* cplus-dem.c (demangle_signature): Recognize misplaced '_' to

avoid infinite loops while demangling bogus mangled names.
	* valprint.c (type_print_base):  Minor fix for GNU style guide
	conformance.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+Mon May 11 13:27:46 1992  Fred Fish  (fnf@cygnus.com)
+
+	* cplus-dem.c (demangle_signature):  Recognize misplaced '_' to
+	avoid infinite loops while demangling bogus mangled names.
+	* valprint.c (type_print_base):  Minor fix for GNU style guide
+	conformance.
+
 Sat May  9 18:02:17 1992  Fred Fish  (fnf at fishpond)
 
 	* Makefile.in (VERSION):  Bump to 4.5.3

gdb/cplus-dem.c

@@ -481,6 +481,15 @@ demangle_signature (declp, mangled, work)
 	    success = demangle_template (declp, mangled, work);
 	    break;
 
+	  case '_':
+	    /* At the outermost level, we cannot have a return type specified,
+	       so if we run into another '_' at this point we are dealing with
+	       a mangled name that is either bogus, or has been mangled by
+	       some algorithm we don't know how to deal with.  So just
+	       reject the entire demangling. */
+	    success = 0;
+	    break;
+
 	  default:
 #ifdef GNU_DEMANGLING
 	    /* Assume we have stumbled onto the first outermost function
@@ -497,7 +506,7 @@ demangle_signature (declp, mangled, work)
 	    break;
 	}
 #ifdef GNU_DEMANGLING
-      if (expect_func)
+      if (success && expect_func)
 	{
 	  func_done = 1;
 	  success = demangle_args (declp, mangled, work);