/tests/inputs/issues/183/file.fth
https://github.com/AlDanial/cloc · Forth · 161 lines · 137 code · 16 blank · 8 comment · 5 complexity · c1a8bf9fb21814b1cb62712d75b370be MD5 · raw file
- \ https://github.com/philburk/pforth/fth/file.fth
- \ READ-LINE and WRITE-LINE
- \
- \ 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
- \ Unread one char from file FILEID.
- : UNREAD { fileid -- ior }
- fileid file-position ( ud ior )
- ?dup
- IF nip nip \ IO error
- 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 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.
- create (LINE-TERMINATOR) \n c,
- : LINE-TERMINATOR ( -- c-addr u ) (line-terminator) 1 ;
- \ 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
- \ 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 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
- ;
- : 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
- ;
- \ A limit used to perform a sanity check on the size argument for
- \ RESIZE-FILE.
- 2variable RESIZE-FILE-LIMIT
- 10000000 0 resize-file-limit 2! \ 10MB is somewhat arbitrarily chosen
- : RESIZE-FILE ( ud fileid -- ior )
- -rot 2dup resize-file-limit 2@ d> ( fileid ud big? )
- IF
- ." Argument (" 0 d.r ." ) is larger then RESIZE-FILE-LIMIT." cr
- ." (You can increase RESIZE-FILE-LIMIT with 2!)" cr
- abort
- ELSE
- rot (resize-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 -- 0 ior )
- r/o bin open-file ( fileid ior1 )
- ?dup
- IF nip 0 swap ( 0 ior1 )
- ELSE close-file 0 swap ( 0 ior2 )
- THEN
- ;
- privatize