From 58bd5facb2f4926e14453254e7af50d2f93f3ca2 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 30 Jun 2014 14:59:44 +0000
Subject: string.c: rb_fstring_new

* string.c (rb_fstring_new): create fstring from pointer and
  length.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46626 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 internal.h |  1 +
 string.c   | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/internal.h b/internal.h
index 6409da3d1a..1546b219e8 100644
--- a/internal.h
+++ b/internal.h
@@ -899,6 +899,7 @@ size_t rb_strftime(char *s, size_t maxsize, const char *format, rb_encoding *enc
 
 /* string.c */
 VALUE rb_fstring(VALUE);
+VALUE rb_fstring_new(const char *ptr, long len);
 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);
diff --git a/string.c b/string.c
index 80190548be..b802d9d09b 100644
--- a/string.c
+++ b/string.c
@@ -225,6 +225,27 @@ rb_fstring(VALUE str)
     return fstr;
 }
 
+static VALUE
+setup_fake_str(struct RString *fake_str, const char *name, long len)
+{
+    fake_str->basic.flags = T_STRING|RSTRING_NOEMBED|ELTS_SHARED;
+    /* SHARED to be allocated by the callback */
+
+    RBASIC_SET_CLASS((VALUE)fake_str, rb_cString);
+    fake_str->as.heap.len = len;
+    fake_str->as.heap.ptr = (char *)name;
+    fake_str->as.heap.aux.capa = len;
+    return (VALUE)fake_str;
+}
+
+VALUE
+rb_fstring_new(const char *ptr, long len)
+{
+    struct RString fake_str;
+
+    return rb_fstring(setup_fake_str(&fake_str, ptr, len));
+}
+
 static int
 fstring_set_class_i(st_data_t key, st_data_t val, st_data_t arg)
 {
-- 
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