emufs/fsc.c

   1 #include "fsc.h"
   2 #include "tipo3.h"
   3
   4 int emufs_fsc_agregar(EMUFS *emu, int num_bloque, int fs)
   5 {
   6         FILE *f_fsc;
   7         BLOCK_FREE_T reg;
   8         char name_f_fsc[255];
   9
  10         strcpy(name_f_fsc,emu->nombre);
  11         strcat(name_f_fsc,".fsc");
  12
  13         /*cargo el registro*/
  14         reg.block = num_bloque; /*no incremento cant, porque grabe el nuevo bloque antes y no lo conte!!*/
  15         reg.free_space = fs;
  16         /*lo guardo en el archivo al final  "a+"*/
  17         if ( (f_fsc = fopen(name_f_fsc,"a+"))==NULL ) return -1;
  18         fwrite(&reg,sizeof(BLOCK_FREE_T),1,f_fsc);
  19         fclose(f_fsc);
  20         return 0;
  21 }
  22
  23 int emufs_fsc_actualizar(EMUFS *emu, int num_bloque, int fs)
  24 {
  25         FILE *f_fsc;
  26         BLOCK_FREE_T reg;
  27         char name_f_fsc[255];
  28
  29         strcpy(name_f_fsc,emu->nombre);
  30         strcat(name_f_fsc,".fsc");
  31
  32         /*busco el bloque que modifique*/
  33         if ( (f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1;
  34         while ( !feof(f_fsc) ){
  35                 if ( fread(&reg,sizeof(BLOCK_FREE_T),1,f_fsc) != 1) continue;
  36                 if ( reg.block == num_bloque ){
  37                         reg.free_space -= fs;
  38                         fseek(f_fsc,-sizeof(BLOCK_FREE_T),SEEK_CUR);
  39                         fwrite(&reg,sizeof(BLOCK_FREE_T),1,f_fsc);
  40                         break;
  41                 }
  42         }
  43         fclose(f_fsc);
  44         return 0;
  45 }