diff options
author | marcel <marcel@FreeBSD.org> | 2010-01-09 22:33:34 +0000 |
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committer | marcel <marcel@FreeBSD.org> | 2010-01-09 22:33:34 +0000 |
commit | 764d98dd0b25136984bd06758c3b7d0a80e14b65 (patch) | |
tree | 45d8857e312eb1749ed9d609413092e903fb86b7 | |
parent | 50127402ea5bbe11c6447220728a48d34a46692f (diff) | |
download | FreeBSD-src-764d98dd0b25136984bd06758c3b7d0a80e14b65.zip FreeBSD-src-764d98dd0b25136984bd06758c3b7d0a80e14b65.tar.gz |
Implement the fo_readdir method. This does not support long
file names.
Obtained from: Juniper Networks, Inc.
MFC after: 1 week
-rw-r--r-- | lib/libstand/dosfs.c | 69 |
1 files changed, 68 insertions, 1 deletions
diff --git a/lib/libstand/dosfs.c b/lib/libstand/dosfs.c index 161d330..5ba10c1 100644 --- a/lib/libstand/dosfs.c +++ b/lib/libstand/dosfs.c @@ -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 */ |