X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/7a86d06abb03ced86951067cf341f228acfc9f30..b172089853a56455742c11dfaf940544f57fef70:/emufs/fsc.c

diff --git a/emufs/fsc.c b/emufs/fsc.c
index b8e0db4..05218a6 100644
--- a/emufs/fsc.c
+++ b/emufs/fsc.c
@@ -1,45 +1,144 @@
+/* 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:  vie abr  9 16:17:50 ART 2004
+ * Autores: Nicolás Dimov <sagardua@uolsinectis.com.ar>
+ *          Leandro Lucarella <llucare@fi.uba.ar>
+ *----------------------------------------------------------------------------
+ *
+ * $Id$
+ *
+ */
+
+/** \file
+ *
+ * Archivo para administrar el espacio libre disponible.
+ * 
+ * Implementación del archivo para administrar el espacio libre disponible.
+ *
+ */
+
 #include "fsc.h"
-#include "tipo3.h"
+#include <string.h>
+#include <unistd.h>
+
+int emufs_fsc_crear(EMUFS* efs)
+{
+	return emufs_crear_archivo_auxiliar(efs->nombre, EMUFS_FSC_EXT);
+}
 
-int emufs_fsc_agregar(EMUFS *emu, int num_bloque, int fs)
+int emufs_fsc_agregar(EMUFS *emu, EMUFS_BLOCK_ID num_bloque, EMUFS_FREE fs)
 {
 	FILE *f_fsc;
-	BLOCK_FREE_T reg;
+	EMUFS_FSC reg;
 	char name_f_fsc[255];
 	
 	strcpy(name_f_fsc,emu->nombre);
-	strcat(name_f_fsc,".fsc");
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
 	
 	/*cargo el registro*/
-	reg.block = num_bloque; /*no incremento cant, porque grabe el nuevo bloque antes y no lo conte!!*/
+	reg.block = num_bloque; 
 	reg.free_space = fs;
 	/*lo guardo en el archivo al final  "a+"*/
 	if ( (f_fsc = fopen(name_f_fsc,"a+"))==NULL ) return -1;
-	fwrite(&reg,sizeof(BLOCK_FREE_T),1,f_fsc);
+	fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);
 	fclose(f_fsc);
 	return 0;
 }
 
-int emufs_fsc_actualizar(EMUFS *emu, int num_bloque, int fs)
+/* busca el bloque y le resta fs de espacio libre */
+int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID num_bloque, EMUFS_FREE fs)
 {
 	FILE *f_fsc;
-	BLOCK_FREE_T reg;
+	EMUFS_FSC reg;
 	char name_f_fsc[255];
 	
 	strcpy(name_f_fsc,emu->nombre);
-	strcat(name_f_fsc,".fsc");
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
 
 	/*busco el bloque que modifique*/
 	if ( (f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1; 
 	while ( !feof(f_fsc) ){
-		if ( fread(&reg,sizeof(BLOCK_FREE_T),1,f_fsc) != 1) continue;
+		if ( fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
 		if ( reg.block == num_bloque ){
-			reg.free_space -= fs;
-			fseek(f_fsc,-sizeof(BLOCK_FREE_T),SEEK_CUR);
-			fwrite(&reg,sizeof(BLOCK_FREE_T),1,f_fsc);
+			reg.free_space = fs;
+			fseek(f_fsc,-sizeof(EMUFS_FSC),SEEK_CUR);
+			fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);
 			break;
 		}
 	}
 	fclose(f_fsc);
 	return 0;
 }
+
+/* me devuelve el ID del bloque donde quepa un registro, y guarda en fs el espacio libre que queda en el bloque */
+EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE tam, EMUFS_FREE *fs)
+{
+	FILE *f_fsc;
+	EMUFS_FSC reg;
+	char name_f_fsc[255];
+	
+	strcpy(name_f_fsc,emu->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
+
+	/* Inicializo la estructura para evitar que si el archivo esta vacio
+	 * el resultado sea correcto
+	 */
+	reg.block = -1;
+	*fs = emu->tam_bloque;
+	while( !feof(f_fsc) ){
+		if (fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
+		if (reg.free_space >= tam) {
+			break;
+		} else {
+			reg.block = -1;
+			*fs = emu->tam_bloque;
+		}
+	}
+	
+	fclose(f_fsc);
+	if (reg.block != -1)
+		*fs = reg.free_space;
+	return reg.block;
+}
+
+EMUFS_FREE emufs_fsc_get_fs(EMUFS *emu, EMUFS_BLOCK_ID num_bloque)
+{
+	FILE *f_fsc;
+	EMUFS_FSC reg;
+	char name_f_fsc[255];
+	
+	strcpy(name_f_fsc,emu->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
+
+	while ( !feof(f_fsc) ){
+		if ( fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1 ) continue;
+		if ( reg.block == num_bloque )
+			break;
+	}
+		
+	fclose(f_fsc);
+	return reg.free_space;
+}
+