18941: history wrong after parse error during alias expansion

ChangeLog

@@ -1,5 +1,8 @@
 2003-08-11  Peter Stephenson  <pws@csr.com>
 
+	* 18941: Src/hist.c, Src/input.c: Alias text could end up in
+	history after a parsing error during alias expansion.
+
 	* 18938: Src/lex.c, Src/Math.c, Src/Zle/zle_main.c,
 	Src/Zle/compcore.c: Mark some data symbols for export, shutting
 	up Cygwin's dllwrap.  Note that c from zle_main.c is not marked

Src/hist.c

@@ -290,6 +290,8 @@ safeinungetc(int c)
 void
 herrflush(void)
 {
+    inpopalias();
+
     while (!lexstop && inbufct && !strin)
 	hwaddc(ingetc());
 }

Src/input.c

@@ -549,3 +549,17 @@ inpop(void)
 	inpoptop();
     } while (remcont);
 }
+
+/*
+ * Expunge any aliases from the input stack; they shouldn't appear
+ * in the history and need to be flushed explicitly when we encounter
+ * an error.
+ */
+
+/**/
+void
+inpopalias(void)
+{
+    while (inbufflags & INP_ALIAS)
+	inpoptop();
+}