\ 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
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
}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.
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
T{ BUF #CHARS @ LINE1 S= -> TRUE }T
T{ FID1 @ CLOSE-FILE -> 0 }T
+\ Test with buffer shorter than line.
+T{ FN1 R/O OPEN-FILE SWAP FID1 ! -> 0 }T
+T{ FID1 @ FILE-POSITION -> 0. 0 }T
+T{ BUF 0 FID1 @ READ-LINE ROT DUP #CHARS ! -> TRUE 0 0 }T
+T{ BUF 3 FID1 @ READ-LINE ROT DUP #CHARS ! -> TRUE 0 3 }T
+T{ BUF #CHARS @ LINE1 DROP 3 S= -> TRUE }T
+T{ BUF 100 FID1 @ READ-LINE ROT DUP #CHARS ! -> TRUE 0 LINE1 NIP 3 - }T
+T{ BUF #CHARS @ LINE1 3 /STRING S= -> TRUE }T
+T{ FID1 @ CLOSE-FILE -> 0 }T
+
+\ Test with buffer exactly as long as the line.
+T{ FN1 R/O OPEN-FILE SWAP FID1 ! -> 0 }T
+T{ FID1 @ FILE-POSITION -> 0. 0 }T
+T{ BUF LINE1 NIP FID1 @ READ-LINE ROT DUP #CHARS ! -> TRUE 0 LINE1 NIP }T
+T{ BUF #CHARS @ LINE1 S= -> TRUE }T
+T{ FID1 @ CLOSE-FILE -> 0 }T
+
\ ----------------------------------------------------------------------------
TESTING S" in interpretation mode (compile mode tested in Core tests)