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1 | /* |
2 | * sdbm - ndbm work-alike hashed database library |
3 | * based on Per-Ake Larson's Dynamic Hashing algorithms. BIT 18 (1978). |
4 | * author: oz@nexus.yorku.ca |
5 | * status: public domain. |
6 | */ |
7 | #define DBLKSIZ 4096 |
8 | #define PBLKSIZ 1024 |
9 | #define PAIRMAX 1008 /* arbitrary on PBLKSIZ-N */ |
10 | #define SPLTMAX 10 /* maximum allowed splits */ |
11 | /* for a single insertion */ |
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12 | #ifdef VMS |
13 | #define DIRFEXT ".sdbm_dir" |
14 | #else |
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15 | #define DIRFEXT ".dir" |
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16 | #endif |
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17 | #define PAGFEXT ".pag" |
18 | |
19 | typedef struct { |
20 | int dirf; /* directory file descriptor */ |
21 | int pagf; /* page file descriptor */ |
22 | int flags; /* status/error flags, see below */ |
23 | long maxbno; /* size of dirfile in bits */ |
24 | long curbit; /* current bit number */ |
25 | long hmask; /* current hash mask */ |
26 | long blkptr; /* current block for nextkey */ |
27 | int keyptr; /* current key for nextkey */ |
28 | long blkno; /* current page to read/write */ |
29 | long pagbno; /* current page in pagbuf */ |
30 | char pagbuf[PBLKSIZ]; /* page file block buffer */ |
31 | long dirbno; /* current block in dirbuf */ |
32 | char dirbuf[DBLKSIZ]; /* directory file block buffer */ |
33 | } DBM; |
34 | |
35 | #define DBM_RDONLY 0x1 /* data base open read-only */ |
36 | #define DBM_IOERR 0x2 /* data base I/O error */ |
37 | |
38 | /* |
39 | * utility macros |
40 | */ |
41 | #define sdbm_rdonly(db) ((db)->flags & DBM_RDONLY) |
42 | #define sdbm_error(db) ((db)->flags & DBM_IOERR) |
43 | |
44 | #define sdbm_clearerr(db) ((db)->flags &= ~DBM_IOERR) /* ouch */ |
45 | |
46 | #define sdbm_dirfno(db) ((db)->dirf) |
47 | #define sdbm_pagfno(db) ((db)->pagf) |
48 | |
49 | typedef struct { |
50 | char *dptr; |
51 | int dsize; |
52 | } datum; |
53 | |
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54 | EXTCONST datum nullitem |
55 | #ifdef DOINIT |
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56 | = {0, 0} |
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57 | #endif |
58 | ; |
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59 | |
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60 | #if defined(__STDC__) || defined(__cplusplus) || defined(CAN_PROTOTYPE) |
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61 | #define proto(p) p |
62 | #else |
63 | #define proto(p) () |
64 | #endif |
65 | |
66 | /* |
67 | * flags to sdbm_store |
68 | */ |
69 | #define DBM_INSERT 0 |
70 | #define DBM_REPLACE 1 |
71 | |
72 | /* |
73 | * ndbm interface |
74 | */ |
75 | extern DBM *sdbm_open proto((char *, int, int)); |
76 | extern void sdbm_close proto((DBM *)); |
77 | extern datum sdbm_fetch proto((DBM *, datum)); |
78 | extern int sdbm_delete proto((DBM *, datum)); |
79 | extern int sdbm_store proto((DBM *, datum, datum, int)); |
80 | extern datum sdbm_firstkey proto((DBM *)); |
81 | extern datum sdbm_nextkey proto((DBM *)); |
f4b9d880 |
82 | extern int sdbm_exists proto((DBM *, datum)); |
463ee0b2 |
83 | |
84 | /* |
85 | * other |
86 | */ |
87 | extern DBM *sdbm_prep proto((char *, char *, int, int)); |
88 | extern long sdbm_hash proto((char *, int)); |
89 | |
90 | #ifndef SDBM_ONLY |
ff68c719 |
91 | #define dbm_open sdbm_open |
92 | #define dbm_close sdbm_close |
93 | #define dbm_fetch sdbm_fetch |
94 | #define dbm_store sdbm_store |
95 | #define dbm_delete sdbm_delete |
96 | #define dbm_firstkey sdbm_firstkey |
97 | #define dbm_nextkey sdbm_nextkey |
98 | #define dbm_error sdbm_error |
99 | #define dbm_clearerr sdbm_clearerr |
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100 | #endif |
