1 files changed, 28 insertions, 23 deletions

diff --git a/lib/net/ftp.rb b/lib/net/ftp.rb
index 3c3353e9fe..6aa102f6f0 100644
--- a/lib/net/ftp.rb
+++ b/lib/net/ftp.rb
@@ -337,7 +337,7 @@ module Net
     # equal 2.
     def voidresp # :nodoc:
       resp = getresp
-      if resp[0] != ?2
+      if !resp.start_with?("2")
         raise FTPReplyError, resp
       end
     end
@@ -402,14 +402,14 @@ module Net
         conn = open_socket(host, port)
         if @resume and rest_offset
           resp = sendcmd("REST " + rest_offset.to_s)
-          if resp[0] != ?3
+          if !resp.start_with?("3")
             raise FTPReplyError, resp
           end
         end
         resp = sendcmd(cmd)
         # skip 2XX for some ftp servers
-        resp = getresp if resp[0] == ?2
-        if resp[0] != ?1
+        resp = getresp if resp.start_with?("2")
+        if !resp.start_with?("1")
           raise FTPReplyError, resp
         end
       else
@@ -418,14 +418,14 @@ module Net
           sendport(sock.addr[3], sock.addr[1])
           if @resume and rest_offset
             resp = sendcmd("REST " + rest_offset.to_s)
-            if resp[0] != ?3
+            if !resp.start_with?("3")
               raise FTPReplyError, resp
             end
           end
           resp = sendcmd(cmd)
           # skip 2XX for some ftp servers
-          resp = getresp if resp[0] == ?2
-          if resp[0] != ?1
+          resp = getresp if resp.start_with?("2")
+          if !resp.start_with?("1")
             raise FTPReplyError, resp
           end
           conn = BufferedSocket.new(sock.accept)
@@ -456,16 +456,16 @@ module Net
       resp = ""
       synchronize do
         resp = sendcmd('USER ' + user)
-        if resp[0] == ?3
+        if resp.start_with?("3")
           raise FTPReplyError, resp if passwd.nil?
           resp = sendcmd('PASS ' + passwd)
         end
-        if resp[0] == ?3
+        if resp.start_with?("3")
           raise FTPReplyError, resp if acct.nil?
           resp = sendcmd('ACCT ' + acct)
         end
       end
-      if resp[0] != ?2
+      if !resp.start_with?("2")
         raise FTPReplyError, resp
       end
       @welcome = resp
@@ -772,7 +772,7 @@ module Net
     #
     def rename(fromname, toname)
       resp = sendcmd("RNFR #{fromname}")
-      if resp[0] != ?3
+      if !resp.start_with?("3")
         raise FTPReplyError, resp
       end
       voidcmd("RNTO #{toname}")
@@ -783,9 +783,9 @@ module Net
     #
     def delete(filename)
       resp = sendcmd("DELE #{filename}")
-      if resp[0, 3] == "250"
+      if resp.start_with?("250")
         return
-      elsif resp[0] == ?5
+      elsif resp.start_with?("5")
         raise FTPPermError, resp
       else
         raise FTPReplyError, resp
@@ -810,16 +810,21 @@ module Net
       voidcmd(cmd)
     end
 
+    def get_body(resp) # :nodoc:
+      resp.slice(/\A[0-9a-zA-Z]{3} (.*)$/, 1)
+    end
+    private :get_body
+
     #
     # Returns the size of the given (remote) filename.
     #
     def size(filename)
       with_binary(true) do
         resp = sendcmd("SIZE #{filename}")
-        if resp[0, 3] != "213"
+        if !resp.start_with?("213")
           raise FTPReplyError, resp
         end
-        return resp[3..-1].strip.to_i
+        return get_body(resp).to_i
       end
     end
 
@@ -864,10 +869,10 @@ module Net
     #
     def system
       resp = sendcmd("SYST")
-      if resp[0, 3] != "215"
+      if !resp.start_with?("215")
         raise FTPReplyError, resp
       end
-      return resp[4 .. -1]
+      return get_body(resp)
     end
 
     #
@@ -902,8 +907,8 @@ module Net
     #
     def mdtm(filename)
       resp = sendcmd("MDTM #{filename}")
-      if resp[0, 3] == "213"
-        return resp[3 .. -1].strip
+      if resp.start_with?("213")
+        return get_body(resp)
       end
     end
 
@@ -971,7 +976,7 @@ module Net
     #
     # Returns host and port.
     def parse227(resp) # :nodoc:
-      if resp[0, 3] != "227"
+      if !resp.start_with?("227")
         raise FTPReplyError, resp
       end
       if m = /\((?<host>\d+(,\d+){3}),(?<port>\d+,\d+)\)/.match(resp)
@@ -987,7 +992,7 @@ module Net
     #
     # Returns host and port.
     def parse228(resp) # :nodoc:
-      if resp[0, 3] != "228"
+      if !resp.start_with?("228")
         raise FTPReplyError, resp
       end
       if m = /\(4,4,(?<host>\d+(,\d+){3}),2,(?<port>\d+,\d+)\)/.match(resp)
@@ -1024,7 +1029,7 @@ module Net
     #
     # Returns host and port.
     def parse229(resp) # :nodoc:
-      if resp[0, 3] != "229"
+      if !resp.start_with?("229")
         raise FTPReplyError, resp
       end
       if m = /\((?<d>[!-~])\k<d>\k<d>(?<port>\d+)\k<d>\)/.match(resp)
@@ -1040,7 +1045,7 @@ module Net
     #
     # Returns host and port.
     def parse257(resp) # :nodoc:
-      if resp[0, 3] != "257"
+      if !resp.start_with?("257")
         raise FTPReplyError, resp
       end
       if resp[3, 2] != ' "'