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variables.c
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/* variables.c -- Functions for hacking shell variables. */
/* Copyright (C) 1987-2020 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "bashtypes.h"
#include "posixstat.h"
#include "posixtime.h"
#if defined (__QNX__)
# if defined (__QNXNTO__)
# include <sys/netmgr.h>
# else
# include <sys/vc.h>
# endif /* !__QNXNTO__ */
#endif /* __QNX__ */
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <stdio.h>
#include "chartypes.h"
#if defined (HAVE_PWD_H)
# include <pwd.h>
#endif
#include "bashansi.h"
#include "bashintl.h"
#include "filecntl.h"
#define NEED_XTRACE_SET_DECL
#include "shell.h"
#include "parser.h"
#include "flags.h"
#include "execute_cmd.h"
#include "findcmd.h"
#include "mailcheck.h"
#include "input.h"
#include "hashcmd.h"
#include "pathexp.h"
#include "alias.h"
#include "jobs.h"
#include "version.h"
#include "builtins/getopt.h"
#include "builtins/common.h"
#include "builtins/builtext.h"
#if defined (READLINE)
# include "bashline.h"
# include <readline/readline.h>
#else
# include <tilde/tilde.h>
#endif
#if defined (HISTORY)
# include "bashhist.h"
# include <readline/history.h>
#endif /* HISTORY */
#if defined (PROGRAMMABLE_COMPLETION)
# include "pcomplete.h"
#endif
#define VARIABLES_HASH_BUCKETS 1024 /* must be power of two */
#define FUNCTIONS_HASH_BUCKETS 512
#define TEMPENV_HASH_BUCKETS 4 /* must be power of two */
#define BASHFUNC_PREFIX "BASH_FUNC_"
#define BASHFUNC_PREFLEN 10 /* == strlen(BASHFUNC_PREFIX */
#define BASHFUNC_SUFFIX "%%"
#define BASHFUNC_SUFFLEN 2 /* == strlen(BASHFUNC_SUFFIX) */
/* flags for find_variable_internal */
#define FV_FORCETEMPENV 0x01
#define FV_SKIPINVISIBLE 0x02
#define FV_NODYNAMIC 0x04
extern char **environ;
/* Variables used here and defined in other files. */
extern time_t shell_start_time;
extern struct timeval shellstart;
/* The list of shell variables that the user has created at the global
scope, or that came from the environment. */
VAR_CONTEXT *global_variables = (VAR_CONTEXT *)NULL;
/* The current list of shell variables, including function scopes */
VAR_CONTEXT *shell_variables = (VAR_CONTEXT *)NULL;
/* The list of shell functions that the user has created, or that came from
the environment. */
HASH_TABLE *shell_functions = (HASH_TABLE *)NULL;
HASH_TABLE *invalid_env = (HASH_TABLE *)NULL;
#if defined (DEBUGGER)
/* The table of shell function definitions that the user defined or that
came from the environment. */
HASH_TABLE *shell_function_defs = (HASH_TABLE *)NULL;
#endif
/* The current variable context. This is really a count of how deep into
executing functions we are. */
int variable_context = 0;
/* If non-zero, local variables inherit values and attributes from a variable
with the same name at a previous scope. */
int localvar_inherit = 0;
/* If non-zero, calling `unset' on local variables in previous scopes marks
them as invisible so lookups find them unset. This is the same behavior
as local variables in the current local scope. */
int localvar_unset = 0;
/* The set of shell assignments which are made only in the environment
for a single command. */
HASH_TABLE *temporary_env = (HASH_TABLE *)NULL;
/* Set to non-zero if an assignment error occurs while putting variables
into the temporary environment. */
int tempenv_assign_error;
/* Some funky variables which are known about specially. Here is where
"$*", "$1", and all the cruft is kept. */
char *dollar_vars[10];
WORD_LIST *rest_of_args = (WORD_LIST *)NULL;
int posparam_count = 0;