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101 | |
102 | /* Most of the following is stolen from perl.h. */ |
103 | #ifndef H_PERL /* Include guard */ |
104 | |
105 | /* |
106 | * The following contortions are brought to you on behalf of all the |
107 | * standards, semi-standards, de facto standards, not-so-de-facto standards |
108 | * of the world, as well as all the other botches anyone ever thought of. |
109 | * The basic theory is that if we work hard enough here, the rest of the |
110 | * code can be a lot prettier. Well, so much for theory. Sorry, Henry... |
111 | */ |
112 | |
113 | #include <errno.h> |
114 | #ifdef HAS_SOCKET |
115 | # ifdef I_NET_ERRNO |
116 | # include <net/errno.h> |
117 | # endif |
118 | #endif |
119 | |
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120 | #if defined(__STDC__) || defined(_AIX) || defined(__stdc__) || defined(__cplusplus) |
121 | # define STANDARD_C 1 |
122 | #endif |
123 | |
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124 | #include <stdio.h> |
125 | #include <ctype.h> |
126 | #include <setjmp.h> |
127 | |
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128 | #if defined(I_UNISTD) |
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129 | #include <unistd.h> |
130 | #endif |
131 | |
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132 | #ifdef VMS |
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133 | # include <file.h> |
134 | # include <unixio.h> |
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135 | #endif |
136 | |
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137 | #ifdef I_SYS_PARAM |
138 | # if !defined(MSDOS) && !defined(WIN32) && !defined(VMS) |
139 | # ifdef PARAM_NEEDS_TYPES |
140 | # include <sys/types.h> |
141 | # endif |
142 | # include <sys/param.h> |
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143 | # endif |
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144 | #endif |
145 | |
146 | #ifndef _TYPES_ /* If types.h defines this it's easy. */ |
147 | # ifndef major /* Does everyone's types.h define this? */ |
148 | # include <sys/types.h> |
149 | # endif |
150 | #endif |
151 | |
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152 | #include <sys/stat.h> |
153 | |
154 | #ifndef SEEK_SET |
155 | # ifdef L_SET |
156 | # define SEEK_SET L_SET |
157 | # else |
158 | # define SEEK_SET 0 /* Wild guess. */ |
159 | # endif |
160 | #endif |
161 | |
162 | /* Use all the "standard" definitions? */ |
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163 | #if defined(STANDARD_C) && defined(I_STDLIB) |
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164 | # include <stdlib.h> |
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165 | #endif /* STANDARD_C */ |
166 | |
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167 | #define MEM_SIZE Size_t |
168 | |
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169 | /* This comes after <stdlib.h> so we don't try to change the standard |
170 | * library prototypes; we'll use our own instead. */ |
171 | |
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172 | #if defined(MYMALLOC) && !defined(PERL_POLLUTE_MALLOC) |
86058a2d |
173 | # define malloc Perl_malloc |
174 | # define calloc Perl_calloc |
175 | # define realloc Perl_realloc |
176 | # define free Perl_mfree |
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177 | |
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178 | Malloc_t Perl_malloc proto((MEM_SIZE nbytes)); |
179 | Malloc_t Perl_calloc proto((MEM_SIZE elements, MEM_SIZE size)); |
180 | Malloc_t Perl_realloc proto((Malloc_t where, MEM_SIZE nbytes)); |
181 | Free_t Perl_mfree proto((Malloc_t where)); |
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182 | #endif /* MYMALLOC */ |
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183 | |
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184 | #ifdef I_STRING |
