(read_process_output): Fix previous change, i.e, if

proc_encode_coding_system[p->outfd] is NULL, instead of allocating
`struct coding_system' for encoding, just skip setting up coding
system for encoding.  Set Vlast_coding_system_used after some text
is read.
(send_process): Set Vlast_coding_system_used after deciding a
coding system to be used for encoding.

1 files changed, 13 insertions, 7 deletions

diff --git a/src/process.c b/src/process.c
index d05071824de..ef0cd07d883 100644
--- a/src/process.c
+++ b/src/process.c
@@ -2807,15 +2807,17 @@ read_process_output (proc, channel)
              proc_decode_coding_system[channel] here.  It is done in
              detect_coding called via decode_coding above.  */
 
-          /* If coding-system for encoding is not yet decided, we set it
-             as the same as coding-system for decoding.  */
-          if (NILP (p->encode_coding_system))
+          /* If coding-system for encoding is not yet decided, we set
+             it as the same as coding-system for decoding.
+
+             But, before doing that we must check if
+             proc_encode_coding_system[p->outfd] surely points to a
+             valid memory because p->outfd will be changed once EOF is
+             sent to the process.  */
+          if (NILP (p->encode_coding_system)
+              && proc_encode_coding_system[p->outfd])
             {
               p->encode_coding_system = coding->symbol;
-              if (!proc_encode_coding_system[p->outfd])
-                proc_encode_coding_system[p->outfd]
-                  = ((struct coding_system *)
-                     xmalloc (sizeof (struct coding_system)));
               setup_coding_system (coding->symbol,
                                    proc_encode_coding_system[p->outfd]);
             }
@@ -2846,6 +2848,8 @@ read_process_output (proc, channel)
     }
 #endif
 
+  Vlast_coding_system_used = coding->symbol;
+
   outstream = p->filter;
   if (!NILP (outstream))
     {
@@ -3047,6 +3051,8 @@ send_process (proc, buf, len, object)
     error ("Output file descriptor of %s is closed", procname);
 
   coding = proc_encode_coding_system[XINT (XPROCESS (proc)->outfd)];
+  Vlast_coding_system_used = coding->symbol;
+
   if (CODING_REQUIRE_ENCODING (coding))
     {
       int require = encoding_buffer_size (coding, len);