server/common/utils.c

/*
 * static char *rcsid_utils_c =
 *   "$Id: utils.c,v 1.22 2006/01/08 22:47:56 qal21 Exp $";
 */

/*
    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-devel@real-time.com
*/

/*
 * General convenience functions for crossfire.
 */

#include <global.h>
#include <funcpoint.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, 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, 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) {
#ifndef WIN32
      LOG(llevError, "Calling random_roll with min=%lld max=%lld\n", min, max);
#else
      LOG(llevError, "Calling random_roll with min=%I64d max=%I64d\n", min, max);
#endif
      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, 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 persihable items in a map */

void decay_objects(mapstruct *m)
{
    int x, y, destroy;
    object *op, *otmp;

    if (m->unique)
        return;

    for (x=0; x < MAP_WIDTH(m); x++)
        for (y=0; y < MAP_HEIGHT(m); y++)
           for (op = get_map_ob(m, x, y); op; op = otmp) {
                destroy = 0;
                otmp = op->above;
                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) || IS_LIVE(op))
                    continue;
                /* otherwise, we decay and destroy */
                if (IS_WEAPON(op)) {
                    op->stats.dam--;
                    if (op->stats.dam < 0)
                        destroy = 1;
                } else if (IS_ARMOR(op)) {
                    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 {
                    if (op->material & M_PAPER || op->material & M_LEATHER ||
                        op->material & M_WOOD || op->material & M_ORGANIC ||
                        op->material & M_CLOTH || op->material & M_LIQUID)
                        destroy = 1;
                    if (op->material & M_IRON && rndm(1,5) == 1)
                        destroy = 1;
                    if (op->material & M_GLASS && rndm(1,2) == 1)
                        destroy = 1;
                    if ((op->material & M_STONE || op->material & M_ADAMANT) &&
                        rndm(1,10) == 1)
                        destroy = 1;
                    if ((op->material & M_SOFT_METAL || op->material & M_BONE) &&
                        rndm(1,3) == 1)
                        destroy = 1;
                    if (op->material & M_ICE && MAP_TEMP(m) > 32)
                        destroy = 1;
                }
                /* adjust overall chance below */
                if (destroy && rndm(0, 1)) {
                    remove_ob(op);
                    free_object(op);
                }
            }
}

/* 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, object *change)
{
    materialtype_t *mt;
    int j;

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

    if (change->materialname != NULL &&
        strcmp(op->materialname, change->materialname))
        return;

    if (!IS_ARMOR(op))
        return;

    mt = name_to_material(op->materialname);

    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;
    int j;

    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 (!(IS_WEAPON(op) || IS_ARMOR(op)))
                    break;
            }
        }
#endif
    } else {
        lmt = nmt;
    }

