+
+/* Check if text-conversion and eol-conversion of CODING_SYSTEM are
+ decided for writing to a process. If not, complement them, and
+ return a new coding system. */
+
+Lisp_Object
+complement_process_encoding_system (Lisp_Object coding_system)
+{
+ Lisp_Object coding_base = Qnil, eol_base = Qnil;
+ Lisp_Object spec, attrs;
+ int i;
+
+ for (i = 0; i < 3; i++)
+ {
+ if (i == 1)
+ coding_system = CDR_SAFE (Vdefault_process_coding_system);
+ else if (i == 2)
+ coding_system = preferred_coding_system ();
+ spec = CODING_SYSTEM_SPEC (coding_system);
+ if (NILP (spec))
+ continue;
+ attrs = AREF (spec, 0);
+ if (NILP (coding_base) && ! EQ (CODING_ATTR_TYPE (attrs), Qundecided))
+ coding_base = CODING_ATTR_BASE_NAME (attrs);
+ if (NILP (eol_base) && ! VECTORP (AREF (spec, 2)))
+ eol_base = coding_system;
+ if (! NILP (coding_base) && ! NILP (eol_base))
+ break;
+ }
+
+ if (i > 0)
+ /* The original CODING_SYSTEM didn't specify text-conversion or
+ eol-conversion. Be sure that we return a fully complemented
+ coding system. */
+ coding_system = coding_inherit_eol_type (coding_base, eol_base);
+ return coding_system;
+}
+
+