/* variables.c -- Functions for hacking shell variables. */
/* Copyright (C) 1987-2010 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 .
*/
#include "config.h"
#include "bashtypes.h"
#include "posixstat.h"
#include "posixtime.h"
#if defined (__QNX__)
# if defined (__QNXNTO__)
# include
# else
# include
# endif /* !__QNXNTO__ */
#endif /* __QNX__ */
#if defined (HAVE_UNISTD_H)
# include
#endif
#include
#include "chartypes.h"
#if defined (HAVE_PWD_H)
# include
#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 "builtins/getopt.h"
#include "builtins/common.h"
#if defined (READLINE)
# include "bashline.h"
# include
#else
# include
#endif
#if defined (HISTORY)
# include "bashhist.h"
# include
#endif /* HISTORY */
#if defined (PROGRAMMABLE_COMPLETION)
# include "pcomplete.h"
#endif
#define TEMPENV_HASH_BUCKETS 4 /* must be power of two */
#define ifsname(s) ((s)[0] == 'I' && (s)[1] == 'F' && (s)[2] == 'S' && (s)[3] == '\0')
#define BASHFUNC_PREFIX "BASH_FUNC_"
#define BASHFUNC_PREFLEN 10 /* == strlen(BASHFUNC_PREFIX */
#define BASHFUNC_SUFFIX "%%"
#define BASHFUNC_SUFFLEN 2 /* == strlen(BASHFUNC_SUFFIX) */
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 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
/* 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 *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 (0);
}
if (shell_functions == 0)
shell_functions = hash_create (0);
#if defined (DEBUGGER)
if (shell_function_defs == 0)
shell_function_defs = hash_create (0);
#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;
SHELL_VAR *temp_var;
create_variable_tables ();
for (string_index = 0; 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 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. */
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);
if (temp_var = find_function (tname))
{
VSETATTR (temp_var, (att_exported|att_imported));
array_needs_making = 1;
}
else
report_error (_("error importing function definition for `%s'"), tname);
/* Restore original suffix */
tname[namelen] = BASHFUNC_SUFFIX[0];
}
#if defined (ARRAY_VARS)
# if 0
/* Array variables may not yet be exported. */
else 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);
FREE (temp_string);
VSETATTR (temp_var, (att_exported | att_imported));
array_needs_making = 1;
}
# endif
#endif
#if 0
else if (legal_identifier (name))
#else
else
#endif
{
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));
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", "unknown");
#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);
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);
}
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);
#if 0
set_if_not ("HISTSIZE", "500");
sv_histsize ("HISTSIZE");
#endif
}
#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);
/* 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;
home_var = find_variable ("HOME");
home_string = home_var ? value_cell (home_var) : (char *)NULL;
temp_var = find_variable ("PWD");
if (temp_var && imported_p (temp_var) &&
(temp_string = value_cell (temp_var)) &&
same_file (temp_string, ".", (struct stat *)NULL, (struct stat *)NULL))
set_working_directory (temp_string);
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.
Make a dummy invisible variable for OLDPWD, and mark it as exported. */
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 ("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);
}
/* **************************************************************** */
/* */
/* Printing variables and values */
/* */
/* **************************************************************** */
/* Print LIST (a list of shell variables) to stdout in such a way that
they can be read back in. */
void
print_var_list (list)
register SHELL_VAR **list;
{
register int i;
register SHELL_VAR *var;
for (i = 0; list && (var = list[i]); i++)
if (invisible_p (var) == 0)
print_assignment (var);
}
/* Print LIST (a list of shell functions) to stdout in such a way that
they can be read back in. */
void
print_func_list (list)
register SHELL_VAR **list;
{
register int i;
register SHELL_VAR *var;
for (i = 0; list && (var = list[i]); i++)
{
printf ("%s ", var->name);
print_var_function (var);
printf ("\n");
}
}
/* Print the value of a single SHELL_VAR. No newline is
output, but the variable is printed in such a way that
it can be read back in. */
void
print_assignment (var)
SHELL_VAR *var;
{
if (var_isset (var) == 0)
return;
if (function_p (var))
{
printf ("%s", var->name);
print_var_function (var);
printf ("\n");
}
#if defined (ARRAY_VARS)
else if (array_p (var))
print_array_assignment (var, 0);
else if (assoc_p (var))
print_assoc_assignment (var, 0);
#endif /* ARRAY_VARS */
else
{
printf ("%s=", var->name);
print_var_value (var, 1);
printf ("\n");
}
}
/* Print the value cell of VAR, a shell variable. Do not print
the name, nor leading/trailing newline. If QUOTE is non-zero,
and the value contains shell metacharacters, quote the value
in such a way that it can be read back in. */
void
print_var_value (var, quote)
SHELL_VAR *var;
int quote;
{
char *t;
if (var_isset (var) == 0)
return;
if (quote && posixly_correct == 0 && ansic_shouldquote (value_cell (var)))
{
t = ansic_quote (value_cell (var), 0, (int *)0);
printf ("%s", t);
free (t);
}
else if (quote && sh_contains_shell_metas (value_cell (var)))
{
t = sh_single_quote (value_cell (var));
printf ("%s", t);
free (t);
}
else
printf ("%s", value_cell (var));
}
/* Print the function cell of VAR, a shell variable. Do not
print the name, nor leading/trailing newline. */
void
print_var_function (var)
SHELL_VAR *var;
{
char *x;
if (function_p (var) && var_isset (var))
{
x = named_function_string ((char *)NULL, function_cell(var), FUNC_MULTILINE|FUNC_EXTERNAL);
printf ("%s", x);
}
}
/* **************************************************************** */
/* */
/* Dynamic Variables */
/* */
/* **************************************************************** */
/* DYNAMIC VARIABLES
These are variables whose values are generated anew each time they are
referenced. These are implemented using a pair of function pointers
in the struct variable: assign_func, which is called from bind_variable
and, if arrays are compiled into the shell, some of the functions in
arrayfunc.c, and dynamic_value, which is called from find_variable.
assign_func is called from bind_variable_internal, if
bind_variable_internal discovers that the variable being assigned to
has such a function. The function is called as
SHELL_VAR *temp = (*(entry->assign_func)) (entry, value, ind)
and the (SHELL_VAR *)temp is returned as the value of bind_variable. It
is usually ENTRY (self). IND is an index for an array variable, and
unused otherwise.
dynamic_value is called from find_variable_internal to return a `new'
value for the specified dynamic varible. If this function is NULL,
the variable is treated as a `normal' shell variable. If it is not,
however, then this function is called like this:
tempvar = (*(var->dynamic_value)) (var);
Sometimes `tempvar' will replace the value of `var'. Other times, the
shell will simply use the string value. Pretty object-oriented, huh?
Be warned, though: if you `unset' a special variable, it loses its
special meaning, even if you subsequently set it.