/* The value of $$. */
pid_t dollar_dollar_pid;
/* Non-zero means that we have to remake EXPORT_ENV. */
int array_needs_making = 1;
/* The number of times BASH has been executed. This is set
by initialize_variables (). */
int shell_level = 0;
/* An array which is passed to commands as their environment. It is
manufactured from the union of the initial environment and the
shell variables that are marked for export. */
char **export_env = (char **)NULL;
static int export_env_index;
static int export_env_size;
#if defined (READLINE)
static int winsize_assignment; /* currently assigning to LINES or COLUMNS */
#endif
SHELL_VAR nameref_invalid_value;
static SHELL_VAR nameref_maxloop_value;
static HASH_TABLE *last_table_searched; /* hash_lookup sets this */
static VAR_CONTEXT *last_context_searched;
/* Some forward declarations. */
static void create_variable_tables PARAMS((void));
static void set_machine_vars PARAMS((void));
static void set_home_var PARAMS((void));
static void set_shell_var PARAMS((void));
static char *get_bash_name PARAMS((void));
static void initialize_shell_level PARAMS((void));
static void uidset PARAMS((void));
#if defined (ARRAY_VARS)
static void make_vers_array PARAMS((void));
#endif
static SHELL_VAR *null_assign PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
#if defined (ARRAY_VARS)
static SHELL_VAR *null_array_assign PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
#endif
static SHELL_VAR *get_self PARAMS((SHELL_VAR *));
#if defined (ARRAY_VARS)
static SHELL_VAR *init_dynamic_array_var PARAMS((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
static SHELL_VAR *init_dynamic_assoc_var PARAMS((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
#endif
static SHELL_VAR *assign_seconds PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_seconds PARAMS((SHELL_VAR *));
static SHELL_VAR *init_seconds_var PARAMS((void));
static SHELL_VAR *assign_random PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_random PARAMS((SHELL_VAR *));
static SHELL_VAR *get_urandom PARAMS((SHELL_VAR *));
static SHELL_VAR *assign_lineno PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_lineno PARAMS((SHELL_VAR *));
static SHELL_VAR *assign_subshell PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_subshell PARAMS((SHELL_VAR *));
static SHELL_VAR *get_epochseconds PARAMS((SHELL_VAR *));
static SHELL_VAR *get_epochrealtime PARAMS((SHELL_VAR *));
static SHELL_VAR *get_bashpid PARAMS((SHELL_VAR *));
static SHELL_VAR *get_bash_argv0 PARAMS((SHELL_VAR *));
static SHELL_VAR *assign_bash_argv0 PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
static void set_argv0 PARAMS((void));
#if defined (HISTORY)
static SHELL_VAR *get_histcmd PARAMS((SHELL_VAR *));
#endif
#if defined (READLINE)
static SHELL_VAR *get_comp_wordbreaks PARAMS((SHELL_VAR *));
static SHELL_VAR *assign_comp_wordbreaks PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
#endif
#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
static SHELL_VAR *assign_dirstack PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_dirstack PARAMS((SHELL_VAR *));
#endif
#if defined (ARRAY_VARS)
static SHELL_VAR *get_groupset PARAMS((SHELL_VAR *));
# if defined (DEBUGGER)
static SHELL_VAR *get_bashargcv PARAMS((SHELL_VAR *));
# endif
static SHELL_VAR *build_hashcmd PARAMS((SHELL_VAR *));
static SHELL_VAR *get_hashcmd PARAMS((SHELL_VAR *));
static SHELL_VAR *assign_hashcmd PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
# if defined (ALIAS)
static SHELL_VAR *build_aliasvar PARAMS((SHELL_VAR *));
