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#ifndef PERL_SDBM_FILE_SDBM_H_ 8#define PERL_SDBM_FILE_SDBM_H_ 9 10#define DBLKSIZ 4096 11#define PBLKSIZ 1024 12#define PAIRMAX 1008 /* arbitrary on PBLKSIZ-N */ 13#define SPLTMAX 10 /* maximum allowed splits */ 14 /* for a single insertion */ 15#ifdef VMS 16#define DIRFEXT ".sdbm_dir" 17#else 18#define DIRFEXT ".dir" 19#endif 20#define PAGFEXT ".pag" 21 22typedef struct { 23 int dirf; /* directory file descriptor */ 24 int pagf; /* page file descriptor */ 25 int flags; /* status/error flags, see below */ 26 long maxbno; /* size of dirfile in bits */ 27 long curbit; /* current bit number */ 28 long hmask; /* current hash mask */ 29 long blkptr; /* current block for nextkey */ 30 int keyptr; /* current key for nextkey */ 31 long blkno; /* current page to read/write */ 32 long pagbno; /* current page in pagbuf */ 33 char pagbuf[PBLKSIZ]; /* page file block buffer */ 34 long dirbno; /* current block in dirbuf */ 35 char dirbuf[DBLKSIZ]; /* directory file block buffer */ 36} DBM; 37 38#define DBM_RDONLY 0x1 /* data base open read-only */ 39#define DBM_IOERR 0x2 /* data base I/O error */ 40 41/* 42 * utility macros 43 */ 44#define sdbm_rdonly(db) ((db)->flags & DBM_RDONLY) 45#define sdbm_error(db) ((db)->flags & DBM_IOERR) 46 47#define sdbm_clearerr(db) ((db)->flags &= ~DBM_IOERR) /* ouch */ 48 49#define sdbm_dirfno(db) ((db)->dirf) 50#define sdbm_pagfno(db) ((db)->pagf) 51 52typedef struct { 53 const char *dptr; 54 int dsize; 55} datum; 56 57extern const datum nullitem; 58 59/* 60 * flags to sdbm_store 61 */ 62#define DBM_INSERT 0 63#define DBM_REPLACE 1 64 65/* 66 * ndbm interface 67 */ 68extern DBM *sdbm_open(char *, int, int); 69extern void sdbm_close(DBM *); 70extern datum sdbm_fetch(DBM *, datum); 71extern int sdbm_delete(DBM *, datum); 72extern int sdbm_store(DBM *, datum, datum, int); 73extern datum sdbm_firstkey(DBM *); 74extern datum sdbm_nextkey(DBM *); 75extern int sdbm_exists(DBM *, datum); 76 77/* 78 * other 79 */ 80extern DBM *sdbm_prep(char *, char *, int, int); 81extern long sdbm_hash(const char *, int); 82 83#ifndef SDBM_ONLY 84#define dbm_open sdbm_open 85#define dbm_close sdbm_close 86#define dbm_fetch sdbm_fetch 87#define dbm_store sdbm_store 88#define dbm_delete sdbm_delete 89#define dbm_firstkey sdbm_firstkey 90#define dbm_nextkey sdbm_nextkey 91#define dbm_error sdbm_error 92#define dbm_clearerr sdbm_clearerr 93#endif 94 95/* Most of the following is stolen from perl.h. We don't include 96 perl.h here because we just want the portability parts of perl.h, 97 not everything else. 98*/ 99#ifndef H_PERL /* Include guard */ 100#include "embed.h" /* Follow all the global renamings. */ 101 102/* 103 * The following contortions are brought to you on behalf of all the 104 * standards, semi-standards, de facto standards, not-so-de-facto standards 105 * of the world, as well as all the other botches anyone ever thought of. 106 * The basic theory is that if we work hard enough here, the rest of the 107 * code can be a lot prettier. Well, so much for theory. Sorry, Henry... 108 */ 109 110#include <errno.h> 111#ifdef HAS_SOCKET 112# ifdef I_NET_ERRNO 113# include <net/errno.h> 114# endif 115#endif 116 117#include <stdio.h> 118#include <ctype.h> 119#include <setjmp.h> 120 121#if defined(I_UNISTD) 122#include <unistd.h> 123#endif 124 125#ifdef VMS 126# include <file.h> 127# include <unixio.h> 128#endif 129 130#ifdef I_SYS_PARAM 131# if !defined(WIN32) && !defined(VMS) 132# ifdef PARAM_NEEDS_TYPES 133# include <sys/types.h> 134# endif 135# include <sys/param.h> 136# endif 137#endif 138 139#ifndef _TYPES_ /* If types.h defines this it's easy. */ 140# ifndef major /* Does everyone's types.h define this? */ 141# include <sys/types.h> 142# endif 143#endif 144 145#include <sys/stat.h> 146 147#ifndef SEEK_SET 148# ifdef L_SET 149# define SEEK_SET L_SET 150# else 151# define SEEK_SET 0 /* Wild guess. */ 152# endif 153#endif 154 155/* Use all the "standard" definitions */ 156#include <stdlib.h> 157 158#define MEM_SIZE Size_t 159 160/* This comes after <stdlib.h> so we don't try to change the standard 161 * library prototypes; we'll use our own instead. */ 162 163#if defined(MYMALLOC) && !defined(PERL_POLLUTE_MALLOC) 164# define malloc Perl_malloc 165# define calloc Perl_calloc 166# define realloc Perl_realloc 167# define free Perl_mfree 168 169#ifdef __cplusplus 170extern "C" { 171#endif 172 173Malloc_t Perl_malloc(MEM_SIZE nbytes); 174Malloc_t Perl_calloc(MEM_SIZE elements, MEM_SIZE size); 175Malloc_t Perl_realloc(Malloc_t where, MEM_SIZE nbytes); 176Free_t Perl_mfree(Malloc_t where); 177 178#ifdef __cplusplus 179} 180#endif 181 182#endif /* MYMALLOC */ 183 184#include <string.h> 185 186#define memzero(d,l) memset(d,0,l) 187 188#ifdef BUGGY_MSC 189# pragma function(memcmp) 190#endif 191 192#define memNE(s1,s2,l) (memcmp(s1,s2,l)) 193#define memEQ(s1,s2,l) (!memcmp(s1,s2,l)) 194 195#ifdef I_NETINET_IN 196# ifdef VMS 197# include <in.h> 198# else 199# include <netinet/in.h> 200# endif 201#endif 202 203#endif /* Include guard */ 204 205#endif /* PERL_SDBM_FILE_SDBM_H_ */ 206