VMS: add [.util]shlib_wrap.exe and its build instructions

IF[{- $target{build_scheme}->[1] eq "VMS" -}]

 PROGRAMS_NO_INST=shlib_wrap

 SOURCE[shlib_wrap]=shareable_image_wrap.c

 GENERATE[shareable_image_wrap.c]=shareable_image_wrap.c.in

ELSIF[{- $target{build_scheme}->[1] eq "unix" -}]

 SCRIPTS_NO_INST=shlib_wrap.sh

 SOURCE[shlib_wrap.sh]=shlib_wrap.sh.in

ENDIF

/*

 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/*

 * This program allows for easy execution of programs in the OpenSSL build

 * directory, in a manner that's similar to how util/shlib_wrap.sh.  Simply

 * take the command you want to execute and prefix that with

 * 'mcr [.util]shlib_wrap', for example:

 *

 * $ mcr [.util]shlib_wrap mcr [.apps]openssl s_client -connect www.openssl.org:443

 */

#ifndef __VMS

# error "VMS ONLY!"

#endif

#include <stdio.h>

#include <descrip.h>

#include <ssdef.h>

#include <lib$routines.h>

{-

    use File::Spec::Functions qw(rel2abs);

    our $sv = sprintf "%02d%02d", $config{shlib_major}, $config{shlib_minor};

    our $pz = $config{pointer_size};

    our $bldd = rel2abs($config{builddir});

    ""

-}

/* The logical name table we check and affect */

$DESCRIPTOR(lnm_process_table, "LNM$PROCESS_TABLE");

/* The first logical name we deal with, the buffer for its old value,

 * and its temporary new value

 */

const $DESCRIPTOR(lnm1, "OSSL$LIBCRYPTO{- $sv -}_SHR{- $pz -}");

char lnm1oldbuf[256]; short lnm1oldlen = 0;

$DESCRIPTOR(lnm1old, lnm1oldbuf);

const $DESCRIPTOR(lnm1new, "{- $bldd -}OSSL$LIBCRYPTO{- $sv -}_SHR{- $pz -}.EXE");

/* The second logical name we deal with, the buffer for its old value,

 * and its temporary new value

 */

const $DESCRIPTOR(lnm2, "OSSL$LIBSSL{- $sv -}_SHR{- $pz -}");

char lnm2oldbuf[256]; short lnm2oldlen = 0;

$DESCRIPTOR(lnm2old, lnm2oldbuf);

const $DESCRIPTOR(lnm2new, "{- $bldd -}OSSL$LIBSSL{- $sv -}_SHR{- $pz -}.EXE");

/* The foreign command we want to run with the logical names above set

 * to their temporary values

 */

char foreign_cmd_buf[4096]; short foreign_cmd_len = 0;

$DESCRIPTOR(foreign_cmd, foreign_cmd_buf);

int main()

{

    int status = 0;

    int lnm1status = 0, lnm2status = 0;

    /* Fetch the command line.  lib$get_foreign() is nice enough to

     * strip away the program name, thus only returning the arguments,

     * which is exactly what we need.

     */

    lib$get_foreign(&foreign_cmd, 0, &foreign_cmd_len);

    foreign_cmd.dsc$w_length = foreign_cmd_len;

#ifdef DEBUG

    foreign_cmd_buf[foreign_cmd_len] = '\0';

    printf("[%d] %s\n\n", foreign_cmd_len, foreign_cmd_buf);

#endif

    /* Fetch the first logical name value and save the status */

    lnm1status = lib$get_logical(&lnm1, &lnm1old, &lnm1oldlen,

                                 &lnm_process_table);

    if (lnm1status == SS$_NORMAL)

        lnm1old.dsc$w_length = lnm1oldlen;

    else if (lnm1status != SS$_NOLOGNAM)

        return lnm1status;

    /* Fetch the first logical name value and save the status */

    lnm2status = lib$get_logical(&lnm2, &lnm2old, &lnm2oldlen,

                                 &lnm_process_table);

    if (lnm2status == SS$_NORMAL)

        lnm2old.dsc$w_length = lnm2oldlen;

    else if (lnm2status != SS$_NOLOGNAM)

        return lnm2status;

    /* Set the temporary new values for both logical names */

    lib$set_logical(&lnm1, &lnm1new, &lnm_process_table);

    lib$set_logical(&lnm2, &lnm2new, &lnm_process_table);

    /* Execute the arguments as a command.  The better be a command! */

    status = lib$spawn(&foreign_cmd);

    /* If the logical names we set had old values, restore them.

     * Otherwise, simply delete their current values.

     */

    if (lnm1status == SS$_NORMAL)

        lib$set_logical(&lnm1, &lnm1old, &lnm_process_table);

    else

        lib$delete_logical(&lnm1, &lnm_process_table);

    if (lnm2status == SS$_NORMAL)

        lib$set_logical(&lnm2, &lnm2old, &lnm_process_table);

    else

        lib$delete_logical(&lnm2, &lnm_process_table);

    /* Return the status from the execution of the foreign command */

    return status;

}