static SHELL_VAR *get_aliasvar PARAMS((SHELL_VAR *));
static SHELL_VAR *assign_aliasvar PARAMS((SHELL_VAR *, char *, arrayind_t, char *));
# endif
#endif
static SHELL_VAR *get_funcname PARAMS((SHELL_VAR *));
static SHELL_VAR *init_funcname_var PARAMS((void));
static void initialize_dynamic_variables PARAMS((void));
static SHELL_VAR *bind_invalid_envvar PARAMS((const char *, char *, int));
static int var_sametype PARAMS((SHELL_VAR *, SHELL_VAR *));
static SHELL_VAR *hash_lookup PARAMS((const char *, HASH_TABLE *));
static SHELL_VAR *new_shell_variable PARAMS((const char *));
static SHELL_VAR *make_new_variable PARAMS((const char *, HASH_TABLE *));
static SHELL_VAR *bind_variable_internal PARAMS((const char *, char *, HASH_TABLE *, int, int));
static void dispose_variable_value PARAMS((SHELL_VAR *));
static void free_variable_hash_data PARAMS((PTR_T));
static VARLIST *vlist_alloc PARAMS((int));
static VARLIST *vlist_realloc PARAMS((VARLIST *, int));
static void vlist_add PARAMS((VARLIST *, SHELL_VAR *, int));
static void flatten PARAMS((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int));
static int qsort_var_comp PARAMS((SHELL_VAR **, SHELL_VAR **));
static SHELL_VAR **vapply PARAMS((sh_var_map_func_t *));
static SHELL_VAR **fapply PARAMS((sh_var_map_func_t *));
static int visible_var PARAMS((SHELL_VAR *));
static int visible_and_exported PARAMS((SHELL_VAR *));
static int export_environment_candidate PARAMS((SHELL_VAR *));
static int local_and_exported PARAMS((SHELL_VAR *));
static int visible_variable_in_context PARAMS((SHELL_VAR *));
static int variable_in_context PARAMS((SHELL_VAR *));
#if defined (ARRAY_VARS)
static int visible_array_vars PARAMS((SHELL_VAR *));
#endif
static SHELL_VAR *find_variable_internal PARAMS((const char *, int));
static SHELL_VAR *find_nameref_at_context PARAMS((SHELL_VAR *, VAR_CONTEXT *));
static SHELL_VAR *find_variable_nameref_context PARAMS((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
static SHELL_VAR *find_variable_last_nameref_context PARAMS((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
static SHELL_VAR *bind_tempenv_variable PARAMS((const char *, char *));
static void push_posix_temp_var PARAMS((PTR_T));
static void push_temp_var PARAMS((PTR_T));
static void propagate_temp_var PARAMS((PTR_T));
static void dispose_temporary_env PARAMS((sh_free_func_t *));
static inline char *mk_env_string PARAMS((const char *, const char *, int));
static char **make_env_array_from_var_list PARAMS((SHELL_VAR **));
static char **make_var_export_array PARAMS((VAR_CONTEXT *));
static char **make_func_export_array PARAMS((void));
static void add_temp_array_to_env PARAMS((char **, int, int));
static int n_shell_variables PARAMS((void));
static int set_context PARAMS((SHELL_VAR *));
static void push_func_var PARAMS((PTR_T));
static void push_builtin_var PARAMS((PTR_T));
static void push_exported_var PARAMS((PTR_T));
/* This needs to be looked at again. */
static inline void push_posix_tempvar_internal PARAMS((SHELL_VAR *, int));
static inline int find_special_var PARAMS((const char *));
static void
create_variable_tables ()
{
if (shell_variables == 0)
{
shell_variables = global_variables = new_var_context ((char *)NULL, 0);
shell_variables->scope = 0;
shell_variables->table = hash_create (VARIABLES_HASH_BUCKETS);
}
if (shell_functions == 0)
shell_functions = hash_create (FUNCTIONS_HASH_BUCKETS);
#if defined (DEBUGGER)
if (shell_function_defs == 0)
shell_function_defs = hash_create (FUNCTIONS_HASH_BUCKETS);
#endif
}
/* Initialize the shell variables from the current environment.
