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75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/* Perform additional initialization for getopt functions in GNU libc.
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Copyright (C) 1997-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifdef USE_NONOPTION_FLAGS
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/* Attention: this file is *not* necessary when the GNU getopt functions
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are used outside the GNU libc. Some additional functionality of the
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getopt functions in GNU libc require this additional work. */
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#include <getopt.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <_itoa.h>
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/* Variable to synchronize work. */
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char *__getopt_nonoption_flags;
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/* Remove the environment variable "_<PID>_GNU_nonoption_argv_flags_" if
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it is still available. If the getopt functions are also used in the
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application it does not exist anymore since it was saved for the use
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in getopt. */
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void
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__getopt_clean_environment (char **env)
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{
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/* Bash 2.0 puts a special variable in the environment for each
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command it runs, specifying which ARGV elements are the results
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of file name wildcard expansion and therefore should not be
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considered as options. */
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static const char envvar_tail[] = "_GNU_nonoption_argv_flags_=";
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char var[50];
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char *cp, **ep;
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size_t len;
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/* Construct the "_<PID>_GNU_nonoption_argv_flags_=" string. We must
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not use `sprintf'. */
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cp = memcpy (&var[sizeof (var) - sizeof (envvar_tail)], envvar_tail,
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sizeof (envvar_tail));
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cp = _itoa_word (__getpid (), cp, 10, 0);
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/* Note: we omit adding the leading '_' since we explicitly test for
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it before calling strncmp. */
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len = (var + sizeof (var) - 1) - cp;
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for (ep = env; *ep != NULL; ++ep)
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if ((*ep)[0] == '_'
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&& __builtin_expect (strncmp (*ep + 1, cp, len) == 0, 0))
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{
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/* Found it. Store this pointer and move later ones back. */
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char **dp = ep;
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__getopt_nonoption_flags = &(*ep)[len];
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do
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dp[0] = dp[1];
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while (*dp++);
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/* Continue the loop in case the name appears again. */
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}
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}
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#endif /* USE_NONOPTION_FLAGS */
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