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ruby/ext/gdbm/gdbm.c

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/************************************************
gdbm.c -
$Author$
modified at: Mon Jan 24 15:59:52 JST 1994
Documentation by Peter Adolphs < futzilogik at users dot sourceforge dot net >
************************************************/
#include "ruby.h"
#include <gdbm.h>
#include <fcntl.h>
#include <errno.h>
/*
* Document-class: GDBM
*
* == Summary
*
* Ruby extension for GNU dbm (gdbm) -- a simple database engine for storing
* key-value pairs on disk.
*
* == Description
*
* GNU dbm is a library for simple databases. A database is a file that stores
* key-value pairs. Gdbm allows the user to store, retrieve, and delete data by
* key. It furthermore allows a non-sorted traversal of all key-value pairs.
* A gdbm database thus provides the same functionality as a hash. As
* with objects of the Hash class, elements can be accessed with <tt>[]</tt>.
* Furthermore, GDBM mixes in the Enumerable module, thus providing convenient
* methods such as #find, #collect, #map, etc.
*
* A process is allowed to open several different databases at the same time.
* A process can open a database as a "reader" or a "writer". Whereas a reader
* has only read-access to the database, a writer has read- and write-access.
* A database can be accessed either by any number of readers or by exactly one
* writer at the same time.
*
* == Examples
*
* 1. Opening/creating a database, and filling it with some entries:
*
* require 'gdbm'
*
* gdbm = GDBM.new("fruitstore.db")
* gdbm["ananas"] = "3"
* gdbm["banana"] = "8"
* gdbm["cranberry"] = "4909"
* gdbm.close
*
* 2. Reading out a database:
*
* require 'gdbm'
*
* gdbm = GDBM.new("fruitstore.db")
* gdbm.each_pair do |key, value|
* print "#{key}: #{value}\n"
* end
* gdbm.close
*
* produces
*
* banana: 8
* ananas: 3
* cranberry: 4909
*
* == Links
*
* * http://www.gnu.org/software/gdbm/
*/
static VALUE rb_cGDBM, rb_eGDBMError, rb_eGDBMFatalError;
#define RUBY_GDBM_RW_BIT 0x20000000
#define MY_BLOCK_SIZE (2048)
#define MY_FATAL_FUNC rb_gdbm_fatal
static void
rb_gdbm_fatal(char *msg)
{
rb_raise(rb_eGDBMFatalError, "%s", msg);
}
struct dbmdata {
int di_size;
GDBM_FILE di_dbm;
};
static void
closed_dbm(void)
{
rb_raise(rb_eRuntimeError, "closed GDBM file");
}
#define GetDBM(obj, dbmp) do {\
Data_Get_Struct(obj, struct dbmdata, dbmp);\
if (dbmp == 0) closed_dbm();\
if (dbmp->di_dbm == 0) closed_dbm();\
} while (0)
#define GetDBM2(obj, data, dbm) {\
GetDBM(obj, data);\
(dbm) = dbmp->di_dbm;\
}
static void
free_dbm(struct dbmdata *dbmp)
{
if (dbmp) {
if (dbmp->di_dbm) gdbm_close(dbmp->di_dbm);
xfree(dbmp);
}
}
/*
* call-seq:
* gdbm.close -> nil
*
* Closes the associated database file.
*/
static VALUE
fgdbm_close(VALUE obj)
{
struct dbmdata *dbmp;
GetDBM(obj, dbmp);
gdbm_close(dbmp->di_dbm);
dbmp->di_dbm = 0;
return Qnil;
}
/*
* call-seq:
* gdbm.closed? -> true or false
*
* Returns true if the associated database file has been closed.
*/
static VALUE
fgdbm_closed(VALUE obj)
{
struct dbmdata *dbmp;
Data_Get_Struct(obj, struct dbmdata, dbmp);
if (dbmp == 0)
return Qtrue;
if (dbmp->di_dbm == 0)
return Qtrue;
return Qfalse;
}
static VALUE
fgdbm_s_alloc(VALUE klass)
{
return Data_Wrap_Struct(klass, 0, free_dbm, 0);
}
/*
* call-seq:
* GDBM.new(filename, mode = 0666, flags = nil)
*
* Creates a new GDBM instance by opening a gdbm file named _filename_.
