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variables.c
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/* variables.c -- Functions for hacking shell variables. */
/* Copyright (C) 1987-2016 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"
#define NEED_XTRACE_SET_DECL
#include "shell.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
extern char **environ;
/* Variables used here and defined in other files. */
extern int posixly_correct;
extern int line_number, line_number_base;
extern int subshell_environment, indirection_level, subshell_level;
extern int build_version, patch_level;
extern int expanding_redir;
extern int last_command_exit_value;
extern char *dist_version, *release_status;
extern char *shell_name;
extern char *primary_prompt, *secondary_prompt;
extern char *current_host_name;
extern sh_builtin_func_t *this_shell_builtin;
extern SHELL_VAR *this_shell_function;
extern char *the_printed_command_except_trap;
extern char *this_command_name;
extern char *command_execution_string;
extern time_t shell_start_time;
extern int assigning_in_environment;
extern int executing_builtin;
extern int funcnest_max;
#if defined (READLINE)
extern int no_line_editing;
extern int perform_hostname_completion;
#endif
/* 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;
#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;
/* 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;
/* 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 */
/* Some forward declarations. */
static void create_variable_tables __P((void));
static void set_machine_vars __P((void));
static void set_home_var __P((void));
static void set_shell_var __P((void));
static char *get_bash_name __P((void));
static void initialize_shell_level __P((void));
static void uidset __P((void));
#if defined (ARRAY_VARS)
static void make_vers_array __P((void));
#endif
static SHELL_VAR *null_assign __P((SHELL_VAR *, char *, arrayind_t, char *));
#if defined (ARRAY_VARS)
static SHELL_VAR *null_array_assign __P((SHELL_VAR *, char *, arrayind_t, char *));
#endif
static SHELL_VAR *get_self __P((SHELL_VAR *));
#if defined (ARRAY_VARS)
static SHELL_VAR *init_dynamic_array_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
static SHELL_VAR *init_dynamic_assoc_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
#endif
static SHELL_VAR *assign_seconds __P((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_seconds __P((SHELL_VAR *));
static SHELL_VAR *init_seconds_var __P((void));
static int brand __P((void));
static void sbrand __P((unsigned long)); /* set bash random number generator. */
static void seedrand __P((void)); /* seed generator randomly */
static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_random __P((SHELL_VAR *));
static SHELL_VAR *assign_lineno __P((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_lineno __P((SHELL_VAR *));
static SHELL_VAR *assign_subshell __P((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_subshell __P((SHELL_VAR *));
static SHELL_VAR *get_bashpid __P((SHELL_VAR *));
#if defined (HISTORY)
static SHELL_VAR *get_histcmd __P((SHELL_VAR *));
#endif
#if defined (READLINE)
static SHELL_VAR *get_comp_wordbreaks __P((SHELL_VAR *));
static SHELL_VAR *assign_comp_wordbreaks __P((SHELL_VAR *, char *, arrayind_t, char *));
#endif
#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
static SHELL_VAR *assign_dirstack __P((SHELL_VAR *, char *, arrayind_t, char *));
static SHELL_VAR *get_dirstack __P((SHELL_VAR *));
#endif
#if defined (ARRAY_VARS)
static SHELL_VAR *get_groupset __P((SHELL_VAR *));
static SHELL_VAR *build_hashcmd __P((SHELL_VAR *));
static SHELL_VAR *get_hashcmd __P((SHELL_VAR *));
static SHELL_VAR *assign_hashcmd __P((SHELL_VAR *, char *, arrayind_t, char *));
# if defined (ALIAS)
static SHELL_VAR *build_aliasvar __P((SHELL_VAR *));
static SHELL_VAR *get_aliasvar __P((SHELL_VAR *));
static SHELL_VAR *assign_aliasvar __P((SHELL_VAR *, char *, arrayind_t, char *));
# endif
#endif
static SHELL_VAR *get_funcname __P((SHELL_VAR *));
static SHELL_VAR *init_funcname_var __P((void));
