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comparison cdb.c @ 1:41b9b6a160d1

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access functions, use all 32 bits for anything to do with a mapped cdb file
author Henry S. Thompson <ht@inf.ed.ac.uk>
date Wed, 29 Jan 2025 12:34:14 +0000
parents 2cb46628feec
children 0e21568dec72
comparison
equal deleted inserted replaced
0:2cb46628feec 1:41b9b6a160d1
7 #include "error.h" 7 #include "error.h"
8 #include "seek.h" 8 #include "seek.h"
9 #include "byte.h" 9 #include "byte.h"
10 #include "cdb.h" 10 #include "cdb.h"
11 11
12 void cdb_free(struct cdb *c) 12
13 static Cdb c;
14
15 Cdb* cdb_new(void)
16 {
17 return &c;
18 }
19
20 void cdb_free(Cdb *c)
13 { 21 {
14 if (c->map) { 22 if (c->map) {
15 munmap(c->map,c->size); 23 munmap(c->map,c->size);
16 c->map = 0; 24 c->map = 0;
17 } 25 }
18 } 26 }
19 27
20 void cdb_findstart(struct cdb *c) 28 uint32 cdb_len() {
29 return c.dlen;
30 }
31
32 uint32 cdb_pos() {
33 return c.dpos;
34 }
35
36 char *cdb_mmap() {
37 return c.map;
38 }
39
40 uint32 cdb_msize() {
41 return c.size;
42 }
43
44 void cdb_findstart(Cdb *c)
21 { 45 {
22 c->loop = 0; 46 c->loop = 0;
23 } 47 }
24 48
25 void cdb_init(struct cdb *c,int fd) 49 void cdb_init(Cdb *c,int fd)
26 { 50 {
27 struct stat st; 51 struct stat st;
28 char *x; 52 char *x;
29 53
30 cdb_free(c); 54 cdb_free(c);
39 c->map = x; 63 c->map = x;
40 } 64 }
41 } 65 }
42 } 66 }
43 67
44 int cdb_read(struct cdb *c,char *buf,unsigned int len,uint32 pos) 68 int cdb_read(Cdb *c,char *buf,unsigned int len,uint32 pos)
45 { 69 {
46 if (c->map) { 70 if (c->map) {
47 if ((pos > c->size) || (c->size - pos < len)) goto FORMAT; 71 if ((pos > c->size) || (c->size - pos < len)) goto FORMAT;
48 byte_copy(buf,len,c->map + pos); 72 byte_copy(buf,len,c->map + pos);
49 } 73 }
65 FORMAT: 89 FORMAT:
66 errno = error_proto; 90 errno = error_proto;
67 return -1; 91 return -1;
68 } 92 }
69 93
70 static int match(struct cdb *c,char *key,unsigned int len,uint32 pos) 94 static int match(Cdb *c,char *key,unsigned int len,uint32 pos)
71 { 95 {
72 char buf[32]; 96 char buf[32];
73 int n; 97 int n;
74 98
75 while (len > 0) { 99 while (len > 0) {
82 len -= n; 106 len -= n;
83 } 107 }
84 return 1; 108 return 1;
85 } 109 }
86 110
87 int cdb_findnext(struct cdb *c,char *key,unsigned int len) 111 int cdb_findnext(Cdb *c,char *key,unsigned int len)
88 { 112 {
89 char buf[8]; 113 char buf[8];
90 uint32 pos; 114 uint32 pos;
91 uint32 u; 115 uint32 u;
92 116
127 } 151 }
128 152
129 return 0; 153 return 0;
130 } 154 }
131 155
132 int cdb_find(struct cdb *c,char *key,unsigned int len) 156 int cdb_find(Cdb *c,char *key,unsigned int len)
133 { 157 {
134 cdb_findstart(c); 158 cdb_findstart(c);
135 return cdb_findnext(c,key,len); 159 return cdb_findnext(c,key,len);
136 } 160 }