If PRIVMODE is nonzero, don't import functions from ENV or
parse $SHELLOPTS. */
void
initialize_shell_variables (env, privmode)
char **env;
int privmode;
{
char *name, *string, *temp_string;
int c, char_index, string_index, string_length, ro;
SHELL_VAR *temp_var;
create_variable_tables ();
for (string_index = 0; env && (string = env[string_index++]); )
{
char_index = 0;
name = string;
while ((c = *string++) && c != '=')
;
if (string[-1] == '=')
char_index = string - name - 1;
/* If there are weird things in the environment, like `=xxx' or a
string without an `=', just skip them. */
if (char_index == 0)
continue;
/* ASSERT(name[char_index] == '=') */
name[char_index] = '\0';
/* Now, name = env variable name, string = env variable value, and
char_index == strlen (name) */
temp_var = (SHELL_VAR *)NULL;
#if defined (FUNCTION_IMPORT)
/* If exported function, define it now. Don't import functions from
the environment in privileged mode. */
if (privmode == 0 && read_but_dont_execute == 0 &&
STREQN (BASHFUNC_PREFIX, name, BASHFUNC_PREFLEN) &&
STREQ (BASHFUNC_SUFFIX, name + char_index - BASHFUNC_SUFFLEN) &&
STREQN ("() {", string, 4))
{
size_t namelen;
char *tname; /* desired imported function name */
namelen = char_index - BASHFUNC_PREFLEN - BASHFUNC_SUFFLEN;
tname = name + BASHFUNC_PREFLEN; /* start of func name */
tname[namelen] = '\0'; /* now tname == func name */
string_length = strlen (string);
temp_string = (char *)xmalloc (namelen + string_length + 2);
memcpy (temp_string, tname, namelen);
temp_string[namelen] = ' ';
memcpy (temp_string + namelen + 1, string, string_length + 1);
/* Don't import function names that are invalid identifiers from the
environment in posix mode, though we still allow them to be defined as
shell variables. */
if (absolute_program (tname) == 0 && (posixly_correct == 0 || legal_identifier (tname)))
parse_and_execute (temp_string, tname, SEVAL_NONINT|SEVAL_NOHIST|SEVAL_FUNCDEF|SEVAL_ONECMD);
else
free (temp_string); /* parse_and_execute does this */
if (temp_var = find_function (tname))
{
VSETATTR (temp_var, (att_exported|att_imported));
array_needs_making = 1;
}
else
{
if (temp_var = bind_invalid_envvar (name, string, 0))
{
VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
array_needs_making = 1;
}
last_command_exit_value = EXECUTION_FAILURE;
report_error (_("error importing function definition for `%s'"), tname);
}
/* Restore original suffix */
tname[namelen] = BASHFUNC_SUFFIX[0];
}
else
#endif /* FUNCTION_IMPORT */
#if defined (ARRAY_VARS)
# if ARRAY_EXPORT
/* Array variables may not yet be exported. */
if (*string == '(' && string[1] == '[' && string[strlen (string) - 1] == ')')
{
string_length = 1;
temp_string = extract_array_assignment_list (string, &string_length);
temp_var = assign_array_from_string (name, temp_string, 0);
FREE (temp_string);
VSETATTR (temp_var, (att_exported | att_imported));
array_needs_making = 1;
}
else
# endif /* ARRAY_EXPORT */
#endif
{
ro = 0;
/* If we processed a command-line option that caused SHELLOPTS to be
set, it may already be set (and read-only) by the time we process
the shell's environment. */
if (/* posixly_correct &&*/ STREQ (name, "SHELLOPTS"))
{
temp_var = find_variable ("SHELLOPTS");
ro = temp_var && readonly_p (temp_var);
if (temp_var)
VUNSETATTR (temp_var, att_readonly);
}
if (legal_identifier (name))
