File:  [gforth] / gforth / kernel / paths.fs
Revision 1.8: download - view: text, annotated - select for diffs
Tue Dec 22 23:11:30 1998 UTC (23 years, 7 months ago) by anton
Branches: MAIN
CVS tags: v0-4-0, HEAD
fixed some bugs and problems

    1: \ paths.fs path file handling                                    03may97jaw
    2: 
    3: \ Copyright (C) 1995,1996,1997,1998 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: \ -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 chars , 	\ maximum length (is checked)
   41: \ 		0 ,		\ real len
   42: \ 		100 chars allot \ space for path
   43: \ use the same functions as above with:
   44: \ mypath path+ 
   45: \ mypath path=
   46: \ mypath .path
   47: 
   48: \ do a open with the search path:
   49: \ open-path-file ( adr len path -- fd adr len ior )
   50: \ the file is opened read-only; if the file is not found an error is generated
   51: 
   52: \ questions to: wilke@jwdt.com
   53: 
   54: [IFUNDEF] +place
   55: : +place ( adr len adr )
   56:         2dup >r >r
   57:         dup c@ char+ + swap move
   58:         r> r> dup c@ rot + swap c! ;
   59: [THEN]
   60: 
   61: [IFUNDEF] place
   62: : place ( c-addr1 u c-addr2 )
   63:         2dup c! char+ swap move ;
   64: [THEN]
   65: 
   66: create sourcepath 1024 chars , 0 , 1024 chars allot \ !! make this dynamic
   67: sourcepath avalue fpath
   68: 
   69: : also-path ( adr len path^ -- )
   70:   >r
   71:   \ len check
   72:   r@ cell+ @ over + r@ @ u> ABORT" path buffer too small!"
   73:   \ copy into
   74:   tuck r@ cell+ dup @ cell+ + swap cmove
   75:   \ make delemiter
   76:   0 r@ cell+ dup @ cell+ + 2 pick + c! 1 + r> cell+ +!
   77:   ;
   78: 
   79: : only-path ( adr len path^ -- )
   80:   dup 0 swap cell+ ! also-path ;
   81: 
   82: : path+ ( path-addr  "dir" -- ) \ gforth
   83: \G adds a directory to the search path path-addr
   84:   name rot also-path ;
   85: 
   86: : fpath+ ( "dir" ) \ gforth
   87: \G adds a directory to the forth search path
   88:   fpath path+ ;
   89: 
   90: : path= ( path-addr "dir1|dir2|dir3" ) \ gforth
   91: \G makes complete new searchpath, seperator is |
   92:   name 2dup bounds ?DO i c@ '| = IF 0 i c! THEN LOOP
   93:   rot only-path ;
   94: 
   95: : fpath= ( "dir1|dir2|dir3" ) \ gforth
   96: \G makes complete new searchpath, serpeator is |
   97:   fpath path= ;
   98: 
   99: : path>counted  cell+ dup cell+ swap @ ;
  100: 
  101: : next-path ( adr len -- adr2 len2 )
  102:   2dup 0 scan
  103:   dup 0= IF     2drop 0 -rot 0 -rot EXIT THEN
  104:   >r 1+ -rot r@ 1- -rot
  105:   r> - ;
  106: 
  107: : previous-path ( path^ -- )
  108:   dup path>counted
  109:   BEGIN tuck dup WHILE repeat ;
  110: 
  111: : .path ( path-addr -- ) \ gforth
  112: \G displays the contents of the search path path-addr
  113:   path>counted
  114:   BEGIN next-path dup WHILE type space REPEAT 2drop 2drop ;
  115: 
  116: : .fpath ( -- ) \ gforth
  117: \G displays the contents of the forth search patch
  118:   fpath .path ;
  119: 
  120: : absolut-path? ( addr u -- flag ) \ gforth
  121:     \G a path is absolute, if it starts with a / or a ~ (~ expansion),
  122:     \G or if it is in the form ./*, extended regexp: ^[/~]|./, or if
  123:     \G it has a colon as second character ("C:...").  Paths simply
  124:     \G containing a / are not absolute!
  125:     2dup 2 u> swap 1+ c@ ': = and >r \ dos absoulte: c:/....
