minix/commands/i386/mtools-3.9.7/fat_free.c
2005-04-21 14:53:53 +00:00

55 lines
1.2 KiB
C
Executable file

#include "sysincludes.h"
#include "msdos.h"
#include "fsP.h"
#include "mtoolsDirent.h"
/*
* Remove a string of FAT entries (delete the file). The argument is
* the beginning of the string. Does not consider the file length, so
* if FAT is corrupted, watch out!
*/
int fat_free(Stream_t *Dir, unsigned int fat)
{
Stream_t *Stream = GetFs(Dir);
DeclareThis(Fs_t);
unsigned int next_no_step;
/* a zero length file? */
if (fat == 0)
return(0);
/* CONSTCOND */
while (!This->fat_error) {
/* get next cluster number */
next_no_step = fatDecode(This,fat);
/* mark current cluster as empty */
fatDeallocate(This,fat);
if (next_no_step >= This->last_fat)
break;
fat = next_no_step;
}
return(0);
}
int fatFreeWithDir(Stream_t *Dir, struct directory *dir)
{
unsigned int first;
if((!strncmp(dir->name,". ",8) ||
!strncmp(dir->name,".. ",8)) &&
!strncmp(dir->ext," ",3)) {
fprintf(stderr,"Trying to remove . or .. entry\n");
return -1;
}
first = START(dir);
if(fat32RootCluster(Dir))
first |= STARTHI(dir) << 16;
return fat_free(Dir, first);
}
int fatFreeWithDirentry(direntry_t *entry)
{
return fatFreeWithDir(entry->Dir, &entry->dir);
}