Fix accesslog escape segfault (#1551)

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2664 152afb58-edef-0310-8abb-c4023f1b3aa9

src/mod_accesslog.c

@@ -159,6 +159,7 @@ INIT_FUNC(mod_accesslog_init) {
 static void accesslog_append_escaped(buffer *dest, buffer *str) {
 	/* replaces non-printable chars with \xHH where HH is the hex representation of the byte */
 	/* exceptions: " => \", \ => \\, whitespace chars => \n \t etc. */
+	if (str->used == 0) return;
 	buffer_prepare_append(dest, str->used - 1);
 
 	for (unsigned int i = 0; i < str->used - 1; i++) {

tests/LightyTest.pm

@@ -124,7 +124,7 @@ sub start_proc {
 	} elsif (defined $ENV{"TRACEME"} && $ENV{"TRACEME"} eq 'truss') {
 		$cmdline = "truss -a -l -w all -v all -o strace ".$cmdline;
 	} elsif (defined $ENV{"TRACEME"} && $ENV{"TRACEME"} eq 'gdb') {
-		$cmdline = "gdb --batch --ex 'run' --ex 'bt' --args ".$cmdline." > gdb.out";
+		$cmdline = "gdb --batch --ex 'run' --ex 'bt full' --args ".$cmdline." > gdb.out";
 	} elsif (defined $ENV{"TRACEME"} && $ENV{"TRACEME"} eq 'valgrind') {
 		$cmdline = "valgrind --tool=memcheck --show-reachable=yes --leak-check=yes --log-file=valgrind ".$cmdline;
 	}