X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/d43fee2497586978337034b2ebd963cfeb1929ff..b172089853a56455742c11dfaf940544f57fef70:/emufs/fsc.c

diff --git a/emufs/fsc.c b/emufs/fsc.c
index f5d6d06..05218a6 100644
--- a/emufs/fsc.c
+++ b/emufs/fsc.c
@@ -1,43 +1,86 @@
+/* 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; 
 	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;
 }
 
 /* busca el bloque y le resta fs de espacio libre */
-int emufs_fsc_actualizar(EMUFS *emu, int num_bloque, int fs)
+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);
+			fseek(f_fsc,-sizeof(EMUFS_FSC),SEEK_CUR);
+			fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);
 			break;
 		}
 	}
@@ -46,14 +89,14 @@ int emufs_fsc_actualizar(EMUFS *emu, int num_bloque, int fs)
 }
 
 /* me devuelve el ID del bloque donde quepa un registro, y guarda en fs el espacio libre que queda en el bloque */
-int emufs_fsc_buscar_lugar(EMUFS *emu, unsigned long tam, int *fs)
+EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE tam, 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);
 
 	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
 
@@ -63,10 +106,10 @@ int emufs_fsc_buscar_lugar(EMUFS *emu, unsigned long tam, int *fs)
 	reg.block = -1;
 	*fs = emu->tam_bloque;
 	while( !feof(f_fsc) ){
-		if (fread(&reg,sizeof(BLOCK_FREE_T),1,f_fsc) != 1) continue;
-		if ( reg.free_space >= tam+sizeof(int)) 
+		if (fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
+		if (reg.free_space >= tam) {
 			break;
-		else {
+		} else {
 			reg.block = -1;
 			*fs = emu->tam_bloque;
 		}
@@ -78,19 +121,19 @@ int emufs_fsc_buscar_lugar(EMUFS *emu, unsigned long tam, int *fs)
 	return reg.block;
 }
 
-int emufs_fsc_get_fs(EMUFS *emu, int num_bloque)
+EMUFS_FREE emufs_fsc_get_fs(EMUFS *emu, EMUFS_BLOCK_ID num_bloque)
 {
 	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);
 
 	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 )
 			break;
 	}
@@ -98,3 +141,4 @@ int emufs_fsc_get_fs(EMUFS *emu, int num_bloque)
 	fclose(f_fsc);
 	return reg.free_space;
 }
+