* If the file does not exist, a new file with file mode _mode_ will be
* created. _flags_ may be one of the following:
* * *READER* - open as a reader
* * *WRITER* - open as a writer
* * *WRCREAT* - open as a writer; if the database does not exist, create a new one
* * *NEWDB* - open as a writer; overwrite any existing databases
*
* The values *WRITER*, *WRCREAT* and *NEWDB* may be combined with the following
* values by bitwise or:
* * *SYNC* - cause all database operations to be synchronized to the disk
* * *NOLOCK* - do not lock the database file
*
* If no _flags_ are specified, the GDBM object will try to open the database
* file as a writer and will create it if it does not already exist
* (cf. flag <tt>WRCREAT</tt>). If this fails (for instance, if another process
* has already opened the database as a reader), it will try to open the
* database file as a reader (cf. flag <tt>READER</tt>).
*/
static VALUE
fgdbm_initialize(int argc, VALUE *argv, VALUE obj)
{
VALUE file, vmode, vflags;
GDBM_FILE dbm;
struct dbmdata *dbmp;
int mode, flags = 0;
if (rb_scan_args(argc, argv, "12", &file, &vmode, &vflags) == 1) {
mode = 0666; /* default value */
}
else if (NIL_P(vmode)) {
mode = -1; /* return nil if DB does not exist */
}
else {
mode = NUM2INT(vmode);
}
if (!NIL_P(vflags))
flags = NUM2INT(vflags);
SafeStringValue(file);
if (flags & RUBY_GDBM_RW_BIT) {
flags &= ~RUBY_GDBM_RW_BIT;
dbm = gdbm_open(RSTRING_PTR(file), MY_BLOCK_SIZE,
flags, mode, MY_FATAL_FUNC);
}
else {
dbm = 0;
if (mode >= 0)
dbm = gdbm_open(RSTRING_PTR(file), MY_BLOCK_SIZE,
GDBM_WRCREAT|flags, mode, MY_FATAL_FUNC);
if (!dbm)
dbm = gdbm_open(RSTRING_PTR(file), MY_BLOCK_SIZE,
GDBM_WRITER|flags, 0, MY_FATAL_FUNC);
if (!dbm)
dbm = gdbm_open(RSTRING_PTR(file), MY_BLOCK_SIZE,
GDBM_READER|flags, 0, MY_FATAL_FUNC);
}
if (!dbm) {
if (mode == -1) return Qnil;
if (gdbm_errno == GDBM_FILE_OPEN_ERROR ||
gdbm_errno == GDBM_CANT_BE_READER ||
gdbm_errno == GDBM_CANT_BE_WRITER)
rb_sys_fail(RSTRING_PTR(file));
else
rb_raise(rb_eGDBMError, "%s", gdbm_strerror(gdbm_errno));
}
dbmp = ALLOC(struct dbmdata);
free_dbm(DATA_PTR(obj));
DATA_PTR(obj) = dbmp;
dbmp->di_dbm = dbm;
dbmp->di_size = -1;
return obj;
}
/*
* call-seq:
* GDBM.open(filename, mode = 0666, flags = nil)
* GDBM.open(filename, mode = 0666, flags = nil) { |gdbm| ... }
*
* If called without a block, this is synonymous to GDBM::new.
* If a block is given, the new GDBM instance will be passed to the block
* as a parameter, and the corresponding database file will be closed
* after the execution of the block code has been finished.
*
* Example for an open call with a block:
*
* require 'gdbm'
* GDBM.open("fruitstore.db") do |gdbm|
* gdbm.each_pair do |key, value|
* print "#{key}: #{value}\n"
* end
* end
*/
static VALUE
fgdbm_s_open(int argc, VALUE *argv, VALUE klass)
{
VALUE obj = Data_Wrap_Struct(klass, 0, free_dbm, 0);
if (NIL_P(fgdbm_initialize(argc, argv, obj))) {
return Qnil;
}
if (rb_block_given_p()) {
return rb_ensure(rb_yield, obj, fgdbm_close, obj);
}
return obj;
}
static VALUE
rb_gdbm_fetch(GDBM_FILE dbm, datum key)
{
datum val;
VALUE str;
val = gdbm_fetch(dbm, key);
if (val.dptr == 0)
return Qnil;
str = rb_str_new(val.dptr, val.dsize);
free(val.dptr);
