minix/commands/i386/mtools-3.9.7/streamcache.c

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2005-04-21 16:53:53 +02:00
/*
* streamcache.c
* Managing a cache of open disks
*/
#include "sysincludes.h"
#include "msdos.h"
#include "mtools.h"
#include "vfat.h"
#include "fs.h"
#include "mainloop.h"
#include "plain_io.h"
#include "file.h"
static int is_initialized = 0;
static Stream_t *fss[256]; /* open drives */
static void finish_sc(void)
{
int i;
for(i=0; i<256; i++){
if(fss[i] && fss[i]->refs != 1 )
fprintf(stderr,"Streamcache allocation problem:%c %d\n",
i, fss[i]->refs);
FREE(&(fss[i]));
}
}
static void init_streamcache(void)
{
int i;
if(is_initialized)
return;
is_initialized = 1;
for(i=0; i<256; i++)
fss[i]=0;
atexit(finish_sc);
}
Stream_t *open_root_dir(char *drive, int flags)
{
Stream_t *Fs;
int i, k;
init_streamcache();
k = -1;
for(i=0; i<256; i++) {
if (fss[i] == NULL || strcmp(getDrive(fss[i]), drive) == 0) {
k = i;
break;
}
}
if(k == -1) {
fprintf(stderr, "Cannot initialize '%s:', out of table space\n",
drive);
return NULL;
}
/* open the drive */
if(fss[k])
Fs = fss[k];
else {
Fs = fs_init(drive, flags);
if (!Fs){
fprintf(stderr, "Cannot initialize '%s:'\n", drive);
return NULL;
}
fss[k] = Fs;
}
return OpenRoot(Fs);
}