remove vestigial special-case code for input from 'terminal' (stdin)

startup.4th

@@ -2073,60 +2073,6 @@ FORTH DEFINITIONS
 : PRESERVED  ( i*x xt addr -- j*x )
    DUP @ >R >R CATCH 2R> ! RETHROW ;
 
-SYSTEM DEFINITIONS
-
-\ The size of this buffer will determine the maximum line length
-4096 CONSTANT TERMINAL-BUFFER-BYTES
-TERMINAL-BUFFER-BYTES BUFFER: TERMINAL-BUFFER
-
-\ If we read more than one line then these will refer to the rest of the data
-2VARIABLE TIB-LEFTOVER
-NULL 0 TIB-LEFTOVER 2!
-
-\ Placeholder for later support for input from files
-DEFER REFILL-FROM-FILE
-' FALSE IS REFILL-FROM-FILE
-
-FORTH DEFINITIONS
-
-\ Attempt to replace the parse area with the next line from the current source
-\ Return TRUE if the parse area was refilled, or FALSE otherwise
-\ REFILL always fails if the current source is a string (from EVALUATE)
-:FINALIZE REFILL  ( -- flag )
-   SOURCE-ID -1 = IF FALSE EXIT THEN
-   SOURCE-ID 0> IF REFILL-FROM-FILE EXIT THEN
-   \ Shift any leftover characters after the previous line to the start of the buffer
-   TIB-LEFTOVER 2@ TERMINAL-BUFFER SWAP DUP >R CMOVE
-   \ Look for the linefeed character which marks the end of the first line
-   R> 0 BEGIN
-      \ If at the end with room in the buffer, read more from the file descriptor
-      2DUP = IF
-         DUP TERMINAL-BUFFER-BYTES U< IF
-            STDIN OVER TERMINAL-BUFFER TERMINAL-BUFFER-BYTES ROT /STRING
-            ( S: length idx src-id buff buff-size )
-            SYS_READ SYSCALL3-RETRY DUP 0< IF EXCP-FILE-IO THROW THEN
-            ( S: length idx u-read )
-            \ Add the amount of data read to the length; index is unchanged
-            ROT + SWAP
-         THEN
-      THEN
-      \ At this point if index equals length then buffer is full or read returned 0
-      \ Either way, we won't be reading any more into the buffer
-      2DUP <>
-   WHILE
-      \ Check if the next character is a linefeed
-      1+ DUP 1- TERMINAL-BUFFER + C@ LF =
-   UNTIL
-   ( S: length idx )
-   \ idx is the next location after the linefeed, if found, or else equal to length
-   \ Save the rest, if any, for the next REFILL
-   TUCK - >R TERMINAL-BUFFER OVER + R> TIB-LEFTOVER 2!
-   ( S: idx )
-   \ The new input buffer is the first idx characters of the terminal buffer
-   TERMINAL-BUFFER OVER INPUT-BUFFER 2!
-   DUP IF 0 >IN ! THEN
-   0<> ;
-
 UTILITY DEFINITIONS
 
 \ Parse up to limit digits in the given base, appending them to u1 to produce u2.
@@ -2836,6 +2782,7 @@ SYSTEM DEFINITIONS
 STRUCT
    AA-NODE% FIELD FILE>NODE
    CELL%    FIELD FILE>FD
+   CELL%    FIELD FILE>FLAGS
    CELL%    FIELD FILE>BUFFER
    2CELL%   FIELD FILE>LEFTOVER
    2CELL%   FIELD FILE>POSITION
@@ -2875,6 +2822,7 @@ O_RDWR   CONSTANT R/W  ( -- fam )
    -ROT MAKE-CSTRING ▪ FILE% %ALLOCATE ▪ NULL
    LOCALS| fam name file open-how |
    open_how% %ALLOCA open-how!
+   fam file FILE>FLAGS !
    NULL file FILE>BUFFER !
    file CLEAR-LEFTOVER
    0# file FILE>POSITION 2!
@@ -2954,6 +2902,11 @@ UTILITY DEFINITIONS
    THEN
    RDROP ;
 
+: RAW-FILE-POSITION  ( fileid -- ud )
+   DUP FD>FILE DROP ▪ signed-long-long% %ALLOCA >R
+   0# SWAP ▪ R@ ▪ SEEK_CUR ▪ SYS__LLSEEK SYSCALL5-RETRY
+   0<> IF EXCP-FILE-IO THROW THEN ▪ R> 2@ SWAP ;
+
 FORTH DEFINITIONS
 
 : READ-FILE  ( c-addr u1 fileid -- u2 )
@@ -2984,6 +2937,17 @@ FORTH DEFINITIONS
 
 UTILITY DEFINITIONS
 
+: OPEN-FD  ( fd fam -- fileid )
+   FILE% %ALLOCATE
+   TUCK FILE>FLAGS !
+   NULL OVER FILE>BUFFER !
+   DUP CLEAR-LEFTOVER
+   DUP NULL 0 ROT FILE>SOURCE 2!
+   2DUP FILE>FD !
+   DUP FILES AA-INSERT
+   OVER [[ ' RAW-FILE-POSITION ]] CATCH IF DROP 0# THEN
+   ROT FILE>POSITION 2! ;
+
 : REFILL-FILE  ( fileid -- t=refilled )
    FD>FILE >R
    R@ ENSURE-SOURCE
@@ -2992,8 +2956,8 @@ UTILITY DEFINITIONS
 
 SYSTEM DEFINITIONS
 
-:FINALIZE REFILL-FROM-FILE  ( -- t=refilled )
+: REFILL-FROM-FILE  ( -- t=refilled )
-   SOURCE-ID DUP 0< "not a valid file source" ?FAIL
+   SOURCE-ID
    DUP [[ ' REFILL-FILE ]] CATCH ?DUP IF
       DUP EXCP-FILE-IO <> IF RETHROW THEN
       DROP 2DROP FALSE EXIT
@@ -3001,6 +2965,8 @@ SYSTEM DEFINITIONS
    DUP IF ▪ OVER FD>FILE FILE>SOURCE 2@ ▪ INPUT-BUFFER 2! ▪ 0 >IN ! ▪ THEN
    NIP ;
 
+{ SOURCE-ID 0>= IF REFILL-FROM-FILE ELSE DEFERS REFILL THEN } IS REFILL
+
 FORTH DEFINITIONS
 
 : WRITE-FILE  ( c-addr u fileid -- )
@@ -3045,6 +3011,10 @@ FORTH DEFINITIONS
 
 SYSTEM DEFINITIONS
 
+0 R/O OPEN-FD DROP
+1 W/O OPEN-FD DROP
+2 W/O OPEN-FD DROP
+
 {
    ONLY FORTH DEFINITIONS
    ARGC 2 U>= IF