The special assignment code would probably have been better put in
subst.c: do_assignment_internal, in the same style as
stupidly_hack_special_variables, but I wanted the changes as
localized as possible. */
#define INIT_DYNAMIC_VAR(var, val, gfunc, afunc) \
do \
{ \
v = bind_variable (var, (val), 0); \
v->dynamic_value = gfunc; \
v->assign_func = afunc; \
} \
while (0)
#define INIT_DYNAMIC_ARRAY_VAR(var, gfunc, afunc) \
do \
{ \
v = make_new_array_variable (var); \
v->dynamic_value = gfunc; \
v->assign_func = afunc; \
} \
while (0)
#define INIT_DYNAMIC_ASSOC_VAR(var, gfunc, afunc) \
do \
{ \
v = make_new_assoc_variable (var); \
v->dynamic_value = gfunc; \
v->assign_func = afunc; \
} \
while (0)
static SHELL_VAR *
null_assign (self, value, unused, key)
SHELL_VAR *self;
char *value;
arrayind_t unused;
char *key;
{
return (self);
}
#if defined (ARRAY_VARS)
static SHELL_VAR *
null_array_assign (self, value, ind, key)
SHELL_VAR *self;
char *value;
arrayind_t ind;
char *key;
{
return (self);
}
#endif
/* Degenerate `dynamic_value' function; just returns what's passed without
manipulation. */
static SHELL_VAR *
get_self (self)
SHELL_VAR *self;
{
return (self);
}
#if defined (ARRAY_VARS)
/* A generic dynamic array variable initializer. Intialize array variable
NAME with dynamic value function GETFUNC and assignment function SETFUNC. */
static SHELL_VAR *
init_dynamic_array_var (name, getfunc, setfunc, attrs)
char *name;
sh_var_value_func_t *getfunc;
sh_var_assign_func_t *setfunc;
int attrs;
{
SHELL_VAR *v;
v = find_variable (name);
if (v)
return (v);
INIT_DYNAMIC_ARRAY_VAR (name, getfunc, setfunc);
if (attrs)
VSETATTR (v, attrs);
return v;
}
static SHELL_VAR *
init_dynamic_assoc_var (name, getfunc, setfunc, attrs)
char *name;
sh_var_value_func_t *getfunc;
sh_var_assign_func_t *setfunc;
int attrs;
{
SHELL_VAR *v;
v = find_variable (name);
if (v)
return (v);
INIT_DYNAMIC_ASSOC_VAR (name, getfunc, setfunc);
if (attrs)
VSETATTR (v, attrs);
return v;
}
#endif
/* The value of $SECONDS. This is the number of seconds since shell
invocation, or, the number of seconds since the last assignment + the
value of the last assignment. */
static intmax_t seconds_value_assigned;
static SHELL_VAR *
assign_seconds (self, value, unused, key)
SHELL_VAR *self;
char *value;
arrayind_t unused;
char *key;
{
if (legal_number (value, &seconds_value_assigned) == 0)
seconds_value_assigned = 0;
shell_start_time = NOW;
return (self);
}
static SHELL_VAR *
get_seconds (var)
SHELL_VAR *var;
{
time_t time_since_start;
char *p;
time_since_start = NOW - shell_start_time;
p = itos(seconds_value_assigned + time_since_start);
FREE (value_cell (var));
VSETATTR (var, att_integer);
var_setvalue (var, p);
return (var);
}
static SHELL_VAR *
init_seconds_var ()
{
SHELL_VAR *v;
v = find_variable ("SECONDS");
if (v)
{
if (legal_number (value_cell(v), &seconds_value_assigned) == 0)
seconds_value_assigned = 0;
}
INIT_DYNAMIC_VAR ("SECONDS", (v ? value_cell (v) : (char *)NULL), get_seconds, assign_seconds);
return v;
}
/* The random number seed. You can change this by setting RANDOM. */
static unsigned long rseed = 1;
static int last_random_value;
static int seeded_subshell = 0;
/* A linear congruential random number generator based on the example
one in the ANSI C standard. This one isn't very good, but a more
complicated one is overkill. */
/* Returns a pseudo-random number between 0 and 32767. */
static int
brand ()
{
/* From "Random number generators: good ones are hard to find",
Park and Miller, Communications of the ACM, vol. 31, no. 10,
October 1988, p. 1195. filtered through FreeBSD */
long h, l;
/* Can't seed with 0. */
if (rseed == 0)
rseed = 123459876;
h = rseed / 127773;
l = rseed % 127773;
rseed = 16807 * l - 2836 * h;
#if 0
if (rseed < 0)
rseed += 0x7fffffff;
#endif
return ((unsigned int)(rseed & 32767)); /* was % 32768 */
}
/* Set the random number generator seed to SEED. */
static void
sbrand (seed)
unsigned long seed;
{
rseed = seed;
last_random_value = 0;
}
static void
seedrand ()
{
struct timeval tv;
gettimeofday (&tv, NULL);
sbrand (tv.tv_sec ^ tv.tv_usec ^ getpid ());
}
static SHELL_VAR *
assign_random (self, value, unused, key)
SHELL_VAR *self;
char *value;
arrayind_t unused;
char *key;
{
sbrand (strtoul (value, (char **)NULL, 10));
if (subshell_environment)
seeded_subshell = getpid ();
return (self);
}
int
get_random_number ()
{
int rv, pid;
/* Reset for command and process substitution. */
pid = getpid ();
if (subshell_environment && seeded_subshell != pid)
{
seedrand ();
seeded_subshell = pid;
}
do
rv = brand ();
while (rv == last_random_value);
return rv;
}
static SHELL_VAR *
get_random (var)
SHELL_VAR *var;
{
int rv;
char *p;
rv = get_random_number ();
last_random_value = rv;
p = itos (rv);
FREE (value_cell (var));
VSETATTR (var, att_integer);
var_setvalue (var, p);
return (var);
}
static SHELL_VAR *
assign_lineno (var, value, unused, key)
SHELL_VAR *var;
char *value;
arrayind_t unused;
char *key;
{
intmax_t new_value;
if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0)
new_value = 0;
line_number = line_number_base = new_value;
return var;
}
/* Function which returns the current line number. */
static SHELL_VAR *
get_lineno (var)
SHELL_VAR *var;
{
char *p;
int ln;
ln = executing_line_number ();
p = itos (ln);
FREE (value_cell (var));
var_setvalue (var, p);
return (var);
}
static SHELL_VAR *
assign_subshell (var, value, unused, key)
SHELL_VAR *var;
char *value;
arrayind_t unused;
char *key;
{
intmax_t new_value;
if (value == 0 || *value == '\0' || legal_number (value, &new_value) == 0)
new_value = 0;
subshell_level = new_value;
return var;
}
static SHELL_VAR *
get_subshell (var)
SHELL_VAR *var;
{
char *p;
p = itos (subshell_level);
FREE (value_cell (var));
var_setvalue (var, p);
return (var);
}
static SHELL_VAR *
get_bashpid (var)
SHELL_VAR *var;
{
int pid;
char *p;
pid = getpid ();
p = itos (pid);
FREE (value_cell (var));
