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--- gcc/c-common.c.orig Sun Jun 18 06:09:26 2000
+++ gcc/c-common.c  Mon Jun 26 20:15:08 2000
@@ -154,7 +154,7 @@
                         int, int, int));
 static void init_attributes        PARAMS ((void));
 static void record_function_format PARAMS ((tree, tree, enum format_type,
-                        int, int));
+                        int, int, int));
 static void record_international_format    PARAMS ((tree, tree, int));
 static int default_valid_lang_attribute PARAMS ((tree, tree, tree, tree));
 
@@ -805,6 +805,7 @@
        enum format_type format_type;
        tree argument;
        unsigned int arg_num;
+       int null_format_ok;
 
        if (TREE_CODE (decl) != FUNCTION_DECL)
          {
@@ -815,7 +816,7 @@
 
        if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
          {
-       error ("unrecognized format specifier");
+       error_with_decl (decl, "unrecognized format specifier");
        continue;
          }
        else
@@ -823,12 +824,26 @@
        const char *p = IDENTIFIER_POINTER (format_type_id);
 
        if (!strcmp (p, "printf") || !strcmp (p, "__printf__"))
+         {
+         format_type = printf_format_type;
+         null_format_ok = 0;
+         }
+       else if (!strcmp (p, "printf0") || !strcmp (p, "__printf0__"))
+         {
          format_type = printf_format_type;
+         null_format_ok = 1;
+         }
        else if (!strcmp (p, "scanf") || !strcmp (p, "__scanf__"))
+         {
          format_type = scanf_format_type;
+         null_format_ok = 0;
+         }
        else if (!strcmp (p, "strftime")
             || !strcmp (p, "__strftime__"))
+         {
          format_type = strftime_format_type;
+         null_format_ok = 0;
+         }
        else
          {
            warning ("`%s' is an unrecognized format function type", p);
@@ -901,7 +916,8 @@
 
        record_function_format (DECL_NAME (decl),
                    DECL_ASSEMBLER_NAME (decl),
-                   format_type, format_num, first_arg_num);
+                   format_type, format_num, first_arg_num,
+                   null_format_ok);
        break;
      }
 
@@ -1207,6 +1223,11 @@
 } format_char_info;
 
 static format_char_info print_char_table[] = {
+/* FreeBSD kernel extensions.  */
+  { "D",   1,  T_C,    T_C,    NULL,   NULL,   NULL,   NULL,   NULL,   "-wp"       },
+  { "b",   1,  T_C,    T_C,    NULL,   NULL,   NULL,   NULL,   NULL,   "-wp"       },
+  { "rz",  0,  NULL,   T_I,    T_I,    T_L,    NULL,   NULL,   NULL,   "-wp0 +#"   },
+#define unextended_print_char_table    (print_char_table + 3)
   { "di",  0,  T_I,    T_I,    T_I,    T_L,    T_LL,   T_LL,   T_ST,   "-wp0 +"    },
   { "oxX", 0,  T_UI,   T_UI,   T_UI,   T_UL,   T_ULL,  T_ULL,  T_ST,   "-wp0#"     },
   { "u",   0,  T_UI,   T_UI,   T_UI,   T_UL,   T_ULL,  T_ULL,  T_ST,   "-wp0"      },
@@ -1269,6 +1290,7 @@
   enum format_type format_type;    /* type of format (printf, scanf, etc.) */
   int format_num;      /* number of format argument */
   int first_arg_num;       /* number of first arg (zero for varargs) */
+  int null_format_ok;      /* TRUE if the format string may be NULL */
 } function_format_info;
 
 static function_format_info *function_format_list = NULL;
@@ -1299,25 +1321,25 @@
 init_function_format_info ()
 {
   record_function_format (get_identifier ("printf"), NULL_TREE,
-             printf_format_type, 1, 2);
+             printf_format_type, 1, 2, 0);
   record_function_format (get_identifier ("fprintf"), NULL_TREE,
-             printf_format_type, 2, 3);
+             printf_format_type, 2, 3, 0);
   record_function_format (get_identifier ("sprintf"), NULL_TREE,
-             printf_format_type, 2, 3);
+             printf_format_type, 2, 3, 0);
   record_function_format (get_identifier ("scanf"), NULL_TREE,
-             scanf_format_type, 1, 2);
+             scanf_format_type, 1, 2, 0);
   record_function_format (get_identifier ("fscanf"), NULL_TREE,
-             scanf_format_type, 2, 3);
+             scanf_format_type, 2, 3, 0);
   record_function_format (get_identifier ("sscanf"), NULL_TREE,
-             scanf_format_type, 2, 3);
+             scanf_format_type, 2, 3, 0);
   record_function_format (get_identifier ("vprintf"), NULL_TREE,
-             printf_format_type, 1, 0);
+             printf_format_type, 1, 0, 0);
   record_function_format (get_identifier ("vfprintf"), NULL_TREE,
-             printf_format_type, 2, 0);
+             printf_format_type, 2, 0, 0);
   record_function_format (get_identifier ("vsprintf"), NULL_TREE,
-             printf_format_type, 2, 0);
+             printf_format_type, 2, 0, 0);
   record_function_format (get_identifier ("strftime"), NULL_TREE,
-             strftime_format_type, 3, 0);
+             strftime_format_type, 3, 0, 0);
 
