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-rw-r--r--ext/dbm.c441
1 files changed, 441 insertions, 0 deletions
diff --git a/ext/dbm.c b/ext/dbm.c
new file mode 100644
index 0000000..f3e8295
--- /dev/null
+++ b/ext/dbm.c
@@ -0,0 +1,441 @@
+/************************************************
+
+ dbm.c -
+
+ $Author: matz $
+ $Date: 1995/01/10 10:42:24 $
+ created at: Mon Jan 24 15:59:52 JST 1994
+
+ Copyright (C) 1995 Yukihiro Matsumoto
+
+************************************************/
+
+#include "ruby.h"
+
+#ifdef USE_DBM
+
+#include <ndbm.h>
+#include <fcntl.h>
+#include <errno.h>
+
+VALUE C_DBM;
+static ID id_dbm;
+
+extern VALUE M_Enumerable;
+
+static void
+closeddbm()
+{
+ Fail("closed DBM file");
+}
+
+#define GetDBM(obj, dbmp) {\
+ DBM **_dbm;\
+ Get_Data_Struct(obj, id_dbm, DBM*, _dbm);\
+ dbmp = *_dbm;\
+ if (dbmp == Qnil) closeddbm();\
+}
+
+static void
+free_dbm(dbmp)
+ DBM **dbmp;
+{
+ if (*dbmp) dbm_close(*dbmp);
+}
+
+#define MakeDBM(obj, dp) {\
+ DBM **_dbm;\
+ if (!id_dbm) id_dbm = rb_intern("dbm");\
+ Make_Data_Struct(obj,id_dbm,DBM*,Qnil,free_dbm,_dbm);\
+ *_dbm=dp;\
+}
+
+static VALUE
+Sdbm_open(argc, argv, class)
+ int argc;
+ VALUE *argv;
+ VALUE class;
+{
+ VALUE file, vmode;
+ DBM *dbm, **dbm2;
+ 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_Type(file, T_STRING);
+
+ dbm = Qnil;
+ 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 = obj_alloc(class);
+ MakeDBM(obj, dbm);
+
+ return obj;
+}
+
+static VALUE
+Fdbm_close(obj)
+ VALUE obj;
+{
+ DBM **dbmp;
+
+ Get_Data_Struct(obj, id_dbm, DBM*, dbmp);
+ if (*dbmp == Qnil) Fail("already closed DBM file");
+ dbm_close(*dbmp);
+ *dbmp = Qnil;
+
+ return Qnil;
+}
+
+static VALUE
+Fdbm_fetch(obj, keystr)
+ VALUE obj, keystr;
+{
+ datum key, value;
+ DBM *dbm;
+
+ Check_Type(keystr, T_STRING);
+ key.dptr = RSTRING(keystr)->ptr;
+ key.dsize = RSTRING(keystr)->len;
+
+ GetDBM(obj, dbm);
+ value = dbm_fetch(dbm, key);
+ if (value.dptr == Qnil) {
+ return Qnil;
+ }
+ return str_new(value.dptr, value.dsize);
+}
+
+static VALUE
+Fdbm_indexes(obj, args)
+ VALUE obj;
+ struct RArray *args;
+{
+ VALUE *p, *pend;
+ struct RArray *new;
+ int i = 0;
+
+ if (!args || args->len == 1 && TYPE(args->ptr) != T_ARRAY) {
+ args = (struct RArray*)rb_to_a(args->ptr[0]);
+ }
+
+ new = (struct RArray*)ary_new2(args->len);
+
+ p = args->ptr; pend = p + args->len;
+ while (p < pend) {
+ new->ptr[i++] = Fdbm_fetch(obj, *p++);
+ new->len = i;
+ }
+ return (VALUE)new;
+}
+
+static VALUE
+Fdbm_delete(obj, keystr)
+ VALUE obj, keystr;
+{
+ datum key;
+ DBM *dbm;
+
+ Check_Type(keystr, T_STRING);
+ key.dptr = RSTRING(keystr)->ptr;
+ key.dsize = RSTRING(keystr)->len;
+
+ GetDBM(obj, dbm);
+ if (dbm_delete(dbm, key)) {
+ Fail("dbm_delete failed");
+ }
+ return obj;
+}
+
+static VALUE
+Fdbm_shift(obj)
+ VALUE obj;
+{
+ datum key, val;
+ DBM *dbm;
+ VALUE keystr, valstr;
+
+ GetDBM(obj, dbm);
+
+ key = dbm_firstkey(dbm);
+ if (!key.dptr) return Qnil;
+ val = dbm_fetch(dbm, key);
+ dbm_delete(dbm, key);
+
+ keystr = str_new(key.dptr, key.dsize);
+ valstr = str_new(val.dptr, val.dsize);
+ return assoc_new(keystr, valstr);
+}
+
+static VALUE
+Fdbm_delete_if(obj)
+ VALUE obj;
+{
+ datum key, val;
+ DBM *dbm;
+ VALUE keystr, valstr;
+
+ GetDBM(obj, dbm);
+ for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
+ val = dbm_fetch(dbm, key);
+ keystr = str_new(key.dptr, key.dsize);
+ valstr = str_new(val.dptr, val.dsize);
+ if (rb_yield(assoc_new(keystr, valstr))
+ && dbm_delete(dbm, key)) {
+ Fail("dbm_delete failed");
+ }
+ }
+ return obj;
+}
+
+static VALUE
+Fdbm_clear(obj)
+ VALUE obj;
+{
+ datum key;
+ DBM *dbm;
+
+ GetDBM(obj, dbm);
+ 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;
+ DBM *dbm;
+
+ if (valstr == Qnil) {
+ Fdbm_delete(obj, keystr);
+ return Qnil;
