misc/makedef.cmd

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  28
  29 /*
  30  * $Id: makedef.cmd,v 1.5 2006/04/22 23:14:50 tom Exp $
  31  *
  32  * Author:  Juan Jose Garcia Ripoll <worm@arrakis.es>.
  33  * Webpage: http://www.arrakis.es/~worm/
  34  *
  35  * makedef.cmd - update a DLL export list using a newly created library file
  36  *               in a.out format, plus an old .DEF file.
  37  *
  38  * standard output gets a sorted list with all entrypoints with entrycodes.
  39  * This list, plus a few .def sentences (LIBRARY, DESCRIPTION and EXPORT)
  40  * is used to build a new .def file.
  41  *
  42  * `_nc_*' symbols are ignored.
  43  *
  44  * returns 1 when the old def_file is corrupted -- that is, export items are
  45  * not properly formatted.
  46  *
  47  * returns 0 if everything went OK.
  48  */
  49
  50 parse arg lib_file def_file
  51
  52 lib_file = translate(lib_file,'\','/')
  53 def_file = translate(def_file,'\','/')
  54
  55 call CleanQueue
  56
  57 /*
  58  * `codes' is the stem that links a code to every symbol
  59  * `names' is the stem where symbols are stored sequentially
  60  * `last' is the index of the last symbol defined
  61  */
  62 last   = 0
  63 used.  = 0
  64 codes. = 0
  65 names. = ''
  66
  67 tmp_name = 'foo.tmp'
  68
  69 /*
  70  * This sed expression cleans empty lines, comments and special .DEF
  71  * commands, such as LIBRARY..., EXPORTS..., etc
  72  */
  73 tidy_up  = '"/^[A-Z]/d;s/[      ][      ]*/ /g;s/;.*$//g;s/^[ ]*//g;/^[ ]*$/d"'
  74
  75 /*
  76  * First we find all public symbols (functions and variables). Next we
  77  * concatenate this list with the old one, sorting it and wiping out
  78  * all unused data (comments, DLL directives, blanks, etc). All this
  79  * information is pushed into a REXX private list with the RXQUEUE
  80  * utility program.
  81  */
  82 '@echo off'
  83 'emxexp -u' lib_file '>' tmp_name
  84 'cat' tmp_name def_file '| sed' tidy_up '| sort > foo2.tmp'
  85 'type foo2.tmp | rxqueue'
  86 'del' tmp_name '1>NUL'
  87
  88 /*
  89  * This loop runs over the queue items
  90  */
  91 do while queued() > 0
  92    /*
  93     * We retrieve the symbol name (NEW_NAME) and its number (NEW_NUMBER)
  94     * When the line comes from `emximp's output, there's no number, so
  95     * we assign it the special value 0.
  96     */
  97    parse pull new_symbol '@'new_code rest
  98    if Left(new_symbol,1) = '"' then
  99       parse var new_symbol '"' new_name '"' rest
 100    else
 101       do
 102       echo 'Symbol 'new_symbol' was not quoted'
 103       new_name = new_symbol
 104       end
 105
 106    if new_code = '' then
 107       new_code = 0
 108    /*
 109     * Here, one would place all smart checks that would kill unused symbols.
 110     * However, export tables are not that big, so why bothering?
 111    if Left(new_name,4) = '_nc_' then
 112       iterate
 113     */
 114    /*
 115     * The algorithm:
 116     *   IF (this is the 2nd time the symbol appears) THEN
 117     *           (this symbol comes from a .DEF file)
 118     *           it has a valid code that we store
 119     *           we mark that code as used
 120     *   ELIF (it has no number) THEN
 121     *           (it's a new symbol)
 122     *           we increase the counter of defined symbols
 123     *           we assign it the special number 0
 124     *           (later on it'll be assigned an unused export code)
 125     *   ELSE
 126     *           this symbol was in the old DLL and it's no longer
 127     *           here, so we skip it.
 128     */
 129    select
 130       when new_name = '' then
 131          'echo Warning: empty symbol found 1>&2'
 132       when names.last = new_name then
 133          do
 134          codes.last = new_code
 135          used.new_code = 1
 136          end
 137       when new_code = 0 then
 138          do
 139          last = last + 1
 140          names.last = new_name
 141          codes.last = 0
 142          end
 143    otherwise
 144       'echo Warning: symbol "'new_name'" has disappeared 1>&2'
 145    end /* select */
 146 end /* do while queued() */
 147
 148 /*
 149  * Finally we scan the stem, writing out all symbols with export codes.
 150  * Those that did not have a valid one (just 0) are assigned a new one.
 151  */
 152 new_code = 1
 153 inx = 1
 154 do while inx <= last
 155    if codes.inx = 0 then
 156       do
 157       do while used.new_code \= 0
 158          new_code = new_code + 1
 159       end
 160       codes.inx = new_code
 161       used.new_code = 1
 162       end
 163    say '        "'names.inx'"   @'codes.inx'    NONAME'
 164    inx = inx + 1
 165 end
 166 'del foo2.tmp 1>NUL'
 167 exit 0
 168
 169 /*
 170  * Cleans the REXX queue by pulling and forgetting every line.
 171  * This is needed, at least, when `makedef.cmd' starts, because an aborted
 172  * REXX program might have left some rubbish in.
 173  */
 174 CleanQueue: procedure
 175    do while queued() > 0
 176       parse pull foo
 177    end
 178 return
 179