Add encoding parameter for fdspawn

Closes gh-92

1 files changed, 6 insertions, 3 deletions

diff --git a/pexpect/fdpexpect.py b/pexpect/fdpexpect.py
index 2b51e24..ca8cf07 100644
--- a/pexpect/fdpexpect.py
+++ b/pexpect/fdpexpect.py
@@ -32,7 +32,8 @@ class fdspawn(SpawnBase):
     descriptor. For example, you could use it to read through a file looking
     for patterns, or to control a modem or serial device. '''
 
-    def __init__ (self, fd, args=None, timeout=30, maxread=2000, searchwindowsize=None, logfile=None):
+    def __init__ (self, fd, args=None, timeout=30, maxread=2000, searchwindowsize=None,
+                  logfile=None, encoding=None, codec_errors='strict'):
         '''This takes a file descriptor (an int) or an object that support the
         fileno() method (returning an int). All Python file-like objects
         support fileno(). '''
@@ -50,7 +51,8 @@ class fdspawn(SpawnBase):
 
         self.args = None
         self.command = None
-        SpawnBase.__init__(self, timeout, maxread, searchwindowsize, logfile)
+        SpawnBase.__init__(self, timeout, maxread, searchwindowsize, logfile,
+                           encoding=encoding, codec_errors=codec_errors)
         self.child_fd = fd
         self.own_fd = False
         self.closed = False
@@ -93,7 +95,8 @@ class fdspawn(SpawnBase):
         s = self._coerce_send_string(s)
         self._log(s, 'send')
         
-        return os.write(self.child_fd, s)
+        b = self._encoder.encode(s, final=False)
+        return os.write(self.child_fd, b)
     
     def sendline(self, s):
         "Write to fd with trailing newline, return number of bytes written"