1: \ paths.fs path file handling 03may97jaw
2:
3: \ Copyright (C) 1995,1996,1997,1998,2000,2003 Free Software Foundation, Inc.
4:
5: \ This file is part of Gforth.
6:
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
9: \ as published by the Free Software Foundation; either version 2
10: \ of the License, or (at your option) any later version.
11:
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
16:
17: \ You should have received a copy of the GNU General Public License
18: \ along with this program; if not, write to the Free Software
19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
20:
21: \ -Changing the search-path:
22: \ fpath+ <path> adds a directory to the searchpath
23: \ fpath= <path>|<path> makes complete now searchpath
24: \ seperator is |
25: \ .fpath displays the search path
26: \ remark I:
27: \ a ./ in the beginning of filename is expanded to the directory the
28: \ current file comes from. ./ can also be included in the search-path!
29: \ ~+/ loads from the current working directory
30:
31: \ remark II:
32: \ if there is no sufficient space for the search path increase it!
33:
34:
35: \ -Creating custom paths:
36:
37: \ It is possible to use the search mechanism on yourself.
38:
39: \ Make a buffer for the path:
40: \ create mypath 100 path,
41: \ mypath path+
42: \ mypath path=
43: \ mypath .path
44:
45: \ do a open with the search path:
46: \ open-path-file ( adr len path -- fd adr len ior )
47: \ the file is opened read-only; if the file is not found an error is generated
48:
49: \ questions to: wilke@jwdt.com
50:
51: : path-allot ( umax -- )
52: \G @code{Allot} a path with @i{umax} characters capacity, initially empty.
53: chars dup , 0 , allot ;
54:
55: [IFUNDEF] +place
56: : +place ( adr len adr )
57: 2dup >r >r
58: dup c@ char+ + swap move
59: r> r> dup c@ rot + swap c! ;
60: [THEN]
61:
62: [IFUNDEF] place
63: : place ( c-addr1 u c-addr2 )
64: 2dup c! char+ swap move ;
65: [THEN]
66:
67: \ create sourcepath 1024 chars , 0 , 1024 chars allot \ !! make this dynamic
68: 0 avalue fpath ( -- path-addr ) \ gforth
69:
70: : os-cold ( -- )
71: 1024 chars dup 2 cells + allocate throw to fpath
72: 0 swap fpath 2!
73: pathstring 2@ fpath only-path
74: init-included-files ;
75:
76: \ The path Gforth uses for @code{included} and friends.
77:
78: : also-path ( c-addr len path-addr -- ) \ gforth
79: \G add the directory @i{c-addr len} to @i{path-addr}.
80: >r
81: \ len check
82: r@ cell+ @ over + r@ @ u> ABORT" path buffer too small!"
83: \ copy into
84: tuck r@ cell+ dup @ cell+ + swap cmove
85: \ make delimiter
86: 0 r@ cell+ dup @ cell+ + 2 pick + c! 1 + r> cell+ +!
87: ;
88:
89: : clear-path ( path-addr -- ) \ gforth
90: \G Set the path @i{path-addr} to empty.
91: 0 swap cell+ ! ;
92:
93: : only-path ( adr len path^ -- )
94: dup clear-path also-path ;
95:
96: : path+ ( path-addr "dir" -- ) \ gforth
97: \G Add the directory @var{dir} to the search path @var{path-addr}.
98: name rot also-path ;
99:
100: : fpath+ ( "dir" ) \ gforth
101: \G Add directory @var{dir} to the Forth search path.
102: fpath path+ ;
103:
104: : path= ( path-addr "dir1|dir2|dir3" ) \ gforth
105: \G Make a complete new search path; the path separator is |.
106: name 2dup bounds ?DO i c@ '| = IF 0 i c! THEN LOOP
107: rot only-path ;
108:
109: : fpath= ( "dir1|dir2|dir3" ) \ gforth
110: \G Make a complete new Forth search path; the path separator is |.
111: fpath path= ;
112:
113: : path>counted cell+ dup cell+ swap @ ;
114:
115: : next-path ( adr len -- adr2 len2 )
116: 2dup 0 scan
117: dup 0= IF 2drop 0 -rot 0 -rot EXIT THEN
118: >r 1+ -rot r@ 1- -rot
119: r> - ;
120:
121: : previous-path ( path^ -- )
122: \ !! "fpath previous-path" doesn't work
123: dup path>counted
124: BEGIN tuck dup WHILE repeat ;
125:
126: : .path ( path-addr -- ) \ gforth
127: \G Display the contents of the search path @var{path-addr}.
