Annotation of gforth/kernel/paths.fs, revision 1.3
1.1 anton 1: \ paths.fs path file handling 03may97jaw
2:
3: \ Copyright (C) 1995-1997 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., 675 Mass Ave, Cambridge, MA 02139, USA.
20:
21: 0 [IF]
22:
23: -Changing the search-path:
24: fpath+ <path> adds a directory to the searchpath
25: fpath= <path>|<path> makes complete now searchpath
26: seperator is |
27: .fpath displays the search path
28: remark I:
29: a ~+ in the beginning of filename is expanded to the directory the
30: current file comes from. ~+ can also be included in the search-path!
31:
32: remark II:
33: if there is no sufficient space for the search path increase it!
34:
35:
36: -Creating custom paths:
37:
38: It is possible to use the search mechanism on yourself.
39:
40: Make a buffer for the path:
41: create mypath 100 chars , \ maximum length (is checked)
42: 0 , \ real len
43: 100 chars allot \ space for path
44: use the same functions as above with:
45: mypath path+
46: mypath path=
47: mypath .path
48:
49: do a open with the search path:
1.3 ! pazsan 50: open-path-file ( adr len path -- fd adr len ior )
1.1 anton 51: the file is opened read-only; if the file is not found an error is generated
52:
53: \ questions to: wilke@jwdt.com
54: [THEN]
55:
56: [IFUNDEF] +place
57: : +place ( adr len adr )
58: 2dup >r >r
59: dup c@ char+ + swap move
60: r> r> dup c@ rot + swap c! ;
61: [THEN]
62:
63: [IFUNDEF] place
64: : place ( c-addr1 u c-addr2 )
65: 2dup c! char+ swap move ;
66: [THEN]
67:
68: create sourcepath 256 chars , 0 , 256 chars allot
69: sourcepath avalue fpath
70:
71: : also-path ( adr len path^ -- )
72: >r
73: \ len check
74: r@ cell+ @ over + r@ @ u> ABORT" path buffer too small!"
75: \ copy into
76: tuck r@ cell+ dup @ cell+ + swap cmove
77: \ make delemiter
78: 0 r@ cell+ dup @ cell+ + 2 pick + c! 1 + r> cell+ +!
79: ;
80:
81: : only-path ( adr len path^ -- )
82: dup 0 swap cell+ ! also-path ;
83:
1.2 jwilke 84: : path+ ( path-addr "dir" -- ) \ gforth
85: \G adds a directory to the search path path-addr
86: name rot also-path ;
87:
88: : fpath+ ( "dir" ) \ gforth
89: \G adds a directory to the forth search path
90: fpath path+ ;
91:
92: : path= ( path-addr "dir1|dir2|dir3" ) \ gforth
93: \G makes complete new searchpath, seperator is |
94: name 2dup bounds ?DO i c@ '| = IF 0 i c! THEN LOOP
95: rot only-path ;
96:
97: : fpath= ( "dir1|dir2|dir3" ) \ gforth
98: \G makes complete new searchpath, serpeator is |
99: fpath path= ;
1.1 anton 100:
101: : path>counted cell+ dup cell+ swap @ ;
102:
103: : next-path ( adr len -- adr2 len2 )
104: 2dup 0 scan
105: dup 0= IF 2drop 0 -rot 0 -rot EXIT THEN
106: >r 1+ -rot r@ 1- -rot
107: r> - ;
108:
109: : privous-path ( path^ -- )
110: dup path>counted
111: BEGIN tuck dup WHILE repeat ;
112:
1.2 jwilke 113: : .path ( path-addr -- ) \ gforth
114: \G displays the contents of the search path path-addr
1.1 anton 115: path>counted
116: BEGIN next-path dup WHILE type space REPEAT 2drop 2drop ;
117:
1.2 jwilke 118: : .fpath ( ) \ gforth
119: \G displays the contents of the forth search patch
120: fpath .path ;
1.1 anton 121:
122: : absolut-path? ( addr u -- flag ) \ gforth
123: \G a path is absolute, if it starts with a / or a ~ (~ expansion),
124: \G or if it is in the form ./* or ../*, extended regexp: ^[/~]|./|../
125: \G Pathes simply containing a / are not absolute!
