X-Git-Url: http://git.subgeniuskitty.com/pforth/.git/blobdiff_plain/aad4537d9f90c2fd1b648f13a041ba1c7439b7c4..8d2c2052594284dc08a548589d63b6bcaf28f653:/fth/file.fth

diff --git a/fth/file.fth b/fth/file.fth
index c55de78..0017942 100644
--- a/fth/file.fth
+++ b/fth/file.fth
@@ -1,29 +1,35 @@
 \ READ-LINE and WRITE-LINE
 \
-\ This file is in the public domain.
+\ This code is part of pForth.
 \
+\ The pForth software code is dedicated to the public domain,
+\ and any third party may reproduce, distribute and modify
+\ the pForth software code or any derivative works thereof
+\ without any compensation or license.  The pForth software
+\ code is provided on an "as is" basis without any warranty
+\ of any kind, including, without limitation, the implied
+\ warranties of merchantability and fitness for a particular
+\ purpose and their equivalents under the laws of any jurisdiction.
 
 private{
 
-10 constant \n
-13 constant \r
+10 constant \N
+13 constant \R
 
 \ Unread one char from file FILEID.
-: UNREAD ( fileid -- ior )
-    { f }
-    f file-position          ( ud ior )
+: UNREAD { fileid -- ior }
+    fileid file-position          ( ud ior )
     ?dup
     IF   nip nip \ IO error
-    ELSE 1 s>d d- f reposition-file
+    ELSE 1 s>d d- fileid reposition-file
     THEN
 ;
 
 \ Read the next available char from file FILEID and if it is a \n then
 \ skip it; otherwise unread it.  IOR is non-zero if an error occured.
-\ C-ADDR is a buffer that can hold at least on char.
-: SKIP-\n ( c-addr fileid -- ior )
-    { a f }
-    a 1 f read-file               ( u ior )
+\ C-ADDR is a buffer that can hold at least one char.
+: SKIP-\N { c-addr fileid -- ior }
+    c-addr 1 fileid read-file     ( u ior )
     ?dup
     IF \ Read error?
         nip
@@ -32,9 +38,9 @@ private{
         IF \ End of file?
             0
         ELSE
-            a c@ \n =             ( is-it-a-\n? )
+            c-addr c@ \n =        ( is-it-a-\n? )
             IF   0
-            ELSE f unread
+            ELSE fileid unread
             THEN
         THEN
     THEN
@@ -44,8 +50,27 @@ private{
 create (LINE-TERMINATOR) \n c,
 : LINE-TERMINATOR ( -- c-addr u ) (line-terminator) 1 ;
 
-}private
+\ Standard throw code
+\ See: http://lars.nocrew.org/forth2012/exception.html#table:throw
+-72 constant THROW_RENAME_FILE
+
+\ Copy the string C-ADDR/U1 to C-ADDR2 and append a NUL.
+: PLACE-CSTR  ( c-addr1 u1 c-addr2 -- )
+    2dup 2>r          ( c-addr1 u1 c-addr2 )  ( r: u1 c-addr2 )
+    swap cmove        ( ) ( r: u1 c-addr2 )
+    0 2r> + c!        ( )
+;
 
+: MULTI-LINE-COMMENT ( "comment<rparen>" -- )
+    BEGIN
+        >in @ ')' parse         ( >in c-addr len )
+        nip + >in @ =           ( delimiter-not-found? )
+    WHILE                       ( )
+        refill 0= IF EXIT THEN  ( )
+    REPEAT
+;
+
+}private
 
 \ This treats \n, \r\n, and \r as line terminator.  Reading is done
 \ one char at a time with READ-FILE hence READ-FILE should probably do
@@ -55,13 +80,13 @@ create (LINE-TERMINATOR) \n c,
     u 0 ?DO
         a i chars + 1 f read-file                                  ( u ior' )
         ?dup IF nip i false rot UNLOOP EXIT THEN \ Read error?     ( u )
-        0= IF i i 0> 0 UNLOOP EXIT THEN          \ End of file?    ( )
+        0= IF i i 0<> 0 UNLOOP EXIT THEN         \ End of file?    ( )
         a i chars + c@
         CASE
             \n OF i true 0 UNLOOP EXIT ENDOF
             \r OF
                 \ Detect \r\n
-                a i 1+ chars + f skip-\n                           ( ior )
+                a i chars + f skip-\n                              ( ior )
                 ?dup IF i false rot UNLOOP EXIT THEN \ IO Error?   ( )
                 i true 0 UNLOOP EXIT
 	    ENDOF
@@ -80,4 +105,40 @@ create (LINE-TERMINATOR) \n c,
     THEN
 ;
 
+: RENAME-FILE ( c-addr1 u1 c-addr2 u2 -- ior )
+    { a1 u1 a2 u2 | new }
+    \ Convert the file-names to C-strings by copying them after HERE.
+    a1 u1 here place-cstr
+    here u1 1+ chars + to new
+    a2 u2 new place-cstr
+    here new (rename-file) 0=
+    IF 0
+    ELSE throw_rename_file
+    THEN
+;
+
+: (  ( "comment<rparen>"  -- )
+    source-id
+    CASE
+        -1 OF postpone ( ENDOF
+        0  OF postpone ( ENDOF
+        \ for input from files
+        multi-line-comment
+    ENDCASE
+; immediate
+
+\ We basically try to open the file in read-only mode.  That seems to
+\ be the best that we can do with ANSI C.  If we ever want to do
+\ something more sophisticated, like calling access(2), we must create
+\ a proper primitive.  (OTOH, portable programs can't assume much
+\ about FILE-STATUS and non-portable programs could create a custom
+\ function for access(2).)
+: FILE-STATUS ( c-addr u -- x ior )
+    r/o bin open-file           ( fileid ior1 )
+    ?dup
+    IF                          ( fileid ior1 )
+    ELSE close-file 0 swap      ( 0 ior2 )
+    THEN
+;
+
 privatize