some fixes

include/fh_input.h

@@ -15,15 +15,22 @@ typedef bool (*fh_input_refill_t)(struct fh_thread_s *fh, struct fh_input_spec_s
 /** Spec free func */
 typedef void (*fh_input_free_t)(void *spec);
 
+typedef void (*fh_input_start_t)(struct fh_thread_s *fh, struct fh_input_spec_s *spec);
+
+typedef void (*fh_input_pushpop_t)(struct fh_thread_s *fh, struct fh_input_spec_s *spec);
+
 struct fh_input_spec_s {
   struct fh_input_spec_s *previous;
   fh_input_refill_t refill_input_buffer;
+  fh_input_start_t start;
   fh_input_free_t free_self;
+  fh_input_pushpop_t push_prepare;
+  fh_input_pushpop_t pop_restore;
   uint32_t linenum;
   char *cwd; // CWD of the input, used for relative includes. malloc'd (strdup)
 
   // saved values, filled when pushing
-  char saved_buffer[INPUT_BUFFER_SIZE];
+  uint32_t saved_inputaddr;
   uint32_t saved_inputptr;
   uint32_t saved_inputlen;
   uint32_t saved_execptr;

include/fh_runtime.h

@@ -193,6 +193,8 @@ struct fh_thread_s {
   /** Pictured numeric output buffer write cursor (used for prepend) */
   uint32_t pictnumptr;
 
+  /** Start addr of the input string (SOURCE) */
+  uint32_t inputaddr;
   /** Input buffer parse position */
   uint32_t inputptr;
   /** Input buffer total content size */