   record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
   record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
@@ -1335,12 +1357,13 @@
 
 static void
 record_function_format (name, assembler_name, format_type,
-           format_num, first_arg_num)
+           format_num, first_arg_num, null_format_ok)
       tree name;
       tree assembler_name;
       enum format_type format_type;
       int format_num;
       int first_arg_num;
+      int null_format_ok;
 {
   function_format_info *info;
 
@@ -1364,6 +1387,7 @@
   info->format_type = format_type;
   info->format_num = format_num;
   info->first_arg_num = first_arg_num;
+  info->null_format_ok = null_format_ok;
 }
 
 /* Record information for the names of function that modify the format
@@ -1515,7 +1539,8 @@
 
   if (integer_zerop (format_tree))
     {
-      warning ("null format string");
+      if (!info->null_format_ok)
+   warning ("null format string");
       return;
     }
   if (TREE_CODE (format_tree) != ADDR_EXPR)
@@ -1704,12 +1729,13 @@
             It will work on most machines, because size_t and int
             have the same mode.  But might as well warn anyway,
             since it will fail on other machines.  */
+         /* XXX should we allow unsigned ints here?  */
          if ((TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
               != integer_type_node)
              &&
              (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
               != unsigned_type_node))
-           warning ("field width is not type int (arg %d)", arg_num);
+           warning ("precision is not type int (arg %d)", arg_num);
        }
        }
      else
@@ -1754,6 +1780,53 @@
        }
        }
    }
+      if (*format_chars == 'b')
+   {
+     /* There should be an int arg to control the string arg.  */
+     if (params == 0)
+       {
+         tfaff ();
+         return;
+       }
+       if (info->first_arg_num != 0)
+       {
+         cur_param = TREE_VALUE (params);
+         params = TREE_CHAIN (params);
+         ++arg_num;
+         if ((TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
+          != integer_type_node)
+         &&
+         (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
+          != unsigned_type_node))
+       {
+         warning ("bitmap is not type int (arg %d)", arg_num);
+       }
+       }
+   }
+      if (*format_chars == 'D')
+   {
+     /* There should be an unsigned char * arg before the string arg.  */
+     if (params == 0)
+       {
+         tfaff ();
+         return;
+       }
+       if (info->first_arg_num != 0)
+       {
+         cur_param = TREE_VALUE (params);
+         params = TREE_CHAIN (params);
+         ++arg_num;
+         cur_type = TREE_TYPE (cur_param);
+         if (TREE_CODE (cur_type) != POINTER_TYPE
+         || TYPE_MAIN_VARIANT (TREE_TYPE (cur_type))
+            != unsigned_char_type_node)
+       {
+         warning ("ethernet address is not type unsigned char *"
+              " (arg %d)",
+              arg_num);
+       }
+       }
+   }
 
       aflag = 0;
 
@@ -1822,7 +1895,8 @@
       switch (info->format_type)
    {
    case printf_format_type:
-     fci = print_char_table;
+     fci = flag_format_extensions ? print_char_table
+       : unextended_print_char_table;
      break;
    case scanf_format_type:
      fci = scan_char_table;
@@ -1859,7 +1933,7 @@
       if (index (fci->flag_chars, '2') != 0)
    warning ("`%%%c' yields only last 2 digits of year", format_char);
       else if (index (fci->flag_chars, '3') != 0)
-   warning ("`%%%c' yields only last 2 digits of year in some locales",
+   warning ("`%%%c' yields only last 2 digits of year in some locales on non-BSD systems",
         format_char);
       if (precise && index (fci->flag_chars, 'p') == 0)
    warning ("precision used with `%c' format", format_char);