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ruby--ruby/ext/dbm/dbm.c
matz 3db12e8b23 Initial revision 
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
1998-01-16 12:13:05 +00:00

515 lines
10 KiB
C
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/************************************************
dbm.c -
$Author$
$Date$
created at: Mon Jan 24 15:59:52 JST 1994
Copyright (C) 1995 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#include <ndbm.h>
#include <fcntl.h>
#include <errno.h>
VALUE cDBM;
extern VALUE mEnumerable;
struct dbmdata {
int di_size;
DBM *di_dbm;
};
static void
closed_dbm()
{
Fail("closed DBM file");
}
#define GetDBM(obj, dbmp) {\
Data_Get_Struct(obj, struct dbmdata, dbmp);\
if (dbmp->di_dbm == 0) closed_dbm();\
}
static void
free_dbm(dbmp)
struct dbmdata *dbmp;
{
if (dbmp->di_dbm) dbm_close(dbmp->di_dbm);
}
static VALUE
fdbm_s_open(argc, argv, class)
int argc;
VALUE *argv;
VALUE class;
{
VALUE file, vmode;
DBM *dbm;
struct dbmdata *dbmp;
int mode;
VALUE obj;
if (rb_scan_args(argc, argv, "11", &file, &vmode) == 1) {
mode = 0666; /* default value */
}
else if (NIL_P(vmode)) {
mode = -1; /* return nil if DB not exist */
}
else {
mode = NUM2INT(vmode);
}
Check_SafeStr(file);
dbm = 0;
if (mode >= 0)
dbm = dbm_open(RSTRING(file)->ptr, O_RDWR|O_CREAT, mode);
if (!dbm)
dbm = dbm_open(RSTRING(file)->ptr, O_RDWR, mode);
if (!dbm)
dbm = dbm_open(RSTRING(file)->ptr, O_RDONLY, mode);
if (!dbm) {
if (mode == -1) return Qnil;
rb_sys_fail(RSTRING(file)->ptr);
}
obj = Data_Make_Struct(class,struct dbmdata,0,free_dbm,dbmp);
dbmp->di_dbm = dbm;
dbmp->di_size = -1;
return obj;
}
static VALUE
fdbm_close(obj)
VALUE obj;
{
struct dbmdata *dbmp;
Data_Get_Struct(obj, struct dbmdata, dbmp);
if (dbmp->di_dbm == 0) closed_dbm();
dbm_close(dbmp->di_dbm);
dbmp->di_dbm = 0;
return Qnil;
}
static VALUE
fdbm_fetch(obj, keystr)
VALUE obj, keystr;
{
datum key, value;
struct dbmdata *dbmp;
DBM *dbm;
Check_Type(keystr, T_STRING);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
value = dbm_fetch(dbm, key);
if (value.dptr == 0) {
return Qnil;
}
return str_taint(str_new(value.dptr, value.dsize));
}
static VALUE
fdbm_indexes(obj, args)
VALUE obj;
struct RArray *args;
{
VALUE *p, *pend;
VALUE new;
int i = 0;
args = (struct RArray*)rb_to_a(args);
new = ary_new2(args->len);
p = args->ptr; pend = p + args->len;
while (p < pend) {
ary_push(new, fdbm_fetch(obj, *p++));
}
return new;
}
static VALUE
fdbm_delete(obj, keystr)
VALUE obj, keystr;
{
datum key, value;
struct dbmdata *dbmp;
DBM *dbm;
rb_secure(4);
Check_Type(keystr, T_STRING);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
value = dbm_fetch(dbm, key);
if (value.dptr == 0) {
if (iterator_p()) rb_yield(keystr);
return Qnil;
}
if (dbm_delete(dbm, key)) {
dbmp->di_size = -1;
Fail("dbm_delete failed");
}
else if (dbmp->di_size >= 0) {
dbmp->di_size--;
}
return obj;
}
static VALUE
fdbm_shift(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE keystr, valstr;
rb_secure(4);
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
key = dbm_firstkey(dbm);
if (!key.dptr) return Qnil;
val = dbm_fetch(dbm, key);
dbm_delete(dbm, key);
keystr = str_taint(str_new(key.dptr, key.dsize));
valstr = str_taint(str_new(val.dptr, val.dsize));
return assoc_new(keystr, valstr);
}
static VALUE
fdbm_delete_if(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE keystr, valstr;
rb_secure(4);
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
keystr = str_taint(str_new(key.dptr, key.dsize));
valstr = str_taint(str_new(val.dptr, val.dsize));
if (RTEST(rb_yield(assoc_new(keystr, valstr)))) {
if (dbm_delete(dbm, key)) {
Fail("dbm_delete failed");
}
}
}
return obj;
}
static VALUE
fdbm_clear(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
rb_secure(4);
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
dbmp->di_size = -1;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
if (dbm_delete(dbm, key)) {
Fail("dbm_delete failed");
}
}
return obj;
}
static VALUE
fdbm_store(obj, keystr, valstr)
VALUE obj, keystr, valstr;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
if (valstr == Qnil) {
fdbm_delete(obj, keystr);
return Qnil;
}
rb_secure(4);
keystr = obj_as_string(keystr);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
if (NIL_P(valstr)) return fdbm_delete(obj, keystr);
valstr = obj_as_string(valstr);
val.dptr = RSTRING(valstr)->ptr;
val.dsize = RSTRING(valstr)->len;
Data_Get_Struct(obj, struct dbmdata, dbmp);
