| | 1 | \ READ-LINE and WRITE-LINE |
| | 2 | \ |
| | 3 | \ This code is part of pForth. |
| | 4 | \ |
| | 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. |
| | 13 | |
| | 14 | private{ |
| | 15 | |
| | 16 | 10 constant \N |
| | 17 | 13 constant \R |
| | 18 | |
| | 19 | \ Unread one char from file FILEID. |
| | 20 | : UNREAD { fileid -- ior } |
| | 21 | fileid file-position ( ud ior ) |
| | 22 | ?dup |
| | 23 | IF nip nip \ IO error |
| | 24 | ELSE 1 s>d d- fileid reposition-file |
| | 25 | THEN |
| | 26 | ; |
| | 27 | |
| | 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 ) |
| | 33 | ?dup |
| | 34 | IF \ Read error? |
| | 35 | nip |
| | 36 | ELSE ( u ) |
| | 37 | 0= |
| | 38 | IF \ End of file? |
| | 39 | 0 |
| | 40 | ELSE |
| | 41 | c-addr c@ \n = ( is-it-a-\n? ) |
| | 42 | IF 0 |
| | 43 | ELSE fileid unread |
| | 44 | THEN |
| | 45 | THEN |
| | 46 | THEN |
| | 47 | ; |
| | 48 | |
| | 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 ; |
| | 52 | |
| | 53 | \ Standard throw code |
| | 54 | \ See: http://lars.nocrew.org/forth2012/exception.html#table:throw |
| | 55 | -72 constant THROW_RENAME_FILE |
| | 56 | |
| | 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 ) |
| | 61 | 0 2r> + c! ( ) |
| | 62 | ; |
| | 63 | |
| | 64 | }private |
| | 65 | |
| | 66 | \ This treats \n, \r\n, and \r as line terminator. Reading is done |
| | 67 | \ one char at a time with READ-FILE hence READ-FILE should probably do |
| | 68 | \ some form of buffering for good efficiency. |
| | 69 | : READ-LINE ( c-addr u1 fileid -- u2 flag ior ) |
| | 70 | { a u f } |
| | 71 | u 0 ?DO |
| | 72 | a i chars + 1 f read-file ( u ior' ) |
| | 73 | ?dup IF nip i false rot UNLOOP EXIT THEN \ Read error? ( u ) |
| | 74 | 0= IF i i 0<> 0 UNLOOP EXIT THEN \ End of file? ( ) |
| | 75 | a i chars + c@ |
| | 76 | CASE |
| | 77 | \n OF i true 0 UNLOOP EXIT ENDOF |
| | 78 | \r OF |
| | 79 | \ Detect \r\n |
| | 80 | a i chars + f skip-\n ( ior ) |
| | 81 | ?dup IF i false rot UNLOOP EXIT THEN \ IO Error? ( ) |
| | 82 | i true 0 UNLOOP EXIT |
| | 83 | ENDOF |
| | 84 | ENDCASE |
| | 85 | LOOP |
| | 86 | \ Line doesn't fit in buffer |
| | 87 | u true 0 |
| | 88 | ; |
| | 89 | |
| | 90 | : WRITE-LINE ( c-addr u fileid -- ior ) |
| | 91 | { f } |
| | 92 | f write-file ( ior ) |
| | 93 | ?dup |
| | 94 | IF \ IO error |
| | 95 | ELSE line-terminator f write-file |
| | 96 | THEN |
| | 97 | ; |
| | 98 | |
| | 99 | : RENAME-FILE ( c-addr1 u1 c-addr2 u2 -- ior ) |
| | 100 | { a1 u1 a2 u2 | new } |
| | 101 | \ Convert the file-names to C-strings by copying them after HERE. |
| | 102 | a1 u1 here place-cstr |
| | 103 | here u1 1+ chars + to new |
| | 104 | a2 u2 new place-cstr |
| | 105 | here new (rename-file) 0= |
| | 106 | IF 0 |
| | 107 | ELSE throw_rename_file |
| | 108 | THEN |
| | 109 | ; |
| | 110 | |
| | 111 | privatize |
projects / pforth / blame_incremental