diff options
Diffstat (limited to 'posix')
| -rw-r--r-- | posix/getopt_init.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/posix/getopt_init.c b/posix/getopt_init.c new file mode 100644 index 0000000000..e90c9d7d8a --- /dev/null +++ b/posix/getopt_init.c @@ -0,0 +1,77 @@ +/* Perform additional initialization for getopt functions in GNU libc. + Copyright (C) 1997 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" + +/* External variable to synchronize work. */ +extern char *__getopt_nonoption_flags; + +extern pid_t __libc_pid; + + +/* 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 (void) +{ + /* 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; + + /* Generate name of the environment variable. We must know the PID + and we must not use `sprintf'. */ + if (__libc_pid == 0) + __libc_pid = getpid (); + + /* Construct "_<PID>_GNU_nonoption_argv_flags_" string. */ + cp = memcpy (&var[sizeof (var) - sizeof (envvar_tail)], envvar_tail, + sizeof (envvar_tail)); + cp = _itoa_word (__libc_pid, cp, 10, 0); + *--cp = '_'; + len = (var + sizeof (var) - 1) - cp; + + for (ep = __environ; *ep != NULL; ++ep) + if (!strncmp (*ep, cp, len) && (*ep)[len] == '=') + { + /* Found it. Store this pointer and move later ones back. */ + char **dp = ep; + __getopt_nonoption_flags = &(*ep)[len + 1]; + do + dp[0] = dp[1]; + while (*dp++); + /* Continue the loop in case the name appears again. */ + } +} |