Allow "readline" to be used even if "history" is unavailable...

CHANGES

@@ -16,6 +16,9 @@ Changes in 0.26:
 	
 	Rewrite the man pages using standard "man" troff macros.
 
+	Enable the (limited) use of readline on systems which don't
+	have readline/history.h.
+
 
 Changes in 0.25:
 	Fixed Sorcerer's Apprentice bug in both the client and the

Makefile

@@ -56,8 +56,7 @@ acconfig.h.in: configure.in aclocal.m4
 	autoheader -f
 
 configure: configure.in aclocal.m4
-	rm -f MCONFIG configure config.log acconfig.h
-	rm -rf *.cache
+	rm -f MCONFIG configure config.log acconfig.h config.cache
 	autoconf
 
 version.h: version

configure.in

@@ -151,15 +151,14 @@ PA_WITH_BOOL(readline, 1,
 [  --without-readline      disable the use of readline command-line editing],
 [
 	USE_READLINE=true
-	AC_CHECK_HEADER(readline/readline.h, [], [USE_READLINE=false])
-	AC_CHECK_HEADER(readline/history.h, [], [USE_READLINE=false])
-	if $USE_READLINE
-	then
+	AC_CHECK_HEADER(readline/readline.h,
+	[
 		AC_SEARCH_LIBS(readline, [readline history],
 		[
 			AC_DEFINE(WITH_READLINE)
 		])
-	fi
+		AC_CHECK_HEADERS(readline/history.h)
+	])
 ],:)
 
 TFTP_LIBS="$LIBS"

tftp/main.c

@@ -71,8 +71,10 @@ static const char *rcsid UNUSED =
 #include <fcntl.h>
 #ifdef WITH_READLINE
 #include <readline/readline.h>
+#ifdef HAVE_READLINE_HISTORY_H
 #include <readline/history.h>
 #endif
+#endif
 
 #include "extern.h"
 
@@ -237,7 +239,9 @@ main(int argc, char *argv[])
 		(void)putchar('\n');
 
 #ifdef WITH_READLINE
+#ifdef HAVE_READLINE_HISTORY_H
 	using_history();
+#endif
 #endif
 
 	command();
@@ -269,7 +273,9 @@ getmoreargs(const char *partial, const char *mprompt)
   strcpy(line, partial);
   strcpy(line+len, eline);
 
+#ifdef HAVE_READLINE_HISTORY_H
   add_history(line);
+#endif
 #else
   int len = strlen(partial);
   
@@ -689,7 +695,9 @@ command(void)
 		if ((line[0] == 0) || (line[0] == '\n'))
 			continue;
 #ifdef WITH_READLINE
+#ifdef HAVE_READLINE_HISTORY_H
 		add_history(line);
+#endif
 #endif
 		makeargv();
 		if (margc == 0)