diff options
Diffstat (limited to 'libc/posix/getopt_init.c')
-rw-r--r-- | libc/posix/getopt_init.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/libc/posix/getopt_init.c b/libc/posix/getopt_init.c new file mode 100644 index 000000000..d460098c8 --- /dev/null +++ b/libc/posix/getopt_init.c @@ -0,0 +1,75 @@ +/* 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 */ |