			#include <funcpoint.h>
30			#include <material.h>
31
32	root	1.23	#include <sys/time.h>
33			#include <time.h>
34	root	1.4	#include <glib.h>
35
36	elmex	1.1	/*
37			* The random functions here take luck into account when rolling random
38			* dice or numbers. This function has less of an impact the larger the
39			* difference becomes in the random numbers. IE, the effect is lessened
40			* on a 1-1000 roll, vs a 1-6 roll. This can be used by crafty programmers,
41			* to specifically disable luck in certain rolls, simply by making the
42			* numbers larger (ie, 1d1000 > 500 vs 1d6 > 3)
43			*/
44
45			/*
46			* Roll a random number between min and max. Uses op to determine luck,
47			* and if goodbad is non-zero, luck increases the roll, if zero, it decreases.
48			* Generally, op should be the player/caster/hitter requesting the roll,
49			* not the recipient (ie, the poor slob getting hit). [garbled 20010916]
50			*/
51
52	root	1.9	int
53			random_roll (int min, int max, const object *op, int goodbad)
54			{
55			int omin, diff, luck, base, ran;
56	elmex	1.1
57	root	1.9	omin = min;
58			diff = max - min + 1;
59			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
60	elmex	1.1
61	root	1.9	if (max < 1 \|\| diff < 1)
62			{
63			LOG (llevError, "Calling random_roll with min=%d max=%d\n", min, max);
64			return (min); /* avoids a float exception */
65	elmex	1.1	}
66
67	root	1.9	ran = RANDOM ();
68	elmex	1.1
69	root	1.9	if (op->type != PLAYER)
70			return ((ran % diff) + min);
71	elmex	1.1
72	root	1.9	luck = op->stats.luck;
73			if (RANDOM () % base < MIN (10, abs (luck)))
74			{
75			/* we have a winner */
76			((luck > 0) ? (luck = 1) : (luck = -1));
77			diff -= luck;
78			if (diff < 1)
79			return (omin); /check again /
80			((goodbad) ? (min += luck) : (diff));
81	elmex	1.1
82	root	1.9	return (MAX (omin, MIN (max, (ran % diff) + min)));
83	elmex	1.1	}
84	root	1.9	return ((ran % diff) + min);
85	elmex	1.1	}
86
87			/*
88			* This is a 64 bit version of random_roll above. This is needed
89			* for exp loss calculations for players changing religions.
90			*/
91
92	root	1.9	sint64
93			random_roll64 (sint64 min, sint64 max, const object *op, int goodbad)
94			{
95			sint64 omin, diff, luck, ran;
96			int base;
97
98			omin = min;
99			diff = max - min + 1;
100			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
101	elmex	1.1
102	root	1.9	if (max < 1 \|\| diff < 1)
103			{
104	root	1.20	LOG (llevError, "Calling random_roll with min=%" PRId64 " max=%" PRId64 "\n", min, max);
105	root	1.9	return (min); /* avoids a float exception */
106	elmex	1.1	}
107
108	root	1.9	/* Don't know of a portable call to get 64 bit random values.
109			* So make a call to get two 32 bit random numbers, and just to
110			* a little byteshifting. Do make sure the first one is only
111			* 32 bit, so we don't get skewed results
112			*/
113			ran = (RANDOM () & 0xffffffff) \| ((sint64) RANDOM () << 32);
114
115			if (op->type != PLAYER)
116			return ((ran % diff) + min);
117
118			luck = op->stats.luck;
119			if (RANDOM () % base < MIN (10, abs (luck)))
120			{
121			/* we have a winner */
122			((luck > 0) ? (luck = 1) : (luck = -1));
123			diff -= luck;
124			if (diff < 1)
125			return (omin); /check again /
126			((goodbad) ? (min += luck) : (diff));
127	elmex	1.1
128	root	1.9	return (MAX (omin, MIN (max, (ran % diff) + min)));
129	elmex	1.1	}
130	root	1.9	return ((ran % diff) + min);
131	elmex	1.1	}
132
133			/*
134			* Roll a number of dice (2d3, 4d6). Uses op to determine luck,
135			* If goodbad is non-zero, luck increases the roll, if zero, it decreases.
