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/*
* 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"
static int is_initialized = 0;
static Stream_t *Subdir;
static char subdir_name[VBUFSIZE];
static Stream_t *fss[256]; /* open drives */
static char last_drive; /* last opened drive */
static void finish_sc(void)
{
int i;
FREE(&Subdir);
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;
last_drive = '\0';
for(i=0; i<256; i++)
fss[i]=0;
Subdir= NULL;
subdir_name[0]='\0';
atexit(finish_sc);
}
Stream_t *open_subdir(MainParam_t *mp, const char *arg,
int flags,int mode, int lock)
{
int drive;
Stream_t *Fs;
char pathname[MAX_PATH];
init_streamcache();
mp->drivename = drive = get_drive(arg, *(mp->mcwd));
/* open the drive */
if(fss[drive])
Fs = fss[drive];
else {
Fs = fs_init(drive, flags);
if (!Fs){
fprintf(stderr, "Cannot initialize '%c:'\n", drive);
return NULL;
}
fss[drive] = Fs;
}
get_name(arg, mp->filename, mp->mcwd);
get_path(arg, pathname, mp->mcwd, mode);
if(mp->pathname)
strcpy(mp->pathname, pathname);
if (last_drive != drive ||
strcasecmp(pathname,subdir_name)){
FREE(&Subdir);
Subdir = subdir(Fs, pathname, lock);
last_drive = drive;
strcpy(subdir_name, pathname);
}
return COPY(Subdir);
}
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