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

        if (op->stats.dam && IS_WEAPON(op)) {
            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 && IS_WEAPON(op))
            op->stats.wc += lmt->wc;
        if (IS_ARMOR(op)) {
            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 (IS_WEAPON(op) || IS_ARMOR(op)) {
            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;
}
Revision:	1.1.1.1 (vendor branch)
Committed:	Fri Feb 3 07:11:41 2006 UTC (18 years, 3 months ago) by root
Content type:	text/plain
Branch:	UPSTREAM
CVS Tags:	UPSTREAM_2006_02_03
Changes since 1.1:	+0 -0 lines
Log Message:	initial import
#	User	Rev	Content
1	root	1.1	/*
2			* static char *rcsid_utils_c =
3			* "$Id: utils.c,v 1.22 2006/01/08 22:47:56 qal21 Exp $";
4			*/
5
6			/*
7			CrossFire, A Multiplayer game for X-windows
8
9			Copyright (C) 2002 Mark Wedel & Crossfire Development Team
10			Copyright (C) 1992 Frank Tore Johansen
11
12			This program is free software; you can redistribute it and/or modify
13			it under the terms of the GNU General Public License as published by
14			the Free Software Foundation; either version 2 of the License, or
15			(at your option) any later version.
16
17			This program is distributed in the hope that it will be useful,
18			but WITHOUT ANY WARRANTY; without even the implied warranty of
19			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20			GNU General Public License for more details.
21
22			You should have received a copy of the GNU General Public License
23			along with this program; if not, write to the Free Software
24			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26			The authors can be reached via e-mail at crossfire-devel@real-time.com
27			*/
28
29			/*
30			* General convenience functions for crossfire.
31			*/
32
33			#include <global.h>
34			#include <funcpoint.h>
35
36			/*
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			int random_roll(int min, int max, object *op, int goodbad) {
53			int omin, diff, luck, base, ran;
54
55			omin = min;
56			diff = max - min + 1;
57			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
58
59			if (max < 1 \|\| diff < 1) {
60			LOG(llevError, "Calling random_roll with min=%d max=%d\n", min, max);
61			return(min); /* avoids a float exception */
62			}
63
64			ran = RANDOM();
65
66			if (op->type != PLAYER)
67			return((ran%diff)+min);
68
69			luck = op->stats.luck;
70			if (RANDOM()%base < MIN(10, abs(luck))) {
71			/* we have a winner */
72			((luck > 0) ? (luck = 1) : (luck = -1));
73			diff -= luck;
74			if (diff < 1)
75			return(omin); /check again/
76			((goodbad) ? (min += luck) : (diff));
77
78			return(MAX(omin, MIN(max, (ran%diff)+min)));
79			}
80			return((ran%diff)+min);
81			}
82
83			/*
84			* This is a 64 bit version of random_roll above. This is needed
85			* for exp loss calculations for players changing religions.
86			*/
87
88			sint64 random_roll64(sint64 min, sint64 max, object *op, int goodbad) {
89			sint64 omin, diff, luck, ran;
90			int base;
91
92			omin = min;
93			diff = max - min + 1;
94			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
95
96			if (max < 1 \|\| diff < 1) {
97			#ifndef WIN32
98			LOG(llevError, "Calling random_roll with min=%lld max=%lld\n", min, max);
99			#else
100			LOG(llevError, "Calling random_roll with min=%I64d max=%I64d\n", min, max);
101			#endif
102			return(min); /* avoids a float exception */
103			}
104
105			/* Don't know of a portable call to get 64 bit random values.
106			* So make a call to get two 32 bit random numbers, and just to
107			* a little byteshifting. Do make sure the first one is only
108			* 32 bit, so we don't get skewed results
109			*/
110			ran = (RANDOM() & 0xffffffff) \| ((sint64)RANDOM() << 32);
111
112			if (op->type != PLAYER)
113			return((ran%diff)+min);
114
115			luck = op->stats.luck;
116			if (RANDOM()%base < MIN(10, abs(luck))) {
117			/* we have a winner */
118			((luck > 0) ? (luck = 1) : (luck = -1));
119			diff -= luck;
120			if (diff < 1)
121			return(omin); /check again/
122			((goodbad) ? (min += luck) : (diff));
123
124			return(MAX(omin, MIN(max, (ran%diff)+min)));
125			}
126			return((ran%diff)+min);
127			}
128
129			/*
130			* Roll a number of dice (2d3, 4d6). Uses op to determine luck,
131			* If goodbad is non-zero, luck increases the roll, if zero, it decreases.
132			* Generally, op should be the player/caster/hitter requesting the roll,
133			* not the recipient (ie, the poor slob getting hit).
134			* The args are num D size (ie 4d6) [garbled 20010916]
135			*/
136
137			int die_roll(int num, int size, object *op, int goodbad) {
138			int min, diff, luck, total, i, gotlucky, base, ran;
139
