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c86edd1d Q |
1 | /* channelindex.c */ |
2 | ||
3 | #include "channel.h" | |
4 | #include "../irc/irc_config.h" | |
5 | #include "../lib/irc_string.h" | |
6 | #include <stdio.h> | |
4ad1cf7a | 7 | #include <string.h> |
c86edd1d Q |
8 | |
9 | #define channelhash(x) (crc32i(x)%CHANNELHASHSIZE) | |
10 | ||
11 | chanindex *chantable[CHANNELHASHSIZE]; | |
12 | sstring *extnames[MAXCHANNELEXTS]; | |
13 | ||
14 | unsigned int channelmarker; | |
15 | ||
16 | void initchannelindex() { | |
17 | memset(chantable,0,sizeof(chantable)); | |
18 | memset(extnames,0,sizeof(extnames)); | |
19 | channelmarker=0; | |
20 | } | |
21 | ||
22 | chanindex *findchanindex(const char *name) { | |
23 | chanindex *cip; | |
24 | int hash=channelhash(name); | |
25 | ||
26 | for (cip=chantable[hash];cip;cip=cip->next) { | |
27 | if (!ircd_strcmp(cip->name->content,name)) { | |
28 | return cip; | |
29 | } | |
30 | } | |
31 | ||
32 | return NULL; | |
33 | } | |
34 | ||
35 | chanindex *findorcreatechanindex(const char *name) { | |
36 | chanindex *cip; | |
37 | int hash=channelhash(name); | |
38 | int i; | |
39 | ||
40 | for (cip=chantable[hash];cip;cip=cip->next) { | |
41 | if (!ircd_strcmp(cip->name->content,name)) { | |
42 | return cip; | |
43 | } | |
44 | } | |
45 | ||
46 | cip=getchanindex(); | |
47 | ||
48 | cip->name=getsstring(name,CHANNELLEN); | |
49 | cip->channel=NULL; | |
50 | cip->marker=0; | |
51 | cip->next=chantable[hash]; | |
52 | chantable[hash]=cip; | |
53 | ||
54 | for(i=0;i<MAXCHANNELEXTS;i++) { | |
55 | cip->exts[i]=NULL; | |
56 | } | |
57 | ||
58 | return cip; | |
59 | } | |
60 | ||
61 | void releasechanindex(chanindex *cip) { | |
62 | int i; | |
63 | chanindex **cih; | |
64 | int hash; | |
65 | ||
66 | /* If any module is still using the channel, do nothing */ | |
67 | /* Same if the channel is still present on the network */ | |
68 | ||
69 | if (cip->channel!=NULL) { | |
70 | return; | |
71 | } | |
72 | ||
73 | for (i=0;i<MAXCHANNELEXTS;i++) { | |
74 | if (cip->exts[i]!=NULL) { | |
75 | return; | |
76 | } | |
77 | } | |
78 | ||
79 | /* Now remove the index record from the index. */ | |
80 | hash=channelhash(cip->name->content); | |
81 | ||
82 | for(cih=&(chantable[hash]);*cih;cih=&((*cih)->next)) { | |
83 | if (*cih==cip) { | |
84 | (*cih)=cip->next; | |
85 | freesstring(cip->name); | |
86 | freechanindex(cip); | |
87 | return; | |
88 | } | |
89 | } | |
90 | ||
91 | Error("channel",ERR_ERROR,"Tried to release chanindex record for %s not found in hash",cip->name->content); | |
92 | } | |
93 | ||
94 | int registerchanext(const char *name) { | |
95 | int i; | |
96 | ||
97 | if (findchanext(name)!=-1) { | |
98 | Error("channel",ERR_WARNING,"Tried to register duplicate extension %s",name); | |
99 | return -1; | |
100 | } | |
101 | ||
102 | for (i=0;i<MAXCHANNELEXTS;i++) { | |
103 | if (extnames[i]==NULL) { | |
104 | extnames[i]=getsstring(name,100); | |
105 | return i; | |
106 | } | |
107 | } | |
108 | ||
109 | Error("channel",ERR_WARNING,"Tried to register too many extensions: %s",name); | |
110 | return -1; | |
111 | } | |
112 | ||
113 | int findchanext(const char *name) { | |
114 | int i; | |
115 | ||
116 | for (i=0;i<MAXCHANNELEXTS;i++) { | |
117 | if (extnames[i]!=NULL && !ircd_strcmp(name,extnames[i]->content)) { | |
118 | return i; | |
119 | } | |
120 | } | |
121 | ||
122 | return -1; | |
123 | } | |
124 | ||
125 | void releasechanext(int index) { | |
126 | int i; | |
127 | chanindex *cip,*ncip; | |
128 | ||
129 | freesstring(extnames[index]); | |
130 | extnames[index]=NULL; | |
131 | ||
132 | for (i=0;i<CHANNELHASHSIZE;i++) { | |
133 | for (cip=chantable[i];cip;cip=ncip) { | |
134 | /* CAREFUL: deleting items from chains you're walking is bad */ | |
135 | ncip=cip->next; | |
136 | if (cip->exts[index]!=NULL) { | |
137 | cip->exts[index]=NULL; | |
138 | releasechanindex(cip); | |
139 | } | |
140 | } | |
141 | } | |
142 | } | |
143 | ||
144 | unsigned int nextchanmarker() { | |
145 | int i; | |
146 | chanindex *cip; | |
147 | ||
148 | channelmarker++; | |
149 | if (!channelmarker) { | |
150 | /* If we wrapped to zero, zap the marker on all records */ | |
151 | for (i=0;i<CHANNELHASHSIZE;i++) | |
152 | for (cip=chantable[i];cip;cip=cip->next) | |
153 | cip->marker=0; | |
154 | channelmarker++; | |
155 | } | |
156 | ||
157 | return channelmarker; | |
158 | } |