X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/e7e2badf7ebc4b6aeaf03366ad6fe6b919713d54..2b317be73e4cfc0751df22597752cd98ce51740c:/emufs/did.c

diff --git a/emufs/did.c b/emufs/did.c
index 0e3b79f..5c386b5 100644
--- a/emufs/did.c
+++ b/emufs/did.c
@@ -1,33 +1,97 @@
+/* vim: set noexpandtab tabstop=4 shiftwidth=4:
+ *----------------------------------------------------------------------------
+ *                                  emufs
+ *----------------------------------------------------------------------------
+ * This file is part of emufs.
+ *
+ * emufs is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * emufs is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with emufs; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place, Suite 330, Boston, MA  02111-1307  USA
+ *----------------------------------------------------------------------------
+ * Creado:  jue abr  8 18:07:57 ART 2004
+ * Autores: Nicolás Dimov <sagardua@uolsinectis.com.ar>
+ *          Leandro Lucarella <llucare@fi.uba.ar>
+ *----------------------------------------------------------------------------
+ *
+ * $Id$
+ *
+ */
+
+/** \file
+ *
+ * Manejo de archivos de índices de registros borrados (reutilizables).
+ * 
+ * Implementación del manejo de archivos de índices de registros borrados
+ * (reutilizables).
+ *
+ */
+
 #include "did.h"
+#include <string.h>
+#include <unistd.h>
+
+/* Crea un archivo de ID's Liberados. */
+int emufs_did_crear(EMUFS* efs)
+{
+	return emufs_crear_archivo_auxiliar(efs->nombre, EMUFS_DID_EXT);
+}
 
-int emufs_did_get_last(EMUFS *emu)
+/* Devuelve el ID Libre, liberado mas recientemente (pila) */
+EMUFS_REG_ID emufs_did_get_last(EMUFS *efs)
 {
-	FILE * f_did;
-	int id, offset;
+	FILE *f_did;
+	EMUFS_REG_ID n_RegId;
+	EMUFS_OFFSET n_Offset;
 	char name_f_did[255];
 	
-	strcpy(name_f_did, emu->nombre);
-	strcat(name_f_did, ".did");
+	strcpy(name_f_did, efs->nombre);
+	strcat(name_f_did, EMUFS_DID_EXT);
 	
 	if ( (f_did = fopen(name_f_did,"r")) == NULL) return -1; /*ERROR*/
 	fseek(f_did, 0, SEEK_END);
 	
 	if (ftell(f_did) > 0){
 		/* si el archivo no esta vacio es porque hay un nro disponible*/
-		fseek(f_did, -sizeof(int),SEEK_END);
+		fseek(f_did, -sizeof(EMUFS_REG_ID),SEEK_END);
 		/* leo el ultimo numero */
-		fread(&id,sizeof(int),1,f_did);
+		fread(&n_RegId,sizeof(EMUFS_REG_ID),1,f_did);
 		/* voy al final */
 		fseek(f_did, 0, SEEK_END);
 		/* mido el tamaño del archivo*/
-		offset = ftell(f_did);
+		n_Offset = ftell(f_did);
 		fclose(f_did);
 		/*lo trunco */
-		truncate(name_f_did, offset - sizeof(int));
+		truncate(name_f_did, n_Offset - sizeof(EMUFS_REG_ID));
 	} else {
 		fclose(f_did);
 		/* si el archivo esta vacio */
-		id = -1;
+		n_RegId = -1;
 	}
-	return id;
+	return n_RegId;
+}
+
+/* Agrega un registro al archivo de ID's Libres (pila) */
+int emufs_did_agregar(EMUFS *efs, EMUFS_REG_ID n_RegId)
+{
+	FILE *f_did;
+	char name_f_did[255];
+	
+	strcpy(name_f_did, efs->nombre);
+	strcat(name_f_did,  EMUFS_DID_EXT);
+	
+	if ( (f_did = fopen(name_f_did,"a+")) == NULL) return -1;
+	fwrite(&n_RegId, sizeof(EMUFS_REG_ID), 1, f_did);
+	fclose(f_did);
+	
+	return 0;
 }