src/common/modobject.c

#ifndef lint
static const char RCSid[] = "$Id: modobject.c,v 2.12 2004/07/14 02:37:23 greg Exp $";
#endif
/*
 *  Routines for tracking object modifiers
 *
 *  External symbols declared in object.h
 */

#include "copyright.h"

#include  "standard.h"

#include  "object.h"

#include  "otypes.h"


static struct ohtab {
        int  hsiz;                      /* current table size */
        OBJECT  *htab;                  /* table, if allocated */
}  modtab = {100, NULL}, objtab = {1000, NULL}; /* modifiers and objects */

static int  otndx(char *, struct ohtab *);


OBJECT
objndx(                         /* get object number from pointer */
        OBJREC  *op
)
{
        int  i, j;

        for (i = nobjects>>OBJBLKSHFT; i >= 0; i--) {
                j = op - objblock[i];
                if ((j >= 0) & (j < OBJBLKSIZ))
                        return((i<<OBJBLKSHFT) + j);
        }
        return(OVOID);
}


OBJECT
lastmod(                        /* find modifier definition before obj */
        OBJECT  obj,
        char  *mname
)
{
        OBJREC  *op;
        int  i;

        i = modifier(mname);            /* try hash table first */
        if ((obj == OVOID) | (i < obj))
                return(i);
        for (i = obj; i-- > 0; ) {      /* need to search */
                op = objptr(i);
                if (ismodifier(op->otype) && op->oname[0] == mname[0] &&
                                        !strcmp(op->oname, mname))
                        return(i);
        }
        return(OVOID);
}


OBJECT
modifier(                       /* get a modifier number from its name */
        char  *mname
)
{
        int  ndx;

        ndx = otndx(mname, &modtab);
        return(modtab.htab[ndx]);
}


#ifdef  GETOBJ
OBJECT
object(                         /* get an object number from its name */
        char  *oname
)
{
        int  ndx;

        ndx = otndx(oname, &objtab);
        return(objtab.htab[ndx]);
}
#endif


void
insertobject(                   /* insert new object into our list */
        OBJECT  obj
)
{
        int  i;

        if (ismodifier(objptr(obj)->otype)) {
                i = otndx(objptr(obj)->oname, &modtab);
                modtab.htab[i] = obj;
        }
#ifdef  GETOBJ
        else {
                i = otndx(objptr(obj)->oname, &objtab);
                objtab.htab[i] = obj;
        }
#endif
        for (i = 0; addobjnotify[i] != NULL; i++)
                (*addobjnotify[i])(obj);
}


void
clearobjndx(void)               /* clear object hash tables */
{
        if (modtab.htab != NULL) {
                free((void *)modtab.htab);
                modtab.htab = NULL;
                modtab.hsiz = 100;
        }
        if (objtab.htab != NULL) {
                free((void *)objtab.htab);
                objtab.htab = NULL;
                objtab.hsiz = 100;
        }
}


static int
nexthsiz(                       /* return next hash table size */
        int  oldsiz
)
{
        static int  hsiztab[] = {
                251, 509, 1021, 2039, 4093, 8191, 16381, 0
        };
        int  *hsp;

        for (hsp = hsiztab; *hsp; hsp++)
                if (*hsp > oldsiz)
                        return(*hsp);
        return(oldsiz*2 + 1);           /* not always prime */
}


static int
otndx(                          /* get object table index for name */
        char  *name,
        struct ohtab  *tab
)
{
        OBJECT  *oldhtab;
        int  hval, i;
        int  ndx;