VSETATTR (var, att_integer|att_readonly);
var_setvalue (var, p);
return (var);
}
static SHELL_VAR *
get_bash_command (var)
SHELL_VAR *var;
{
char *p;
if (the_printed_command_except_trap)
p = savestring (the_printed_command_except_trap);
else
{
p = (char *)xmalloc (1);
p[0] = '\0';
}
FREE (value_cell (var));
var_setvalue (var, p);
return (var);
}
#if defined (HISTORY)
static SHELL_VAR *
get_histcmd (var)
SHELL_VAR *var;
{
char *p;
p = itos (history_number ());
FREE (value_cell (var));
var_setvalue (var, p);
return (var);
}
#endif
#if defined (READLINE)
/* When this function returns, VAR->value points to malloced memory. */
static SHELL_VAR *
get_comp_wordbreaks (var)
SHELL_VAR *var;
{
/* If we don't have anything yet, assign a default value. */
if (rl_completer_word_break_characters == 0 && bash_readline_initialized == 0)
enable_hostname_completion (perform_hostname_completion);
FREE (value_cell (var));
var_setvalue (var, savestring (rl_completer_word_break_characters));
return (var);
}
/* When this function returns, rl_completer_word_break_characters points to
malloced memory. */
static SHELL_VAR *
assign_comp_wordbreaks (self, value, unused, key)
SHELL_VAR *self;
char *value;
arrayind_t unused;
char *key;
{
if (rl_completer_word_break_characters &&
rl_completer_word_break_characters != rl_basic_word_break_characters)
free (rl_completer_word_break_characters);
rl_completer_word_break_characters = savestring (value);
return self;
}
#endif /* READLINE */
#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
static SHELL_VAR *
assign_dirstack (self, value, ind, key)
SHELL_VAR *self;
char *value;
arrayind_t ind;
char *key;
{
set_dirstack_element (ind, 1, value);
return self;
}
static SHELL_VAR *
get_dirstack (self)
SHELL_VAR *self;
{
ARRAY *a;
WORD_LIST *l;
l = get_directory_stack (0);
a = array_from_word_list (l);
array_dispose (array_cell (self));
dispose_words (l);
var_setarray (self, a);
return self;
}
#endif /* PUSHD AND POPD && ARRAY_VARS */
#if defined (ARRAY_VARS)
/* We don't want to initialize the group set with a call to getgroups()
unless we're asked to, but we only want to do it once. */
static SHELL_VAR *
get_groupset (self)
SHELL_VAR *self;
{
register int i;
int ng;
ARRAY *a;
static char **group_set = (char **)NULL;
if (group_set == 0)
{
group_set = get_group_list (&ng);
a = array_cell (self);
for (i = 0; i < ng; i++)
array_insert (a, i, group_set[i]);
}
return (self);
}
static SHELL_VAR *
build_hashcmd (self)
SHELL_VAR *self;
{
HASH_TABLE *h;
int i;
char *k, *v;
BUCKET_CONTENTS *item;
h = assoc_cell (self);
if (h)
assoc_dispose (h);
if (hashed_filenames == 0 || HASH_ENTRIES (hashed_filenames) == 0)
{
var_setvalue (self, (char *)NULL);
return self;
}
h = assoc_create (hashed_filenames->nbuckets);
for (i = 0; i < hashed_filenames->nbuckets; i++)
{
for (item = hash_items (i, hashed_filenames); item; item = item->next)
{
k = savestring (item->key);
v = pathdata(item)->path;
assoc_insert (h, k, v);
}
}
var_setvalue (self, (char *)h);
return self;
}
static SHELL_VAR *
get_hashcmd (self)
SHELL_VAR *self;
{
build_hashcmd (self);
return (self);
}
static SHELL_VAR *
assign_hashcmd (self, value, ind, key)
SHELL_VAR *self;
char *value;
arrayind_t ind;
char *key;
{
phash_insert (key, value, 0, 0);
return (build_hashcmd (self));
}
#if defined (ALIAS)
static SHELL_VAR *
build_aliasvar (self)
SHELL_VAR *self;
{
HASH_TABLE *h;
int i;
char *k, *v;
BUCKET_CONTENTS *item;
h = assoc_cell (self);
if (h)
assoc_dispose (h);
if (aliases == 0 || HASH_ENTRIES (aliases) == 0)
{
var_setvalue (self, (char *)NULL);
return self;
}
h = assoc_create (aliases->nbuckets);
for (i = 0; i < aliases->nbuckets; i++)
{
for (item = hash_items (i, aliases); item; item = item->next)
{
k = savestring (item->key);
v = ((alias_t *)(item->data))->value;
assoc_insert (h, k, v);
}
}
var_setvalue (self, (char *)h);
return self;
}
static SHELL_VAR *
get_aliasvar (self)
SHELL_VAR *self;
{
build_aliasvar (self);
return (self);
}
static SHELL_VAR *
assign_aliasvar (self, value, ind, key)
SHELL_VAR *self;
char *value;
arrayind_t ind;
char *key;
{
add_alias (key, value);
return (build_aliasvar (self));
}
#endif /* ALIAS */
#endif /* ARRAY_VARS */
/* If ARRAY_VARS is not defined, this just returns the name of any
currently-executing function. If we have arrays, it's a call stack. */
static SHELL_VAR *
get_funcname (self)
SHELL_VAR *self;
{
#if ! defined (ARRAY_VARS)
char *t;
if (variable_context && this_shell_function)
{
FREE (value_cell (self));
t = savestring (this_shell_function->name);
var_setvalue (self, t);
}
#endif
return (self);
}
void
make_funcname_visible (on_or_off)
int on_or_off;
{
SHELL_VAR *v;
v = find_variable ("FUNCNAME");
if (v == 0 || v->dynamic_value == 0)
return;
if (on_or_off)
VUNSETATTR (v, att_invisible);
else
VSETATTR (v, att_invisible);
}
static SHELL_VAR *
init_funcname_var ()
{
SHELL_VAR *v;
v = find_variable ("FUNCNAME");
if (v)
return v;
#if defined (ARRAY_VARS)
INIT_DYNAMIC_ARRAY_VAR ("FUNCNAME", get_funcname, null_array_assign);
#else
INIT_DYNAMIC_VAR ("FUNCNAME", (char *)NULL, get_funcname, null_assign);
#endif
VSETATTR (v, att_invisible|att_noassign);
return v;
}
static void
initialize_dynamic_variables ()
{
SHELL_VAR *v;
v = init_seconds_var ();
INIT_DYNAMIC_VAR ("BASH_COMMAND", (char *)NULL, get_bash_command, (sh_var_assign_func_t *)NULL);
INIT_DYNAMIC_VAR ("BASH_SUBSHELL", (char *)NULL, get_subshell, assign_subshell);
INIT_DYNAMIC_VAR ("RANDOM", (char *)NULL, get_random, assign_random);
VSETATTR (v, att_integer);
INIT_DYNAMIC_VAR ("LINENO", (char *)NULL, get_lineno, assign_lineno);
VSETATTR (v, att_integer);
INIT_DYNAMIC_VAR ("BASHPID", (char *)NULL, get_bashpid, null_assign);
VSETATTR (v, att_integer|att_readonly);
#if defined (HISTORY)
INIT_DYNAMIC_VAR ("HISTCMD", (char *)NULL, get_histcmd, (sh_var_assign_func_t *)NULL);
VSETATTR (v, att_integer);
#endif
#if defined (READLINE)
