mirror of git://sourceware.org/git/glibc.git
76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/* Perform additional initialization for getopt functions in GNU libc.
|
|
Copyright (C) 1997, 1998, 2001 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#ifdef USE_NONOPTION_FLAGS
|
|
/* Attention: this file is *not* necessary when the GNU getopt functions
|
|
are used outside the GNU libc. Some additional functionality of the
|
|
getopt functions in GNU libc require this additional work. */
|
|
|
|
#include <getopt.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <stdio-common/_itoa.h>
|
|
|
|
/* Variable to synchronize work. */
|
|
char *__getopt_nonoption_flags;
|
|
|
|
|
|
/* Remove the environment variable "_<PID>_GNU_nonoption_argv_flags_" if
|
|
it is still available. If the getopt functions are also used in the
|
|
application it does not exist anymore since it was saved for the use
|
|
in getopt. */
|
|
void
|
|
__getopt_clean_environment (char **env)
|
|
{
|
|
/* Bash 2.0 puts a special variable in the environment for each
|
|
command it runs, specifying which ARGV elements are the results
|
|
of file name wildcard expansion and therefore should not be
|
|
considered as options. */
|
|
static const char envvar_tail[] = "_GNU_nonoption_argv_flags_=";
|
|
char var[50];
|
|
char *cp, **ep;
|
|
size_t len;
|
|
|
|
/* Construct the "_<PID>_GNU_nonoption_argv_flags_=" string. We must
|
|
not use `sprintf'. */
|
|
cp = memcpy (&var[sizeof (var) - sizeof (envvar_tail)], envvar_tail,
|
|
sizeof (envvar_tail));
|
|
cp = _itoa_word (__getpid (), cp, 10, 0);
|
|
/* Note: we omit adding the leading '_' since we explicitly test for
|
|
it before calling strncmp. */
|
|
len = (var + sizeof (var) - 1) - cp;
|
|
|
|
for (ep = env; *ep != NULL; ++ep)
|
|
if ((*ep)[0] == '_'
|
|
&& __builtin_expect (strncmp (*ep + 1, cp, len) == 0, 0))
|
|
{
|
|
/* Found it. Store this pointer and move later ones back. */
|
|
char **dp = ep;
|
|
__getopt_nonoption_flags = &(*ep)[len];
|
|
do
|
|
dp[0] = dp[1];
|
|
while (*dp++);
|
|
/* Continue the loop in case the name appears again. */
|
|
}
|
|
}
|
|
#endif /* USE_NONOPTION_FLAGS */
|