136			* Generally, op should be the player/caster/hitter requesting the roll,
137			* not the recipient (ie, the poor slob getting hit).
138			* The args are num D size (ie 4d6) [garbled 20010916]
139			*/
140
141	root	1.9	int
142			die_roll (int num, int size, const object *op, int goodbad)
143			{
144			int min, diff, luck, total, i, gotlucky, base, ran;
145
146			diff = size;
147			min = 1;
148			luck = total = gotlucky = 0;
149			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
150			if (size < 2 \|\| diff < 1)
151			{
152			LOG (llevError, "Calling die_roll with num=%d size=%d\n", num, size);
153			return (num); /* avoids a float exception */
154			}
155	elmex	1.1
156	root	1.9	if (op->type == PLAYER)
157			luck = op->stats.luck;
158
159			for (i = 0; i < num; i++)
160			{
161			if (RANDOM () % base < MIN (10, abs (luck)) && !gotlucky)
162			{
163			/* we have a winner */
164			gotlucky++;
165			((luck > 0) ? (luck = 1) : (luck = -1));
166			diff -= luck;
167			if (diff < 1)
168			return (num); /check again /
169			((goodbad) ? (min += luck) : (diff));
170			ran = RANDOM ();
171			total += MAX (1, MIN (size, (ran % diff) + min));
172			}
173			else
174			{
175			total += RANDOM () % size + 1;
176	root	1.2	}
177	elmex	1.1	}
178	root	1.9	return (total);
179	elmex	1.1	}
180
181			/*
182			* Another convenience function. Returns a number between min and max.
183			* It is suggested one use these functions rather than RANDOM()%, as it
184			* would appear that a number of off-by-one-errors exist due to improper
185			* use of %. This should also prevent SIGFPE.
186			*/
187
188	root	1.9	int
189			rndm (int min, int max)
190	elmex	1.1	{
191			int diff;
192
193			diff = max - min + 1;
194			if (max < 1 \|\| diff < 1)
195	root	1.9	return (min);
196	elmex	1.1
197	root	1.9	return (RANDOM () % diff + min);
198	elmex	1.1	}
199
200	root	1.33	/* decay and destroy perishable items in a map */
201	root	1.9	void
202	root	1.32	maptile::decay_objects ()
203	elmex	1.1	{
204	root	1.34	for (int x = 0; x < width; x++)
205			for (int y = 0; y < height; y++)
206			for (object above = 0, op = at (x, y).bot; op; op = above)
207			{
208			bool destroy = 0;
209	elmex	1.1
210	root	1.34	above = op->above;
211	root	1.32
212	root	1.34	// do not decay anything above unique floor tiles (yet :)
213	root	1.9	if (QUERY_FLAG (op, FLAG_IS_FLOOR) && QUERY_FLAG (op, FLAG_UNIQUE))
214			break;
215	root	1.32
216	root	1.26	if (QUERY_FLAG (op, FLAG_IS_FLOOR)
217			\|\| QUERY_FLAG (op, FLAG_OBJ_ORIGINAL)
218			\|\| QUERY_FLAG (op, FLAG_OBJ_SAVE_ON_OVL)
219			\|\| QUERY_FLAG (op, FLAG_UNIQUE)
220			\|\| QUERY_FLAG (op, FLAG_OVERLAY_FLOOR)
221			\|\| QUERY_FLAG (op, FLAG_UNPAID)
222			\|\| op->is_alive ())
223	root	1.34	; // do not decay
224			else if (op->is_weapon ())
225	root	1.9	{
226			op->stats.dam--;
227			if (op->stats.dam < 0)
228			destroy = 1;
229	root	1.2	}
230	root	1.26	else if (op->is_armor ())
231	root	1.9	{
232			op->stats.ac--;
233			if (op->stats.ac < 0)
234			destroy = 1;
235			}
236			else if (op->type == FOOD)
237			{
