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+$!
+$! OS_VMS_FIX.COM
+$! Copyright (C) 2000, Stephen P. Wall
+$!
+$! Filter files for "#if" line continuations using a '\' and convert
+$! them to use comments for the continuation.  Necessary for VAXC - it
+$! doesn't understand the '\'.
+$!
+$! Yes, this is honkin' ugly code, but I deliberately avoided
+$!     if ...
+$!     then
+$!	   ....
+$!     endif
+$! and call/subroutine/endsubroutine constructs, because I can still
+$! remember when DCL didn't have them, and I wanted this to be as
+$! portable as possible, so...  If you want to structure it nicer for
+$! your own use, please feel free to do so.  However, please only
+$! distribute it in it's original form.
+$!
+$! I wrote it in DCL for portability and ease of use - a C version
+$! would definitely run faster, but then I'd have to deal with compiler
+$! differences, and users would have to deal with configuring and
+$! building it.  With DCL, it runs out-of-the-box.
+$!
+$! Note that if you use this from a VMS system to modify files on a
+$! mounted network drive, f$search() may return only the first matching
+$! file when it tries to resolve wildcards.  I have been unable to find
+$! a way around this.  Either copy the files to a local disk, or specify
+$! each file individually (Keep in mind if you do this that VMS limits
+$! you to eight parameters, so you'll only be able to filter eight files
+$! at a time).
+$!
+$! Ideas...
+$! - Use 'search filespec "#","if","\"/mat=and' to quickly eliminate
+$!   files that definitely don't need filtering.  This should speed
+$!   things up considerable.  Reading and writing every line from every
+$!   file takes quite a bit of time...
+$! - Error handling isn't great.  Come up with something better....
+$!
+$! E-mail addresses:
+$! Steve Wall		hitched97@velnet.com
+$! Zoltan Arpadffy      arpadffy@polarhome.com
+$! John W. Hamill       jhamill3@ford.com
+$!
+$! Modification History:
+$! 13Jul00 SWall	Initial Version
+$! 14Jul00 ZArpadffy    Display usage
+$! 06Mar01 JHamill      Ctrl-M problem fix
+$!
+$! If no parameters, or "-h" for a parameter, print usage and exit
+$
+$ all = "''p1'''p2'''p3'''p4'''p5'''p6'''p7'''p8'"
+$ if (all .nes. "") .and. (p1 .nes. "-h") .and. (p1 .nes. "-H") then goto startup
+$
+$ write sys$output "OS_VMS_FIX - DECC->VAXC pre-processor directive convert script"
+$ write sys$output "Usage: @OS_VMS_FIX <filename_1> <filename_2> <...>"
+$ write sys$output "       @OS_VMS_FIX <filename with wildcard> <...>"
+$ write sys$output ""
+$ write sys$output "Example: @OS_VMS_FIX *.c *.h [.proto]*.pro"
+$ write sys$output "Please note, you can define up to 8 parameters."
+$ write sys$output ""
+$ exit
+$
+$! Create an FDL file to convert VFC format files to Stream_LF.
+$! VMS OPEN/WRITE command creates VFC files.  When VFC files are read
+$! out under unix, they appear to have binary data embedded in them.
+$! To be friendly, we'll convert them to Stream_LF, which reads just
+$! file on unix.
+$
+$startup:
+$ on control_y then goto stopfdl
+$ open/write fdl []convert.fdl
+$ write fdl "SYSTEM"
+$ write fdl " SOURCE VAX/VMS"
+$ write fdl "FILE"
+$ write fdl " ORGANIZATION SEQUENTIAL"
+$ write fdl "RECORD"
+$ write fdl " BLOCK_SPAN YES"
+$ write fdl " CARRIAGE_CONTROL CARRIAGE_RETURN"
+$ write fdl " FORMAT STREAM"
+$ write fdl " SIZE 0"
+$ close fdl
+$ on control_y then goto endparamloop
+$
+$! Some symbols for use later on...
+$
+$ spc = ""
+$ spc[0,8] = 32
+$ tab = ""
+$ tab[0,8] = 9
+$
+$! Scan all positional arguments, do wildcard expansion, and call the
+$! filter routine on each resulting filename.
+$
+$ cnt = 0
+$paramloop:
+$ cnt = cnt + 1
+$
+$! VMS only allows command line parameters P1 - P8, so stop after
+$! processing 8 arguments.
+$
+$ if cnt .eq. 9 then goto endparamloop
+$
+$! Skip any empty parameter.
+$
+$ if P'cnt' .eqs. "" then goto paramloop
+$
+$! Got a parameter - do wildcard expansion.
+$
+$ arg = f$parse(P'cnt')
+$ write sys$output "Parsing ''arg'..."
+$ last = ""
+$fileloop:
+$ file = f$search(arg, 1)
+$
+$! f$search() returns "" after the last of multiple matches.
