Populate tree.

1 files changed, 36 insertions, 0 deletions

diff --git a/src/lib/_io.rs b/src/lib/_io.rs
new file mode 100644
index 00000000..1f01c3b3
--- /dev/null
+++ b/src/lib/_io.rs
@@ -0,0 +1,36 @@
+type buf_reader = obj {
+  fn read(vec[u8] buf) -> uint;
+};
+
+type buf_writer = obj {
+  fn write(vec[u8] buf) -> uint;
+};
+
+fn mk_buf_reader(str s) -> buf_reader {
+
+  obj fd_reader(int fd) {
+    fn read(vec[u8] v) -> uint {
+      auto len = _vec.len[u8](v);
+      auto buf = _vec.buf[u8](v);
+      auto count = os.libc.read(fd, buf, len);
+      if (count < 0) {
+        log "error filling buffer";
+        log sys.rustrt.last_os_error();
+        fail;
+      } else {
+        ret uint(count);
+      }
+    }
+    drop {
+      os.libc.close(fd);
+    }
+  }
+
+  auto fd = os.libc.open(_str.buf(s), 0);
+  if (fd < 0) {
+    log "error opening file";
+    log sys.rustrt.last_os_error();
+    fail;
+  }
+  ret fd_reader(fd);
+}