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jwilke's changes:
Moved many files to other directories
renamed many files
other changes unknown to me.

    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 ;