{
temp_var = bind_variable (name, string, 0);
if (temp_var)
{
VSETATTR (temp_var, (att_exported | att_imported));
if (ro)
VSETATTR (temp_var, att_readonly);
}
}
else
{
temp_var = bind_invalid_envvar (name, string, 0);
if (temp_var)
VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
}
if (temp_var)
array_needs_making = 1;
}
name[char_index] = '=';
/* temp_var can be NULL if it was an exported function with a syntax
error (a different bug, but it still shouldn't dump core). */
if (temp_var && function_p (temp_var) == 0) /* XXX not yet */
{
CACHE_IMPORTSTR (temp_var, name);
}
}
set_pwd ();
/* Set up initial value of $_ */
temp_var = set_if_not ("_", dollar_vars[0]);
/* Remember this pid. */
dollar_dollar_pid = getpid ();
/* Now make our own defaults in case the vars that we think are
important are missing. */
temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE);
temp_var = set_if_not ("TERM", "dumb");
#if defined (__QNX__)
/* set node id -- don't import it from the environment */
{
char node_name[22];
# if defined (__QNXNTO__)
netmgr_ndtostr(ND2S_LOCAL_STR, ND_LOCAL_NODE, node_name, sizeof(node_name));
# else
qnx_nidtostr (getnid (), node_name, sizeof (node_name));
# endif
temp_var = bind_variable ("NODE", node_name, 0);
if (temp_var)
set_auto_export (temp_var);
}
#endif
/* set up the prompts. */
if (interactive_shell)
{
#if defined (PROMPT_STRING_DECODE)
set_if_not ("PS1", primary_prompt);
#else
if (current_user.uid == -1)
get_current_user_info ();
set_if_not ("PS1", current_user.euid == 0 ? "# " : primary_prompt);
#endif
set_if_not ("PS2", secondary_prompt);
}
if (current_user.euid == 0)
bind_variable ("PS4", "+ ", 0);
else
set_if_not ("PS4", "+ ");
/* Don't allow IFS to be imported from the environment. */
temp_var = bind_variable ("IFS", " \t\n", 0);
setifs (temp_var);
/* Magic machine types. Pretty convenient. */
set_machine_vars ();
/* Default MAILCHECK for interactive shells. Defer the creation of a
default MAILPATH until the startup files are read, because MAIL
names a mail file if MAILPATH is not set, and we should provide a
default only if neither is set. */
if (interactive_shell)
{
temp_var = set_if_not ("MAILCHECK", posixly_correct ? "600" : "60");
VSETATTR (temp_var, att_integer);
}
/* Do some things with shell level. */
initialize_shell_level ();
set_ppid ();
set_argv0 ();
/* Initialize the `getopts' stuff. */
temp_var = bind_variable ("OPTIND", "1", 0);
VSETATTR (temp_var, att_integer);
getopts_reset (0);
bind_variable ("OPTERR", "1", 0);
sh_opterr = 1;
if (login_shell == 1 && posixly_correct == 0)
set_home_var ();
/* Get the full pathname to THIS shell, and set the BASH variable
to it. */
name = get_bash_name ();
temp_var = bind_variable ("BASH", name, 0);
free (name);
/* Make the exported environment variable SHELL be the user's login
shell. Note that the `tset' command looks at this variable
to determine what style of commands to output; if it ends in "csh",
then C-shell commands are output, else Bourne shell commands. */
set_shell_var ();
/* Make a variable called BASH_VERSION which contains the version info. */
bind_variable ("BASH_VERSION", shell_version_string (), 0);
#if defined (ARRAY_VARS)
make_vers_array ();
#endif
if (command_execution_string)
bind_variable ("BASH_EXECUTION_STRING", command_execution_string, 0);
