xref: /openssl/apps/lib/vms_decc_argv.c (revision 38fc02a7)
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 
14 char **newargv = NULL;
15 
cleanup_argv(void)16 static void cleanup_argv(void)
17 {
18     OPENSSL_free(newargv);
19     newargv = NULL;
20 }
21 
copy_argv(int * argc,char * argv[])22 char **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