238			op->stats.food -= rndm (5, 20);
239			if (op->stats.food < 0)
240			destroy = 1;
241			}
242			else
243			{
244	root	1.34	int mat = op->material;
245	root	1.32
246	root	1.34	if (mat & M_PAPER
247			\|\| mat & M_LEATHER
248			\|\| mat & M_WOOD
249			\|\| mat & M_ORGANIC
250			\|\| mat & M_CLOTH
251			\|\| mat & M_LIQUID
252			\|\| (mat & M_IRON && rndm (1, 5) == 1)
253			\|\| (mat & M_GLASS && rndm (1, 2) == 1)
254			\|\| ((mat & M_STONE \|\| mat & M_ADAMANT) && rndm (1, 10) == 1)
255			\|\| ((mat & M_SOFT_METAL \|\| mat & M_BONE) && rndm (1, 3) == 1)
256			\|\| (mat & M_ICE && temp > 32))
257	root	1.9	destroy = 1;
258			}
259	root	1.32
260	root	1.9	/* adjust overall chance below */
261			if (destroy && rndm (0, 1))
262	root	1.22	op->destroy ();
263	root	1.9	}
264	elmex	1.1	}
265
266			/* convert materialname to materialtype_t */
267
268	root	1.9	materialtype_t *
269			name_to_material (const char *name)
270	elmex	1.1	{
271	root	1.9	materialtype_t mt, nmt;
272	elmex	1.1
273	root	1.9	mt = NULL;
274			for (nmt = materialt; nmt != NULL && nmt->next != NULL; nmt = nmt->next)
275			{
276			if (strcmp (name, nmt->name) == 0)
277			{
278			mt = nmt;
279			break;
280	root	1.2	}
281	elmex	1.1	}
282	root	1.9	return mt;
283	elmex	1.1	}
284
285			/* when doing transmutation of objects, we have to recheck the resistances,
286			* as some that did not apply previously, may apply now.
287			*/
288
289	root	1.9	void
290			transmute_materialname (object op, const object change)
291	elmex	1.1	{
292	root	1.9	materialtype_t *mt;
293			int j;
294	elmex	1.1
295	root	1.9	if (op->materialname == NULL)
296			return;
297	elmex	1.1
298	root	1.9	if (change->materialname != NULL && strcmp (op->materialname, change->materialname))
299			return;
300
301	root	1.26	if (!op->is_armor ())
302	root	1.9	return;
303
304			mt = name_to_material (op->materialname);
305			if (!mt)
306			{
307			LOG (llevError, "archetype '%s>%s' uses nonexistent material '%s'\n", &op->arch->name, &op->name, &op->materialname);
308			return;
309			}
310
311			for (j = 0; j < NROFATTACKS; j++)
312			if (op->resist[j] == 0 && change->resist[j] != 0)
313			{
314			op->resist[j] += mt->mod[j];
315			if (op->resist[j] > 100)
316			op->resist[j] = 100;
317			if (op->resist[j] < -100)
318			op->resist[j] = -100;
319			}
320	elmex	1.1	}
321
322			/* set the materialname and type for an item */
323	root	1.9	void
324			set_materialname (object op, int difficulty, materialtype_t nmt)
325	elmex	1.1	{
326	root	1.9	materialtype_t mt, lmt;
327
328	pippijn	1.5	#ifdef NEW_MATERIAL_CODE
329	root	1.9	int j;
330	pippijn	1.5	#endif
331	elmex	1.1
332	root	1.9	if (op->materialname != NULL)
333			return;
334	elmex	1.1
335
336
337	root	1.9	if (nmt == NULL)
338			{
339			lmt = NULL;
340	elmex	1.1	#ifndef NEW_MATERIAL_CODE
341	root	1.9	for (mt = materialt; mt != NULL && mt->next != NULL; mt = mt->next)
342			{
343			if (op->material & mt->material)
344			{
345			lmt = mt;
346			break;
347	root	1.2	}
348			}
349	elmex	1.1
350			#else
