readline.c: use rb_setup_fake_str

* ext/readline/readline.c (readline_s_delete_text): initialize a
  fake string by rb_setup_fake_str().

* internal.h (rb_setup_fake_str): allow extensions to call.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47555 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/readline/depend

@@ -1,4 +1,5 @@
 readline.o: readline.c $(HDRS) $(ruby_headers) \
+  $(top_srcdir)/internal.h \
   $(hdrdir)/ruby/io.h \
   $(hdrdir)/ruby/encoding.h \
   $(hdrdir)/ruby/oniguruma.h \

ext/readline/extconf.rb

@@ -105,4 +105,5 @@ unless readline.have_type("rl_hook_func_t*")
   $defs << "-Drl_hook_func_t=Function"
 end
 
+$INCFLAGS << " -I$(top_srcdir)"
 create_makefile("readline")

ext/readline/readline.c

@@ -36,6 +36,7 @@
 #include "ruby/ruby.h"
 #include "ruby/io.h"
 #include "ruby/thread.h"
+#include "internal.h"
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
@@ -688,12 +689,7 @@ readline_s_delete_text(int argc, VALUE *argv, VALUE self)
         char *p, *ptr = rl_line_buffer;
         long beg = 0, len = strlen(rl_line_buffer);
         struct RString fakestr;
-        VALUE str = (VALUE)&fakestr;
-
-        fakestr.basic.flags = T_STRING | RSTRING_NOEMBED;
-        fakestr.as.heap.ptr = ptr;
-        fakestr.as.heap.len = len;
-        rb_enc_associate(str, rb_locale_encoding());
+        VALUE str = rb_setup_fake_str(&fakestr, ptr, len, rb_locale_encoding());
         OBJ_FREEZE(str);
         if (argc == 2) {
             beg = NUM2LONG(argv[0]);

internal.h

@@ -906,9 +906,6 @@ size_t rb_strftime(char *s, size_t maxsize, const char *format, rb_encoding *enc
 void Init_frozen_strings(void);
 VALUE rb_fstring(VALUE);
 VALUE rb_fstring_new(const char *ptr, long len);
-#ifdef RUBY_ENCODING_H
-VALUE rb_setup_fake_str(struct RString *fake_str, const char *name, long len, rb_encoding *enc);
-#endif
 int rb_str_buf_cat_escaped_char(VALUE result, unsigned int c, int unicode_p);
 int rb_str_symname_p(VALUE);
 VALUE rb_str_quote_unprintable(VALUE);
@@ -1062,6 +1059,12 @@ VALUE rb_gcd_normal(VALUE self, VALUE other);
 VALUE rb_gcd_gmp(VALUE x, VALUE y);
 #endif
 
+/* string.c */
+#ifdef RUBY_ENCODING_H
+/* internal use */
+VALUE rb_setup_fake_str(struct RString *fake_str, const char *name, long len, rb_encoding *enc);
+#endif
+
 /* util.c */
 extern const signed char ruby_digit36_to_number_table[];