widl: Allow source location to span over multiple lines.

tools/widl/parser.y

@@ -2195,7 +2195,7 @@ static type_t *reg_typedefs(decl_spec_t *decl_spec, declarator_list_t *decls, at
        */
       if (cur && input_name == cur->where.input_name)
           error_loc( "%s: redefinition error; original definition was at %s:%d\n",
-                     cur->name, cur->where.input_name, cur->where.line_number );
+                     cur->name, cur->where.input_name, cur->where.first_line );
 
       name = declare_var(attrs, decl_spec, decl, 0);
       cur = type_new_alias(&name->declspec, name->name);
@@ -3392,8 +3392,9 @@ static statement_list_t *append_statement(statement_list_t *list, statement_t *s
 void init_location( struct location *where )
 {
     where->input_name = input_name ? input_name : "stdin";
-    where->line_number = line_number;
     where->near_text = parser_text;
+    where->first_line = line_number;
+    where->last_line = line_number;
 }
 
 type_t *find_parameterized_type(type_t *type, typeref_list_t *params)

tools/widl/utils.c

@@ -32,7 +32,7 @@
 #include "utils.h"
 #include "parser.h"
 
-#define CURRENT_LOCATION { input_name ? input_name : "stdin", line_number, parser_text }
+#define CURRENT_LOCATION { input_name ? input_name : "stdin", parser_text, line_number, 0, line_number, 0 }
 
 static const int want_near_indication = 0;
 
@@ -48,7 +48,7 @@ static void make_print(char *str)
 
 static void generic_msg( const struct location *where, const char *s, const char *t, va_list ap )
 {
-    fprintf( stderr, "%s:%d: %s: ", where->input_name, where->line_number, t );
+    fprintf( stderr, "%s:%d: %s: ", where->input_name, where->first_line, t );
     vfprintf( stderr, s, ap );
 
     if (want_near_indication)

tools/widl/widltypes.h

@@ -313,8 +313,11 @@ enum type_basic_type
 struct location
 {
     const char *input_name;
-    int line_number;
     const char *near_text;
+    int first_line;
+    int last_line;
+    int first_column;
+    int last_column;
 };
 
 struct str_list_entry_t