\ 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 )
- ?dup
- IF \ Read error?
- nip
- ELSE ( u )
- 0=
- IF \ End of file?
- 0
- ELSE
- a c@ \n = ( is-it-a-\n? )
- IF 0
- ELSE f unread
- THEN
- THEN
- THEN
+\ 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
+ ELSE ( u )
+ 0=
+ IF \ End of file?
+ 0
+ ELSE
+ c-addr c@ \n = ( is-it-a-\n? )
+ IF 0
+ ELSE fileid unread
+ THEN
+ THEN
+ THEN
;
\ This is just s\" \n" but s\" isn't yet available.
}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
\ some form of buffering for good efficiency.
: READ-LINE ( c-addr u1 fileid -- u2 flag ior )
- { a u f }
- 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? ( )
- 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 )
- ?dup IF i false rot UNLOOP EXIT THEN \ IO Error? ( )
- i true 0 UNLOOP EXIT
- ENDOF
- ENDCASE
- LOOP
- \ Line doesn't fit in buffer
- u true 0
+ { a u f }
+ 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? ( )
+ a i chars + c@
+ CASE
+ \n OF i true 0 UNLOOP EXIT ENDOF
+ \r OF
+ \ Detect \r\n
+ a i chars + f skip-\n ( ior )
+ ?dup IF i false rot UNLOOP EXIT THEN \ IO Error? ( )
+ i true 0 UNLOOP EXIT
+ ENDOF
+ ENDCASE
+ LOOP
+ \ Line doesn't fit in buffer
+ u true 0
;
: WRITE-LINE ( c-addr u fileid -- ior )
- { f }
- f write-file ( ior )
- ?dup
- IF \ IO error
- ELSE line-terminator f write-file
- THEN
+ { f }
+ f write-file ( ior )
+ ?dup
+ IF \ IO error
+ ELSE line-terminator f write-file
+ THEN
;
privatize