/* Perform additional initialization for getopt functions in GNU libc. Copyright (C) 1997, 1998 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* 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[100]; 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); *--cp = '_'; len = (var + sizeof (var) - 1) - cp; for (ep = env; *ep != NULL; ++ep) if (!strncmp (*ep, cp, len)) { /* 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. */ } }