INIT_DYNAMIC_VAR ("COMP_WORDBREAKS", (char *)NULL, get_comp_wordbreaks, assign_comp_wordbreaks);
#endif
#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
v = init_dynamic_array_var ("DIRSTACK", get_dirstack, assign_dirstack, 0);
#endif /* PUSHD_AND_POPD && ARRAY_VARS */
#if defined (ARRAY_VARS)
v = init_dynamic_array_var ("GROUPS", get_groupset, null_array_assign, att_noassign);
# if defined (DEBUGGER)
v = init_dynamic_array_var ("BASH_ARGC", get_self, null_array_assign, att_noassign|att_nounset);
v = init_dynamic_array_var ("BASH_ARGV", get_self, null_array_assign, att_noassign|att_nounset);
# endif /* DEBUGGER */
v = init_dynamic_array_var ("BASH_SOURCE", get_self, null_array_assign, att_noassign|att_nounset);
v = init_dynamic_array_var ("BASH_LINENO", get_self, null_array_assign, att_noassign|att_nounset);
v = init_dynamic_assoc_var ("BASH_CMDS", get_hashcmd, assign_hashcmd, att_nofree);
# if defined (ALIAS)
v = init_dynamic_assoc_var ("BASH_ALIASES", get_aliasvar, assign_aliasvar, att_nofree);
# endif
#endif
v = init_funcname_var ();
}
/* **************************************************************** */
/* */
/* Retrieving variables and values */
/* */
/* **************************************************************** */
/* How to get a pointer to the shell variable or function named NAME.
HASHED_VARS is a pointer to the hash table containing the list
of interest (either variables or functions). */
static SHELL_VAR *
hash_lookup (name, hashed_vars)
const char *name;
HASH_TABLE *hashed_vars;
{
BUCKET_CONTENTS *bucket;
bucket = hash_search (name, hashed_vars, 0);
return (bucket ? (SHELL_VAR *)bucket->data : (SHELL_VAR *)NULL);
}
SHELL_VAR *
var_lookup (name, vcontext)
const char *name;
VAR_CONTEXT *vcontext;
{
VAR_CONTEXT *vc;
SHELL_VAR *v;
v = (SHELL_VAR *)NULL;
for (vc = vcontext; vc; vc = vc->down)
if (v = hash_lookup (name, vc->table))
break;
return v;
}
/* Look up the variable entry named NAME. If SEARCH_TEMPENV is non-zero,
then also search the temporarily built list of exported variables.
The lookup order is:
temporary_env
shell_variables list
*/
SHELL_VAR *
find_variable_internal (name, force_tempenv)
const char *name;
int force_tempenv;
{
SHELL_VAR *var;
int search_tempenv;
var = (SHELL_VAR *)NULL;
/* If explicitly requested, first look in the temporary environment for
the variable. This allows constructs such as "foo=x eval 'echo $foo'"
to get the `exported' value of $foo. This happens if we are executing
a function or builtin, or if we are looking up a variable in a
"subshell environment". */
search_tempenv = force_tempenv || (expanding_redir == 0 && subshell_environment);
if (search_tempenv && temporary_env)
var = hash_lookup (name, temporary_env);
if (var == 0)
var = var_lookup (name, shell_variables);
if (var == 0)
return ((SHELL_VAR *)NULL);
return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
}
SHELL_VAR *
find_global_variable (name)
const char *name;
{
SHELL_VAR *var;
var = var_lookup (name, global_variables);
if (var == 0)
return ((SHELL_VAR *)NULL);
return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
}
/* Look up the variable entry named NAME. Returns the entry or NULL. */
SHELL_VAR *
find_variable (name)
const char *name;
{
return (find_variable_internal (name, (expanding_redir == 0 && (assigning_in_environment || executing_builtin))));
}
/* Look up the function entry whose name matches STRING.
Returns the entry or NULL. */
SHELL_VAR *
find_function (name)
const char *name;
{
return (hash_lookup (name, shell_functions));
}
/* Find the function definition for the shell function named NAME. Returns
the entry or NULL. */
FUNCTION_DEF *
find_function_def (name)
const char *name;
{
#if defined (DEBUGGER)
return ((FUNCTION_DEF *)hash_lookup (name, shell_function_defs));
#else
return ((FUNCTION_DEF *)0);
#endif
}
/* Return the value of VAR. VAR is assumed to have been the result of a
lookup without any subscript, if arrays are compiled into the shell. */
char *
get_variable_value (var)
SHELL_VAR *var;
{
if (var == 0)
return ((char *)NULL);
#if defined (ARRAY_VARS)
else if (array_p (var))
return (array_reference (array_cell (var), 0));
else if (assoc_p (var))
return (assoc_reference (assoc_cell (var), "0"));
#endif
else
return (value_cell (var));
}
/* Return the string value of a variable. Return NULL if the variable
doesn't exist. Don't cons a new string. This is a potential memory
leak if the variable is found in the temporary environment. Since
functions and variables have separate name spaces, returns NULL if
var_name is a shell function only. */
char *
get_string_value (var_name)
const char *var_name;
{
SHELL_VAR *var;
var = find_variable (var_name);
return ((var) ? get_variable_value (var) : (char *)NULL);
}
/* This is present for use by the tilde and readline libraries. */
char *
sh_get_env_value (v)
const char *v;
{
return get_string_value (v);
}
/* **************************************************************** */
/* */
/* Creating and setting variables */
/* */
/* **************************************************************** */
/* Set NAME to VALUE if NAME has no value. */
SHELL_VAR *
set_if_not (name, value)
char *name, *value;
{
SHELL_VAR *v;
if (shell_variables == 0)
create_variable_tables ();
v = find_variable (name);
if (v == 0)
v = bind_variable_internal (name, value, global_variables->table, HASH_NOSRCH, 0);
return (v);
}
/* Create a local variable referenced by NAME. */
SHELL_VAR *
make_local_variable (name)
const char *name;
{
SHELL_VAR *new_var, *old_var;
VAR_CONTEXT *vc;
int was_tmpvar;
char *tmp_value;
/* local foo; local foo; is a no-op. */
old_var = find_variable (name);
if (old_var && local_p (old_var) && old_var->context == variable_context)
{
VUNSETATTR (old_var, att_invisible);
return (old_var);
}
was_tmpvar = old_var && tempvar_p (old_var);
if (was_tmpvar)
tmp_value = value_cell (old_var);
for (vc = shell_variables; vc; vc = vc->down)
