init

fdio.v

@@ -0,0 +1,73 @@
+module runcmd
+
+import io
+import os
+
+struct ReadFd {
+	fd int
+}
+
+// read reads the `buf.len` bytes from file descriptor and returns number of
+// bytes read on success. This function implements the `io.Reader` interface.
+pub fn (mut f ReadFd) read(mut buf []u8) !int {
+	if buf.len == 0 {
+		return io.Eof{}
+	}
+	nbytes := int(C.read(f.fd, buf.data, buf.len))
+	if nbytes == -1 {
+		return os.last_error()
+	}
+	if nbytes == 0 {
+		return io.Eof{}
+	}
+	return nbytes
+}
+
+// slurp reads all data from file descriptor (until gets `io.Eof`) and returns
+// result as byte array.
+pub fn (mut f ReadFd) slurp() ![]u8 {
+	mut res := []u8{}
+	bufsize := 4096
+	for {
+		mut buf := []u8{len: bufsize, cap: bufsize}
+		nbytes := f.read(mut buf) or {
+			if err is io.Eof {
+				break
+			} else {
+				return err
+			}
+		}
+		if nbytes == 0 {
+			break
+		}
+		res << buf
+	}
+	return res
+}
+
+// close closes the underlying file descriptor.
+pub fn (mut f ReadFd) close() ! {
+	fd_close(f.fd)!
+}
+
+struct WriteFd {
+	fd int
+}
+
+// write writes the `buf.len` bytes to the file descriptor and returns number
+// of bytes written on success. This function implements the `io.Writer` interface.
+pub fn (mut f WriteFd) write(buf []u8) !int {
+	if buf.len == 0 {
+		return 0
+	}
+	nbytes := int(C.write(f.fd, buf.data, buf.len))
+	if nbytes == -1 {
+		return os.last_error()
+	}
+	return nbytes
+}
+
+// close closes the underlying file descriptor.
+pub fn (mut f WriteFd) close() ! {
+	fd_close(f.fd)!
+}