1 \ READ-LINE and WRITE-LINE
3 \ This code is part of pForth.
5 \ The pForth software code is dedicated to the public domain,
6 \ and any third party may reproduce, distribute and modify
7 \ the pForth software code or any derivative works thereof
8 \ without any compensation or license. The pForth software
9 \ code is provided on an "as is" basis without any warranty
10 \ of any kind, including, without limitation, the implied
11 \ warranties of merchantability and fitness for a particular
12 \ purpose and their equivalents under the laws of any jurisdiction.
19 \ Unread one char from file FILEID.
20 : UNREAD { fileid -- ior }
21 fileid file-position ( ud ior )
24 ELSE 1 s>d d- fileid reposition-file
28 \ Read the next available char from file FILEID and if it is a \n then
29 \ skip it; otherwise unread it. IOR is non-zero if an error occured.
30 \ C-ADDR is a buffer that can hold at least one char.
31 : SKIP-\N { c-addr fileid -- ior }
32 c-addr 1 fileid read-file ( u ior )
41 c-addr c@ \n = ( is-it-a-\n? )
49 \ This is just s\" \n" but s\" isn't yet available.
50 create (LINE-TERMINATOR) \n c,
51 : LINE-TERMINATOR ( -- c-addr u ) (line-terminator) 1 ;
54 \ See: http://lars.nocrew.org/forth2012/exception.html#table:throw
55 -72 constant THROW_RENAME_FILE
57 \ Copy the string C-ADDR/U1 to C-ADDR2 and append a NUL.
58 : PLACE-CSTR ( c-addr1 u1 c-addr2 -- )
59 2dup 2>r ( c-addr1 u1 c-addr2 ) ( r: u1 c-addr2 )
60 swap cmove ( ) ( r: u1 c-addr2 )
64 : MULTI-LINE-COMMENT ( "comment<rparen>" -- )
66 >in @ ')' parse ( >in c-addr len )
67 nip + >in @ = ( delimiter-not-found? )
69 refill 0= IF EXIT THEN ( )
75 \ This treats \n, \r\n, and \r as line terminator. Reading is done
76 \ one char at a time with READ-FILE hence READ-FILE should probably do
77 \ some form of buffering for good efficiency.
78 : READ-LINE ( c-addr u1 fileid -- u2 flag ior )
81 a i chars + 1 f read-file ( u ior' )
82 ?dup IF nip i false rot UNLOOP EXIT THEN \ Read error? ( u )
83 0= IF i i 0<> 0 UNLOOP EXIT THEN \ End of file? ( )
86 \n OF i true 0 UNLOOP EXIT ENDOF
89 a i chars + f skip-\n ( ior )
90 ?dup IF i false rot UNLOOP EXIT THEN \ IO Error? ( )
95 \ Line doesn't fit in buffer
99 : WRITE-LINE ( c-addr u fileid -- ior )
104 ELSE line-terminator f write-file
108 : RENAME-FILE ( c-addr1 u1 c-addr2 u2 -- ior )
109 { a1 u1 a2 u2 | new }
110 \ Convert the file-names to C-strings by copying them after HERE.
111 a1 u1 here place-cstr
112 here u1 1+ chars + to new
114 here new (rename-file) 0=
116 ELSE throw_rename_file
120 : ( ( "comment<rparen>" -- )
123 -1 OF postpone ( ENDOF
124 0 OF postpone ( ENDOF
125 \ for input from files
130 \ We basically try to open the file in read-only mode. That seems to
131 \ be the best that we can do with ANSI C. If we ever want to do
132 \ something more sophisticated, like calling access(2), we must create
133 \ a proper primitive. (OTOH, portable programs can't assume much
134 \ about FILE-STATUS and non-portable programs could create a custom
135 \ function for access(2).)
136 : FILE-STATUS ( c-addr u -- 0 ior )
137 r/o bin open-file ( fileid ior1 )
139 IF nip 0 swap ( 0 ior1 )
140 ELSE close-file 0 swap ( 0 ior2 )