Bug fix---remove VLAs from codebase.

The Windows C compiler doesn't support variable length arrays.  It's now
considered optional in C11, so might as well avoid them.

Makefile

@@ -22,7 +22,7 @@ UNAME   := $(shell uname)
 VERSION := $(shell git describe --tag)
 
 ifeq ($(VERSION),)
-  VERSION=v2.0.5
+  VERSION=v2.0.6
 endif
 
 # ===================================================

org.conman.dns-2.0.5-1.rockspec → org.conman.dns-2.0.6-1.rockspec

@@ -1,10 +1,10 @@
 package = "org.conman.dns"
-version = "2.0.5-1"
+version = "2.0.6-1"
 
 source = 
 {
   url = "git+https://github.com/spc476/SPCDNS.git",
-  tag = "v2.0.5"
+  tag = "v2.0.6"
 }
 
 description =

src/codec.c

@@ -619,6 +619,8 @@ static inline dns_rcode_t encode_edns0rr_nsid(
 )
 {
   size_t newlen;
+  size_t nidx;
+  size_t i;
 
   assert(econtext_okay(data));
   assert(opt       != NULL);
@@ -635,18 +637,12 @@ static inline dns_rcode_t encode_edns0rr_nsid(
   if (data->packet.size < newlen + sizeof(uint16_t) + sizeof(uint16_t))
     return RCODE_NO_MEMORY;
 
-  char   buffer[newlen + 1];
-  size_t nidx;
-  size_t i;
-
-  for (i = nidx = 0 ; i < opt->len ; i++ , nidx += 2)
-    sprintf(&buffer[nidx],"%02X",opt->data[i]);
-
-  assert(newlen == strlen(buffer));
-
   write_uint16(&data->packet,opt->code);
   write_uint16(&data->packet,newlen);
-  memcpy(data->packet.ptr,buffer,newlen);
+
+  for (i = nidx = 0 ; i < opt->len ; i++ , nidx += 2)
+    sprintf((char *)&data->packet.ptr[nidx],"%02X",opt->data[i]);
+
   data->packet.ptr  += newlen;
   data->packet.size -= newlen;
   return RCODE_OKAY;
@@ -1676,7 +1672,19 @@ static dns_rcode_t dloc_double(
   if (len > data->parse.size - 1)
     return RCODE_FORMAT_ERROR;
 
-  char buffer[len + 1];
+  /*-----------------------------------------------------------------------
+  ; Microsoft C compilers don't support VLAs.  So I'm picking an arbitrary
+  ; limit that hopefully won't break things.  I'm not sure what the actual
+  ; length limit is for a double value (as a string to be parsed), so I
+  ; checked some C code, found a 36 digit double number, then doubled that.
+  ; Hopefully this is good enough.
+  ;------------------------------------------------------------------------*/
+
+  char buffer[72];
+
+  if (len >= sizeof(buffer))
+    return RCODE_FORMAT_ERROR;
+
   memcpy(buffer,&data->parse.ptr[1],len);
   buffer[len++] = '\0';