/* Find out if we're supposed to be in Posix.2 mode via an
environment variable. */
temp_var = find_variable ("POSIXLY_CORRECT");
if (!temp_var)
temp_var = find_variable ("POSIX_PEDANTIC");
if (temp_var && imported_p (temp_var))
sv_strict_posix (temp_var->name);
#if defined (HISTORY)
/* Set history variables to defaults, and then do whatever we would
do if the variable had just been set. Do this only in the case
that we are remembering commands on the history list. */
if (remember_on_history)
{
name = bash_tilde_expand (posixly_correct ? "~/.sh_history" : "~/.bash_history", 0);
set_if_not ("HISTFILE", name);
free (name);
}
#endif /* HISTORY */
/* Seed the random number generators. */
seedrand ();
seedrand32 ();
/* Handle some "special" variables that we may have inherited from a
parent shell. */
if (interactive_shell)
{
temp_var = find_variable ("IGNOREEOF");
if (!temp_var)
temp_var = find_variable ("ignoreeof");
if (temp_var && imported_p (temp_var))
sv_ignoreeof (temp_var->name);
}
#if defined (HISTORY)
if (interactive_shell && remember_on_history)
{
sv_history_control ("HISTCONTROL");
sv_histignore ("HISTIGNORE");
sv_histtimefmt ("HISTTIMEFORMAT");
}
#endif /* HISTORY */
#if defined (READLINE) && defined (STRICT_POSIX)
/* POSIXLY_CORRECT will be 1 here if the shell was compiled
-DSTRICT_POSIX or if POSIXLY_CORRECT was supplied in the shell's
environment */
if (interactive_shell && posixly_correct && no_line_editing == 0)
rl_prefer_env_winsize = 1;
#endif /* READLINE && STRICT_POSIX */
/*
* 24 October 2001
*
* I'm tired of the arguing and bug reports. Bash now leaves SSH_CLIENT
* and SSH2_CLIENT alone. I'm going to rely on the shell_level check in
* isnetconn() to avoid running the startup files more often than wanted.
* That will, of course, only work if the user's login shell is bash, so
* I've made that behavior conditional on SSH_SOURCE_BASHRC being defined
* in config-top.h.
*/
#if 0
temp_var = find_variable ("SSH_CLIENT");
if (temp_var && imported_p (temp_var))
{
VUNSETATTR (temp_var, att_exported);
array_needs_making = 1;
}
temp_var = find_variable ("SSH2_CLIENT");
if (temp_var && imported_p (temp_var))
{
VUNSETATTR (temp_var, att_exported);
array_needs_making = 1;
}
#endif
/* Get the user's real and effective user ids. */
uidset ();
temp_var = find_variable ("BASH_XTRACEFD");
if (temp_var && imported_p (temp_var))
sv_xtracefd (temp_var->name);
sv_shcompat ("BASH_COMPAT");
/* Allow FUNCNEST to be inherited from the environment. */
sv_funcnest ("FUNCNEST");
/* Initialize the dynamic variables, and seed their values. */
initialize_dynamic_variables ();
}
/* **************************************************************** */
/* */
/* Setting values for special shell variables */
/* */
/* **************************************************************** */
static void
set_machine_vars ()
{
SHELL_VAR *temp_var;
temp_var = set_if_not ("HOSTTYPE", HOSTTYPE);
temp_var = set_if_not ("OSTYPE", OSTYPE);
temp_var = set_if_not ("MACHTYPE", MACHTYPE);
temp_var = set_if_not ("HOSTNAME", current_host_name);
}
/* Set $HOME to the information in the password file if we didn't get
it from the environment. */
/* This function is not static so the tilde and readline libraries can
use it. */
char *
sh_get_home_dir ()
{
if (current_user.home_dir == 0)
get_current_user_info ();
return current_user.home_dir;
