sep_get_val_by_name - get header value by name
ierr=sep_get_val_by_name(tag_history,record_number,key_name,n_values,value)
tag of History File
Header Record Number computed using sep_get_subspace_pointers
Key Name of Header Key
Number of Values to be written in contiguos records
Header Values of type Key Type
-1= if fails for other reasons
0= if successful
+1= if tag_history is a Sep77 History File
+2= if tag_history is a Sep3d History File but no matching Key Name is in Header Format File
Get header values by key name
return=sep_get_header_bytes(char *tag_history, int *n_bytes) return=sep_get_key_index(char *tag_history, char *key_name, int *key_index); i_byte=(record_number-1)*n_bytes+(key_index-1)*n_bytes_value sseek into the Header Format File at position i_byte sreed2 from Header Format File into value
sep3d