\ paths.fs path file handling 03may97jaw
\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation; either version 2
\ of the License, or (at your option) any later version.
\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\ GNU General Public License for more details.
\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
\ -Changing the search-path:
\ fpath+ <path> adds a directory to the searchpath
\ fpath= <path>|<path> makes complete now searchpath
\ seperator is |
\ .fpath displays the search path
\ remark I:
\ a ./ in the beginning of filename is expanded to the directory the
\ current file comes from. ./ can also be included in the search-path!
\ ~+/ loads from the current working directory
\ remark II:
\ if there is no sufficient space for the search path increase it!
\ -Creating custom paths:
\ It is possible to use the search mechanism on yourself.
\ Make a buffer for the path:
\ create mypath 100 chars , \ maximum length (is checked)
\ 0 , \ real len
\ 100 chars allot \ space for path
\ use the same functions as above with:
\ mypath path+
\ mypath path=
\ mypath .path
\ do a open with the search path:
\ open-path-file ( adr len path -- fd adr len ior )
\ the file is opened read-only; if the file is not found an error is generated
\ questions to: wilke@jwdt.com
[IFUNDEF] +place
: +place ( adr len adr )
2dup >r >r
dup c@ char+ + swap move
r> r> dup c@ rot + swap c! ;
[THEN]
[IFUNDEF] place
: place ( c-addr1 u c-addr2 )
2dup c! char+ swap move ;
[THEN]
create sourcepath 1024 chars , 0 , 1024 chars allot \ !! make this dynamic
sourcepath avalue fpath
: also-path ( adr len path^ -- )
>r
\ len check
r@ cell+ @ over + r@ @ u> ABORT" path buffer too small!"
\ copy into
tuck r@ cell+ dup @ cell+ + swap cmove
\ make delimiter
0 r@ cell+ dup @ cell+ + 2 pick + c! 1 + r> cell+ +!
;
: only-path ( adr len path^ -- )
dup 0 swap cell+ ! also-path ;
: path+ ( path-addr "dir" -- ) \ gforth
\G Add the directory @var{dir} to the search path @var{path-addr}.
name rot also-path ;
: fpath+ ( "dir" ) \ gforth
\G Add directory @var{dir} to the Forth search path.
fpath path+ ;
: path= ( path-addr "dir1|dir2|dir3" ) \ gforth
\G Make a complete new search path; the path separator is |.
name 2dup bounds ?DO i c@ '| = IF 0 i c! THEN LOOP
rot only-path ;
: fpath= ( "dir1|dir2|dir3" ) \ gforth
\G Make a complete new Forth search path; the path separator is |.
fpath path= ;
: path>counted cell+ dup cell+ swap @ ;
: next-path ( adr len -- adr2 len2 )
2dup 0 scan
dup 0= IF 2drop 0 -rot 0 -rot EXIT THEN
>r 1+ -rot r@ 1- -rot
r> - ;
: previous-path ( path^ -- )
dup path>counted
BEGIN tuck dup WHILE repeat ;
: .path ( path-addr -- ) \ gforth
\G Display the contents of the search path @var{path-addr}.
path>counted
BEGIN next-path dup WHILE type space REPEAT 2drop 2drop ;
: .fpath ( -- ) \ gforth
\G Display the contents of the Forth search path.
fpath .path ;
: absolut-path? ( addr u -- flag ) \ gforth
\G A path is absolute if it starts with a / or a ~ (~ expansion),
\G or if it is in the form ./*, extended regexp: ^[/~]|./, or if
\G it has a colon as second character ("C:..."). Paths simply
\G containing a / are not absolute!
2dup 2 u> swap 1+ c@ ': = and >r \ dos absoulte: c:/....
over c@ '/ = >r
over c@ '~ = >r
\ 2dup 3 min S" ../" compare 0= r> or >r \ not catered for in expandtopic
2 min S" ./" compare 0=
r> r> r> or or or ;
Create ofile 0 c, 255 chars allot
Create tfile 0 c, 255 chars allot
: pathsep? dup [char] / = swap [char] \ = or ;
: need/ ofile dup c@ + c@ pathsep? 0= IF s" /" ofile +place THEN ;
: extractpath ( adr len -- adr len2 )
BEGIN dup WHILE 1-
2dup + c@ pathsep? IF EXIT THEN
REPEAT ;
: remove~+ ( -- )
ofile count 3 min s" ~+/" compare 0=
IF
ofile count 3 /string ofile place
THEN ;
: expandtopic ( -- ) \ stack effect correct? - anton
\ expands "./" into an absolute name
ofile count 2 min s" ./" compare 0=
IF
ofile count 1 /string tfile place
0 ofile c! sourcefilename extractpath ofile place
\ care of / only if there is a directory
ofile c@ IF need/ THEN
tfile count over c@ pathsep? IF 1 /string THEN
ofile +place
THEN ;
: compact.. ( adr len -- adr2 len2 )
\ deletes phrases like "xy/.." out of our directory name 2dec97jaw
over >r -1 >r
BEGIN dup WHILE
over c@ pathsep?
IF r@ -1 =
IF r> drop dup >r
ELSE 2dup 1 /string
3 min s" ../" compare
0=
IF r@ over - ( diff )
2 pick swap - ( dest-adr )
>r 3 /string r> swap 2dup >r >r
move r> r>
ELSE r> drop dup >r
THEN
THEN
THEN
1 /string
REPEAT
r> drop
drop r> tuck - ;
: reworkdir ( -- )
remove~+
ofile count compact..
nip ofile c! ;
: open-ofile ( -- fid ior )
\G opens the file whose name is in ofile
expandtopic reworkdir
ofile count r/o open-file ;
: check-path ( adr1 len1 adr2 len2 -- fd 0 | 0 <>0 )
0 ofile ! >r >r ofile place need/
r> r> ofile +place
open-ofile ;
: open-path-file ( addr1 u1 path-addr -- wfileid addr2 u2 0 | ior ) \ gforth
\G Look in path @var{path-addr} for the file specified by @var{addr1 u1}.
\G If found, the resulting path and an open file descriptor
\G are returned. If the file is not found, @var{ior} is non-zero.
>r
2dup absolut-path?
IF rdrop
ofile place open-ofile
dup 0= IF >r ofile count r> THEN EXIT
ELSE r> path>counted
BEGIN next-path dup
WHILE 5 pick 5 pick check-path
0= IF >r 2drop 2drop r> ofile count 0 EXIT ELSE drop THEN
REPEAT
2drop 2drop 2drop -&38
THEN ;
: open-fpath-file ( addr1 u1 -- wfileid addr2 u2 0 | ior ) \ gforth
\G Look in the Forth search path for the file specified by @var{addr1 u1}.
\G If found, the resulting path and an open file descriptor
\G are returned. If the file is not found, @var{ior} is non-zero.
fpath open-path-file ;
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>