if (vc_isfuncenv (vc) && vc->scope == variable_context)
break;
if (vc == 0)
{
internal_error (_("make_local_variable: no function context at current scope"));
return ((SHELL_VAR *)NULL);
}
else if (vc->table == 0)
vc->table = hash_create (TEMPENV_HASH_BUCKETS);
/* Since this is called only from the local/declare/typeset code, we can
call builtin_error here without worry (of course, it will also work
for anything that sets this_command_name). Variables with the `noassign'
attribute may not be made local. The test against old_var's context
level is to disallow local copies of readonly global variables (since I
believe that this could be a security hole). Readonly copies of calling
function local variables are OK. */
if (old_var && (noassign_p (old_var) ||
(readonly_p (old_var) && old_var->context == 0)))
{
if (readonly_p (old_var))
sh_readonly (name);
return ((SHELL_VAR *)NULL);
}
if (old_var == 0)
new_var = make_new_variable (name, vc->table);
else
{
new_var = make_new_variable (name, vc->table);
/* If we found this variable in one of the temporary environments,
inherit its value. Watch to see if this causes problems with
things like `x=4 local x'. */
if (was_tmpvar)
var_setvalue (new_var, savestring (tmp_value));
new_var->attributes = exported_p (old_var) ? att_exported : 0;
}
vc->flags |= VC_HASLOCAL;
new_var->context = variable_context;
VSETATTR (new_var, att_local);
if (ifsname (name))
setifs (new_var);
return (new_var);
}
/* Create a new shell variable with name NAME. */
static SHELL_VAR *
new_shell_variable (name)
const char *name;
{
SHELL_VAR *entry;
entry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR));
entry->name = savestring (name);
var_setvalue (entry, (char *)NULL);
CLEAR_EXPORTSTR (entry);
entry->dynamic_value = (sh_var_value_func_t *)NULL;
entry->assign_func = (sh_var_assign_func_t *)NULL;
entry->attributes = 0;
/* Always assume variables are to be made at toplevel!
make_local_variable has the responsibilty of changing the
variable context. */
entry->context = 0;
return (entry);
}
/* Create a new shell variable with name NAME and add it to the hash table
TABLE. */
static SHELL_VAR *
make_new_variable (name, table)
const char *name;
HASH_TABLE *table;
{
SHELL_VAR *entry;
BUCKET_CONTENTS *elt;
entry = new_shell_variable (name);
/* Make sure we have a shell_variables hash table to add to. */
if (shell_variables == 0)
create_variable_tables ();
elt = hash_insert (savestring (name), table, HASH_NOSRCH);
elt->data = (PTR_T)entry;
return entry;
}
#if defined (ARRAY_VARS)
SHELL_VAR *
make_new_array_variable (name)
char *name;
{
SHELL_VAR *entry;
ARRAY *array;
entry = make_new_variable (name, global_variables->table);
array = array_create ();
var_setarray (entry, array);
VSETATTR (entry, att_array);
return entry;
}
SHELL_VAR *
make_local_array_variable (name)
char *name;
{
SHELL_VAR *var;
ARRAY *array;
var = make_local_variable (name);
if (var == 0 || array_p (var))
return var;
array = array_create ();
dispose_variable_value (var);
var_setarray (var, array);
VSETATTR (var, att_array);
return var;
}
SHELL_VAR *
make_new_assoc_variable (name)
char *name;
{
SHELL_VAR *entry;
HASH_TABLE *hash;
entry = make_new_variable (name, global_variables->table);
hash = assoc_create (0);
var_setassoc (entry, hash);
VSETATTR (entry, att_assoc);
return entry;
}
SHELL_VAR *
make_local_assoc_variable (name)
char *name;
{
SHELL_VAR *var;
HASH_TABLE *hash;
var = make_local_variable (name);
if (var == 0 || assoc_p (var))
return var;
dispose_variable_value (var);
hash = assoc_create (0);
var_setassoc (var, hash);
VSETATTR (var, att_assoc);
return var;
}
#endif
char *
make_variable_value (var, value, flags)
SHELL_VAR *var;
char *value;
int flags;
{
char *retval, *oval;
intmax_t lval, rval;
int expok, olen, op;
/* If this variable has had its type set to integer (via `declare -i'),
then do expression evaluation on it and store the result. The
functions in expr.c (evalexp()) and bind_int_variable() are responsible
for turning off the integer flag if they don't want further
evaluation done. */
if (integer_p (var))
{
if (flags & ASS_APPEND)
{
oval = value_cell (var);
lval = evalexp (oval, &expok); /* ksh93 seems to do this */
if (expok == 0)
{
top_level_cleanup ();
jump_to_top_level (DISCARD);
}
}
rval = evalexp (value, &expok);
if (expok == 0)
{
top_level_cleanup ();
jump_to_top_level (DISCARD);
}
if (flags & ASS_APPEND)
rval += lval;
retval = itos (rval);
}
#if defined (CASEMOD_ATTRS)
else if (capcase_p (var) || uppercase_p (var) || lowercase_p (var))
{
if (flags & ASS_APPEND)
{
oval = get_variable_value (var);
if (oval == 0) /* paranoia */
oval = "";
olen = STRLEN (oval);
retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1);
strcpy (retval, oval);
if (value)
strcpy (retval+olen, value);
}
else if (*value)
retval = savestring (value);
else
{
retval = (char *)xmalloc (1);
retval[0] = '\0';
}
op = capcase_p (var) ? CASE_CAPITALIZE
: (uppercase_p (var) ? CASE_UPPER : CASE_LOWER);
oval = sh_modcase (retval, (char *)0, op);
free (retval);
retval = oval;
}
#endif /* CASEMOD_ATTRS */
else if (value)
{
if (flags & ASS_APPEND)
{
oval = get_variable_value (var);
if (oval == 0) /* paranoia */
oval = "";
olen = STRLEN (oval);
retval = (char *)xmalloc (olen + (value ? STRLEN (value) : 0) + 1);
strcpy (retval, oval);
if (value)
strcpy (retval+olen, value);
}
else if (*value)
retval = savestring (value);
else
{
retval = (char *)xmalloc (1);
retval[0] = '\0';
}
}
else
retval = (char *)NULL;
return retval;
}
/* Bind a variable NAME to VALUE in the HASH_TABLE TABLE, which may be the
temporary environment (but usually is not). */
static SHELL_VAR *
bind_variable_internal (name, value, table, hflags, aflags)
const char *name;
char *value;
HASH_TABLE *table;
int hflags, aflags;
{
char *newval;
SHELL_VAR *entry;
entry = (hflags & HASH_NOSRCH) ? (SHELL_VAR *)NULL : hash_lookup (name, table);
if (entry == 0)