  126:     over c@ '/ = >r
  127:     over c@ '~ = >r
  128:     \ 2dup 3 min S" ../" compare 0= r> or >r \ not catered for in expandtopic
  129:     2 min S" ./" compare 0=
  130:     r> r> r> or or or ;
  131: 
  132: Create ofile 0 c, 255 chars allot
  133: Create tfile 0 c, 255 chars allot
  134: 
  135: : pathsep? dup [char] / = swap [char] \ = or ;
  136: 
  137: : need/   ofile dup c@ + c@ pathsep? 0= IF s" /" ofile +place THEN ;
  138: 
  139: : extractpath ( adr len -- adr len2 )
  140:   BEGIN dup WHILE 1-
  141:         2dup + c@ pathsep? IF EXIT THEN
  142:   REPEAT ;
  143: 
  144: : remove~+ ( -- )
  145:     ofile count 3 min s" ~+/" compare 0=
  146:     IF
  147: 	ofile count 3 /string ofile place
  148:     THEN ;
  149: 
  150: : expandtopic ( -- ) \ stack effect correct? - anton
  151:     \ expands "./" into an absolute name
  152:     ofile count 2 min s" ./" compare 0=
  153:     IF
  154: 	ofile count 1 /string tfile place
  155: 	0 ofile c! sourcefilename extractpath ofile place need/
  156: 	tfile count over c@ pathsep? IF 1 /string THEN
  157: 	ofile +place
  158:     THEN ;
  159: 	
  160: : compact// ( adr len -- adr2 len2 )
  161: \ deletes phrases like "//" out of our directory name 2dec97jaw
  162:   over >r
  163:   BEGIN	dup WHILE
  164: 	over c@ pathsep? over 1- 0<> and
  165: 	IF over 1+ c@ pathsep?
  166: 	   IF 	1- over 1+ swap move
  167: 	   THEN
  168: 	THEN
  169: 	1 /string
  170:    REPEAT 
  171:    drop r> tuck - ;
  172: 
  173: : compact.. ( adr len -- adr2 len2 )
  174: \ deletes phrases like "xy/.." out of our directory name 2dec97jaw
  175:   over >r -1 >r
  176:   BEGIN dup WHILE
  177: 	over c@ pathsep? 
  178: 	IF 	r@ -1 =
  179: 		IF	r> drop dup >r
  180: 		ELSE	2dup 1 /string 
  181: 			3 min s" ../" compare
  182: 			0=
  183: 			IF	r@ over - ( diff )
  184: 				2 pick swap - ( dest-adr )
  185: 				>r 3 /string r> swap 2dup >r >r
  186: 				move r> r>
  187: 			ELSE	r> drop dup >r
  188: 			THEN
  189: 		THEN
  190: 	THEN
  191: 	1 /string
  192:   REPEAT 
  193:   r> drop 
  194:   drop r> tuck - ;
  195: 
  196: : reworkdir ( -- )
  197:   remove~+
  198:   ofile count compact// compact..
  199:   nip ofile c! ;
  200: 
  201: : open-ofile ( -- fid ior )
  202:     \G opens the file whose name is in ofile
  203:     expandtopic reworkdir
  204:     ofile count r/o open-file ;
  205: 
  206: : check-path ( adr1 len1 adr2 len2 -- fd 0 | 0 <>0 )
  207:   0 ofile ! >r >r ofile place need/
  208:   r> r> ofile +place
  209:   open-ofile ;
  210: 
  211: : open-path-file ( adr len path-addr -- fd adr1 len2 0 | ior ) \ gforth
  212: \G looks in path path-addr for the file specified by adr len
  213: \G when found the resulting path and an open file descriptor
  214: \G is returned. If the file is not found ior is non zero
  215:   >r
  216:   2dup absolut-path?
  217:   IF    rdrop
  218:         ofile place open-ofile
  219: 	dup 0= IF >r ofile count r> THEN EXIT
  220:   ELSE  r> path>counted
  221:         BEGIN  next-path dup
  222:         WHILE  5 pick 5 pick check-path
  223:         0= IF >r 2drop 2drop r> ofile count 0 EXIT ELSE drop THEN
  224:   REPEAT
  225:         2drop 2drop 2drop -&38
  226:   THEN ;
  227: 
  228: : open-fpath-file ( adr len -- fd adr1 len2 0 | ior ) \ gforth
  229: \G looks in the forth search path for the file specified by adr len
  230: \G when found the resulting path and an open file descriptor
  231: \G is returned. If the file is not found ior is non zero
  232:   fpath open-path-file ;

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