OBJ_TAINT(str);
return str;
}
static VALUE
rb_gdbm_fetch2(GDBM_FILE dbm, VALUE keystr)
{
datum key;
StringValue(keystr);
key.dptr = RSTRING_PTR(keystr);
key.dsize = RSTRING_LEN(keystr);
return rb_gdbm_fetch(dbm, key);
}
static VALUE
rb_gdbm_fetch3(VALUE obj, VALUE keystr)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
GetDBM2(obj, dbmp, dbm);
return rb_gdbm_fetch2(dbm, keystr);
}
static VALUE
rb_gdbm_firstkey(GDBM_FILE dbm)
{
datum key;
VALUE str;
key = gdbm_firstkey(dbm);
if (key.dptr == 0)
return Qnil;
str = rb_str_new(key.dptr, key.dsize);
free(key.dptr);
OBJ_TAINT(str);
return str;
}
static VALUE
rb_gdbm_nextkey(GDBM_FILE dbm, VALUE keystr)
{
datum key, key2;
VALUE str;
key.dptr = RSTRING_PTR(keystr);
key.dsize = RSTRING_LEN(keystr);
key2 = gdbm_nextkey(dbm, key);
if (key2.dptr == 0)
return Qnil;
str = rb_str_new(key2.dptr, key2.dsize);
free(key2.dptr);
OBJ_TAINT(str);
return str;
}
static VALUE
fgdbm_fetch(VALUE obj, VALUE keystr, VALUE ifnone)
{
VALUE valstr;
valstr = rb_gdbm_fetch3(obj, keystr);
if (NIL_P(valstr)) {
if (ifnone == Qnil && rb_block_given_p())
return rb_yield(keystr);
return ifnone;
}
return valstr;
}
/*
* call-seq:
* gdbm[key] -> value
*
* Retrieves the _value_ corresponding to _key_.
*/
static VALUE
fgdbm_aref(VALUE obj, VALUE keystr)
{
return rb_gdbm_fetch3(obj, keystr);
}
/*
* call-seq:
* gdbm.fetch(key [, default]) -> value
*
* Retrieves the _value_ corresponding to _key_. If there is no value
* associated with _key_, _default_ will be returned instead.
*/
static VALUE
fgdbm_fetch_m(int argc, VALUE *argv, VALUE obj)
{
VALUE keystr, valstr, ifnone;
rb_scan_args(argc, argv, "11", &keystr, &ifnone);
valstr = fgdbm_fetch(obj, keystr, ifnone);
if (argc == 1 && !rb_block_given_p() && NIL_P(valstr))
rb_raise(rb_eIndexError, "key not found");
return valstr;
}
/*
* call-seq:
* gdbm.key(value) -> key
*
* Returns the _key_ for a given _value_. If several keys may map to the
* same value, the key that is found first will be returned.
*/
static VALUE
fgdbm_key(VALUE obj, VALUE valstr)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr, valstr2;
StringValue(valstr);
GetDBM2(obj, dbmp, dbm);
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
valstr2 = rb_gdbm_fetch2(dbm, keystr);
if (!NIL_P(valstr2) &&
RSTRING_LEN(valstr) == RSTRING_LEN(valstr2) &&
memcmp(RSTRING_PTR(valstr), RSTRING_PTR(valstr2),
RSTRING_LEN(valstr)) == 0) {
return keystr;
}
}
return Qnil;
}
/* :nodoc: */
static VALUE
fgdbm_index(VALUE obj, VALUE value)
{
rb_warn("GDBM#index is deprecated; use GDBM#key");
return fgdbm_key(obj, value);
}
/*
* call-seq:
* gdbm.select { |value| block } -> array
*
* Returns a new array of all values of the database for which _block_
* evaluates to true.
*/
static VALUE
fgdbm_select(VALUE obj)
{
VALUE new = rb_ary_new();
GDBM_FILE dbm;
struct dbmdata *dbmp;
VALUE keystr;
GetDBM2(obj, dbmp, dbm);
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
VALUE assoc = rb_assoc_new(keystr, rb_gdbm_fetch2(dbm, keystr));
VALUE v = rb_yield(assoc);
if (RTEST(v)) {
rb_ary_push(new, assoc);
}
GetDBM2(obj, dbmp, dbm);
}
return new;
}
/*
* call-seq:
* gdbm.values_at(key, ...) -> array
*
* Returns an array of the values associated with each specified _key_.