140			diff = size;
141			min = 1;
142			luck = total = gotlucky = 0;
143			((diff > 2) ? (base = 20) : (base = 50)); /* d2 and d3 are corner cases */
144			if (size < 2 \|\| diff < 1) {
145			LOG(llevError, "Calling die_roll with num=%d size=%d\n", num, size);
146			return(num); /* avoids a float exception */
147			}
148
149			if (op->type == PLAYER)
150			luck = op->stats.luck;
151
152			for (i = 0; i < num; i++) {
153			if (RANDOM()%base < MIN(10, abs(luck)) && !gotlucky) {
154			/* we have a winner */
155			gotlucky++;
156			((luck > 0) ? (luck = 1) : (luck = -1));
157			diff -= luck;
158			if (diff < 1)
159			return(num); /check again/
160			((goodbad) ? (min += luck) : (diff));
161			ran = RANDOM();
162			total += MAX(1, MIN(size, (ran%diff)+min));
163			} else {
164			total += RANDOM()%size+1;
165			}
166			}
167			return(total);
168			}
169
170			/*
171			* Another convenience function. Returns a number between min and max.
172			* It is suggested one use these functions rather than RANDOM()%, as it
173			* would appear that a number of off-by-one-errors exist due to improper
174			* use of %. This should also prevent SIGFPE.
175			*/
176
177			int rndm(int min, int max)
178			{
179			int diff;
180
181			diff = max - min + 1;
182			if (max < 1 \|\| diff < 1)
183			return(min);
184
185			return(RANDOM()%diff+min);
186			}
187
188			/* decay and destroy persihable items in a map */
189
190			void decay_objects(mapstruct *m)
191			{
192			int x, y, destroy;
193			object op, otmp;
194
195			if (m->unique)
196			return;
197
198			for (x=0; x < MAP_WIDTH(m); x++)
199			for (y=0; y < MAP_HEIGHT(m); y++)
200			for (op = get_map_ob(m, x, y); op; op = otmp) {
201			destroy = 0;
202			otmp = op->above;
203			if (QUERY_FLAG(op,FLAG_IS_FLOOR) && QUERY_FLAG(op, FLAG_UNIQUE))
204			break;
205			if (QUERY_FLAG(op, FLAG_IS_FLOOR) \|\|
206			QUERY_FLAG(op, FLAG_OBJ_ORIGINAL) \|\|
207			QUERY_FLAG(op, FLAG_OBJ_SAVE_ON_OVL) \|\|
208			QUERY_FLAG(op, FLAG_UNIQUE) \|\|
209			QUERY_FLAG(op, FLAG_OVERLAY_FLOOR) \|\|
210			QUERY_FLAG(op, FLAG_UNPAID) \|\| IS_LIVE(op))
211			continue;
212			/* otherwise, we decay and destroy */
213			if (IS_WEAPON(op)) {
214			op->stats.dam--;
215			if (op->stats.dam < 0)
216			destroy = 1;
217			} else if (IS_ARMOR(op)) {
218			op->stats.ac--;
219			if (op->stats.ac < 0)
220			destroy = 1;
221			} else if (op->type == FOOD) {
222			op->stats.food -= rndm(5,20);
223			if (op->stats.food < 0)
224			destroy = 1;
225			} else {
226			if (op->material & M_PAPER \|\| op->material & M_LEATHER \|\|
227			op->material & M_WOOD \|\| op->material & M_ORGANIC \|\|
228			op->material & M_CLOTH \|\| op->material & M_LIQUID)
229			destroy = 1;
230			if (op->material & M_IRON && rndm(1,5) == 1)
231			destroy = 1;
232			if (op->material & M_GLASS && rndm(1,2) == 1)
233			destroy = 1;
234			if ((op->material & M_STONE \|\| op->material & M_ADAMANT) &&
235			rndm(1,10) == 1)
236			destroy = 1;
237			if ((op->material & M_SOFT_METAL \|\| op->material & M_BONE) &&
238			rndm(1,3) == 1)
239			destroy = 1;
240			if (op->material & M_ICE && MAP_TEMP(m) > 32)
241			destroy = 1;
242			}
243			/* adjust overall chance below */
244			if (destroy && rndm(0, 1)) {
245			remove_ob(op);
246			free_object(op);
247			}
248			}
249			}
250
251			/* convert materialname to materialtype_t */
252
253			materialtype_t name_to_material(const char name)
254			{
255			materialtype_t mt, nmt;
256
257			mt = NULL;
258			for (nmt = materialt; nmt != NULL && nmt->next != NULL; nmt=nmt->next) {
259			if (strcmp(name, nmt->name) == 0) {
260			mt = nmt;
261			break;
262			}
263			}
264			return mt;
265			}
266
267			/* when doing transmutation of objects, we have to recheck the resistances,
268			* as some that did not apply previously, may apply now.
269			*/
270
271			void transmute_materialname(object op, object change)
272			{
273			materialtype_t *mt;
274			int j;
275
276			if (op->materialname == NULL)
277			return;
278
279			if (change->materialname != NULL &&
280			strcmp(op->materialname, change->materialname))
281			return;
282
283			if (!IS_ARMOR(op))
284			return;
285
286			mt = name_to_material(op->materialname);
287
288			for (j=0; j < NROFATTACKS; j++)
289			if (op->resist[j] == 0 && change->resist[j] != 0) {
290			op->resist[j] += mt->mod[j];
291			if (op->resist[j] > 100)
292			op->resist[j] = 100;
293			if (op->resist[j] < -100)
294			op->resist[j] = -100;
295			}
296			}
297
298			/* set the materialname and type for an item */
299			void set_materialname(object op, int difficulty, materialtype_t nmt)
300			{
301			materialtype_t mt, lmt;
302			int j;
303
304			if (op->materialname != NULL)
305			return;
306
307
308
309			if (nmt == NULL) {
