server/common/compat.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 2002 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992 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>
 */

/*
 * compatibility functions for older (GPL) source code parts
 */

#include <cstring>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>

#include <global.h>
#include "define.h"
#include "path.h"

/* buf_overflow() - we don't want to exceed the buffer size of 
 * buf1 by adding on buf2! Returns true if overflow will occur.
 */
int
buf_overflow (const char *buf1, const char *buf2, int bufsize)
{
  int len1 = 0, len2 = 0;

  if (buf1)
    len1 = strlen (buf1);

  if (buf2)
    len2 = strlen (buf2);

  if ((len1 + len2) >= bufsize)
    return 1;

  return 0;
}

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

/*
 * 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, bool prefer_high)
{
  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, bool prefer_high)
{
  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 do
   * a little bitshifting.
   */
  sint64 ran = (sint64) rndm.next () ^ ((sint64) rndm.next () << 31);

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

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

          if (prefer_high)
            r_min += luck;

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

  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, bool prefer_high)
{
  int min_roll, luck, total, i, gotlucky;

  int diff = size;
  min_roll = 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 */
          ((prefer_high) ? (min_roll += luck) : (diff));
          total += max (1, min (size, rndm (diff) + min_roll));
        }
      else
        total += rndm (size) + 1;
    }

  return total;
}

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

#ifndef PATH_MAX
# define PATH_MAX 8192
#endif

char *
path_combine (const char *src, const char *dst)
{
  char *p;
  static char path[PATH_MAX];

  if (*dst == '/')
    {
      /* absolute destination path => ignore source path */
      strcpy (path, dst);
    }
  else
    {
      /* relative destination path => add after last '/' of source */
      strcpy (path, src);
      p = strrchr (path, '/');
      if (p)
        p++;
      else
        {
          p = path;
          if (*src == '/')
            *p++ = '/';
        }

      strcpy (p, dst);
    }

  return path;
}

static void
path_normalize (char *path)
{
  char *p;                      /* points to the beginning of the path not yet processed; this is
                                   either a path component or a path separator character */
  char *q;                      /* points to the end of the path component p points to */
  char *w;                      /* points to the end of the already normalized path; w <= p is
                                   maintained */
  size_t len;                   /* length of current component (which p points to) */

  p = path;
  w = p;
  while (*p != '\0')
    {
      if (*p == '/')
        {
          if ((w == path && *path == '/') || (w > path && w[-1] != '/'))
            *w++ = '/';

          p++;
          continue;
        }

      q = strchr (p, '/');
      if (q == NULL)
        q = p + strlen (p);
      len = q - p;
      assert (len > 0);

      if (len == 1 && *p == '.')
        {
          /* remove current component */
        }
      else if (len == 2 && memcmp (p, "..", 2) == 0)
        {
          if (w == path || (w == path + 3 && memcmp (path, "../", 3) == 0))
            {
              /* keep ".." at beginning of relative path ("../x" => "../x") */
              memmove (w, p, len);
              w += len;
            }
          else if (w == path + 1 && *path == '/')
            {
              /* remove ".." at beginning of absolute path ("/../x" => "/x") */
            }
          else
            {
              /* remove both current component ".." and preceding one */
              if (w > path && w[-1] == '/')
                w--;
              while (w > path && w[-1] != '/')
                w--;
            }
        }
      else
        {
          /* normal component ==> add it */
          memmove (w, p, len);
          w += len;
        }

      p = q;
    }

  /* remove trailing slashes, but keep the one at the start of the path */
  while (w > path + 1 && w[-1] == '/')
    w--;

  *w = '\0';
}

char *
path_combine_and_normalize (const char *src, const char *dst)
{
  char *path;

  path = path_combine (src, dst);
  path_normalize (path);
  return (path);
}

#define EOL_SIZE (sizeof("\n")-1)
void
strip_endline (char *buf)
{
  if (*buf && buf [strlen (buf) - 1] == '\n')
    buf [strlen (buf) - 1] = '\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';
}