*/
static VALUE
fgdbm_values_at(int argc, VALUE *argv, VALUE obj)
{
VALUE new = rb_ary_new2(argc);
int i;
for (i=0; i<argc; i++) {
rb_ary_push(new, rb_gdbm_fetch3(obj, argv[i]));
}
return new;
}
static void
rb_gdbm_modify(VALUE obj)
{
rb_secure(4);
if (OBJ_FROZEN(obj)) rb_error_frozen("GDBM");
}
static VALUE
rb_gdbm_delete(VALUE obj, VALUE keystr)
{
datum key;
struct dbmdata *dbmp;
GDBM_FILE dbm;
rb_gdbm_modify(obj);
StringValue(keystr);
key.dptr = RSTRING_PTR(keystr);
key.dsize = RSTRING_LEN(keystr);
GetDBM2(obj, dbmp, dbm);
if (!gdbm_exists(dbm, key)) {
return Qnil;
}
if (gdbm_delete(dbm, key)) {
dbmp->di_size = -1;
rb_raise(rb_eGDBMError, "%s", gdbm_strerror(gdbm_errno));
}
else if (dbmp->di_size >= 0) {
dbmp->di_size--;
}
return obj;
}
/*
* call-seq:
* gdbm.delete(key) -> value or nil
*
* Removes the key-value-pair with the specified _key_ from this database and
* returns the corresponding _value_. Returns nil if the database is empty.
*/
static VALUE
fgdbm_delete(VALUE obj, VALUE keystr)
{
VALUE valstr;
valstr = fgdbm_fetch(obj, keystr, Qnil);
rb_gdbm_delete(obj, keystr);
return valstr;
}
/*
* call-seq:
* gdbm.shift -> (key, value) or nil
*
* Removes a key-value-pair from this database and returns it as a
* two-item array [ _key_, _value_ ]. Returns nil if the database is empty.
*/
static VALUE
fgdbm_shift(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr, valstr;
rb_gdbm_modify(obj);
GetDBM2(obj, dbmp, dbm);
keystr = rb_gdbm_firstkey(dbm);
if (NIL_P(keystr)) return Qnil;
valstr = rb_gdbm_fetch2(dbm, keystr);
rb_gdbm_delete(obj, keystr);
return rb_assoc_new(keystr, valstr);
}
/*
* call-seq:
* gdbm.delete_if { |key, value| block } -> gdbm
* gdbm.reject! { |key, value| block } -> gdbm
*
* Deletes every key-value pair from _gdbm_ for which _block_ evaluates to true.
*/
static VALUE
fgdbm_delete_if(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr, valstr;
VALUE ret, ary = rb_ary_new();
int i, status = 0, n;
rb_gdbm_modify(obj);
GetDBM2(obj, dbmp, dbm);
n = dbmp->di_size;
dbmp->di_size = -1;
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
valstr = rb_gdbm_fetch2(dbm, keystr);
ret = rb_protect(rb_yield, rb_assoc_new(keystr, valstr), &status);
if (status != 0) break;
if (RTEST(ret)) rb_ary_push(ary, keystr);
GetDBM2(obj, dbmp, dbm);
}
for (i = 0; i < RARRAY_LEN(ary); i++)
rb_gdbm_delete(obj, RARRAY_PTR(ary)[i]);
if (status) rb_jump_tag(status);
if (n > 0) dbmp->di_size = n - RARRAY_LEN(ary);
return obj;
}
/*
* call-seq:
* gdbm.clear -> gdbm
*
* Removes all the key-value pairs within _gdbm_.
*/
static VALUE
fgdbm_clear(VALUE obj)
{
datum key, nextkey;
struct dbmdata *dbmp;
GDBM_FILE dbm;
rb_gdbm_modify(obj);
GetDBM2(obj, dbmp, dbm);
dbmp->di_size = -1;
#if 0
while (key = gdbm_firstkey(dbm), key.dptr) {
if (gdbm_delete(dbm, key)) {
free(key.dptr);
rb_raise(rb_eGDBMError, "%s", gdbm_strerror(gdbm_errno));
}
free(key.dptr);
}
#else
while (key = gdbm_firstkey(dbm), key.dptr) {
for (; key.dptr; key = nextkey) {
nextkey = gdbm_nextkey(dbm, key);
if (gdbm_delete(dbm, key)) {
free(key.dptr);
if (nextkey.dptr) free(nextkey.dptr);
rb_raise(rb_eGDBMError, "%s", gdbm_strerror(gdbm_errno));
}
free(key.dptr);
}
}
#endif
dbmp->di_size = 0;
return obj;
}
/*
* call-seq:
* gdbm.invert -> hash
*
* Returns a hash created by using _gdbm_'s values as keys, and the keys
* as values.
*/
static VALUE
fgdbm_invert(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr, valstr;
VALUE hash = rb_hash_new();
GetDBM2(obj, dbmp, dbm);
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
valstr = rb_gdbm_fetch2(dbm, keystr);
rb_hash_aset(hash, valstr, keystr);
}
return hash;
}
/*
* call-seq:
* gdbm[key]= value -> value
* gdbm.store(key, value) -> value
*
* Associates the value _value_ with the specified _key_.