310			lmt = NULL;
311			#ifndef NEW_MATERIAL_CODE
312			for (mt = materialt; mt != NULL && mt->next != NULL; mt=mt->next) {
313			if (op->material & mt->material) {
314			lmt = mt;
315			break;
316			}
317			}
318
319			#else
320			for (mt = materialt; mt != NULL && mt->next != NULL; mt=mt->next) {
321			if (op->material & mt->material && rndm(1, 100) <= mt->chance &&
322			difficulty >= mt->difficulty &&
323			(op->magic >= mt->magic \|\| mt->magic == 0)) {
324			lmt = mt;
325			if (!(IS_WEAPON(op) \|\| IS_ARMOR(op)))
326			break;
327			}
328			}
329			#endif
330			} else {
331			lmt = nmt;
332			}
333
334			if (lmt != NULL) {
335			#ifndef NEW_MATERIAL_CODE
336			op->materialname = add_string(lmt->name);
337			return;
338			#else
339
340			if (op->stats.dam && IS_WEAPON(op)) {
341			op->stats.dam += lmt->damage;
342			if (op->stats.dam < 1)
343			op->stats.dam = 1;
344			}
345			if (op->stats.sp && op->type == BOW)
346			op->stats.sp += lmt->sp;
347			if (op->stats.wc && IS_WEAPON(op))
348			op->stats.wc += lmt->wc;
349			if (IS_ARMOR(op)) {
350			if (op->stats.ac)
351			op->stats.ac += lmt->ac;
352			for (j=0; j < NROFATTACKS; j++)
353			if (op->resist[j] != 0) {
354			op->resist[j] += lmt->mod[j];
355			if (op->resist[j] > 100)
356			op->resist[j] = 100;
357			if (op->resist[j] < -100)
358			op->resist[j] = -100;
359			}
360			}
361			op->materialname = add_string(lmt->name);
362			/* dont make it unstackable if it doesn't need to be */
363			if (IS_WEAPON(op) \|\| IS_ARMOR(op)) {
364			op->weight = (op->weight * lmt->weight)/100;
365			op->value = (op->value * lmt->value)/100;
366			}
367			#endif
368			}
369			}
370
371			/*
372			* Strip out the media tags from a String.
373			* Warning the input string will contain the result string
374			*/
375			void strip_media_tag(char *message){
376			int in_tag=0;
377			char* dest;
378			char* src;
379			src=dest=message;
380			while (*src!='\0'){
381			if (*src=='['){
382			in_tag=1;
383			} else if (in_tag && (*src==']'))
384			in_tag=0;
385			else if (!in_tag){
386			dest=src;
387			dest++;
388			}
389			src++;
390			}
391			*dest='\0';
392			}
393
394			const char* strrstr(const char* haystack, const char* needle){
395			const char* lastneedle;
396			lastneedle=NULL;
397			while((haystack=strstr(haystack,needle))!=NULL){
398			lastneedle=haystack;
399			haystack++;
400			}
401			return lastneedle;
402
403			}
404			#define EOL_SIZE (sizeof("\n")-1)
405			void strip_endline(char* buf){
406			if (strlen(buf)<sizeof("\n")){
407			return;
408			}
409			if (!strcmp(buf+strlen(buf)-EOL_SIZE,"\n"))
410			buf[strlen(buf)-EOL_SIZE]='\0';
411			}
412
413			/**
414			* Replace in string src all occurrences of key by replacement. The resulting
415			* string is put into result; at most resultsize characters (including the
416			* terminating null character) will be written to result.
417			*/
418			void replace(const char src, const char key, const char replacement, char result, size_t resultsize)
419			{
420			size_t resultlen;
421			size_t keylen;
422
423			/* special case to prevent infinite loop if key==replacement=="" */
424			if(strcmp(key, replacement) == 0)
425			{
426			snprintf(result, resultsize, "%s", src);
427			return;
428			}
429
430			keylen = strlen(key);
431
432			resultlen = 0;
433			while(*src != '\0' && resultlen+1 < resultsize)
434			{
435			if(strncmp(src, key, keylen) == 0)
436			{
437			snprintf(result+resultlen, resultsize-resultlen, "%s", replacement);
438			resultlen += strlen(result+resultlen);
439			src += keylen;
440			}
441			else
442			{
443			result[resultlen++] = *src++;
444			}
445			}
446			result[resultlen] = '\0';
447			}
448
449			/**
450			* Taking a string as an argument, mutate it into a string that looks like a list.
451			* a 'list' for the purposes here, is a string of items, seperated by commas, except
452			* for the last entry, which has an 'and' before it, and a full stop (period) after it.
453			* This function will also strip all trailing non alphanumeric characters.
454			* It does not insert an oxford comma.
455			*/
456
457			void make_list_like(char *input) {
458			char *p, tmp[MAX_BUF];
459			int i;
460			if (!input \|\| strlen(input) > MAX_BUF-5) return;
461			/* bad stuff would happen if we continued here, the -5 is to make space for ' and ' */
462
463			strncpy(tmp, input, MAX_BUF-5);
464			/trim all trailing commas, spaces etc./
465			for (i=strlen(tmp); !isalnum(tmp[i]) && i >= 0; i--)
466			tmp[i]='\0';
467			strcat(tmp, ".");
468
469			p=strrchr(tmp, ',');
470			if (p) {
471			*p='\0';
472			strcpy(input, tmp);
473			p++;
474			strcat(input, " and");
475			strcat(input, p);
476			}
477			else strcpy(input, tmp);
478			return;
479			}