        if (tab->htab == NULL) {                /* new table */
                tab->hsiz = nexthsiz(tab->hsiz);
                tab->htab = (OBJECT *)malloc(tab->hsiz*sizeof(OBJECT));
                if (tab->htab == NULL)
                        error(SYSTEM, "out of memory in otndx");
                ndx = tab->hsiz;
                while (ndx--)                   /* empty it */
                        tab->htab[ndx] = OVOID;
        }
                                        /* look up object */
        hval = shash(name);
tryagain:
        for (i = 0; i < tab->hsiz; i++) {
                ndx = (hval + (unsigned long)i*i) % tab->hsiz;
                if (tab->htab[ndx] == OVOID ||
                                !strcmp(objptr(tab->htab[ndx])->oname, name))
                        return(ndx);
        }
                                        /* table is full, reallocate */
        oldhtab = tab->htab;
        ndx = tab->hsiz;
        tab->htab = NULL;
        while (ndx--)
                if (oldhtab[ndx] != OVOID) {
                        i = otndx(objptr(oldhtab[ndx])->oname, tab);
                        tab->htab[i] = oldhtab[ndx];
                }
        free((void *)oldhtab);
        goto tryagain;                  /* should happen only once! */
}
Revision:	2.13
Committed:	Sat Mar 9 18:53:05 2013 UTC (12 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.12:	+35 -27 lines
Log Message:	Slight efficiency improvement and ansification
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.13	static const char RCSid[] = "$Id: modobject.c,v 2.12 2004/07/14 02:37:23 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* Routines for tracking object modifiers
6	greg	2.7	*
7			* External symbols declared in object.h
8			*/
9
10	greg	2.8	#include "copyright.h"
11	greg	1.1
12			#include "standard.h"
13
14			#include "object.h"
15
16	greg	1.2	#include "otypes.h"
17
18	greg	1.1
19			static struct ohtab {
20			int hsiz; /* current table size */
21			OBJECT htab; / table, if allocated */
22			} modtab = {100, NULL}, objtab = {1000, NULL}; /* modifiers and objects */
23
24	schorsch	2.10	static int otndx(char , struct ohtab );
25	greg	1.3
26	greg	1.1
27	greg	2.9	OBJECT
28	greg	2.13	objndx( /* get object number from pointer */
29			OBJREC *op
30			)
31	greg	1.1	{
32	greg	2.13	int i, j;
33	greg	1.1
34	gwlarson	2.6	for (i = nobjects>>OBJBLKSHFT; i >= 0; i--) {
35	greg	2.3	j = op - objblock[i];
36	greg	2.12	if ((j >= 0) & (j < OBJBLKSIZ))
37	gwlarson	2.6	return((i<<OBJBLKSHFT) + j);
38	greg	2.3	}
39			return(OVOID);
40	greg	1.1	}
41
42
43	greg	2.9	OBJECT
44	greg	2.13	lastmod( /* find modifier definition before obj */
45			OBJECT obj,
46			char *mname
47			)
48	greg	2.3	{
49	greg	2.13	OBJREC *op;
50			int i;
51	greg	2.3
52	greg	2.4	i = modifier(mname); /* try hash table first */
53	greg	2.12	if ((obj == OVOID) \| (i < obj))
54	greg	2.4	return(i);
55			for (i = obj; i-- > 0; ) { /* need to search */
56	greg	2.3	op = objptr(i);
57	greg	2.13	if (ismodifier(op->otype) && op->oname[0] == mname[0] &&
58			!strcmp(op->oname, mname))
59	greg	2.3	return(i);
60			}
61			return(OVOID);
62			}
63
64
65	greg	2.9	OBJECT
66	greg	2.13	modifier( /* get a modifier number from its name */
67			char *mname
68			)
69	greg	1.1	{
70	greg	2.13	int ndx;
71	greg	1.1
72			ndx = otndx(mname, &modtab);
73			return(modtab.htab[ndx]);
74			}
75
76
77	greg	2.3	#ifdef GETOBJ
78	greg	2.9	OBJECT
79	greg	2.13	object( /* get an object number from its name */
80			char *oname
81			)
82	greg	2.3	{
83	greg	2.13	int ndx;
84	greg	2.3
85			ndx = otndx(oname, &objtab);
86			return(objtab.htab[ndx]);
87			}
88			#endif
89
90
91	greg	2.7	void
92	greg	2.13	insertobject( /* insert new object into our list */
93			OBJECT obj
94			)
95	greg	1.1	{
96	greg	2.13	int i;
97	greg	1.1
98			if (ismodifier(objptr(obj)->otype)) {
99			i = otndx(objptr(obj)->oname, &modtab);
100			modtab.htab[i] = obj;
101			}
102	greg	2.3	#ifdef GETOBJ
103			else {
104			i = otndx(objptr(obj)->oname, &objtab);
105			objtab.htab[i] = obj;
106			}
107			#endif
108	greg	1.1	for (i = 0; addobjnotify[i] != NULL; i++)
109			(*addobjnotify[i])(obj);
110			}
111
112
113	greg	2.7	void
114	greg	2.13	clearobjndx(void) /* clear object hash tables */
115	greg	2.7	{
116			if (modtab.htab != NULL) {
117			free((void *)modtab.htab);
118			modtab.htab = NULL;
119			modtab.hsiz = 100;
120			}
121			if (objtab.htab != NULL) {
122			free((void *)objtab.htab);
123			objtab.htab = NULL;
124			objtab.hsiz = 100;
125			}
126			}
127
128
129	greg	1.1	static int
130	greg	2.13	nexthsiz( /* return next hash table size */
131			int oldsiz
132			)
133	greg	1.1	{
134			static int hsiztab[] = {
135			251, 509, 1021, 2039, 4093, 8191, 16381, 0
136			};
137	greg	2.13	int *hsp;
138	greg	1.1
139			for (hsp = hsiztab; *hsp; hsp++)
140			if (*hsp > oldsiz)
141			return(*hsp);
142			return(oldsiz2 + 1); / not always prime */
143			}
144
145
146			static int
147	greg	2.13	otndx( /* get object table index for name */
148			char *name,
149			struct ohtab *tab
150			)
151	greg	1.1	{
152			OBJECT *oldhtab;
153			int hval, i;
154	greg	2.13	int ndx;
155	greg	1.1
156			if (tab->htab == NULL) { /* new table */
157			tab->hsiz = nexthsiz(tab->hsiz);
158			tab->htab = (OBJECT )malloc(tab->hsizsizeof(OBJECT));
159			if (tab->htab == NULL)
160			error(SYSTEM, "out of memory in otndx");
161			ndx = tab->hsiz;
162			while (ndx--) /* empty it */
163			tab->htab[ndx] = OVOID;
164			}
165			/* look up object */
166			hval = shash(name);
167			tryagain:
168			for (i = 0; i < tab->hsiz; i++) {
169	greg	2.11	ndx = (hval + (unsigned long)i*i) % tab->hsiz;
170	greg	1.1	if (tab->htab[ndx] == OVOID \|\|
171			!strcmp(objptr(tab->htab[ndx])->oname, name))
172			return(ndx);
173			}
174			/* table is full, reallocate */
175			oldhtab = tab->htab;
176			ndx = tab->hsiz;
177			tab->htab = NULL;
178			while (ndx--)
179			if (oldhtab[ndx] != OVOID) {
180			i = otndx(objptr(oldhtab[ndx])->oname, tab);
181			tab->htab[i] = oldhtab[ndx];
182			}
183	greg	2.7	free((void *)oldhtab);
184	greg	1.1	goto tryagain; /* should happen only once! */
185			}