static void initialize_dynamic_variables __P((void));
static SHELL_VAR *hash_lookup __P((const char *, HASH_TABLE *));
static SHELL_VAR *new_shell_variable __P((const char *));
static SHELL_VAR *make_new_variable __P((const char *, HASH_TABLE *));
static SHELL_VAR *bind_variable_internal __P((const char *, char *, HASH_TABLE *, int, int));
static void dispose_variable_value __P((SHELL_VAR *));
static void free_variable_hash_data __P((PTR_T));
static VARLIST *vlist_alloc __P((int));
static VARLIST *vlist_realloc __P((VARLIST *, int));
static void vlist_add __P((VARLIST *, SHELL_VAR *, int));
static void flatten __P((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int));
static int qsort_var_comp __P((SHELL_VAR **, SHELL_VAR **));
static SHELL_VAR **vapply __P((sh_var_map_func_t *));
static SHELL_VAR **fapply __P((sh_var_map_func_t *));
static int visible_var __P((SHELL_VAR *));
static int visible_and_exported __P((SHELL_VAR *));
static int export_environment_candidate __P((SHELL_VAR *));
static int local_and_exported __P((SHELL_VAR *));
static int variable_in_context __P((SHELL_VAR *));
#if defined (ARRAY_VARS)
static int visible_array_vars __P((SHELL_VAR *));
#endif
static SHELL_VAR *find_variable_internal __P((const char *, int));
static SHELL_VAR *find_nameref_at_context __P((SHELL_VAR *, VAR_CONTEXT *));
static SHELL_VAR *find_variable_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
static SHELL_VAR *find_variable_last_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
static SHELL_VAR *bind_tempenv_variable __P((const char *, char *));
static void push_temp_var __P((PTR_T));
static void propagate_temp_var __P((PTR_T));
static void dispose_temporary_env __P((sh_free_func_t *));
static inline char *mk_env_string __P((const char *, const char *, int));
static char **make_env_array_from_var_list __P((SHELL_VAR **));
static char **make_var_export_array __P((VAR_CONTEXT *));
static char **make_func_export_array __P((void));
static void add_temp_array_to_env __P((char **, int, int));
static int n_shell_variables __P((void));
static int set_context __P((SHELL_VAR *));
static void push_func_var __P((PTR_T));
static void push_exported_var __P((PTR_T));
static inline int find_special_var __P((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_variable (name, string, 0))
{
VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
array_needs_making = 1;
}
last_command_exit_value = 1;
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 (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);
}
temp_var = bind_variable (name, string, 0);
if (temp_var)
{
if (legal_identifier (name))
VSETATTR (temp_var, (att_exported | att_imported));
else
VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
if (ro)
VSETATTR (temp_var, att_readonly);
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);
#if 0
set_auto_export (temp_var); /* XXX */
#endif
temp_var = set_if_not ("TERM", "dumb");
#if 0
set_auto_export (temp_var); /* XXX */
#endif
#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 ();
/* 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 generator. */
seedrand ();
/* 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 only be 1 here if the shell was compiled
-DSTRICT_POSIX */
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);
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 (temp_var == 0 || value_cell (temp_var) == 0 || file_isdir (value_cell (temp_var)) == 0)
{
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);
VSETATTR (vv, att_readonly);
}
#endif /* ARRAY_VARS */
/* Set the environment variables $LINES and $COLUMNS in response to
a window size change. */
void
sh_set_lines_and_columns (lines, cols)
int lines, cols;
{
char val[INT_STRLEN_BOUND(int) + 1], *v;
#if defined (READLINE)
/* If we are currently assigning to LINES or COLUMNS, don't do anything. */
if (winsize_assignment)
return;
#endif
v = inttostr (lines, val, sizeof (val));
bind_variable ("LINES", v, 0);
v = inttostr (cols, val, sizeof (val));
bind_variable ("COLUMNS", v, 0);
}
/* **************************************************************** */
/* */