more TDB

source/libs/tdb/src/db/tdbBtree.c

@@ -131,7 +131,7 @@ int tdbBtreeClose(SBTree *pBt) {
   return 0;
 }
 
-int tdbBtreeCursor(SBTC *pCur, SBTree *pBt) {
+int tdbBtcOpen(SBTC *pCur, SBTree *pBt) {
   pCur->pBt = pBt;
   pCur->iPage = -1;
   pCur->pPage = NULL;
@@ -210,7 +210,7 @@ int tdbBtreeGet(SBTree *pBt, const void *pKey, int kLen, void **ppVal, int *vLen
   void        *pVal;
   SCellDecoder cd;
 
-  tdbBtreeCursor(&btc, pBt);
+  tdbBtcOpen(&btc, pBt);
 
   tdbBtCursorMoveTo(&btc, pKey, kLen, &cret);
 
@@ -1072,3 +1072,28 @@ static int tdbBtreeCellSize(const SPage *pPage, SCell *pCell) {
 }
 
 #endif
+
+int tdbBtcMoveToFirst(SBTC *pBtc) {
+  // TODO
+  return 0;
+}
+
+int tdbBtcMoveToLast(SBTC *pBtc) {
+  // TODO
+  return 0;
+}
+
+int tdbBtcMoveTo(SBTC *pBtc, const void *pKey, int kLen) {
+  // TODO
+  return 0;
+}
+
+int tdbBtreeNext(SBTC *pBtc, void **ppKey, int *kLen, void **ppVal, int *vLen) {
+  // TODO
+  return 0;
+}
+
+int tdbBtcClose(SBTC *pBtc) {
+  // TODO
+  return 0;
+}
\ No newline at end of file

source/libs/tdb/src/db/tdbDb.c

@@ -20,6 +20,10 @@ struct STDB {
   SBTree *pBt;
 };
 
+struct STDBC {
+  SBTC btc;
+};
+
 int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprFn, STEnv *pEnv, STDB **ppDb) {
   STDB   *pDb;
   SPager *pPager;
@@ -75,7 +79,7 @@ int tdbDbInsert(STDB *pDb, const void *pKey, int keyLen, const void *pVal, int v
   int   ret;
 
   pCur = &btc;
-  ret = tdbBtreeCursor(pCur, pDb->pBt);
+  ret = tdbBtcOpen(pCur, pDb->pBt);
   if (ret < 0) {
     return -1;
   }
@@ -92,17 +96,38 @@ int tdbDbGet(STDB *pDb, const void *pKey, int kLen, void **ppVal, int *vLen) {
   return tdbBtreeGet(pDb->pBt, pKey, kLen, ppVal, vLen);
 }
 
-int tdbDbcOpen(STDB *pDb, STDBC **ppTDbc) {
-  // TODO
+int tdbDbcOpen(STDB *pDb, STDBC **ppDbc) {
+  int    ret;
+  STDBC *pDbc = NULL;
+
+  *ppDbc = NULL;
+  pDbc = malloc(sizeof(*pDbc));
+  if (pDbc == NULL) {
+    return -1;
+  }
+
+  tdbBtcOpen(&pDbc->btc, pDb->pBt);
+
+  // TODO: move to first now, we can move to any key-value
+  // and in any direction, design new APIs.
+  ret = tdbBtcMoveToFirst(&pDbc->btc);
+  if (ret < 0) {
+    ASSERT(0);
+    return -1;
+  }
+
+  *ppDbc = pDbc;
   return 0;
 }
 
 int tdbDbNext(STDBC *pDbc, void **ppKey, int *kLen, void **ppVal, int *vLen) {
-  // TODO
-  return 0;
+  return tdbBtreeNext(&pDbc->btc, ppKey, kLen, ppVal, vLen);
 }
 
 int tdbDbcClose(STDBC *pDbc) {
-  // TODO
+  if (pDbc) {
+    free(pDbc);
+  }
+
   return 0;
 }
\ No newline at end of file

source/libs/tdb/src/inc/tdbBtree.h

@@ -38,12 +38,20 @@ struct SBTC {
   void   *pBuf;
 };
 
+// SBTree
 int tdbBtreeOpen(int keyLen, int valLen, SPager *pFile, FKeyComparator kcmpr, SBTree **ppBt);
 int tdbBtreeClose(SBTree *pBt);
-int tdbBtreeCursor(SBTC *pCur, SBTree *pBt);
 int tdbBtCursorInsert(SBTC *pCur, const void *pKey, int kLen, const void *pVal, int vLen);
 int tdbBtreeGet(SBTree *pBt, const void *pKey, int kLen, void **ppVal, int *vLen);
 
+// SBTC
+int tdbBtcOpen(SBTC *pCur, SBTree *pBt);
+int tdbBtcMoveToFirst(SBTC *pBtc);
+int tdbBtcMoveToLast(SBTC *pBtc);
+int tdbBtcMoveTo(SBTC *pBtc, const void *pKey, int kLen);
+int tdbBtreeNext(SBTC *pBtc, void **ppKey, int *kLen, void **ppVal, int *vLen);
+int tdbBtcClose(SBTC *pBtc);
+
 #ifdef __cplusplus
 }
 #endif

source/libs/tdb/src/inc/tdbDb.h

@@ -31,7 +31,7 @@ int tdbDbInsert(STDB *pDb, const void *pKey, int keyLen, const void *pVal, int v
 int tdbDbGet(STDB *pDb, const void *pKey, int kLen, void **ppVal, int *vLen);
 
 // STDBC
-int tdbDbcOpen(STDB *pDb, STDBC **ppTDbc);
+int tdbDbcOpen(STDB *pDb, STDBC **ppDbc);
 int tdbDbNext(STDBC *pDbc, void **ppKey, int *kLen, void **ppVal, int *vLen);
 int tdbDbcClose(STDBC *pDbc);