Revision:	1.11
Committed:	Thu Apr 29 15:59:09 2010 UTC (14 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.10:	+6 -21 lines
Log Message:	cleanup
#	User	Rev	Content
1	root	1.1	/*
2			* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3			*
4	root	1.6	* Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	root	1.5	* Copyright (©) 2002 Mark Wedel & Crossfire Development Team
6			* Copyright (©) 1992 Frank Tore Johansen
7	root	1.1	*
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			* compatibility functions for older (GPL) source code parts
27			*/
28
29			#include <cstring>
30			#include <assert.h>
31			#include <stdio.h>
32			#include <string.h>
33			#include <limits.h>
34
35			#include <global.h>
36			#include "define.h"
37			#include "path.h"
38
39			/* buf_overflow() - we don't want to exceed the buffer size of
40			* buf1 by adding on buf2! Returns true if overflow will occur.
41			*/
42			int
43			buf_overflow (const char buf1, const char buf2, int bufsize)
44			{
45			int len1 = 0, len2 = 0;
46
47			if (buf1)
48			len1 = strlen (buf1);
49
50			if (buf2)
51			len2 = strlen (buf2);
52
53			if ((len1 + len2) >= bufsize)
54			return 1;
55
56			return 0;
57			}
58
59			/////////////////////////////////////////////////////////////////////////////
60
61			/*
62			* The random functions here take luck into account when rolling random
63			* dice or numbers. This function has less of an impact the larger the
64			* difference becomes in the random numbers. IE, the effect is lessened
65			* on a 1-1000 roll, vs a 1-6 roll. This can be used by crafty programmers,
66			* to specifically disable luck in certain rolls, simply by making the
67			* numbers larger (ie, 1d1000 > 500 vs 1d6 > 3)
68			*/
69
70			/*
71			* Roll a random number between min and max. Uses op to determine luck,
72			* and if goodbad is non-zero, luck increases the roll, if zero, it decreases.
73			* Generally, op should be the player/caster/hitter requesting the roll,
74			* not the recipient (ie, the poor slob getting hit). [garbled 20010916]
75			*/
76			int
77	root	1.11	random_roll (int r_min, int r_max, const object *op, bool prefer_high)
78	root	1.1	{
79			r_max = max (r_min, r_max);
80
81			int base = r_max - r_min > 1 ? 20 : 50; /* d2 and d3 are corner cases */
82
83			if (op->type == PLAYER)
84			{
85			int luck = op->stats.luck;
86
87			if (rndm (base) < min (10, abs (luck)))
88			{
89			//TODO: take luck into account
90			}
91			}
92
93			return rndm (r_min, r_max);
94			}
95
96			/*
97			* This is a 64 bit version of random_roll above. This is needed
98			* for exp loss calculations for players changing religions.
99			*/
100			sint64
101	root	1.11	random_roll64 (sint64 r_min, sint64 r_max, const object *op, bool prefer_high)
102	root	1.1	{
103			sint64 omin = r_min;
104			sint64 range = max (0, r_max - r_min + 1);
105			int base = range > 2 ? 20 : 50; /* d2 and d3 are corner cases */
106
107			/*
108	root	1.10	* Make a call to get two 32 bit unsigned random numbers, and just do
109	root	1.1	* a little bitshifting.
110			*/
111			sint64 ran = (sint64) rndm.next () ^ ((sint64) rndm.next () << 31);
112
113	root	1.10	if (op->stats.luck)
114			{
115			int luck = op->stats.luck;
116	root	1.1
117	root	1.10	if (rndm (base) < min (10, abs (luck)))
118			{
119			/* we have a winner */
120			luck = luck > 0 ? 1 : -1;
121
122			range -= luck;
123			if (range < 1)
124			return omin; /check again /
125	root	1.1
126	root	1.11	if (prefer_high)
127	root	1.10	r_min += luck;
128	root	1.1
129	root	1.11	return clamp (ran % range + r_min, omin, r_max);
130	root	1.10	}
131	root	1.1	}
132
133			return ran % range + r_min;
134			}
135
136			/*
137			* Roll a number of dice (2d3, 4d6). Uses op to determine luck,
138			* If goodbad is non-zero, luck increases the roll, if zero, it decreases.
139			* Generally, op should be the player/caster/hitter requesting the roll,
140			* not the recipient (ie, the poor slob getting hit).
141			* The args are num D size (ie 4d6) [garbled 20010916]
142			*/
143			int
144	root	1.11	die_roll (int num, int size, const object *op, bool prefer_high)
145	root	1.1	{
146	root	1.4	int min_roll, luck, total, i, gotlucky;
147	root	1.1
148			int diff = size;
149	root	1.4	min_roll = 1;
150	root	1.1	luck = total = gotlucky = 0;
151			int base = diff > 2 ? 20 : 50; /* d2 and d3 are corner cases */
152
153			if (size < 2 \|\| diff < 1)
154			{
155			LOG (llevError, "Calling die_roll with num=%d size=%d\n", num, size);
156			return num; /* avoids a float exception */
157			}
158