}
static void
set_home_var ()
{
SHELL_VAR *temp_var;
temp_var = find_variable ("HOME");
if (temp_var == 0)
temp_var = bind_variable ("HOME", sh_get_home_dir (), 0);
#if 0
VSETATTR (temp_var, att_exported);
#endif
}
/* Set $SHELL to the user's login shell if it is not already set. Call
get_current_user_info if we haven't already fetched the shell. */
static void
set_shell_var ()
{
SHELL_VAR *temp_var;
temp_var = find_variable ("SHELL");
if (temp_var == 0)
{
if (current_user.shell == 0)
get_current_user_info ();
temp_var = bind_variable ("SHELL", current_user.shell, 0);
}
#if 0
VSETATTR (temp_var, att_exported);
#endif
}
static char *
get_bash_name ()
{
char *name;
if ((login_shell == 1) && RELPATH(shell_name))
{
if (current_user.shell == 0)
get_current_user_info ();
name = savestring (current_user.shell);
}
else if (ABSPATH(shell_name))
name = savestring (shell_name);
else if (shell_name[0] == '.' && shell_name[1] == '/')
{
/* Fast path for common case. */
char *cdir;
int len;
cdir = get_string_value ("PWD");
if (cdir)
{
len = strlen (cdir);
name = (char *)xmalloc (len + strlen (shell_name) + 1);
strcpy (name, cdir);
strcpy (name + len, shell_name + 1);
}
else
name = savestring (shell_name);
}
else
{
char *tname;
int s;
tname = find_user_command (shell_name);
if (tname == 0)
{
/* Try the current directory. If there is not an executable
there, just punt and use the login shell. */
s = file_status (shell_name);
if (s & FS_EXECABLE)
{
tname = make_absolute (shell_name, get_string_value ("PWD"));
if (*shell_name == '.')
{
name = sh_canonpath (tname, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
if (name == 0)
name = tname;
else
free (tname);
}
else
name = tname;
}
else
{
if (current_user.shell == 0)
get_current_user_info ();
name = savestring (current_user.shell);
}
}
else
{
name = full_pathname (tname);
free (tname);
}
}
return (name);
}
void
adjust_shell_level (change)
int change;
{
char new_level[5], *old_SHLVL;
intmax_t old_level;
SHELL_VAR *temp_var;
old_SHLVL = get_string_value ("SHLVL");
if (old_SHLVL == 0 || *old_SHLVL == '\0' || legal_number (old_SHLVL, &old_level) == 0)
old_level = 0;
shell_level = old_level + change;
if (shell_level < 0)
shell_level = 0;
else if (shell_level >= 1000)
{
internal_warning (_("shell level (%d) too high, resetting to 1"), shell_level);
shell_level = 1;
}
/* We don't need the full generality of itos here. */
if (shell_level < 10)
{
new_level[0] = shell_level + '0';
new_level[1] = '\0';
}
else if (shell_level < 100)
{
new_level[0] = (shell_level / 10) + '0';
new_level[1] = (shell_level % 10) + '0';
new_level[2] = '\0';
}
else if (shell_level < 1000)
{
new_level[0] = (shell_level / 100) + '0';
old_level = shell_level % 100;
new_level[1] = (old_level / 10) + '0';
new_level[2] = (old_level % 10) + '0';
new_level[3] = '\0';
}
temp_var = bind_variable ("SHLVL", new_level, 0);
set_auto_export (temp_var);
}
static void
initialize_shell_level ()
{
adjust_shell_level (1);
}
/* If we got PWD from the environment, update our idea of the current
working directory. In any case, make sure that PWD exists before
checking it. It is possible for getcwd () to fail on shell startup,
and in that case, PWD would be undefined. If this is an interactive
login shell, see if $HOME is the current working directory, and if
