X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/e7e2badf7ebc4b6aeaf03366ad6fe6b919713d54..a73a4c8cb85f03d9863db77f85adb4db42a91286:/emufs/idx.c

diff --git a/emufs/idx.c b/emufs/idx.c
index 52f3b59..cfb798e 100644
--- a/emufs/idx.c
+++ b/emufs/idx.c
@@ -1,20 +1,76 @@
+/* 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 18:10:35 ART 2004
+ * Autores: Nicolás Dimov <sagardua@uolsinectis.com.ar>
+ *----------------------------------------------------------------------------
+ *
+ * $Id$
+ *
+ */
+
+/** \file
+ *
+ * Manejo de archivos de índice de registros.
+ * 
+ * Implementación del manejo de archivos de índice de registros.
+ *
+ */
+
 #include "idx.h"
-#include "tipo3.h"
+#include <stdlib.h>
+#include <strings.h>
+
+FILE* emufs_idx_abrir(EMUFS* efs, const char* mode)
+{
+	FILE* f;
+	char* filename;
+
+	filename = (char*) malloc(sizeof(char) * (strlen(efs->nombre)
+				+ strlen(EMUFS_IDX_EXT) + 1));
+	if (filename == NULL) {
+		/* TODO Manejo de errores */
+		return NULL;
+	}
+	strcpy(filename, efs->nombre);
+	strcat(filename, EMUFS_IDX_EXT);
+	f = fopen(filename, mode);
+	free(filename);
+	return f;
+}
 
 int emufs_idx_buscar_mayor_id(EMUFS *emu)
 {
 	int id, max = -1;
 	FILE *f_idx;	
-	BLOCK_REG_T reg;
-	char name_f_idx[255];
+	EMUFS_IDX reg;
+	char name_f_idx[255]; /* TODO usar malloc para no limitar el tamaño de nombre de archivo */
 
 	strcpy(name_f_idx,emu->nombre);
-	strcat(name_f_idx,".idx");
+	strcat(name_f_idx, EMUFS_IDX_EXT);
 
 	if ( (f_idx = fopen(name_f_idx,"r")) == NULL) return -1; /*ERROR*/
+	id = -1;
 	while ( !feof(f_idx) ){
 		/* Me aseguro de leer la cantidad de bytes correcta */
-		if (fread(&reg,sizeof(BLOCK_REG_T),1,f_idx) != 1) continue;
+		if (fread(&reg,sizeof(EMUFS_IDX),1,f_idx) != 1) continue;
 		if ( reg.id_reg >= max ) 
 			max = reg.id_reg;
 	}
@@ -23,3 +79,46 @@ int emufs_idx_buscar_mayor_id(EMUFS *emu)
 
 	return id;	
 }
+
+/*busca el registro ID en el archivo "block_reg.dat" y devuelve el nro de bloque en el que se encuentra*/
+int emufs_idx_buscar_registro(EMUFS *emu, int ID)
+{
+	FILE* f_idx;
+	EMUFS_IDX reg;
+	char name_f_idx[255];
+	strcpy(name_f_idx,emu->nombre);
+	strcat(name_f_idx, EMUFS_IDX_EXT);
+	
+	if ( (f_idx = fopen(name_f_idx,"r")) == NULL) return -1; /*ERROR*/
+	reg.id_reg = -1;
+	reg.block = -1;
+	while ( !feof(f_idx) ){
+		if (fread(&reg,sizeof(EMUFS_IDX),1,f_idx) != 1) continue;
+		if ( reg.id_reg == ID ){
+			break;
+		}
+	}
+	
+	fclose(f_idx);
+	return reg.block;
+}
+
+/* agrega un registro al final del archivo */
+int emufs_idx_agregar(EMUFS *emu, int num_bloque, int ID_aux)
+{
+	FILE *f_idx;
+	EMUFS_IDX reg;
+	char name_f_idx[255];
+	
+	strcpy(name_f_idx,emu->nombre);
+	strcat(name_f_idx, EMUFS_IDX_EXT);
+
+	if ( (f_idx = fopen(name_f_idx,"a+"))==NULL ) return -1;
+		
+	reg.block = num_bloque;
+	reg.id_reg = ID_aux;
+	fwrite(&reg,sizeof(EMUFS_IDX),1,f_idx); 
+	fclose(f_idx);
+	return 0;
+}
+