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 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 r_min;          /*check again */

          if (prefer_high)
            r_min += luck;

          return clamp (ran % range + r_min, r_min, 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 | logBacktrace, "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:	1.12
Committed:	Thu Apr 29 17:43:26 2010 UTC (14 years, 2 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.11:	+3 -4 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*
4	* Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	* Copyright (©) 2002 Mark Wedel & Crossfire Development Team
6	* Copyright (©) 1992 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	* 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	random_roll (int r_min, int r_max, const object *op, bool prefer_high)
78	{
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	random_roll64 (sint64 r_min, sint64 r_max, const object *op, bool prefer_high)
102	{
103	sint64 range = max (0, r_max - r_min + 1);
104	int base = range > 2 ? 20 : 50; /* d2 and d3 are corner cases */
105
106	/*
107	* Make a call to get two 32 bit unsigned random numbers, and just do
108	* a little bitshifting.
109	*/
110	sint64 ran = (sint64) rndm.next () ^ ((sint64) rndm.next () << 31);
111
112	if (op->stats.luck)
113	{
114	int luck = op->stats.luck;
115
116	if (rndm (base) < min (10, abs (luck)))
117	{
118	/* we have a winner */
119	luck = luck > 0 ? 1 : -1;
120
121	range -= luck;
122	if (range < 1)
123	return r_min; /check again /
124
125	if (prefer_high)
126	r_min += luck;
127
128	return clamp (ran % range + r_min, r_min, r_max);
129	}
130	}
131
132	return ran % range + r_min;
133	}
134
135	/*
136	* Roll a number of dice (2d3, 4d6). Uses op to determine luck,
137	* If goodbad is non-zero, luck increases the roll, if zero, it decreases.
138	* Generally, op should be the player/caster/hitter requesting the roll,
139	* not the recipient (ie, the poor slob getting hit).
140	* The args are num D size (ie 4d6) [garbled 20010916]
141	*/
142	int
143	die_roll (int num, int size, const object *op, bool prefer_high)
144	{
145	int min_roll, luck, total, i, gotlucky;
146
147	int diff = size;
148	min_roll = 1;
149	luck = total = gotlucky = 0;
150	int base = diff > 2 ? 20 : 50; /* d2 and d3 are corner cases */
151
152	if (size < 2 \|\| diff < 1)
153	{
154	LOG (llevError \| logBacktrace, "Calling die_roll with num=%d size=%d\n", num, size);
155	return num; /* avoids a float exception */
156	}
157
158	if (op->type == PLAYER)
159	luck = op->stats.luck;
160
161	for (i = 0; i < num; i++)
162	{
163	if (rndm (base) < min (10, abs (luck)) && !gotlucky)
164	{
165	/* we have a winner */
166	gotlucky++;
167	((luck > 0) ? (luck = 1) : (luck = -1));
168	diff -= luck;
169	if (diff < 1)
170	return (num); /check again /
171	((prefer_high) ? (min_roll += luck) : (diff));
172	total += max (1, min (size, rndm (diff) + min_roll));
173	}
174	else
175	total += rndm (size) + 1;
176	}
177
178	return total;
179	}
180
181	/////////////////////////////////////////////////////////////////////////////
182
183	#ifndef PATH_MAX
184	# define PATH_MAX 8192
185	#endif
186
187	char *
188	path_combine (const char src, const char dst)
189	{
190	char *p;
191	static char path[PATH_MAX];
192
193	if (*dst == '/')
194	{
195	/* absolute destination path => ignore source path */
196	strcpy (path, dst);
197	}
198	else
199	{
200	/* relative destination path => add after last '/' of source */
201	strcpy (path, src);
202	p = strrchr (path, '/');
203	if (p)
204	p++;
205	else
206	{
207	p = path;
208	if (*src == '/')
209	*p++ = '/';
210	}
211
212	strcpy (p, dst);
213	}
214
215	return path;
216	}
217
218	static void
219	path_normalize (char *path)
220	{
221	char p; / points to the beginning of the path not yet processed; this is
222	either a path component or a path separator character */
223	char q; / points to the end of the path component p points to */
224	char w; / points to the end of the already normalized path; w <= p is
225	maintained */
226	size_t len; /* length of current component (which p points to) */
227
228	p = path;
229	w = p;
230	while (*p != '\0')
231	{
232	if (*p == '/')
233	{
234	if ((w == path && *path == '/') \|\| (w > path && w[-1] != '/'))
235	*w++ = '/';
236
237	p++;
238	continue;
239	}
240
241	q = strchr (p, '/');
242	if (q == NULL)
243	q = p + strlen (p);
244	len = q - p;
245	assert (len > 0);
246
247	if (len == 1 && *p == '.')
248	{
249	/* remove current component */
250	}
251	else if (len == 2 && memcmp (p, "..", 2) == 0)
252	{
253	if (w == path \|\| (w == path + 3 && memcmp (path, "../", 3) == 0))
254	{
255	/* keep ".." at beginning of relative path ("../x" => "../x") */
256	memmove (w, p, len);
257	w += len;
258	}
259	else if (w == path + 1 && *path == '/')
260	{
261	/* remove ".." at beginning of absolute path ("/../x" => "/x") */
262	}
263	else
264	{
265	/* remove both current component ".." and preceding one */
266	if (w > path && w[-1] == '/')
267	w--;
268	while (w > path && w[-1] != '/')
269	w--;
270	}
271	}
272	else
273	{
274	/* normal component ==> add it */
275	memmove (w, p, len);
276	w += len;
277	}
278
279	p = q;
280	}
281
282	/* remove trailing slashes, but keep the one at the start of the path */
283	while (w > path + 1 && w[-1] == '/')
284	w--;
285
286	*w = '\0';
287	}
288
289	char *
290	path_combine_and_normalize (const char src, const char dst)
291	{
292	char *path;
293
294	path = path_combine (src, dst);
295	path_normalize (path);
296	return (path);
297	}
298
299	#define EOL_SIZE (sizeof("\n")-1)
300	void
301	strip_endline (char *buf)
302	{
303	if (*buf && buf [strlen (buf) - 1] == '\n')
304	buf [strlen (buf) - 1] = '\0';
305	}
306
307	/**
308	* Replace in string src all occurrences of key by replacement. The resulting
309	* string is put into result; at most resultsize characters (including the
310	* terminating null character) will be written to result.
311	*/
312	void
313	replace (const char src, const char key, const char replacement, char result, size_t resultsize)
314	{
315	size_t resultlen;
316	size_t keylen;
317
318	/* special case to prevent infinite loop if key==replacement=="" */
319	if (strcmp (key, replacement) == 0)
320	{
321	snprintf (result, resultsize, "%s", src);
322	return;
323	}
324
325	keylen = strlen (key);
326
327	resultlen = 0;
328	while (*src != '\0' && resultlen + 1 < resultsize)
329	{
330	if (strncmp (src, key, keylen) == 0)
331	{
332	snprintf (result + resultlen, resultsize - resultlen, "%s", replacement);
333	resultlen += strlen (result + resultlen);
334	src += keylen;
335	}
336	else
337	{
338	result[resultlen++] = *src++;
339	}
340	}
341	result[resultlen] = '\0';
342	}
343