strncpy() causes reset

i'm trying take parse http reply uploading data pachube.com.  i'm using ehtercard.h , has function tcpreply() returns http response, is

http/1.1 200 ok
date: fri, 13 apr 2012 12:17:36 gmt
content-type: text/plain; charset=utf-8
connection: close
x-pachube-logging-key: logging.lo55oprx5dl5uwaw2nuo
x-pachuberequestid: 2ea1be6efb47aac0a0f47ec04196b14f721f605c
cache-control: max-age=0
content-length: 1
age: 0
vary: accept-encoding


according strlen() it's 308 bytes long.  want use strtok (using \n delimiter) parse each line, first i'm using strncpy() prevent
a invalid conversion 'const char*' 'char*'

but sketch seems failing @ strncpy() function , reboots before strtok().  below code, can tell me doing wrong?

code: [select]

 
  const char* reply = ether.tcpreply(session);    // part of ethercard.h library
  if (reply != 0)
  {
    char reply2[strlen(reply)+1];
    strncpy(reply2, reply, sizeof(reply));  // think arduino rebooting here
    reply2[strlen(reply)] = '\0';
   
    char delims[] = "\n";
    char *result = null;
    result = strtok( reply2, delims );
    while( result != null )
    {
        serial.println(result);
        result = strtok( null, delims );
    }
  }


if reply 308 bytes , reply2 309 bytes, that's 617 bytes of ram 1 operation.

could running out of memory?

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