1/*
2 * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdlib.h>
11#include <openssl/crypto.h>
12#include "platform.h"            /* for copy_argv() */
13
14char **newargv = NULL;
15
16static void cleanup_argv(void)
17{
18    OPENSSL_free(newargv);
19    newargv = NULL;
20}
21
22char **copy_argv(int *argc, char *argv[])
23{
24    /*-
25     * The note below is for historical purpose.  On VMS now we always
26     * copy argv "safely."
27     *
28     * 2011-03-22 SMS.
29     * If we have 32-bit pointers everywhere, then we're safe, and
30     * we bypass this mess, as on non-VMS systems.
31     * Problem 1: Compaq/HP C before V7.3 always used 32-bit
32     * pointers for argv[].
33     * Fix 1: For a 32-bit argv[], when we're using 64-bit pointers
34     * everywhere else, we always allocate and use a 64-bit
35     * duplicate of argv[].
36     * Problem 2: Compaq/HP C V7.3 (Alpha, IA64) before ECO1 failed
37     * to NULL-terminate a 64-bit argv[].  (As this was written, the
38     * compiler ECO was available only on IA64.)
39     * Fix 2: Unless advised not to (VMS_TRUST_ARGV), we test a
40     * 64-bit argv[argc] for NULL, and, if necessary, use a
41     * (properly) NULL-terminated (64-bit) duplicate of argv[].
42     * The same code is used in either case to duplicate argv[].
43     * Some of these decisions could be handled in preprocessing,
44     * but the code tends to get even uglier, and the penalty for
45     * deciding at compile- or run-time is tiny.
46     */
47
48    int i, count = *argc;
49    char **p = newargv;
50
51    cleanup_argv();
52
53    /*
54     * We purposefully use OPENSSL_malloc() rather than app_malloc() here,
55     * to avoid symbol name clashes in test programs that would otherwise
56     * get them when linking with all of libapps.a.
57     * See comment in test/build.info.
58     */
59    newargv = OPENSSL_malloc(sizeof(*newargv) * (count + 1));
60    if (newargv == NULL)
61        return NULL;
62
63    /* Register automatic cleanup on first use */
64    if (p == NULL)
65        OPENSSL_atexit(cleanup_argv);
66
67    for (i = 0; i < count; i++)
68        newargv[i] = argv[i];
69    newargv[i] = NULL;
70    *argc = i;
71    return newargv;
72}
73