+ }
+
+ Check_Type(keystr, T_STRING);
+ key.dptr = RSTRING(keystr)->ptr;
+ key.dsize = RSTRING(keystr)->len;
+ Check_Type(valstr, T_STRING);
+ val.dptr = RSTRING(valstr)->ptr;
+ val.dsize = RSTRING(valstr)->len;
+
+ GetDBM(obj, 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;
+ DBM *dbm;
+ int i = 0;
+
+ GetDBM(obj, dbm);
+ for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
+ i++;
+ }
+ return INT2FIX(i);
+}
+
+static VALUE
+Fdbm_each_value(obj)
+ VALUE obj;
+{
+ datum key, val;
+ DBM *dbm;
+
+ GetDBM(obj, dbm);
+ for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
+ val = dbm_fetch(dbm, key);
+ rb_yield(str_new(val.dptr, val.dsize));
+ }
+ return obj;
+}
+
+static VALUE
+Fdbm_each_key(obj)
+ VALUE obj;
+{
+ datum key;
+ DBM *dbm;
+
+ GetDBM(obj, dbm);
+ for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
+ rb_yield(str_new(key.dptr, key.dsize));
+ }
+ return obj;
+}
+
+static VALUE
+Fdbm_each_pair(obj)
+ VALUE obj;
+{
+ datum key, val;
+ DBM *dbm;
+ VALUE keystr, valstr;
+
+ GetDBM(obj, dbm);
+
+ for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
+ val = dbm_fetch(dbm, key);
+ keystr = str_new(key.dptr, key.dsize);
+ valstr = str_new(val.dptr, val.dsize);
+ rb_yield(assoc_new(keystr, valstr));
+ }
+
+ return obj;
+}
+
+static VALUE
+Fdbm_keys(obj)
+ VALUE obj;
+{
+ datum key;
+ DBM *dbm;
+ VALUE ary;
+
+ ary = ary_new();
+ GetDBM(obj, dbm);
+ for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
+ ary_push(ary, str_new(key.dptr, key.dsize));
+ }
+
+ return ary;
+}
+
+static VALUE
+Fdbm_values(obj)
+ VALUE obj;
+{
+ datum key, val;
+ DBM *dbm;
+ VALUE ary;
+
+ ary = ary_new();
+ GetDBM(obj, dbm);
+ for (key = dbm_firstkey(dbm); key.dptr; key = dbm_nextkey(dbm)) {
+ val = dbm_fetch(dbm, key);
+ ary_push(ary, str_new(val.dptr, val.dsize));
+ }
+
+ return ary;
+}
+
+static VALUE
+Fdbm_has_key(obj, keystr)
+ VALUE obj, keystr;
+{
+ datum key, val;
+ DBM *dbm;
+
+ Check_Type(keystr, T_STRING);
+ key.dptr = RSTRING(keystr)->ptr;
+ key.dsize = RSTRING(keystr)->len;
+
+ GetDBM(obj, 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;
+ DBM *dbm;
+
+ Check_Type(valstr, T_STRING);
+ val.dptr = RSTRING(valstr)->ptr;
+ val.dsize = RSTRING(valstr)->len;
+
+ GetDBM(obj, 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;
+ DBM *dbm;
+ VALUE ary;
+
+ GetDBM(obj, 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_new(key.dptr, key.dsize),
+ str_new(val.dptr, val.dsize)));
+ }
+
+ return ary;
+}
+
+Init_dbm()
+{
+#ifdef HAVE_LIBDBM
+ dln_load_lib("libdbm.a");
+#endif
+ C_DBM = rb_define_class("DBM", C_Object);
+ rb_include_module(C_DBM, M_Enumerable);
+
+ rb_define_single_method(C_DBM, "open", Sdbm_open, -1);
+ rb_define_method(C_DBM, "close", Fdbm_close, 0);
+ rb_define_method(C_DBM, "[]", Fdbm_fetch, 1);
+ rb_define_method(C_DBM, "[]=", Fdbm_store, 2);
+ rb_define_method(C_DBM, "indexes", Fdbm_indexes, -2);
+ rb_define_method(C_DBM, "length", Fdbm_length, 0);
+ rb_define_alias(C_DBM, "size", "length");
+ rb_define_method(C_DBM, "each", Fdbm_each_pair, 0);
+ rb_define_method(C_DBM, "each_value", Fdbm_each_value, 0);
+ rb_define_method(C_DBM, "each_key", Fdbm_each_key, 0);
+ rb_define_method(C_DBM, "each_pair", Fdbm_each_pair, 0);
+ rb_define_method(C_DBM, "keys", Fdbm_keys, 0);
+ rb_define_method(C_DBM, "values", Fdbm_values, 0);
+ rb_define_method(C_DBM, "shift", Fdbm_shift, 1);
+ rb_define_method(C_DBM, "delete", Fdbm_delete, 1);
+ rb_define_method(C_DBM, "delete_if", Fdbm_delete_if, 0);
+ rb_define_method(C_DBM, "clear", Fdbm_clear, 0);
+ rb_define_method(C_DBM, "includes", Fdbm_has_key, 1);
+ rb_define_method(C_DBM, "has_key", Fdbm_has_key, 1);
+ rb_define_method(C_DBM, "has_value", Fdbm_has_value, 1);
+
+ rb_define_method(C_DBM, "to_a", Fdbm_to_a, 0);
+}
+#endif /* USE_DBM */