From: Nicolás Dimov <ndimov@gmail.com>
Date: Tue, 25 May 2004 21:23:47 +0000 (+0000)
Subject: primera parte del insertar
X-Git-Tag: svn_import_r684~200
X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/commitdiff_plain/289dcaa6f45429b0c68e1490743b9d73d698678e

primera parte del insertar
---

diff --git a/emufs/b_plus.c b/emufs/b_plus.c
index 61e7b4c..ab84026 100644
--- a/emufs/b_plus.c
+++ b/emufs/b_plus.c
@@ -8,7 +8,8 @@ int b_plus_grabar_nodo(INDEXSPECS *idx, NODO_B_PLUS *nodo, int num_node);
 NODO_B_PLUS *b_plus_crearnodo(INDEXSPECS *idx);
 int b_plus_destruir_nodo(NODO_B_PLUS *nodo);
 /*int b_plus_insertar_clave(INDEXSPECS *idx, INDEX_DAT *query);*/
-
+int b_plus_insert_nonfull(INDEXSPECS *idx, NODO_B_PLUS *nodo, int num_nodo, int num_nodo_padre, CLAVE clave);
+int b_plus_split_child(INDEXSPECS *idx,NODO_B_PLUS *new_root, int ,NODO_B_PLUS* raiz);
 /**#*#*#*#*#**#*#*#*#*#*FIN PROTOTYPES*#*#*#*#*#**#*#*#*#*#**#*#*#*#*#*/
 
 /** Crea un nuevo nodo y lo inicializa */
@@ -276,3 +277,66 @@ int b_plus_destruir_nodo(NODO_B_PLUS *nodo)
 	free(nodo);
 	return 0;
 }
+
+int b_plus_insert_nonfull(INDEXSPECS *idx, NODO_B_PLUS *nodo, int num_nodo, int num_nodo_padre, CLAVE clave)
+{
+    int i, num_nodo_hijo;
+    NODO_B_PLUS *hijo;
+    
+    i = nodo->cant_claves;
+    if ( nodo->nivel == 0 ){
+        while ( i >= 1 && clave.i_clave < nodo->claves[i] ){
+            nodo->claves[i+1] = nodo->claves[i];
+            i--;
+        }
+        nodo->claves[i+1] = clave.i_clave;
+        nodo->cant_claves++;
+        b_plus_destruir_nodo(nodo);
+        b_plus_grabar_nodo(idx, nodo, num_nodo);
+    } else { 
+        while ( i >= 1 && clave.i_clave < nodo->claves[i] ) 
+            i--;
+        i++;
+        num_nodo_hijo = nodo->hijos[i-1];
+        hijo = b_plus_leer_nodo(idx, num_nodo_hijo);
+        if ( hijo->cant_claves == idx->size_claves/sizeof(int) ) {
+            b_plus_split_child(idx, nodo, i, hijo);
+            if ( clave.i_clave > nodo->claves[i] )
+                i++;
+        }
+        b_plus_insert_nonfull(idx, hijo, num_nodo_hijo, num_nodo_padre);
+    }
+    b_plus_destruir_nodo(hijo);
+    return 0;
+}    
+
+int b_tree_insertar(INDEXSPECS *idx, CLAVE clave)
+{
+    NODO_B_PLUS *raiz;
+    
+    raiz = b_plus_leer_nodo(idx, 0);
+    if ( raiz->cant_claves == idx->size_claves/sizeof(int) ) {
+        NODO_B_PLUS *new_root = b_plus_crearnodo(idx);
+        new_root->nivel = raiz->nivel + 1;
+        new_root->hijos[0] = b_plus_get_num_nodo(idx);
+        b_plus_grabar_nodo(idx, raiz, new_root->hijos[0]);
+        b_plus_grabar_nodo(idx, new_root, 0);
+        b_plus_split_child(idx, new_root, 1, raiz);
+        b_plus_insert_nonfull(idx, new_root, 0, clave);
+    } else b_plus_insert_nonfull(idx, raiz, 0, clave);
+    
+    return 0;
+}
+
+int b_plus_get_num_nodo(INDEXSPECS *idx)
+{
+	FILE *fp;
+	int num;
+	
+	fp = fopen(idx->filename, "r+");
+	if (fp == NULL) return -1;
+    
+    num = ftell(fp)/sizeof(NODO_B_PLUS);
+    fclose(fp);
+    return num;
+}