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.
9 #define PAIRMAX 1008 /* arbitrary on PBLKSIZ-N */
10 #define SPLTMAX 10 /* maximum allowed splits */
11 /* for a single insertion */
13 #define DIRFEXT ".sdbm_dir"
15 #define DIRFEXT ".dir"
17 #define PAGFEXT ".pag"
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 */
35 #define DBM_RDONLY 0x1 /* data base open read-only */
36 #define DBM_IOERR 0x2 /* data base I/O error */
41 #define sdbm_rdonly(db) ((db)->flags & DBM_RDONLY)
42 #define sdbm_error(db) ((db)->flags & DBM_IOERR)
44 #define sdbm_clearerr(db) ((db)->flags &= ~DBM_IOERR) /* ouch */
46 #define sdbm_dirfno(db) ((db)->dirf)
47 #define sdbm_pagfno(db) ((db)->pagf)
54 EXTCONST datum nullitem
60 #if defined(__STDC__) || defined(__cplusplus) || defined(CAN_PROTOTYPE)
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 *));
82 extern int sdbm_exists proto((DBM *, datum));
87 extern DBM *sdbm_prep proto((char *, char *, int, int));
88 extern long sdbm_hash proto((char *, int));
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
102 /* Most of the following is stolen from perl.h. We don't include
103 perl.h here because we just want the portability parts of perl.h,
106 #ifndef H_PERL /* Include guard */
107 #include "embed.h" /* Follow all the global renamings. */
110 * The following contortions are brought to you on behalf of all the
111 * standards, semi-standards, de facto standards, not-so-de-facto standards
112 * of the world, as well as all the other botches anyone ever thought of.
113 * The basic theory is that if we work hard enough here, the rest of the
114 * code can be a lot prettier. Well, so much for theory. Sorry, Henry...
120 # include <net/errno.h>
124 #if defined(__STDC__) || defined(_AIX) || defined(__stdc__) || defined(__cplusplus)
125 # define STANDARD_C 1
132 #if defined(I_UNISTD)
142 # if !defined(MSDOS) && !defined(WIN32) && !defined(VMS)
143 # ifdef PARAM_NEEDS_TYPES
144 # include <sys/types.h>
146 # include <sys/param.h>
150 #ifndef _TYPES_ /* If types.h defines this it's easy. */
151 # ifndef major /* Does everyone's types.h define this? */
152 # include <sys/types.h>
156 #include <sys/stat.h>
160 # define SEEK_SET L_SET
162 # define SEEK_SET 0 /* Wild guess. */
166 /* Use all the "standard" definitions? */
167 #if defined(STANDARD_C) && defined(I_STDLIB)
169 #endif /* STANDARD_C */
171 #define MEM_SIZE Size_t
173 /* This comes after <stdlib.h> so we don't try to change the standard
174 * library prototypes; we'll use our own instead. */
176 #if defined(MYMALLOC) && !defined(PERL_POLLUTE_MALLOC)
177 # define malloc Perl_malloc
178 # define calloc Perl_calloc
179 # define realloc Perl_realloc
180 # define free Perl_mfree
182 Malloc_t Perl_malloc proto((MEM_SIZE nbytes));
183 Malloc_t Perl_calloc proto((MEM_SIZE elements, MEM_SIZE size));
184 Malloc_t Perl_realloc proto((Malloc_t where, MEM_SIZE nbytes));
185 Free_t Perl_mfree proto((Malloc_t where));
186 #endif /* MYMALLOC */
193 # include <strings.h>
205 # if !defined(STANDARD_C) && !defined(I_STRING) && !defined(I_MEMORY)
207 extern char * memcpy proto((char*, char*, int));
213 # define memcpy(d,s,l) bcopy(s,d,l)
215 # define memcpy(d,s,l) my_bcopy(s,d,l)
218 #endif /* HAS_MEMCPY */
221 # if !defined(STANDARD_C) && !defined(I_STRING) && !defined(I_MEMORY)
223 extern char *memset proto((char*, int, int));
226 # define memzero(d,l) memset(d,0,l)
230 # define memzero(d,l) bzero(d,l)
232 # define memzero(d,l) my_bzero(d,l)
235 #endif /* HAS_MEMSET */
237 #if defined(mips) && defined(ultrix) && !defined(__STDC__)
241 #if defined(HAS_MEMCMP) && defined(HAS_SANE_MEMCMP)
242 # if !defined(STANDARD_C) && !defined(I_STRING) && !defined(I_MEMORY)
244 extern int memcmp proto((char*, char*, int));
248 # pragma function(memcmp)
252 /* maybe we should have included the full embedding header... */
254 # define memcmp my_memcmp
256 # define memcmp Perl_my_memcmp
259 extern int memcmp proto((char*, char*, int));
262 #endif /* HAS_MEMCMP */
266 # define bcmp(s1,s2,l) memcmp(s1,s2,l)
268 #endif /* !HAS_BCMP */
271 # define memNE(s1,s2,l) (memcmp(s1,s2,l))
272 # define memEQ(s1,s2,l) (!memcmp(s1,s2,l))
274 # define memNE(s1,s2,l) (bcmp(s1,s2,l))
275 # define memEQ(s1,s2,l) (!bcmp(s1,s2,l))
282 # include <netinet/in.h>
286 #endif /* Include guard */