that's not the same string as $PWD, set PWD=$HOME. */
void
set_pwd ()
{
SHELL_VAR *temp_var, *home_var;
char *temp_string, *home_string, *current_dir;
home_var = find_variable ("HOME");
home_string = home_var ? value_cell (home_var) : (char *)NULL;
temp_var = find_variable ("PWD");
/* Follow posix rules for importing PWD */
if (temp_var && imported_p (temp_var) &&
(temp_string = value_cell (temp_var)) &&
temp_string[0] == '/' &&
same_file (temp_string, ".", (struct stat *)NULL, (struct stat *)NULL))
{
current_dir = sh_canonpath (temp_string, PATH_CHECKDOTDOT|PATH_CHECKEXISTS);
if (current_dir == 0)
current_dir = get_working_directory ("shell_init");
else
set_working_directory (current_dir);
if (posixly_correct && current_dir)
{
temp_var = bind_variable ("PWD", current_dir, 0);
set_auto_export (temp_var);
}
free (current_dir);
}
else if (home_string && interactive_shell && login_shell &&
same_file (home_string, ".", (struct stat *)NULL, (struct stat *)NULL))
{
set_working_directory (home_string);
temp_var = bind_variable ("PWD", home_string, 0);
set_auto_export (temp_var);
}
else
{
temp_string = get_working_directory ("shell-init");
if (temp_string)
{
temp_var = bind_variable ("PWD", temp_string, 0);
set_auto_export (temp_var);
free (temp_string);
}
}
/* According to the Single Unix Specification, v2, $OLDPWD is an
`environment variable' and therefore should be auto-exported. If we
don't find OLDPWD in the environment, or it doesn't name a directory,
make a dummy invisible variable for OLDPWD, and mark it as exported. */
temp_var = find_variable ("OLDPWD");
#if defined (OLDPWD_CHECK_DIRECTORY)
if (temp_var == 0 || value_cell (temp_var) == 0 || file_isdir (value_cell (temp_var)) == 0)
#else
if (temp_var == 0 || value_cell (temp_var) == 0)
#endif
{
temp_var = bind_variable ("OLDPWD", (char *)NULL, 0);
VSETATTR (temp_var, (att_exported | att_invisible));
}
}
/* Make a variable $PPID, which holds the pid of the shell's parent. */
void
set_ppid ()
{
char namebuf[INT_STRLEN_BOUND(pid_t) + 1], *name;
SHELL_VAR *temp_var;
name = inttostr (getppid (), namebuf, sizeof(namebuf));
temp_var = find_variable ("PPID");
if (temp_var)
VUNSETATTR (temp_var, (att_readonly | att_exported));
temp_var = bind_variable ("PPID", name, 0);
VSETATTR (temp_var, (att_readonly | att_integer));
}
static void
uidset ()
{
char buff[INT_STRLEN_BOUND(uid_t) + 1], *b;
register SHELL_VAR *v;
b = inttostr (current_user.uid, buff, sizeof (buff));
v = find_variable ("UID");
if (v == 0)
{
v = bind_variable ("UID", b, 0);
VSETATTR (v, (att_readonly | att_integer));
}
if (current_user.euid != current_user.uid)
b = inttostr (current_user.euid, buff, sizeof (buff));
v = find_variable ("EUID");
if (v == 0)
{
v = bind_variable ("EUID", b, 0);
VSETATTR (v, (att_readonly | att_integer));
}
}
#if defined (ARRAY_VARS)
static void
make_vers_array ()
{
SHELL_VAR *vv;
ARRAY *av;
char *s, d[32], b[INT_STRLEN_BOUND(int) + 1];
unbind_variable_noref ("BASH_VERSINFO");
vv = make_new_array_variable ("BASH_VERSINFO");
av = array_cell (vv);
strcpy (d, dist_version);
s = strchr (d, '.');
if (s)
*s++ = '\0';
array_insert (av, 0, d);
array_insert (av, 1, s);
s = inttostr (patch_level, b, sizeof (b));
array_insert (av, 2, s);
s = inttostr (build_version, b, sizeof (b));
array_insert (av, 3, s);
array_insert (av, 4, release_status);
array_insert (av, 5, MACHTYPE);