126: 2dup 2 u> swap 1+ c@ ': = and >r \ dos absoulte: c:/....
127: over c@ '/ = >r
128: over c@ '~ = >r
129: 2dup 2 min S" ./" compare 0= >r
130: 3 min S" ../" compare 0=
131: r> r> r> r> or or or or ;
132:
133: Create ofile 0 c, 255 chars allot
134: Create tfile 0 c, 255 chars allot
135:
136: : pathsep? dup [char] / = swap [char] \ = or ;
137:
138: : need/ ofile dup c@ + c@ pathsep? 0= IF s" /" ofile +place THEN ;
139:
1.2 jwilke 140: : extractpath ( adr len -- adr len2 )
141: BEGIN dup WHILE 1-
142: 2dup + c@ pathsep? IF EXIT THEN
143: REPEAT ;
1.1 anton 144:
145: : expandtopic
146: ofile count 2 min s" ~+" compare 0=
147: IF ofile count 2 /string tfile place
1.2 jwilke 148: 0 ofile c! sourcefilename extractpath ofile place need/
1.3 ! pazsan 149: tfile count over c@ pathsep? IF 1 /string THEN
! 150: ofile +place
1.1 anton 151: THEN ;
152:
1.3 ! pazsan 153: : compact// ( adr len -- adr2 len2 )
! 154: \ deletes phrases like "//" out of our directory name 2dec97jaw
! 155: over >r
! 156: BEGIN dup WHILE
! 157: over c@ pathsep? over 1- 0<> and
! 158: IF over 1+ c@ pathsep?
! 159: IF 1- over 1+ swap move
! 160: THEN
! 161: THEN
! 162: 1 /string
! 163: REPEAT
! 164: drop r> tuck - ;
! 165:
! 166: : compact.. ( adr len -- adr2 len2 )
! 167: \ deletes phrases like "xy/.." out of our directory name 2dec97jaw
! 168: over >r -1 >r
! 169: BEGIN dup WHILE
! 170: over c@ pathsep?
! 171: IF r@ -1 =
! 172: IF r> drop dup >r
! 173: ELSE 2dup 1 /string
! 174: 3 min s" ../" compare
! 175: 0=
! 176: IF r@ over - ( diff )
! 177: 2 pick swap - ( dest-adr )
! 178: >r 3 /string r> swap 2dup >r >r
! 179: move r> r>
! 180: ELSE r> drop dup >r
! 181: THEN
! 182: THEN
! 183: THEN
! 184: 1 /string
! 185: REPEAT
! 186: r> drop
! 187: drop r> tuck - ;
! 188:
! 189: : reworkdir
! 190: expandtopic
! 191: ofile count compact// compact..
! 192: nip ofile c! ;
! 193:
1.2 jwilke 194: : check-path ( adr1 len1 adr2 len2 -- fd 0 | 0 <>0 )
195: 0 ofile ! >r >r ofile place need/
196: r> r> ofile +place
1.3 ! pazsan 197: reworkdir
1.2 jwilke 198: ofile count r/o open-file ;
1.1 anton 199:
1.2 jwilke 200: : open-path-file ( adr len path-addr -- fd adr1 len2 0 | ior ) \ gforth
201: \G looks in path path-addr for the file specified by adr len
202: \G when found the resulting path and an open file descriptor
203: \G is returned. If the file is not found ior is non zero
1.1 anton 204: >r
205: 2dup absolut-path?
206: IF rdrop
1.3 ! pazsan 207: ofile place reworkdir ofile count r/o open-file
! 208: dup 0= IF >r ofile count r> THEN EXIT
1.1 anton 209: ELSE r> path>counted
210: BEGIN next-path dup
211: WHILE 5 pick 5 pick check-path
1.2 jwilke 212: 0= IF >r 2drop 2drop r> ofile count 0 EXIT ELSE drop THEN
1.1 anton 213: REPEAT
1.2 jwilke 214: 2drop 2drop 2drop -&38
1.1 anton 215: THEN ;
216:
1.2 jwilke 217: : open-fpath-file ( adr len -- fd adr1 len2 0 | ior ) \ gforth
218: \G looks in the forth search path for the file specified by adr len
219: \G when found the resulting path and an open file descriptor
220: \G is returned. If the file is not found ior is non zero
221: fpath open-path-file ;
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