implement an extension that an interactive mode input line, when

starting with an ‘!’ exclamation mark at the beginning of a com-
mand (PS1 not PS2), shall have the same effect as the predefined
“r” alias, to be compatible with csh and GNU bash’s “!string” to
«Execute last used command starting with string» – documentation
and feature request provided by wbx@ (Waldemar Brodkorb)

sh.h

@@ -122,7 +122,7 @@
 #define __SCCSID(x)	__IDSTRING(sccsid,x)
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.303 2009/05/27 09:58:23 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.304 2009/05/27 19:52:38 tg Exp $");
 #endif
 #define MKSH_VERSION "R38 2009/05/27"
 
@@ -576,6 +576,9 @@ EXTERN char shell_flags[FNFLAGS];
 EXTERN char null[] I__("");
 /* helpers for string pooling */
 #define T_synerr "syntax error"
+EXTERN const char r_fc_e_[] I__("r=fc -e -");
+#define fc_e_	(r_fc_e_ + 2)		/* "fc -e -" */
+#define fc_e_n	7			/* strlen(fc_e_) */
 
 enum temp_type {
 	TT_HEREDOC_EXP,	/* expanded heredoc */