{
entry = make_new_variable (name, table);
var_setvalue (entry, make_variable_value (entry, value, 0)); /* XXX */
}
else if (entry->assign_func) /* array vars have assign functions now */
{
INVALIDATE_EXPORTSTR (entry);
newval = (aflags & ASS_APPEND) ? make_variable_value (entry, value, aflags) : value;
if (assoc_p (entry))
entry = (*(entry->assign_func)) (entry, newval, -1, savestring ("0"));
else if (array_p (entry))
entry = (*(entry->assign_func)) (entry, newval, 0, 0);
else
entry = (*(entry->assign_func)) (entry, newval, -1, 0);
if (newval != value)
free (newval);
return (entry);
}
else
{
if (readonly_p (entry) || noassign_p (entry))
{
if (readonly_p (entry))
err_readonly (name);
return (entry);
}
/* Variables which are bound are visible. */
VUNSETATTR (entry, att_invisible);
newval = make_variable_value (entry, value, aflags); /* XXX */
/* Invalidate any cached export string */
INVALIDATE_EXPORTSTR (entry);
#if defined (ARRAY_VARS)
/* XXX -- this bears looking at again -- XXX */
/* If an existing array variable x is being assigned to with x=b or
`read x' or something of that nature, silently convert it to
x[0]=b or `read x[0]'. */
if (array_p (entry))
{
array_insert (array_cell (entry), 0, newval);
free (newval);
}
else if (assoc_p (entry))
{
assoc_insert (assoc_cell (entry), savestring ("0"), newval);
free (newval);
}
else
#endif
{
FREE (value_cell (entry));
var_setvalue (entry, newval);
}
}
if (mark_modified_vars)
VSETATTR (entry, att_exported);
if (exported_p (entry))
array_needs_making = 1;
return (entry);
}
/* Bind a variable NAME to VALUE. This conses up the name
and value strings. If we have a temporary environment, we bind there
first, then we bind into shell_variables. */
SHELL_VAR *
bind_variable (name, value, flags)
const char *name;
char *value;
int flags;
{
SHELL_VAR *v;
VAR_CONTEXT *vc;
if (shell_variables == 0)
create_variable_tables ();
/* If we have a temporary environment, look there first for the variable,
and, if found, modify the value there before modifying it in the
shell_variables table. This allows sourced scripts to modify values
given to them in a temporary environment while modifying the variable
value that the caller sees. */
if (temporary_env)
bind_tempenv_variable (name, value);
/* XXX -- handle local variables here. */
for (vc = shell_variables; vc; vc = vc->down)
{
if (vc_isfuncenv (vc) || vc_isbltnenv (vc))
{
v = hash_lookup (name, vc->table);
if (v)
return (bind_variable_internal (name, value, vc->table, 0, flags));
}
}
return (bind_variable_internal (name, value, global_variables->table, 0, flags));
}
/* Make VAR, a simple shell variable, have value VALUE. Once assigned a
value, variables are no longer invisible. This is a duplicate of part
of the internals of bind_variable. If the variable is exported, or
all modified variables should be exported, mark the variable for export
and note that the export environment needs to be recreated. */
SHELL_VAR *
bind_variable_value (var, value, aflags)
SHELL_VAR *var;
char *value;
int aflags;
{
char *t;
VUNSETATTR (var, att_invisible);
if (var->assign_func)
{
/* If we're appending, we need the old value, so use
make_variable_value */
t = (aflags & ASS_APPEND) ? make_variable_value (var, value, aflags) : value;
(*(var->assign_func)) (var, t, -1, 0);
if (t != value && t)
free (t);
}
else
{
t = make_variable_value (var, value, aflags);
FREE (value_cell (var));
var_setvalue (var, t);
}
INVALIDATE_EXPORTSTR (var);
if (mark_modified_vars)
VSETATTR (var, att_exported);
if (exported_p (var))
array_needs_making = 1;
return (var);
}
/* Bind/create a shell variable with the name LHS to the RHS.
This creates or modifies a variable such that it is an integer.
This used to be in expr.c, but it is here so that all of the
variable binding stuff is localized. Since we don't want any
recursive evaluation from bind_variable() (possible without this code,
since bind_variable() calls the evaluator for variables with the integer
attribute set), we temporarily turn off the integer attribute for each
variable we set here, then turn it back on after binding as necessary. */
SHELL_VAR *
bind_int_variable (lhs, rhs)
char *lhs, *rhs;
{
register SHELL_VAR *v;
int isint, isarr;
isint = isarr = 0;
#if defined (ARRAY_VARS)
if (valid_array_reference (lhs))
{
isarr = 1;
v = array_variable_part (lhs, (char **)0, (int *)0);
}
else
#endif
v = find_variable (lhs);
if (v)
{
isint = integer_p (v);
VUNSETATTR (v, att_integer);
}
#if defined (ARRAY_VARS)
if (isarr)
v = assign_array_element (lhs, rhs, 0);
else
#endif
v = bind_variable (lhs, rhs, 0);
if (v && isint)
VSETATTR (v, att_integer);
return (v);
}
SHELL_VAR *
bind_var_to_int (var, val)
char *var;
intmax_t val;
{
char ibuf[INT_STRLEN_BOUND (intmax_t) + 1], *p;
p = fmtulong (val, 10, ibuf, sizeof (ibuf), 0);
return (bind_int_variable (var, p));
}
/* Do a function binding to a variable. You pass the name and
the command to bind to. This conses the name and command. */
SHELL_VAR *
bind_function (name, value)
const char *name;
COMMAND *value;
{
SHELL_VAR *entry;
entry = find_function (name);
if (entry == 0)
{
BUCKET_CONTENTS *elt;
elt = hash_insert (savestring (name), shell_functions, HASH_NOSRCH);
entry = new_shell_variable (name);
elt->data = (PTR_T)entry;
}
else
INVALIDATE_EXPORTSTR (entry);
if (var_isset (entry))
dispose_command (function_cell (entry));
if (value)
var_setfunc (entry, copy_command (value));
else
var_setfunc (entry, 0);
VSETATTR (entry, att_function);
if (mark_modified_vars)
VSETATTR (entry, att_exported);
VUNSETATTR (entry, att_invisible); /* Just to be sure */
if (exported_p (entry))
array_needs_making = 1;
#if defined (PROGRAMMABLE_COMPLETION)
set_itemlist_dirty (&it_functions);
#endif
return (entry);
}
#if defined (DEBUGGER)
/* Bind a function definition, which includes source file and line number
information in addition to the command, into the FUNCTION_DEF hash table.*/