185 | #include <string.h> |
186 | #else |
187 | #include <strings.h> |
188 | #endif |
189 | |
190 | #ifdef I_MEMORY |
191 | #include <memory.h> |
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192 | #endif |
193 | |
194 | #ifdef __cplusplus |
195 | #define HAS_MEMCPY |
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196 | #endif |
197 | |
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198 | #ifdef HAS_MEMCPY |
199 | # if !defined(STANDARD_C) && !defined(I_STRING) && !defined(I_MEMORY) |
200 | # ifndef memcpy |
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201 | extern char * memcpy proto((char*, char*, int)); |
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202 | # endif |
203 | # endif |
204 | #else |
205 | # ifndef memcpy |
206 | # ifdef HAS_BCOPY |
207 | # define memcpy(d,s,l) bcopy(s,d,l) |
208 | # else |
209 | # define memcpy(d,s,l) my_bcopy(s,d,l) |
210 | # endif |
211 | # endif |
212 | #endif /* HAS_MEMCPY */ |
213 | |
214 | #ifdef HAS_MEMSET |
215 | # if !defined(STANDARD_C) && !defined(I_STRING) && !defined(I_MEMORY) |
216 | # ifndef memset |
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217 | extern char *memset proto((char*, int, int)); |
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218 | # endif |
219 | # endif |
220 | # define memzero(d,l) memset(d,0,l) |
221 | #else |
222 | # ifndef memzero |
223 | # ifdef HAS_BZERO |
224 | # define memzero(d,l) bzero(d,l) |
225 | # else |
226 | # define memzero(d,l) my_bzero(d,l) |
227 | # endif |
228 | # endif |
229 | #endif /* HAS_MEMSET */ |
230 | |
36477c24 |
231 | #if defined(mips) && defined(ultrix) && !defined(__STDC__) |
232 | # undef HAS_MEMCMP |
233 | #endif |
234 | |
235 | #if defined(HAS_MEMCMP) && defined(HAS_SANE_MEMCMP) |
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236 | # if !defined(STANDARD_C) && !defined(I_STRING) && !defined(I_MEMORY) |
237 | # ifndef memcmp |
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238 | extern int memcmp proto((char*, char*, int)); |
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239 | # endif |
240 | # endif |
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241 | # ifdef BUGGY_MSC |
242 | # pragma function(memcmp) |
243 | # endif |
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244 | #else |
245 | # ifndef memcmp |
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246 | /* maybe we should have included the full embedding header... */ |
36477c24 |
247 | # ifdef NO_EMBED |
248 | # define memcmp my_memcmp |
249 | # else |
250 | # define memcmp Perl_my_memcmp |
251 | # endif |
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252 | #ifndef __cplusplus |
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253 | extern int memcmp proto((char*, char*, int)); |
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254 | #endif |
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255 | # endif |
256 | #endif /* HAS_MEMCMP */ |
257 | |
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258 | #ifndef HAS_BCMP |
259 | # ifndef bcmp |
260 | # define bcmp(s1,s2,l) memcmp(s1,s2,l) |
261 | # endif |
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262 | #endif /* !HAS_BCMP */ |
263 | |
264 | #ifdef HAS_MEMCMP |
265 | # define memNE(s1,s2,l) (memcmp(s1,s2,l)) |
266 | # define memEQ(s1,s2,l) (!memcmp(s1,s2,l)) |
267 | #else |
268 | # define memNE(s1,s2,l) (bcmp(s1,s2,l)) |
269 | # define memEQ(s1,s2,l) (!bcmp(s1,s2,l)) |
270 | #endif |
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271 | |
272 | #ifdef I_NETINET_IN |
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273 | # ifdef VMS |
274 | # include <in.h> |
275 | # else |
276 | # include <netinet/in.h> |
277 | # endif |
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278 | #endif |
279 | |
280 | #endif /* Include guard */ |
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281 | |