*/
static VALUE
fgdbm_store(VALUE obj, VALUE keystr, VALUE valstr)
{
datum key, val;
struct dbmdata *dbmp;
GDBM_FILE dbm;
rb_gdbm_modify(obj);
StringValue(keystr);
StringValue(valstr);
key.dptr = RSTRING_PTR(keystr);
key.dsize = RSTRING_LEN(keystr);
val.dptr = RSTRING_PTR(valstr);
val.dsize = RSTRING_LEN(valstr);
GetDBM2(obj, dbmp, dbm);
dbmp->di_size = -1;
if (gdbm_store(dbm, key, val, GDBM_REPLACE)) {
if (errno == EPERM) rb_sys_fail(0);
rb_raise(rb_eGDBMError, "%s", gdbm_strerror(gdbm_errno));
}
return valstr;
}
static VALUE
update_i(VALUE pair, VALUE dbm)
{
Check_Type(pair, T_ARRAY);
if (RARRAY_LEN(pair) < 2) {
rb_raise(rb_eArgError, "pair must be [key, value]");
}
fgdbm_store(dbm, RARRAY_PTR(pair)[0], RARRAY_PTR(pair)[1]);
return Qnil;
}
/*
* call-seq:
* gdbm.update(other) -> gdbm
*
* Adds the key-value pairs of _other_ to _gdbm_, overwriting entries with
* duplicate keys with those from _other_. _other_ must have an each_pair
* method.
*/
static VALUE
fgdbm_update(VALUE obj, VALUE other)
{
rb_block_call(other, rb_intern("each_pair"), 0, 0, update_i, obj);
return obj;
}
/*
* call-seq:
* gdbm.replace(other) -> gdbm
*
* Replaces the content of _gdbm_ with the key-value pairs of _other_.
* _other_ must have an each_pair method.
*/
static VALUE
fgdbm_replace(VALUE obj, VALUE other)
{
fgdbm_clear(obj);
rb_block_call(other, rb_intern("each_pair"), 0, 0, update_i, obj);
return obj;
}
/*
* call-seq:
* gdbm.length -> fixnum
* gdbm.size -> fixnum
*
* Returns the number of key-value pairs in this database.
*/
static VALUE
fgdbm_length(VALUE obj)
{
datum key, nextkey;
struct dbmdata *dbmp;
GDBM_FILE dbm;
int i = 0;
GetDBM2(obj, dbmp, dbm);
if (dbmp->di_size > 0) return INT2FIX(dbmp->di_size);
for (key = gdbm_firstkey(dbm); key.dptr; key = nextkey) {
nextkey = gdbm_nextkey(dbm, key);
free(key.dptr);
i++;
}
dbmp->di_size = i;
return INT2FIX(i);
}
/*
* call-seq:
* gdbm.empty? -> true or false
*
* Returns true if the database is empty.
*/
static VALUE
fgdbm_empty_p(VALUE obj)
{
datum key;
struct dbmdata *dbmp;
GDBM_FILE dbm;
GetDBM(obj, dbmp);
if (dbmp->di_size < 0) {
dbm = dbmp->di_dbm;
key = gdbm_firstkey(dbm);
if (key.dptr) {
free(key.dptr);
return Qfalse;
}
return Qtrue;
}
if (dbmp->di_size == 0) return Qtrue;
return Qfalse;
}
/*
* call-seq:
* gdbm.each_value { |value| block } -> gdbm
*
* Executes _block_ for each key in the database, passing the corresponding
* _value_ as a parameter.
*/
static VALUE
fgdbm_each_value(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr;
RETURN_ENUMERATOR(obj, 0, 0);
GetDBM2(obj, dbmp, dbm);
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
rb_yield(rb_gdbm_fetch2(dbm, keystr));
GetDBM2(obj, dbmp, dbm);
}
return obj;
}
/*
* call-seq:
* gdbm.each_key { |key| block } -> gdbm
*
* Executes _block_ for each key in the database, passing the
* _key_ as a parameter.
*/
static VALUE
fgdbm_each_key(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr;
RETURN_ENUMERATOR(obj, 0, 0);
GetDBM2(obj, dbmp, dbm);
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
rb_yield(keystr);
GetDBM2(obj, dbmp, dbm);
}
return obj;
}
/*
* call-seq:
* gdbm.each_pair { |key, value| block } -> gdbm
*
* Executes _block_ for each key in the database, passing the _key_ and the
* correspoding _value_ as a parameter.