void
bind_function_def (name, value)
const char *name;
FUNCTION_DEF *value;
{
FUNCTION_DEF *entry;
BUCKET_CONTENTS *elt;
COMMAND *cmd;
entry = find_function_def (name);
if (entry)
{
dispose_function_def_contents (entry);
entry = copy_function_def_contents (value, entry);
}
else
{
cmd = value->command;
value->command = 0;
entry = copy_function_def (value);
value->command = cmd;
elt = hash_insert (savestring (name), shell_function_defs, HASH_NOSRCH);
elt->data = (PTR_T *)entry;
}
}
#endif /* DEBUGGER */
/* Add STRING, which is of the form foo=bar, to the temporary environment
HASH_TABLE (temporary_env). The functions in execute_cmd.c are
responsible for moving the main temporary env to one of the other
temporary environments. The expansion code in subst.c calls this. */
int
assign_in_env (word, flags)
WORD_DESC *word;
int flags;
{
int offset;
char *name, *temp, *value;
SHELL_VAR *var;
const char *string;
string = word->word;
offset = assignment (string, 0);
name = savestring (string);
value = (char *)NULL;
if (name[offset] == '=')
{
name[offset] = 0;
/* ignore the `+' when assigning temporary environment */
if (name[offset - 1] == '+')
name[offset - 1] = '\0';
var = find_variable (name);
if (var && (readonly_p (var) || noassign_p (var)))
{
if (readonly_p (var))
err_readonly (name);
free (name);
return (0);
}
temp = name + offset + 1;
value = expand_assignment_string_to_string (temp, 0);
}
if (temporary_env == 0)
temporary_env = hash_create (TEMPENV_HASH_BUCKETS);
var = hash_lookup (name, temporary_env);
if (var == 0)
var = make_new_variable (name, temporary_env);
else
FREE (value_cell (var));
if (value == 0)
{
value = (char *)xmalloc (1); /* like do_assignment_internal */
value[0] = '\0';
}
var_setvalue (var, value);
var->attributes |= (att_exported|att_tempvar);
var->context = variable_context; /* XXX */
INVALIDATE_EXPORTSTR (var);
var->exportstr = mk_env_string (name, value, 0);
array_needs_making = 1;
#if 0
if (ifsname (name))
setifs (var);
else
#endif
if (flags)
stupidly_hack_special_variables (name);
if (echo_command_at_execute)
/* The Korn shell prints the `+ ' in front of assignment statements,
so we do too. */
xtrace_print_assignment (name, value, 0, 1);
free (name);
return 1;
}
/* **************************************************************** */
/* */
/* Copying variables */
/* */
/* **************************************************************** */
#ifdef INCLUDE_UNUSED
/* Copy VAR to a new data structure and return that structure. */
SHELL_VAR *
copy_variable (var)
SHELL_VAR *var;
{
SHELL_VAR *copy = (SHELL_VAR *)NULL;
if (var)
{
copy = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR));
copy->attributes = var->attributes;
copy->name = savestring (var->name);
if (function_p (var))
var_setfunc (copy, copy_command (function_cell (var)));
#if defined (ARRAY_VARS)
else if (array_p (var))
var_setarray (copy, array_copy (array_cell (var)));
else if (assoc_p (var))
var_setassoc (copy, assoc_copy (assoc_cell (var)));
#endif
else if (value_cell (var))
var_setvalue (copy, savestring (value_cell (var)));
else
var_setvalue (copy, (char *)NULL);
copy->dynamic_value = var->dynamic_value;
copy->assign_func = var->assign_func;
copy->exportstr = COPY_EXPORTSTR (var);
copy->context = var->context;
}
return (copy);
}
#endif
/* **************************************************************** */
/* */
/* Deleting and unsetting variables */
/* */
/* **************************************************************** */
/* Dispose of the information attached to VAR. */
static void
dispose_variable_value (var)
SHELL_VAR *var;
{
if (function_p (var))
dispose_command (function_cell (var));
#if defined (ARRAY_VARS)
else if (array_p (var))
array_dispose (array_cell (var));
else if (assoc_p (var))
assoc_dispose (assoc_cell (var));
#endif
else
FREE (value_cell (var));
}
void
dispose_variable (var)
SHELL_VAR *var;
{
if (var == 0)
return;
if (nofree_p (var) == 0)
dispose_variable_value (var);
FREE_EXPORTSTR (var);
free (var->name);
if (exported_p (var))
array_needs_making = 1;
free (var);
}
/* Unset the shell variable referenced by NAME. */
int
unbind_variable (name)
const char *name;
{
return makunbound (name, shell_variables);
}
/* Unset the shell function named NAME. */
int
unbind_func (name)
const char *name;
{
BUCKET_CONTENTS *elt;
SHELL_VAR *func;
elt = hash_remove (name, shell_functions, 0);
if (elt == 0)
return -1;
#if defined (PROGRAMMABLE_COMPLETION)
set_itemlist_dirty (&it_functions);
#endif
func = (SHELL_VAR *)elt->data;
if (func)
{
if (exported_p (func))
array_needs_making++;
dispose_variable (func);
}
free (elt->key);
free (elt);
return 0;
}
#if defined (DEBUGGER)
int
unbind_function_def (name)
const char *name;
{
BUCKET_CONTENTS *elt;
FUNCTION_DEF *funcdef;
elt = hash_remove (name, shell_function_defs, 0);
if (elt == 0)
return -1;
funcdef = (FUNCTION_DEF *)elt->data;
if (funcdef)
dispose_function_def (funcdef);
free (elt->key);
free (elt);
return 0;
}
#endif /* DEBUGGER */
/* Make the variable associated with NAME go away. HASH_LIST is the
hash table from which this variable should be deleted (either
shell_variables or shell_functions).
Returns non-zero if the variable couldn't be found. */
int
makunbound (name, vc)
const char *name;
VAR_CONTEXT *vc;
{
BUCKET_CONTENTS *elt, *new_elt;
SHELL_VAR *old_var;
VAR_CONTEXT *v;
char *t;
for (elt = (BUCKET_CONTENTS *)NULL, v = vc; v; v = v->down)
if (elt = hash_remove (name, v->table, 0))
break;
if (elt == 0)
return (-1);
old_var = (SHELL_VAR *)elt->data;
if (old_var && exported_p (old_var))
array_needs_making++;
/* If we're unsetting a local variable and we're still executing inside
the function, just mark the variable as invisible. The function
eventually called by pop_var_context() will clean it up later. This
must be done so that if the variable is subsequently assigned a new
value inside the function, the `local' attribute is still present.
