Commit | Line | Data |
---|---|---|
593eb738 HE |
1 | \ READ-LINE and WRITE-LINE |
2 | \ | |
938d9dba | 3 | \ This code is part of pForth. |
593eb738 | 4 | \ |
938d9dba HE |
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. | |
593eb738 HE |
13 | |
14 | private{ | |
15 | ||
938d9dba HE |
16 | 10 constant \N |
17 | 13 constant \R | |
593eb738 HE |
18 | |
19 | \ Unread one char from file FILEID. | |
938d9dba HE |
20 | : UNREAD { fileid -- ior } |
21 | fileid file-position ( ud ior ) | |
593eb738 HE |
22 | ?dup |
23 | IF nip nip \ IO error | |
938d9dba | 24 | ELSE 1 s>d d- fileid reposition-file |
593eb738 HE |
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. | |
938d9dba HE |
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 ) | |
aad4537d HE |
33 | ?dup |
34 | IF \ Read error? | |
35 | nip | |
36 | ELSE ( u ) | |
37 | 0= | |
38 | IF \ End of file? | |
39 | 0 | |
40 | ELSE | |
938d9dba | 41 | c-addr c@ \n = ( is-it-a-\n? ) |
aad4537d | 42 | IF 0 |
938d9dba | 43 | ELSE fileid unread |
aad4537d HE |
44 | THEN |
45 | THEN | |
46 | THEN | |
593eb738 HE |
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 | }private | |
54 | ||
593eb738 HE |
55 | \ This treats \n, \r\n, and \r as line terminator. Reading is done |
56 | \ one char at a time with READ-FILE hence READ-FILE should probably do | |
57 | \ some form of buffering for good efficiency. | |
58 | : READ-LINE ( c-addr u1 fileid -- u2 flag ior ) | |
aad4537d HE |
59 | { a u f } |
60 | u 0 ?DO | |
61 | a i chars + 1 f read-file ( u ior' ) | |
62 | ?dup IF nip i false rot UNLOOP EXIT THEN \ Read error? ( u ) | |
938d9dba | 63 | 0= IF i i 0<> 0 UNLOOP EXIT THEN \ End of file? ( ) |
aad4537d HE |
64 | a i chars + c@ |
65 | CASE | |
66 | \n OF i true 0 UNLOOP EXIT ENDOF | |
67 | \r OF | |
68 | \ Detect \r\n | |
938d9dba | 69 | a i chars + f skip-\n ( ior ) |
aad4537d HE |
70 | ?dup IF i false rot UNLOOP EXIT THEN \ IO Error? ( ) |
71 | i true 0 UNLOOP EXIT | |
72 | ENDOF | |
73 | ENDCASE | |
74 | LOOP | |
75 | \ Line doesn't fit in buffer | |
76 | u true 0 | |
593eb738 HE |
77 | ; |
78 | ||
79 | : WRITE-LINE ( c-addr u fileid -- ior ) | |
aad4537d HE |
80 | { f } |
81 | f write-file ( ior ) | |
82 | ?dup | |
83 | IF \ IO error | |
84 | ELSE line-terminator f write-file | |
85 | THEN | |
593eb738 HE |
86 | ; |
87 | ||
88 | privatize |