Changeset 375 for trunk/gsdl/src/recpt

Timestamp:

1999-07-14T11:24:06+12:00 (25 years ago)

Author:

rjmcnab

Message:

Added functionality to modify a gdbm database.

Location:

trunk/gsdl/src/recpt

Files:

• infodbclass.cpp (modified) (2 diffs)
• infodbclass.h (modified) (1 diff)

trunk/gsdl/src/recpt/infodbclass.cpp

@@ -12 +12 @@
 /*
    $Log$
+   Revision 1.2  1999/07/13 23:24:05  rjmcnab
+   Added functionality to modify a gdbm database.
+
    Revision 1.1  1999/07/11 08:27:52  rjmcnab
    Moved from src/colservr and added capability to write out data.
@@ -182 +185 @@
 
 
+void gdbmclass::deletekey (const text_t &key) {
+  if (gdbmfile == NULL) return;
+
+  // get a utf-8 encoded c string of the unicode key
+  datum key_data;
+  key_data.dptr = (to_utf8(key)).getcstr();
+  if (key_data.dptr == NULL) return;
+  key_data.dsize = strlen (key_data.dptr);
+
+  // delete the key
+  gdbm_delete (gdbmfile, key_data);
+
+  // free up the key memory
+  delete key_data.dptr;
+}
+
+
+// getfirstkey and getnextkey are used for traversing the database
+// no insertions or deletions should be carried out while traversing
+// the database. when there are no keys left to visit in the database
+// an empty string is returned.
+text_t gdbmclass::getfirstkey () {
+  if (gdbmfile == NULL) return "";
+
+  // get the first key
+  datum firstkey_data = gdbm_firstkey (gdbmfile);
+  if (firstkey_data.dptr == NULL) return "";
+
+  // convert it to text_t
+  text_t firstkey;
+  firstkey.setcarr (firstkey_data.dptr, firstkey_data.dsize);
+  free (firstkey_data.dptr);
+  return to_uni(firstkey);  // convert to unicode
+}
+
+text_t gdbmclass::getnextkey (const text_t &key) {
+  if (gdbmfile == NULL || key.empty()) return "";
+
+  // get a utf-8 encoded c string of the unicode key
+  datum key_data;
+  key_data.dptr = (to_utf8(key)).getcstr();
+  if (key_data.dptr == NULL) return "";
+  key_data.dsize = strlen (key_data.dptr);
+  
+  // get the next key
+  datum nextkey_data = gdbm_nextkey (gdbmfile, key_data);
+  if (nextkey_data.dptr == NULL) {
+    delete key_data.dptr;
+    return "";
+  }
+
+  // convert it to text_t
+  text_t nextkey;
+  nextkey.setcarr (nextkey_data.dptr, nextkey_data.dsize);
+  free (nextkey_data.dptr);
+  delete key_data.dptr;
+  return to_uni(nextkey);  // convert to unicode
+}
+
 
 // replaces the .fc, .lc, .pr, .ns and .ps syntax (first child, 

trunk/gsdl/src/recpt/infodbclass.h

@@ -101 +101 @@
   // returns true on success
   bool setinfo (const text_t &key, const infodbclass &info);
+
+  void deletekey (const text_t &key);
+
+  // getfirstkey and getnextkey are used for traversing the database
+  // no insertions or deletions should be carried out while traversing
+  // the database. when there are no keys left to visit in the database
+  // an empty string is returned.
+  text_t getfirstkey ();
+  text_t getnextkey (const text_t &key);
   
 protected: