This introduces a RESIZE-FILE-LIMIT

[pforth] / csrc / pf_inner.c

diff --git a/csrc/pf_inner.c b/csrc/pf_inner.c
index 0a6c003..2e5aac6 100644 (file)
--- a/csrc/pf_inner.c
+++ b/csrc/pf_inner.c
@@ -199,6 +199,24 @@ static void TraceNames( ExecToken Token, cell_t Level )
 /* Use local copy of CODE_BASE for speed. */
 #define LOCAL_CODEREL_TO_ABS( a ) ((cell_t *) (((cell_t) a) + CodeBase))
 
 /* Use local copy of CODE_BASE for speed. */
 #define LOCAL_CODEREL_TO_ABS( a ) ((cell_t *) (((cell_t) a) + CodeBase))
 

+/* Truncate the unsigned double cell integer LO/HI to an uint64_t. */
+static uint64_t UdToUint64( ucell_t Lo, ucell_t Hi )
+{
+    return (( 2 * sizeof(ucell_t) == sizeof(uint64_t) )
+           ? (((uint64_t)Lo) | (((uint64_t)Hi) >> (sizeof(ucell_t) * 8)))
+           : Lo );
+}
+
+/* Return TRUE if the unsigned double cell integer LO/HI is not greater
+ * then the greatest uint64_t.
+ */
+static int UdIsUint64( ucell_t Lo, ucell_t Hi )
+{
+    return (( 2 * sizeof(ucell_t) == sizeof(uint64_t) )
+           ? TRUE
+           : Hi == 0 );
+}
+

 static const char *pfSelectFileModeCreate( int fam );
 static const char *pfSelectFileModeOpen( int fam );
 
 static const char *pfSelectFileModeCreate( int fam );
 static const char *pfSelectFileModeOpen( int fam );
 


@@ -1106,6 +1124,17 @@ DBUG(("XX ah,m,l = 0x%8x,%8x,%8x - qh,l = 0x%8x,%8x\n", ah,am,al, qh,ql ));
            }
            endcase;
 
            }
            endcase;
 

+       case ID_FILE_RESIZE: /* ( ud fileid -- ior ) */
+           {
+               FileStream *File = (FileStream *) TOS;
+               ucell_t SizeHi = (ucell_t) M_POP;
+               ucell_t SizeLo = (ucell_t) M_POP;
+               TOS = ( UdIsUint64( SizeLo, SizeHi )
+                       ? sdResizeFile( File, UdToUint64( SizeLo, SizeHi ))
+                       : THROW_RESIZE_FILE );
+           }
+           endcase;
+

         case ID_FILL: /* ( caddr num charval -- ) */
             {
                 register char *DstPtr;
         case ID_FILL: /* ( caddr num charval -- ) */
             {
                 register char *DstPtr;