| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 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 */ |