351	root	1.9	for (mt = materialt; mt != NULL && mt->next != NULL; mt = mt->next)
352			{
353			if (op->material & mt->material && rndm (1, 100) <= mt->chance &&
354			difficulty >= mt->difficulty && (op->magic >= mt->magic \|\| mt->magic == 0))
355			{
356			lmt = mt;
357	root	1.26	if (!(op->is_weapon () \|\| op->is_armor ()))
358	root	1.9	break;
359	root	1.2	}
360			}
361	elmex	1.1	#endif
362	root	1.9	}
363			else
364			{
365			lmt = nmt;
366	elmex	1.1	}
367
368	root	1.9	if (lmt != NULL)
369			{
370	elmex	1.1	#ifndef NEW_MATERIAL_CODE
371	root	1.9	op->materialname = lmt->name;
372			return;
373	elmex	1.1	#else
374
375	root	1.26	if (op->stats.dam && op->is_weapon ())
376	root	1.9	{
377			op->stats.dam += lmt->damage;
378			if (op->stats.dam < 1)
379			op->stats.dam = 1;
380			}
381			if (op->stats.sp && op->type == BOW)
382			op->stats.sp += lmt->sp;
383	root	1.26	if (op->stats.wc && op->is_weapon ())
384	root	1.9	op->stats.wc += lmt->wc;
385	root	1.26	if (op->is_armor ())
386	root	1.9	{
387			if (op->stats.ac)
388			op->stats.ac += lmt->ac;
389			for (j = 0; j < NROFATTACKS; j++)
390			if (op->resist[j] != 0)
391			{
392			op->resist[j] += lmt->mod[j];
393			if (op->resist[j] > 100)
394			op->resist[j] = 100;
395			if (op->resist[j] < -100)
396			op->resist[j] = -100;
397			}
398			}
399			op->materialname = add_string (lmt->name);
400			/* dont make it unstackable if it doesn't need to be */
401	root	1.26	if (op->is_weapon () \|\| op->is_armor ())
402	root	1.9	{
403			op->weight = (op->weight * lmt->weight) / 100;
404			op->value = (op->value * lmt->value) / 100;
405	root	1.2	}
406	elmex	1.1	#endif
407			}
408			}
409
410			/*
411			* Strip out the media tags from a String.
412			* Warning the input string will contain the result string
413			*/
414	root	1.9	void
415			strip_media_tag (char *message)
416			{
417			int in_tag = 0;
418			char *dest;
419			char *src;
420
421			src = dest = message;
422			while (*src != '\0')
423			{
424			if (*src == '[')
425			{
426			in_tag = 1;
427			}
428			else if (in_tag && (*src == ']'))
429			in_tag = 0;
430			else if (!in_tag)
431			{
432			dest = src;
433			dest++;
434			}
435			src++;
436			}
437			*dest = '\0';
438			}
439
440			const char *
441			strrstr (const char haystack, const char needle)
442			{
443			const char *lastneedle;
444
445			lastneedle = NULL;
446			while ((haystack = strstr (haystack, needle)) != NULL)
447			{
448			lastneedle = haystack;
449			haystack++;
450	elmex	1.1	}
451	root	1.9	return lastneedle;
452
453	elmex	1.1	}
454	root	1.9
455	elmex	1.1	#define EOL_SIZE (sizeof("\n")-1)
456	root	1.9	void
457			strip_endline (char *buf)
458			{
459			if (strlen (buf) < sizeof ("\n"))
460			{
461			return;
462	elmex	1.1	}
463	root	1.9	if (!strcmp (buf + strlen (buf) - EOL_SIZE, "\n"))
464			buf[strlen (buf) - EOL_SIZE] = '\0';
465	elmex	1.1	}
466
467			/**
468			* Replace in string src all occurrences of key by replacement. The resulting
469			* string is put into result; at most resultsize characters (including the
470			* terminating null character) will be written to result.