dbmp->di_size = -1;
dbm = dbmp->di_dbm;
if (dbm_store(dbm, key, val, DBM_REPLACE)) {
dbm_clearerr(dbm);
if (errno == EPERM) rb_sys_fail(Qnil);
Fail("dbm_store failed");
}
return valstr;
}
static VALUE
fdbm_length(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
int i = 0;
Data_Get_Struct(obj, struct dbmdata, dbmp);
if (dbmp->di_size > 0) return INT2FIX(dbmp->di_size);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
i++;
}
dbmp->di_size = i;
return INT2FIX(i);
}
static VALUE
fdbm_empty_p(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
int i = 0;
Data_Get_Struct(obj, struct dbmdata, dbmp);
if (dbmp->di_size < 0) {
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
i++;
}
}
else {
i = dbmp->di_size;
}
if (i == 0) return TRUE;
return FALSE;
}
static VALUE
fdbm_each_value(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
rb_yield(str_taint(str_new(val.dptr, val.dsize)));
}
return obj;
}
static VALUE
fdbm_each_key(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
rb_yield(str_taint(str_new(key.dptr, key.dsize)));
}
return obj;
}
static VALUE
fdbm_each_pair(obj)
VALUE obj;
{
datum key, val;
DBM *dbm;
struct dbmdata *dbmp;
VALUE keystr, valstr;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
keystr = str_taint(str_new(key.dptr, key.dsize));
valstr = str_taint(str_new(val.dptr, val.dsize));
rb_yield(assoc_new(keystr, valstr));
}
return obj;
}
static VALUE
fdbm_keys(obj)
VALUE obj;
{
datum key;
struct dbmdata *dbmp;
DBM *dbm;
VALUE ary;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
ary = ary_new();
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
ary_push(ary, str_taint(str_new(key.dptr, key.dsize)));
}
return ary;
}
static VALUE
fdbm_values(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE ary;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
ary = ary_new();
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
ary_push(ary, str_taint(str_new(val.dptr, val.dsize)));
}
return ary;
}
static VALUE
fdbm_has_key(obj, keystr)
VALUE obj, keystr;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
Check_Type(keystr, T_STRING);
key.dptr = RSTRING(keystr)->ptr;
key.dsize = RSTRING(keystr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
val = dbm_fetch(dbm, key);
if (val.dptr) return TRUE;
return FALSE;
}
static VALUE
fdbm_has_value(obj, valstr)
VALUE obj, valstr;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
Check_Type(valstr, T_STRING);
val.dptr = RSTRING(valstr)->ptr;
val.dsize = RSTRING(valstr)->len;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
if (val.dsize == RSTRING(valstr)->len &&
memcmp(val.dptr, RSTRING(valstr)->ptr, val.dsize) == 0)
return TRUE;
}
return FALSE;
}
static VALUE
fdbm_to_a(obj)
VALUE obj;
{
datum key, val;
struct dbmdata *dbmp;
DBM *dbm;
VALUE ary;
GetDBM(obj, dbmp);
dbm = dbmp->di_dbm;
ary = ary_new();
for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
val = dbm_fetch(dbm, key);
ary_push(ary, assoc_new(str_taint(str_new(key.dptr, key.dsize)),
str_taint(str_new(val.dptr, val.dsize))));
}
return ary;
}
Init_dbm()
{
cDBM = rb_define_class("DBM", cObject);
rb_include_module(cDBM, mEnumerable);
rb_define_singleton_method(cDBM, "open", fdbm_s_open, -1);
rb_define_method(cDBM, "close", fdbm_close, 0);
rb_define_method(cDBM, "[]", fdbm_fetch, 1);
rb_define_method(cDBM, "[]=", fdbm_store, 2);
rb_define_method(cDBM, "indexes", fdbm_indexes, -2);
rb_define_method(cDBM, "length", fdbm_length, 0);
rb_define_alias(cDBM, "size", "length");
rb_define_method(cDBM, "empty?", fdbm_empty_p, 0);
rb_define_method(cDBM, "each", fdbm_each_pair, 0);
rb_define_method(cDBM, "each_value", fdbm_each_value, 0);
rb_define_method(cDBM, "each_key", fdbm_each_key, 0);
rb_define_method(cDBM, "each_pair", fdbm_each_pair, 0);
rb_define_method(cDBM, "keys", fdbm_keys, 0);
rb_define_method(cDBM, "values", fdbm_values, 0);
rb_define_method(cDBM, "shift", fdbm_shift, 1);
rb_define_method(cDBM, "delete", fdbm_delete, 1);
rb_define_method(cDBM, "delete_if", fdbm_delete_if, 0);
rb_define_method(cDBM, "clear", fdbm_clear, 0);
rb_define_method(cDBM, "include?", fdbm_has_key, 1);
rb_define_method(cDBM, "has_key?", fdbm_has_key, 1);
rb_define_method(cDBM, "has_value?", fdbm_has_value, 1);
rb_define_method(cDBM, "key?", fdbm_has_key, 1);
rb_define_method(cDBM, "value?", fdbm_has_value, 1);
rb_define_method(cDBM, "to_a", fdbm_to_a, 0);
}
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