128: path>counted
129: BEGIN next-path dup WHILE type space REPEAT 2drop 2drop ;
130:
131: : .fpath ( -- ) \ gforth
132: \G Display the contents of the Forth search path.
133: fpath .path ;
134:
135: : absolut-path? ( addr u -- flag ) \ gforth
136: \G A path is absolute if it starts with a / or a ~ (~ expansion),
137: \G or if it is in the form ./*, extended regexp: ^[/~]|./, or if
138: \G it has a colon as second character ("C:..."). Paths simply
139: \G containing a / are not absolute!
140: 2dup 2 u> swap 1+ c@ ': = and >r \ dos absoulte: c:/....
141: over c@ '/ = >r
142: over c@ '~ = >r
143: \ 2dup S" ../" string-prefix? r> or >r \ not catered for in expandtopic
144: S" ./" string-prefix?
145: r> r> r> or or or ;
146:
147: Create ofile 0 c, 255 chars allot
148: Create tfile 0 c, 255 chars allot
149:
150: : pathsep? dup [char] / = swap [char] \ = or ;
151:
152: : need/ ofile dup c@ + c@ pathsep? 0= IF s" /" ofile +place THEN ;
153:
154: : extractpath ( adr len -- adr len2 )
155: BEGIN dup WHILE 1-
156: 2dup + c@ pathsep? IF EXIT THEN
157: REPEAT ;
158:
159: : remove~+ ( -- )
160: ofile count s" ~+/" string-prefix?
161: IF
162: ofile count 3 /string ofile place
163: THEN ;
164:
165: : expandtopic ( -- ) \ stack effect correct? - anton
166: \ expands "./" into an absolute name
167: ofile count s" ./" string-prefix?
168: IF
169: ofile count 1 /string tfile place
170: 0 ofile c! sourcefilename extractpath ofile place
171: \ care of / only if there is a directory
172: ofile c@ IF need/ THEN
173: tfile count over c@ pathsep? IF 1 /string THEN
174: ofile +place
175: THEN ;
176:
177: : compact.. ( adr len -- adr2 len2 )
178: \ deletes phrases like "xy/.." out of our directory name 2dec97jaw
179: over swap
180: BEGIN dup WHILE
181: dup >r '/ scan 2dup s" /../" string-prefix?
182: IF
183: dup r> - >r 4 /string over r> + 4 -
184: swap 2dup + >r move dup r> over -
185: ELSE
186: rdrop dup 1 min /string
187: THEN
188: REPEAT drop over - ;
189:
190: : reworkdir ( -- )
191: remove~+
192: ofile count compact..
193: nip ofile c! ;
194:
195: : open-ofile ( -- fid ior )
196: \G opens the file whose name is in ofile
197: expandtopic reworkdir
198: ofile count r/o open-file ;
199:
200: : check-path ( adr1 len1 adr2 len2 -- fd 0 | 0 <>0 )
201: 0 ofile ! >r >r ofile place need/
202: r> r> ofile +place
203: open-ofile ;
204:
205: \ !! allow arbitrary FAMs, not just R/O
206: : open-path-file ( addr1 u1 path-addr -- wfileid addr2 u2 0 | ior ) \ gforth
207: \G Look in path @var{path-addr} for the file specified by @var{addr1 u1}.
208: \G If found, the resulting path and and (read-only) open file descriptor
209: \G are returned. If the file is not found, @var{ior} is non-zero.
210: >r
211: 2dup absolut-path?
212: IF rdrop
213: ofile place open-ofile
214: dup 0= IF >r ofile count r> THEN EXIT
215: ELSE r> path>counted
216: BEGIN next-path dup
217: WHILE 5 pick 5 pick check-path
218: 0= IF >r 2drop 2drop r> ofile count 0 EXIT ELSE drop THEN
219: REPEAT
220: 2drop 2drop 2drop -&37
221: THEN ;
222:
223: : open-fpath-file ( addr1 u1 -- wfileid addr2 u2 0 | ior ) \ gforth
224: \G Look in the Forth search path for the file specified by @var{addr1 u1}.
225: \G If found, the resulting path and an open file descriptor
226: \G are returned. If the file is not found, @var{ior} is non-zero.
227: fpath open-path-file ;
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