added buffer_fwd_offset() so I don't have to alloc mem to ignore some chunk of a buffer

include/pcp/buffer.h

@@ -415,6 +415,17 @@ byte *buffer_get_remainder(Buffer *b);
 */
 size_t buffer_extract(Buffer *b, void *buf, size_t offset, size_t len);
 
+/** Forward read offset of given buffer. Use to ignore a couple of bytes.
+
+    \param[in] b The Buffer object to read from.
+    \param[in] fwdby Bytes to forward read offset.
+
+    \return Returns the size of bytes forwarded. Returns 0 in case of
+    an overflow, which can be catched with fatals_ifany().
+
+ */
+size_t buffer_fwd_offset(Buffer *b, size_t fwdby);
+
 /** Dump the Buffer contents to stderr in hex form.
 
     \param[in] b The Buffer object to dump.

libpcp/buffer.c

@@ -145,6 +145,19 @@ size_t buffer_get_chunk(Buffer *b, void *buf, size_t len) {
   return len;
 }
 
+size_t buffer_fwd_offset(Buffer *b, size_t fwdby) {
+  if(fwdby  > b->end - b->offset) {
+    final("[buffer %s] attempt to set offset %ld bytes forward data from buffer with %ld bytes left at offset %ld\n",
+	  b->name, fwdby, b->end - b->offset, b->offset);
+  }
+  else if(fwdby == 0) {
+    return 0;
+  }
+
+  b->offset += fwdby;
+  return fwdby;
+}
+
 size_t buffer_get_chunk_tobuf(Buffer *b, Buffer *dst, size_t len) {
   if(len > b->end - b->offset) {
     final("[buffer %s] attempt to read %ld bytes data from buffer with %ld bytes left at offset %ld\n",