1 | /* Perform additional initialization for getopt functions in GNU libc. |
2 | Copyright (C) 1997-2016 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ |
19 | |
20 | #ifdef USE_NONOPTION_FLAGS |
21 | /* Attention: this file is *not* necessary when the GNU getopt functions |
22 | are used outside the GNU libc. Some additional functionality of the |
23 | getopt functions in GNU libc require this additional work. */ |
24 | |
25 | #include <getopt.h> |
26 | #include <string.h> |
27 | #include <unistd.h> |
28 | #include <sys/types.h> |
29 | |
30 | #include <_itoa.h> |
31 | |
32 | /* Variable to synchronize work. */ |
33 | char *__getopt_nonoption_flags; |
34 | |
35 | |
36 | /* Remove the environment variable "_<PID>_GNU_nonoption_argv_flags_" if |
37 | it is still available. If the getopt functions are also used in the |
38 | application it does not exist anymore since it was saved for the use |
39 | in getopt. */ |
40 | void |
41 | __getopt_clean_environment (char **env) |
42 | { |
43 | /* Bash 2.0 puts a special variable in the environment for each |
44 | command it runs, specifying which ARGV elements are the results |
45 | of file name wildcard expansion and therefore should not be |
46 | considered as options. */ |
47 | static const char envvar_tail[] = "_GNU_nonoption_argv_flags_=" ; |
48 | char var[50]; |
49 | char *cp, **ep; |
50 | size_t len; |
51 | |
52 | /* Construct the "_<PID>_GNU_nonoption_argv_flags_=" string. We must |
53 | not use `sprintf'. */ |
54 | cp = memcpy (&var[sizeof (var) - sizeof (envvar_tail)], envvar_tail, |
55 | sizeof (envvar_tail)); |
56 | cp = _itoa_word (__getpid (), cp, 10, 0); |
57 | /* Note: we omit adding the leading '_' since we explicitly test for |
58 | it before calling strncmp. */ |
59 | len = (var + sizeof (var) - 1) - cp; |
60 | |
61 | for (ep = env; *ep != NULL; ++ep) |
62 | if ((*ep)[0] == '_' |
63 | && __builtin_expect (strncmp (*ep + 1, cp, len) == 0, 0)) |
64 | { |
65 | /* Found it. Store this pointer and move later ones back. */ |
66 | char **dp = ep; |
67 | __getopt_nonoption_flags = &(*ep)[len]; |
68 | do |
69 | dp[0] = dp[1]; |
70 | while (*dp++); |
71 | /* Continue the loop in case the name appears again. */ |
72 | } |
73 | } |
74 | #endif /* USE_NONOPTION_FLAGS */ |
75 | |