159			if (op->type == PLAYER)
160			luck = op->stats.luck;
161
162			for (i = 0; i < num; i++)
163			{
164	root	1.4	if (rndm (base) < min (10, abs (luck)) && !gotlucky)
165	root	1.1	{
166			/* we have a winner */
167			gotlucky++;
168			((luck > 0) ? (luck = 1) : (luck = -1));
169			diff -= luck;
170			if (diff < 1)
171			return (num); /check again /
172	root	1.11	((prefer_high) ? (min_roll += luck) : (diff));
173	root	1.4	total += max (1, min (size, rndm (diff) + min_roll));
174	root	1.1	}
175			else
176			total += rndm (size) + 1;
177			}
178
179			return total;
180			}
181
182			/////////////////////////////////////////////////////////////////////////////
183
184			#ifndef PATH_MAX
185			# define PATH_MAX 8192
186			#endif
187
188			char *
189			path_combine (const char src, const char dst)
190			{
191			char *p;
192			static char path[PATH_MAX];
193
194			if (*dst == '/')
195			{
196			/* absolute destination path => ignore source path */
197			strcpy (path, dst);
198			}
199			else
200			{
201			/* relative destination path => add after last '/' of source */
202			strcpy (path, src);
203			p = strrchr (path, '/');
204			if (p)
205			p++;
206			else
207			{
208			p = path;
209			if (*src == '/')
210			*p++ = '/';
211			}
212
213			strcpy (p, dst);
214			}
215
216			return path;
217			}
218
219	root	1.2	static void
220	root	1.1	path_normalize (char *path)
221			{
222			char p; / points to the beginning of the path not yet processed; this is
223			either a path component or a path separator character */
224			char q; / points to the end of the path component p points to */
225			char w; / points to the end of the already normalized path; w <= p is
226			maintained */
227			size_t len; /* length of current component (which p points to) */
228
229			p = path;
230			w = p;
231			while (*p != '\0')
232			{
233			if (*p == '/')
234			{
235			if ((w == path && *path == '/') \|\| (w > path && w[-1] != '/'))
236			*w++ = '/';
237
238			p++;
239			continue;
240			}
241
242			q = strchr (p, '/');
243			if (q == NULL)
244			q = p + strlen (p);
245			len = q - p;
246			assert (len > 0);
247
248			if (len == 1 && *p == '.')
249			{
250			/* remove current component */
251			}
252			else if (len == 2 && memcmp (p, "..", 2) == 0)
253			{
254			if (w == path \|\| (w == path + 3 && memcmp (path, "../", 3) == 0))
255			{
256			/* keep ".." at beginning of relative path ("../x" => "../x") */
257			memmove (w, p, len);
258			w += len;
259			}
260			else if (w == path + 1 && *path == '/')
261			{
262			/* remove ".." at beginning of absolute path ("/../x" => "/x") */
263			}
264			else
265			{
266			/* remove both current component ".." and preceding one */
267			if (w > path && w[-1] == '/')
268			w--;
269			while (w > path && w[-1] != '/')
270			w--;
271			}
272			}
273			else
274			{
275			/* normal component ==> add it */
276			memmove (w, p, len);
277			w += len;
278			}
279
280			p = q;
281			}
282
283			/* remove trailing slashes, but keep the one at the start of the path */
284			while (w > path + 1 && w[-1] == '/')
285			w--;
286
287			*w = '\0';
288			}
289
290			char *
291			path_combine_and_normalize (const char src, const char dst)
292			{
293			char *path;
294
295			path = path_combine (src, dst);
296			path_normalize (path);
297			return (path);
298			}
299
300			#define EOL_SIZE (sizeof("\n")-1)
301			void
302			strip_endline (char *buf)
303			{
304	root	1.9	if (*buf && buf [strlen (buf) - 1] == '\n')
305			buf [strlen (buf) - 1] = '\0';
306	root	1.1	}
307
308			/**
309			* Replace in string src all occurrences of key by replacement. The resulting
310			* string is put into result; at most resultsize characters (including the
311			* terminating null character) will be written to result.
312			*/
313			void
314			replace (const char src, const char key, const char replacement, char result, size_t resultsize)
315			{
316			size_t resultlen;
317			size_t keylen;
318
319			/* special case to prevent infinite loop if key==replacement=="" */
320			if (strcmp (key, replacement) == 0)
321			{
322			snprintf (result, resultsize, "%s", src);
323			return;
324			}
325
326			keylen = strlen (key);
327
328			resultlen = 0;
329			while (*src != '\0' && resultlen + 1 < resultsize)
330			{
331			if (strncmp (src, key, keylen) == 0)
332			{
333			snprintf (result + resultlen, resultsize - resultlen, "%s", replacement);
334			resultlen += strlen (result + resultlen);
335			src += keylen;
336			}
337			else
338			{
339			result[resultlen++] = *src++;
340			}
341			}
342			result[resultlen] = '\0';
343			}
344