*/
static VALUE
fgdbm_each_pair(VALUE obj)
{
GDBM_FILE dbm;
struct dbmdata *dbmp;
VALUE keystr;
RETURN_ENUMERATOR(obj, 0, 0);
GetDBM2(obj, dbmp, dbm);
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
rb_yield(rb_assoc_new(keystr, rb_gdbm_fetch2(dbm, keystr)));
GetDBM2(obj, dbmp, dbm);
}
return obj;
}
/*
* call-seq:
* gdbm.keys -> array
*
* Returns an array of all keys of this database.
*/
static VALUE
fgdbm_keys(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr, ary;
GetDBM2(obj, dbmp, dbm);
ary = rb_ary_new();
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
rb_ary_push(ary, keystr);
}
return ary;
}
/*
* call-seq:
* gdbm.values -> array
*
* Returns an array of all values of this database.
*/
static VALUE
fgdbm_values(VALUE obj)
{
datum key, nextkey;
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE valstr, ary;
GetDBM2(obj, dbmp, dbm);
ary = rb_ary_new();
for (key = gdbm_firstkey(dbm); key.dptr; key = nextkey) {
nextkey = gdbm_nextkey(dbm, key);
valstr = rb_gdbm_fetch(dbm, key);
free(key.dptr);
rb_ary_push(ary, valstr);
}
return ary;
}
/*
* call-seq:
* gdbm.has_key?(k) -> true or false
* gdbm.key?(k) -> true or false
*
* Returns true if the given key _k_ exists within the database.
* Returns false otherwise.
*/
static VALUE
fgdbm_has_key(VALUE obj, VALUE keystr)
{
datum key;
struct dbmdata *dbmp;
GDBM_FILE dbm;
StringValue(keystr);
key.dptr = RSTRING_PTR(keystr);
key.dsize = RSTRING_LEN(keystr);
GetDBM2(obj, dbmp, dbm);
if (gdbm_exists(dbm, key))
return Qtrue;
return Qfalse;
}
/*
* call-seq:
* gdbm.has_value?(v) -> true or false
* gdbm.value?(v) -> true or false
*
* Returns true if the given value _v_ exists within the database.
* Returns false otherwise.
*/
static VALUE
fgdbm_has_value(VALUE obj, VALUE valstr)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr, valstr2;
StringValue(valstr);
GetDBM2(obj, dbmp, dbm);
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
valstr2 = rb_gdbm_fetch2(dbm, keystr);
if (!NIL_P(valstr2) &&
RSTRING_LEN(valstr) == RSTRING_LEN(valstr2) &&
memcmp(RSTRING_PTR(valstr), RSTRING_PTR(valstr2),
RSTRING_LEN(valstr)) == 0) {
return Qtrue;
}
}
return Qfalse;
}
/*
* call-seq:
* gdbm.to_a -> array
*
* Returns an array of all key-value pairs contained in the database.
*/
static VALUE
fgdbm_to_a(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr, ary;
GetDBM2(obj, dbmp, dbm);
ary = rb_ary_new();
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
rb_ary_push(ary, rb_assoc_new(keystr, rb_gdbm_fetch2(dbm, keystr)));
}
return ary;
}
/*
* call-seq:
* gdbm.reorganize -> gdbm
*
* Reorganizes the database file. This operation removes reserved space of
* elements that have already been deleted. It is only useful after a lot of
* deletions in the database.
*/
static VALUE
fgdbm_reorganize(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
rb_gdbm_modify(obj);
GetDBM2(obj, dbmp, dbm);
gdbm_reorganize(dbm);
return obj;
}
/*
* call-seq:
* gdbm.sync -> gdbm
*
* Unless the _gdbm_ object has been opened with the *SYNC* flag, it is not
* guarenteed that database modification operations are immediately applied to
* the database file. This method ensures that all recent modifications
* to the database are written to the file. Blocks until all writing operations
* to the disk have been finished.
*/
static VALUE
fgdbm_sync(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
rb_gdbm_modify(obj);
GetDBM2(obj, dbmp, dbm);
gdbm_sync(dbm);
return obj;
}
/*
* call-seq:
* gdbm.cachesize = size -> size
*
* Sets the size of the internal bucket cache to _size_.
