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MFC rev 201937:

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Implement the fo_readdir method.
This commit is contained in:
marcel 2010-01-16 04:24:10 +00:00
parent 4f6e5678b5
commit 4780cb8a56
1 changed files with 68 additions and 1 deletions
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69
lib/libstand/dosfs.c
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@ -47,6 +47,7 @@ static int dos_close(struct open_file *fd);
static int dos_read(struct open_file *fd, void *buf, size_t size, size_t *resid);
static off_t dos_seek(struct open_file *fd, off_t offset, int whence);
static int dos_stat(struct open_file *fd, struct stat *sb);
static int dos_readdir(struct open_file *fd, struct dirent *d);
struct fs_ops dosfs_fsops = {
"dosfs",
@ -56,7 +57,7 @@ struct fs_ops dosfs_fsops = {
null_write,
dos_seek,
dos_stat,
null_readdir
dos_readdir
};
#define SECSIZ 512 /* sector size */
@ -354,6 +355,72 @@ dos_stat(struct open_file *fd, struct stat *sb)
return (0);
}
static int
dos_readdir(struct open_file *fd, struct dirent *d)
{
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;
u_char fn[261];
DOS_DIR dd;
size_t res;
u_int chk, i, x, xdn;
int err;
x = chk = 0;
while (1) {
xdn = x;
x = 0;
err = dos_read(fd, &dd, sizeof(dd), &res);
if (err)
return (err);
if (res == sizeof(dd))
return (ENOENT);
if (dd.de.name[0] == 0)
return (ENOENT);
/* Skip deleted entries */
if (dd.de.name[0] == 0xe5)
continue;
/* Skip volume labels */
if (dd.de.attr & FA_LABEL)
continue;
if ((dd.de.attr & FA_MASK) == FA_XDE) {
if (dd.xde.seq & 0x40)
chk = dd.xde.chk;
else if (dd.xde.seq != xdn - 1 || dd.xde.chk != chk)
continue;
x = dd.xde.seq & ~0x40;
if (x < 1 || x > 20) {
x = 0;
continue;
}
cp_xdnm(fn, &dd.xde);
} else {
if (xdn == 1) {
x = 0;
for (i = 0; i < 11; i++) {
x = ((x & 1) << 7) | (x >> 1);
x += dd.de.name[i];
x &= 0xff;
}
if (x == chk)
break;
} else {
cp_sfn(fn, &dd.de);
break;
}
x = 0;
}
}
d->d_fileno = dd.de.clus[1] << 8 + dd.de.clus[0];
d->d_reclen = sizeof(*d);
d->d_type = (dd.de.attr & FA_DIR) ? DT_DIR : DT_REG;
memcpy(d->d_name, fn, sizeof(d->d_name));
return(0);
}
/*
* Parse DOS boot sector
*/