From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/erl_interface/src/decode/decode_string.c | 85 ++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 lib/erl_interface/src/decode/decode_string.c

(limited to 'lib/erl_interface/src/decode/decode_string.c')

diff --git a/lib/erl_interface/src/decode/decode_string.c b/lib/erl_interface/src/decode/decode_string.c
new file mode 100644
index 0000000000..bcbdca0438
--- /dev/null
+++ b/lib/erl_interface/src/decode/decode_string.c
@@ -0,0 +1,85 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 1998-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+#include <string.h>
+#include "eidef.h"
+#include "eiext.h"
+#include "putget.h"
+
+/* FIXME fix or document that special requirements on 
+   the in data.... */
+
+int ei_decode_string(const char *buf, int *index, char *p)
+{
+  const char *s = buf + *index;
+  const char *s0 = s;
+  int len;
+  int i;
+  int etype;
+
+  switch (get8(s)) {
+  case ERL_STRING_EXT:
+    len = get16be(s);
+
+    if (p) {
+      memmove(p,s,len); 
+      p[len] = (char)0;
+    }
+    s += len;
+    break;
+
+  case ERL_LIST_EXT:
+    /* Really long strings are represented as lists of small integers.
+     * We don't know in advance if the whole list is small integers,
+     * but we decode as much as we can, exiting early if we run into a
+     * non-character in the list.
+     */
+    len = get32be(s);
+    if (p) {
+      for (i=0; i<len; i++) {
+	if ((etype = get8(s)) != ERL_SMALL_INTEGER_EXT) {
+	  p[i] = (char)0;
+	  return -1;
+	}
+	p[i] = get8(s);
+      }
+      p[i] = (char)0;
+    }
+    else {
+      for (i=0; i<len; i++) {
+	if ((etype = get8(s)) != ERL_SMALL_INTEGER_EXT) return -1;
+	s++;
+      }
+    }
+    /* Check NIL tail */
+    if ((etype = get8(s)) != ERL_NIL_EXT) return -1;
+    break;
+
+  case ERL_NIL_EXT:
+    if (p) p[0] = (char)0;
+    break;
+    
+  default:
+    return -1;
+  }
+
+
+  *index += s-s0; 
+
+  return 0; 
+}
-- 
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