1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/* $Id: refstr.c,v 1.3 2009/06/03 01:10:51 ellson Exp $ $Revision: 1.3 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#include <cghdr.h>
#ifdef DMALLOC
#include "dmalloc.h"
#endif
/*
* reference counted strings.
*/
static unsigned long HTML_BIT; /* msbit of unsigned long */
static unsigned long CNT_BITS; /* complement of HTML_BIT */
typedef struct refstr_t {
Dtlink_t link;
unsigned long refcnt;
char *s;
char store[1]; /* this is actually a dynamic array */
} refstr_t;
static Dtdisc_t Refstrdisc = {
offsetof(refstr_t, s), /* key */
-1, /* size */
0, /* link offset */
NIL(Dtmake_f),
agdictobjfree,
NIL(Dtcompar_f),
NIL(Dthash_f),
agdictobjmem,
NIL(Dtevent_f)
};
static Dict_t *Refdict_default;
/* refdict:
* Return the string dictionary associated with g.
* If necessary, create it.
* As a side-effect, set html masks. This assumes 8-bit bytes.
*/
static Dict_t *refdict(Agraph_t * g)
{
Dict_t **dictref;
if (g)
dictref = &(g->clos->strdict);
else
dictref = &Refdict_default;
if (*dictref == NIL(Dict_t *)) {
*dictref = agdtopen(g, &Refstrdisc, Dttree);
HTML_BIT = ((unsigned int) 1) << (sizeof(unsigned int) * 8 - 1);
CNT_BITS = ~HTML_BIT;
}
return *dictref;
}
void agstrclose(Agraph_t * g)
{
agdtclose(g, refdict(g));
}
static refstr_t *refsymbind(Dict_t * strdict, char *s)
{
refstr_t key, *r;
key.s = s;
r = (refstr_t *) dtsearch(strdict, &key);
return r;
}
static char *refstrbind(Dict_t * strdict, char *s)
{
refstr_t *r;
r = refsymbind(strdict, s);
if (r)
return r->s;
else
return NIL(char *);
}
char *agstrbind(Agraph_t * g, char *s)
{
return refstrbind(refdict(g), s);
}
char *agstrdup(Agraph_t * g, char *s)
{
refstr_t *r;
Dict_t *strdict;
size_t sz;
if (s == NIL(char *))
return NIL(char *);
strdict = refdict(g);
r = refsymbind(strdict, s);
if (r)
r->refcnt++;
else {
sz = sizeof(refstr_t) + strlen(s);
if (g)
r = (refstr_t *) agalloc(g, sz);
else
r = (refstr_t *) malloc(sz);
r->refcnt = 1;
strcpy(r->store, s);
r->s = r->store;
dtinsert(strdict, r);
}
return r->s;
}
char *agstrdup_html(Agraph_t * g, char *s)
{
refstr_t *r;
Dict_t *strdict;
size_t sz;
if (s == NIL(char *))
return NIL(char *);
strdict = refdict(g);
r = refsymbind(strdict, s);
if (r)
r->refcnt++;
else {
sz = sizeof(refstr_t) + strlen(s);
if (g)
r = (refstr_t *) agalloc(g, sz);
else
r = (refstr_t *) malloc(sz);
r->refcnt = 1 | HTML_BIT;
strcpy(r->store, s);
r->s = r->store;
dtinsert(strdict, r);
}
return r->s;
}
int agstrfree(Agraph_t * g, char *s)
{
refstr_t *r;
Dict_t *strdict;
if (s == NIL(char *))
return FAILURE;
strdict = refdict(g);
r = refsymbind(strdict, s);
if (r && (r->s == s)) {
r->refcnt--;
if ((r->refcnt && CNT_BITS) == 0) {
agdtdelete(g, strdict, r);
/*
if (g) agfree(g,r);
else free(r);
*/
}
}
if (r == NIL(refstr_t *))
return FAILURE;
return SUCCESS;
}
/* aghtmlstr:
* Return true if s is an HTML string.
* We assume s points to the datafield store[0] of a refstr.
*/
int aghtmlstr(char *s)
{
refstr_t *key;
if (s == NULL)
return 0;
key = (refstr_t *) (s - offsetof(refstr_t, store[0]));
return (key->refcnt & HTML_BIT);
}
#ifdef DEBUG
static int refstrprint(Dict_t * dict, void *ptr, void *user)
{
refstr_t *r;
NOTUSED(dict);
r = ptr;
NOTUSED(user);
write(2, r->s, strlen(r->s));
write(2, "\n", 1);
return 0;
}
void agrefstrdump(Agraph_t * g)
{
dtwalk(Refdict_default, refstrprint, 0);
}
#endif
|
