Return to paths.fs CVS log

Up to [gforth] / gforth / kernel

Annotation of gforth/kernel/paths.fs, revision 1.1

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:
        !            50: open-path-file ( adr len path -- fd adr len )
        !            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: 
        !            84: : path+                name rot also-path ;
        !            85: : fpath+       fpath path+ ;
        !            86: 
        !            87: : path=                name 2dup bounds ?DO i c@ '| = IF 0 i c! THEN LOOP
        !            88:                        rot only-path ;
        !            89: : fpath=       fpath path= ;
        !            90: 
        !            91: : path>counted  cell+ dup cell+ swap @ ;
        !            92: 
        !            93: : next-path ( adr len -- adr2 len2 )
        !            94:   2dup 0 scan
        !            95:   dup 0= IF     2drop 0 -rot 0 -rot EXIT THEN
        !            96:   >r 1+ -rot r@ 1- -rot
        !            97:   r> - ;
        !            98: 
        !            99: : privous-path ( path^ -- )
        !           100:   dup path>counted
        !           101:   BEGIN tuck dup WHILE repeat ;
        !           102: 
        !           103: : .path
        !           104:   path>counted
        !           105:   BEGIN next-path dup WHILE type space REPEAT 2drop 2drop ;
        !           106: 
        !           107: : .fpath fpath .path ;
        !           108: 
        !           109: : absolut-path? ( addr u -- flag ) \ gforth
        !           110:     \G a path is absolute, if it starts with a / or a ~ (~ expansion),
        !           111:     \G or if it is in the form ./* or ../*, extended regexp: ^[/~]|./|../
        !           112:     \G Pathes simply containing a / are not absolute!
        !           113:     2dup 2 u> swap 1+ c@ ': = and >r \ dos absoulte: c:/....
        !           114:     over c@ '/ = >r
        !           115:     over c@ '~ = >r
        !           116:     2dup 2 min S" ./" compare 0= >r
        !           117:          3 min S" ../" compare 0=
        !           118:     r> r> r> r> or or or or ;
        !           119: 
        !           120: Create ofile 0 c, 255 chars allot
        !           121: Create tfile 0 c, 255 chars allot
        !           122: 
        !           123: : pathsep? dup [char] / = swap [char] \ = or ;
        !           124: 
        !           125: : need/   ofile dup c@ + c@ pathsep? 0= IF s" /" ofile +place THEN ;
        !           126: 
        !           127: : check-path ( adr1 len1 adr2 len2 -- fd 0 | 0 <>0 )
        !           128:   0 ofile ! >r >r ofile place need/
        !           129:   r> r> ofile +place
        !           130:   ofile count r/o open-file ;
        !           131: 
        !           132: : expandtopic
        !           133:   ofile count 2 min s" ~+" compare 0=
        !           134:   IF   ofile count 2 /string tfile place
        !           135:        0 ofile c! sourcefilename onlypath ofile place need/
        !           136:        tfile count ofile +place
        !           137:   THEN ;
        !           138:        
        !           139: : onlypath ( adr len -- adr len2 )
        !           140:   BEGIN dup WHILE 1-
        !           141:         2dup + c@ pathsep? IF EXIT THEN
        !           142:   REPEAT ;
        !           143: 
        !           144: : open-path-file ( adr len path -- fd adr1 len2 )
        !           145:   >r
        !           146:   2dup absolut-path?
        !           147:   IF    rdrop
        !           148:         ofile place expandtopic ofile count r/o open-file throw
        !           149:         ofile count EXIT
        !           150:   ELSE  r> path>counted
        !           151:         BEGIN  next-path dup
        !           152:         WHILE  5 pick 5 pick check-path
        !           153:         0= IF >r 2drop 2drop r> ofile count EXIT ELSE drop THEN
        !           154:   REPEAT
        !           155:         2drop 2drop 2drop -&38 throw
        !           156:   THEN ;
        !           157: 
        !           158: : open-fpath-file fpath open-path-file ;