Do input validation in various functions in function.c and complete.c

darcs-hash:20060608000145-ac50b-1088c3f5e3c1ad2759c13400e5dda2d21858fedc.gz

fallback.h

@@ -16,6 +16,19 @@
 #define WCHAR_MAX INT_MAX
 #endif
 
+/**
+   Make sure __func__ is defined to some string. This should be the
+   currently compiled function, but not all compilers support this
+   feature.
+*/
+#if __STDC_VERSION__ < 199901L
+# if __GNUC__ >= 2
+#  define __func__ __FUNCTION__
+# else
+#  define __func__ "<unknown>"
+# endif
+#endif
+
 /**
    Under curses, tputs expects an int (*func)(char) as its last
    parameter, but in ncurses, tputs expects a int (*func)(int) as its