*/
static VALUE
fgdbm_set_cachesize(VALUE obj, VALUE val)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
int optval;
GetDBM2(obj, dbmp, dbm);
optval = FIX2INT(val);
if (gdbm_setopt(dbm, GDBM_CACHESIZE, &optval, sizeof(optval)) == -1) {
rb_raise(rb_eGDBMError, "%s", gdbm_strerror(gdbm_errno));
}
return val;
}
/*
* call-seq:
* gdbm.fastmode = boolean -> boolean
*
* Turns the database's fast mode on or off. If fast mode is turned on, gdbm
* does not wait for writes to be flushed to the disk before continuing.
*
* This option is obsolete for gdbm >= 1.8 since fast mode is turned on by
* default. See also: #syncmode=
*/
static VALUE
fgdbm_set_fastmode(VALUE obj, VALUE val)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
int optval;
GetDBM2(obj, dbmp, dbm);
optval = 0;
if (RTEST(val))
optval = 1;
if (gdbm_setopt(dbm, GDBM_FASTMODE, &optval, sizeof(optval)) == -1) {
rb_raise(rb_eGDBMError, "%s", gdbm_strerror(gdbm_errno));
}
return val;
}
/*
* call-seq:
* gdbm.syncmode = boolean -> boolean
*
* Turns the database's synchronization mode on or off. If the synchronization
* mode is turned on, the database's in-memory state will be synchronized to
* disk after every database modification operation. If the synchronization
* mode is turned off, GDBM does not wait for writes to be flushed to the disk
* before continuing.
*
* This option is only available for gdbm >= 1.8 where syncmode is turned off
* by default. See also: #fastmode=
*/
static VALUE
fgdbm_set_syncmode(VALUE obj, VALUE val)
{
#if !defined(GDBM_SYNCMODE)
fgdbm_set_fastmode(obj, RTEST(val) ? Qfalse : Qtrue);
return val;
#else
struct dbmdata *dbmp;
GDBM_FILE dbm;
int optval;
GetDBM2(obj, dbmp, dbm);
optval = 0;
if (RTEST(val))
optval = 1;
if (gdbm_setopt(dbm, GDBM_FASTMODE, &optval, sizeof(optval)) == -1) {
rb_raise(rb_eGDBMError, "%s", gdbm_strerror(gdbm_errno));
}
return val;
#endif
}
/*
* call-seq:
* gdbm.to_hash -> hash
*
* Returns a hash of all key-value pairs contained in the database.
*/
static VALUE
fgdbm_to_hash(VALUE obj)
{
struct dbmdata *dbmp;
GDBM_FILE dbm;
VALUE keystr, hash;
GetDBM2(obj, dbmp, dbm);
hash = rb_hash_new();
for (keystr = rb_gdbm_firstkey(dbm); RTEST(keystr);
keystr = rb_gdbm_nextkey(dbm, keystr)) {
rb_hash_aset(hash, keystr, rb_gdbm_fetch2(dbm, keystr));
}
return hash;
}
/*
* call-seq:
* gdbm.reject { |key, value| block } -> hash
*
* Returns a hash copy of _gdbm_ where all key-value pairs from _gdbm_ for
* which _block_ evaluates to true are removed. See also: #delete_if
*/
static VALUE
fgdbm_reject(VALUE obj)
{
return rb_hash_delete_if(fgdbm_to_hash(obj));
}
void
Init_gdbm(void)
{
rb_cGDBM = rb_define_class("GDBM", rb_cObject);
rb_eGDBMError = rb_define_class("GDBMError", rb_eStandardError);
rb_eGDBMFatalError = rb_define_class("GDBMFatalError", rb_eException);
rb_include_module(rb_cGDBM, rb_mEnumerable);
rb_define_alloc_func(rb_cGDBM, fgdbm_s_alloc);
rb_define_singleton_method(rb_cGDBM, "open", fgdbm_s_open, -1);
rb_define_method(rb_cGDBM, "initialize", fgdbm_initialize, -1);
rb_define_method(rb_cGDBM, "close", fgdbm_close, 0);
rb_define_method(rb_cGDBM, "closed?", fgdbm_closed, 0);
rb_define_method(rb_cGDBM, "[]", fgdbm_aref, 1);
rb_define_method(rb_cGDBM, "fetch", fgdbm_fetch_m, -1);
rb_define_method(rb_cGDBM, "[]=", fgdbm_store, 2);
rb_define_method(rb_cGDBM, "store", fgdbm_store, 2);