+$
+$ if file .eqs. "" then goto endfileloop
+$
+$! Strip the version number.
+$
+$ file = f$parse(file,,,"DEVICE") + f$parse(file,,,"DIRECTORY") + -
+         f$parse(file,,,"NAME") + f$parse(file,,,"TYPE")
+$
+$! f$search() returns the same filename over and over if there are no
+$! wildcards in it.
+$
+$ if file .eqs. last then goto endfileloop
+$ last = file
+$
+$! Got a valid file - filter it.
+$
+$ gosub filter
+$
+$! Reset our error handling.
+$
+$ on control_y then goto endparamloop
+$
+$! See if there's another matching filename.
+$
+$ goto fileloop
+$endfileloop:
+$
+$! Check for another parameter.
+$
+$ goto paramloop
+$endparamloop:
+$
+$! Finished - delete the FDL file.
+$
+$ delete []convert.fdl;
+$
+$! So long, and thanks for all the fish...
+$
+$ exit
+$
+$
+$! User aborted with Control-Y during creation of FDL file.
+$! Close the file, delete it, and exit with an error status.
+$
+$stopfdl:
+$ close fdl
+$ delete []convert.fdl;
+$ exit %X10000000
+$
+$
+$! Filter a file.
+$
+$filter:
+$ write sys$output "Filtering ''file'..."
+$
+$! Get a temporary filename from the subroutine parameter.
+$
+$ tmp = f$parse(file,,,"DEVICE") + f$parse(file,,,"DIRECTORY") + -
+        "tmp_" + f$parse(file,,,"NAME") + f$parse(file,,,"TYPE")
+$ on control_y then goto aborted
+$ open /read input 'file'
+$ open /write output 'tmp'
+$ changed = 0
+$readloop:
+$ read/end_of_file=endreadloop/error=readlooperror input line
+$
+$! Get the first 3 non-blank character on the line.
+$
+$ start = f$extract(0,3,f$edit(line,"COLLAPSE,LOWERCASE"))
+$
+$! If the line doesn't start with some form of "#if", just write it to
+$! the temp file.
+$
+$ if start .nes. "#if" then goto writeit
+$chkbkslsh:
+$
+$! See if the line ends in a backslash.  If not, write it to the temp file.
+$
+$ if f$extract(f$length(line)-1,1,line) .nes. "\" then goto writeit
+$
+$! Ok, got a line that needs to be modified.  Mark this file as changed,
+$! then replace the backslash at the end with the beginning of a comment
+$! (/*), and write it to the temp file.
+$
+$ changed = 1
+$ line = f$extract(0,f$length(line)-1,line) + "/*"
+$ write/symbol output line
+$
+$! Get another line from the input.
+$
+$ read/end_of_file=endreadloop/error=readlooperror input line
+$
+$! Grab all the blank space from the beginning of the line.
+$
+$ spaces = ""
+$spaceloop:
+$ if (f$extract(0,1,line) .nes. spc) .and. (f$extract(0,1,line) .nes. tab) -
+        then goto endspaceloop
+$ spaces = spaces + f$extract(0,1,line)
+$ line = f$extract(1,f$length(line)-1,line)
+$ goto spaceloop
+$endspaceloop:
+$
+$! Stick an end-comment (*/) after the leading blanks, then go back and
+$! check for a trailing backslash again, to catch code that continues
+$! across multiple lines.
+$
+$ line = spaces + "*/ " + line
+$ goto chkbkslsh
+$
+$! Write the current line, (will either be an untouched line, or the
+$! last line of a continuation) to the temp file, and go back to look
+$! for more input.
+$!
+$writeit:
+$ write/symbol output line
+$ goto readloop
+$
+$! Hit EOF.  Close the input & output, and if the file was marked as
+$! changed, convert it from VMS VFC format, to the more common Stream_LF
+$! format, so it doesn't show up full of garbage if someone tries to
+$! edit it on another OS.
+$!
+$endreadloop:
+$ close input
+$ close output
+$ if changed .eq. 0 then goto nocopy
+$ convert 'tmp' 'file' /fdl=[]convert.fdl
+$nocopy:
+$ delete 'tmp';
+$
+$! Exit this subroutine.
+$
+$ goto endfunc
+$
+$! Got a read error.  Say so, and trash the temp file.
+$
+$readlooperror:
+$ write sys$error "Error processing file ''file'"
+$ goto errorend
+$
+$! Got an interrupt.  Say so, and trash the temp file.
+$
+$aborted:
+$ write sys$error "Aborted while processing file ''file'"
+$
+$! Common code for read errors and interrupts.
+$
+$errorend:
+$ close input
+$ close output
+$ delete 'tmp';
+$ return %X10000000
+$
+$! End of filter subroutine.
+$
+$endfunc:
+$ return
+$
+$! EOF