471			*/
472	root	1.9	void
473			replace (const char src, const char key, const char replacement, char result, size_t resultsize)
474	elmex	1.1	{
475	root	1.9	size_t resultlen;
476			size_t keylen;
477	elmex	1.1
478	root	1.9	/* special case to prevent infinite loop if key==replacement=="" */
479			if (strcmp (key, replacement) == 0)
480			{
481			snprintf (result, resultsize, "%s", src);
482			return;
483			}
484
485			keylen = strlen (key);
486
487			resultlen = 0;
488			while (*src != '\0' && resultlen + 1 < resultsize)
489			{
490			if (strncmp (src, key, keylen) == 0)
491	root	1.2	{
492	root	1.9	snprintf (result + resultlen, resultsize - resultlen, "%s", replacement);
493			resultlen += strlen (result + resultlen);
494			src += keylen;
495	root	1.2	}
496	root	1.9	else
497	root	1.2	{
498	root	1.9	result[resultlen++] = *src++;
499	root	1.2	}
500	root	1.9	}
501			result[resultlen] = '\0';
502	elmex	1.1	}
503
504			/**
505			* Taking a string as an argument, mutate it into a string that looks like a list.
506			* a 'list' for the purposes here, is a string of items, seperated by commas, except
507			* for the last entry, which has an 'and' before it, and a full stop (period) after it.
508			* This function will also strip all trailing non alphanumeric characters.
509			* It does not insert an oxford comma.
510			*/
511
512	root	1.9	void
513			make_list_like (char *input)
514			{
515			char *p, tmp[MAX_BUF];
516			int i;
517
518			if (!input \|\| strlen (input) > MAX_BUF - 5)
519	elmex	1.1	return;
520	root	1.9	/* bad stuff would happen if we continued here, the -5 is to make space for ' and ' */
521
522			strncpy (tmp, input, MAX_BUF - 5);
523			/trim all trailing commas, spaces etc. /
524			for (i = strlen (tmp); !isalnum (tmp[i]) && i >= 0; i--)
525			tmp[i] = '\0';
526	root	1.11
527	root	1.9	strcat (tmp, ".");
528
529			p = strrchr (tmp, ',');
530			if (p)
531			{
532			*p = '\0';
533			strcpy (input, tmp);
534			p++;
535			strcat (input, " and");
536			strcat (input, p);
537			}
538			else
539			strcpy (input, tmp);
540	root	1.11
541	root	1.9	return;
542	elmex	1.1	}
543	root	1.3
544	root	1.14	/////////////////////////////////////////////////////////////////////////////
545
546	root	1.25	void *salloc_ (int n) throw (std::bad_alloc)
547	root	1.10	{
548	root	1.25	void *ptr = g_slice_alloc (n);
549	root	1.13
550	root	1.23	if (!ptr)
551	root	1.13	throw std::bad_alloc ();
552	root	1.4
553	root	1.23	return ptr;
554			}
555
556	root	1.25	void salloc_ (int n, void src) throw (std::bad_alloc)
557	root	1.23	{
558	root	1.25	void *ptr = salloc_ (n);
559	root	1.23
560	root	1.24	if (src)
561	root	1.25	memcpy (ptr, src, n);
562	root	1.24	else
563	root	1.25	memset (ptr, 0, n);
564	root	1.23
565			return ptr;
566	root	1.3	}
567	root	1.11
568			void assign (char dst, const char src, int maxlen)
569			{
570			if (!src)
571			src = "";
572
573			int len = strlen (src);
574
575			if (len >= maxlen - 1)
576			{
577			if (maxlen <= 4)
578			{
579			memset (dst, '.', maxlen - 1);
580			dst [maxlen - 1] = 0;
581			}
582			else
583			{
584			memcpy (dst, src, maxlen - 4);
585			memcpy (dst + maxlen - 4, "...", 4);
586			}
587			}
588			else
589			memcpy (dst, src, len + 1);
590			}
591
592	root	1.23	tstamp now ()
593			{
594			struct timeval tv;
595
596			gettimeofday (&tv, 0);
597			return tstamp (tv.tv_sec) + tstamp (tv.tv_usec) * tstamp (1e-6);
598			}
599	root	1.17
600	root	1.32	int
601			similar_direction (int a, int b)
602			{
603			if (!a \|\| !b)
604			return 0;
605
606			int diff = (b - a) & 7;
607			return diff <= 1 \|\| diff >= 7;
608			}
609