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-rw-r--r--lib/std/dir+plan9.myr66
1 files changed, 66 insertions, 0 deletions
diff --git a/lib/std/dir+plan9.myr b/lib/std/dir+plan9.myr
new file mode 100644
index 0000000..41a579f
--- /dev/null
+++ b/lib/std/dir+plan9.myr
@@ -0,0 +1,66 @@
+use sys
+
+use "alloc.use"
+use "die.use"
+use "option.use"
+use "result.use"
+use "slcp.use"
+use "sldup.use"
+use "syswrap.use"
+use "types.use"
+
+pkg std =
+ type dir = struct
+ fd : fd
+ buf : byte[65536] /* a big big, but at least it will always hold a directory entry... */
+ len : int64
+ off : int64
+ ;;
+
+ const diropen : (p : byte[:] -> std.result(dir#, byte[:]))
+ const dirread : (d : dir# -> std.option(byte[:]))
+ const dirclose : (d : dir# -> void)
+;;
+
+const diropen = {p
+ var fd
+ var dir
+
+ fd = open(p, Ordonly)
+ if fd < 0
+ -> `Fail "couldn't open directory"
+ ;;
+
+ dir = zalloc()
+ dir.fd = fd
+ -> `Ok dir
+}
+
+
+const dirread = {d
+ var len : int64, name, base, namelen, dirlen
+
+ /* NB: On Plan 9, read(2) will always return whole directory entries */
+ if d.off >= d.len
+ len = read(d.fd, d.buf[:]) castto(int64)
+ if len <= 0
+ -> `None
+ ;;
+ d.len = len
+ d.off = 0
+ ;;
+
+ namelen = (d.buf[d.off + Stringsoff] castto(int64)) | \
+ ((d.buf[d.off + Stringsoff + 1] castto(int64)) << 8)
+ base = d.off + Stringsoff + 2
+ dirlen = (d.buf[d.off] castto(int64)) | \
+ ((d.buf[d.off + 1] castto(int64)) << 8)
+ name = d.buf[base:base + namelen]
+ d.off += dirlen + 2
+ -> `Some std.sldup(name)
+}
+
+const dirclose = {d
+ close(d.fd)
+ free(d)
+}