rb_define_method(rb_cGDBM, "index", fgdbm_index, 1);
rb_define_method(rb_cGDBM, "key", fgdbm_key, 1);
rb_define_method(rb_cGDBM, "select", fgdbm_select, 0);
rb_define_method(rb_cGDBM, "values_at", fgdbm_values_at, -1);
rb_define_method(rb_cGDBM, "length", fgdbm_length, 0);
rb_define_method(rb_cGDBM, "size", fgdbm_length, 0);
rb_define_method(rb_cGDBM, "empty?", fgdbm_empty_p, 0);
rb_define_method(rb_cGDBM, "each", fgdbm_each_pair, 0);
rb_define_method(rb_cGDBM, "each_value", fgdbm_each_value, 0);
rb_define_method(rb_cGDBM, "each_key", fgdbm_each_key, 0);
rb_define_method(rb_cGDBM, "each_pair", fgdbm_each_pair, 0);
rb_define_method(rb_cGDBM, "keys", fgdbm_keys, 0);
rb_define_method(rb_cGDBM, "values", fgdbm_values, 0);
rb_define_method(rb_cGDBM, "shift", fgdbm_shift, 0);
rb_define_method(rb_cGDBM, "delete", fgdbm_delete, 1);
rb_define_method(rb_cGDBM, "delete_if", fgdbm_delete_if, 0);
rb_define_method(rb_cGDBM, "reject!", fgdbm_delete_if, 0);
rb_define_method(rb_cGDBM, "reject", fgdbm_reject, 0);
rb_define_method(rb_cGDBM, "clear", fgdbm_clear, 0);
rb_define_method(rb_cGDBM, "invert", fgdbm_invert, 0);
rb_define_method(rb_cGDBM, "update", fgdbm_update, 1);
rb_define_method(rb_cGDBM, "replace", fgdbm_replace, 1);
rb_define_method(rb_cGDBM, "reorganize", fgdbm_reorganize, 0);
rb_define_method(rb_cGDBM, "sync", fgdbm_sync, 0);
/* rb_define_method(rb_cGDBM, "setopt", fgdbm_setopt, 2); */
rb_define_method(rb_cGDBM, "cachesize=", fgdbm_set_cachesize, 1);
rb_define_method(rb_cGDBM, "fastmode=", fgdbm_set_fastmode, 1);
rb_define_method(rb_cGDBM, "syncmode=", fgdbm_set_syncmode, 1);
rb_define_method(rb_cGDBM, "include?", fgdbm_has_key, 1);
rb_define_method(rb_cGDBM, "has_key?", fgdbm_has_key, 1);
rb_define_method(rb_cGDBM, "member?", fgdbm_has_key, 1);
rb_define_method(rb_cGDBM, "has_value?", fgdbm_has_value, 1);
rb_define_method(rb_cGDBM, "key?", fgdbm_has_key, 1);
rb_define_method(rb_cGDBM, "value?", fgdbm_has_value, 1);
rb_define_method(rb_cGDBM, "to_a", fgdbm_to_a, 0);
rb_define_method(rb_cGDBM, "to_hash", fgdbm_to_hash, 0);
/* flag for #new and #open: open database as a reader */
rb_define_const(rb_cGDBM, "READER", INT2FIX(GDBM_READER|RUBY_GDBM_RW_BIT));
/* flag for #new and #open: open database as a writer */
rb_define_const(rb_cGDBM, "WRITER", INT2FIX(GDBM_WRITER|RUBY_GDBM_RW_BIT));
/* flag for #new and #open: open database as a writer; if the database does not exist, create a new one */
rb_define_const(rb_cGDBM, "WRCREAT", INT2FIX(GDBM_WRCREAT|RUBY_GDBM_RW_BIT));
/* flag for #new and #open: open database as a writer; overwrite any existing databases */
rb_define_const(rb_cGDBM, "NEWDB", INT2FIX(GDBM_NEWDB|RUBY_GDBM_RW_BIT));
/* flag for #new and #open. this flag is obsolete for gdbm >= 1.8 */
rb_define_const(rb_cGDBM, "FAST", INT2FIX(GDBM_FAST));
/* this flag is obsolete in gdbm 1.8.
On gdbm 1.8, fast mode is default behavior. */
/* gdbm version 1.8 specific */
#if defined(GDBM_SYNC)
/* flag for #new and #open. only for gdbm >= 1.8 */
rb_define_const(rb_cGDBM, "SYNC", INT2FIX(GDBM_SYNC));
#endif
#if defined(GDBM_NOLOCK)
/* flag for #new and #open */
rb_define_const(rb_cGDBM, "NOLOCK", INT2FIX(GDBM_NOLOCK));
#endif
/* version of the gdbm library*/
rb_define_const(rb_cGDBM, "VERSION", rb_str_new2(gdbm_version));
}
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