We also need to add it back into the correct hash table. */
if (old_var && local_p (old_var) && variable_context == old_var->context)
{
if (nofree_p (old_var))
var_setvalue (old_var, (char *)NULL);
#if defined (ARRAY_VARS)
else if (array_p (old_var))
array_dispose (array_cell (old_var));
else if (assoc_p (old_var))
assoc_dispose (assoc_cell (old_var));
#endif
else
FREE (value_cell (old_var));
/* Reset the attributes. Preserve the export attribute if the variable
came from a temporary environment. Make sure it stays local, and
make it invisible. */
old_var->attributes = (exported_p (old_var) && tempvar_p (old_var)) ? att_exported : 0;
VSETATTR (old_var, att_local);
VSETATTR (old_var, att_invisible);
var_setvalue (old_var, (char *)NULL);
INVALIDATE_EXPORTSTR (old_var);
new_elt = hash_insert (savestring (old_var->name), v->table, 0);
new_elt->data = (PTR_T)old_var;
stupidly_hack_special_variables (old_var->name);
free (elt->key);
free (elt);
return (0);
}
/* Have to save a copy of name here, because it might refer to
old_var->name. If so, stupidly_hack_special_variables will
reference freed memory. */
t = savestring (name);
free (elt->key);
free (elt);
dispose_variable (old_var);
stupidly_hack_special_variables (t);
free (t);
return (0);
}
/* Get rid of all of the variables in the current context. */
void
kill_all_local_variables ()
{
VAR_CONTEXT *vc;
for (vc = shell_variables; vc; vc = vc->down)
if (vc_isfuncenv (vc) && vc->scope == variable_context)
break;
if (vc == 0)
return; /* XXX */
if (vc->table && vc_haslocals (vc))
{
delete_all_variables (vc->table);
hash_dispose (vc->table);
}
vc->table = (HASH_TABLE *)NULL;
}
static void
free_variable_hash_data (data)
PTR_T data;
{
SHELL_VAR *var;
var = (SHELL_VAR *)data;
dispose_variable (var);
}
/* Delete the entire contents of the hash table. */
void
delete_all_variables (hashed_vars)
HASH_TABLE *hashed_vars;
{
hash_flush (hashed_vars, free_variable_hash_data);
}
/* **************************************************************** */
/* */
/* Setting variable attributes */
/* */
/* **************************************************************** */
#define FIND_OR_MAKE_VARIABLE(name, entry) \
do \
{ \
entry = find_variable (name); \
if (!entry) \
{ \
entry = bind_variable (name, "", 0); \
if (!no_invisible_vars && entry) entry->attributes |= att_invisible; \
} \
} \
while (0)
/* Make the variable associated with NAME be readonly.
If NAME does not exist yet, create it. */
void
set_var_read_only (name)
char *name;
{
SHELL_VAR *entry;
FIND_OR_MAKE_VARIABLE (name, entry);
VSETATTR (entry, att_readonly);
}
#ifdef INCLUDE_UNUSED
/* Make the function associated with NAME be readonly.
If NAME does not exist, we just punt, like auto_export code below. */
void
set_func_read_only (name)
const char *name;
{
SHELL_VAR *entry;
entry = find_function (name);
if (entry)
VSETATTR (entry, att_readonly);
}
/* Make the variable associated with NAME be auto-exported.
If NAME does not exist yet, create it. */
void
set_var_auto_export (name)
char *name;
{
SHELL_VAR *entry;
FIND_OR_MAKE_VARIABLE (name, entry);
set_auto_export (entry);
}
/* Make the function associated with NAME be auto-exported. */
void
set_func_auto_export (name)
const char *name;
{
SHELL_VAR *entry;
entry = find_function (name);
if (entry)
set_auto_export (entry);
}
#endif
/* **************************************************************** */
/* */
/* Creating lists of variables */
/* */
/* **************************************************************** */
static VARLIST *
vlist_alloc (nentries)
int nentries;
{
VARLIST *vlist;
vlist = (VARLIST *)xmalloc (sizeof (VARLIST));
vlist->list = (SHELL_VAR **)xmalloc ((nentries + 1) * sizeof (SHELL_VAR *));
vlist->list_size = nentries;
vlist->list_len = 0;
vlist->list[0] = (SHELL_VAR *)NULL;
return vlist;
}
static VARLIST *
vlist_realloc (vlist, n)
VARLIST *vlist;
int n;
{
if (vlist == 0)
return (vlist = vlist_alloc (n));
if (n > vlist->list_size)
{
vlist->list_size = n;
vlist->list = (SHELL_VAR **)xrealloc (vlist->list, (vlist->list_size + 1) * sizeof (SHELL_VAR *));
}
return vlist;
}
static void
vlist_add (vlist, var, flags)
VARLIST *vlist;
SHELL_VAR *var;
int flags;
{
register int i;
for (i = 0; i < vlist->list_len; i++)
if (STREQ (var->name, vlist->list[i]->name))
break;
if (i < vlist->list_len)
return;
if (i >= vlist->list_size)
vlist = vlist_realloc (vlist, vlist->list_size + 16);
vlist->list[vlist->list_len++] = var;
vlist->list[vlist->list_len] = (SHELL_VAR *)NULL;
}
/* Map FUNCTION over the variables in VAR_HASH_TABLE. Return an array of the
variables for which FUNCTION returns a non-zero value. A NULL value
for FUNCTION means to use all variables. */
SHELL_VAR **
map_over (function, vc)
sh_var_map_func_t *function;
VAR_CONTEXT *vc;
{
VAR_CONTEXT *v;
VARLIST *vlist;
SHELL_VAR **ret;
int nentries;
for (nentries = 0, v = vc; v; v = v->down)
nentries += HASH_ENTRIES (v->table);
if (nentries == 0)
return (SHELL_VAR **)NULL;
vlist = vlist_alloc (nentries);
for (v = vc; v; v = v->down)
flatten (v->table, function, vlist, 0);
ret = vlist->list;
free (vlist);
return ret;
}
SHELL_VAR **
map_over_funcs (function)
sh_var_map_func_t *function;
{
VARLIST *vlist;
SHELL_VAR **ret;
if (shell_functions == 0 || HASH_ENTRIES (shell_functions) == 0)
return ((SHELL_VAR **)NULL);
vlist = vlist_alloc (HASH_ENTRIES (shell_functions));
flatten (shell_functions, function, vlist, 0);
ret = vlist->list;
free (vlist);
return ret;
}
/* Flatten VAR_HASH_TABLE, applying FUNC to each member and adding those
elements for which FUNC succeeds to VLIST->list. FLAGS is reserved
for future use. Only unique names are added to VLIST. If FUNC is
NULL, each variable in VAR_HASH_TABLE is added to VLIST. If VLIST is
NULL, FUNC is applied to each SHELL_VAR in VAR_HASH_TABLE. If VLIST
and FUNC are both NULL, nothing happens. */
static void
flatten (var_hash_table, func, vlist, flags)
HASH_TABLE *var_hash_table;
sh_var_map_func_t *func;
VARLIST *vlist;
int flags;
{
register int i;
register BUCKET_CONTENTS *tlist;
int r;
SHELL_VAR *var;
if (var_hash_table == 0 || (HASH_ENTRIES (var_hash_table) == 0) || (vlist == 0 && func == 0))
return;
for (i = 0; i < var_hash_table->nbuckets; i++)
{
for (tlist = hash_items (i, var_hash_table); tlist; tlist = tlist->next)
{
var = (SHELL_VAR *)tlist->data;
r = func ? (*func) (var) : 1;
if (r && vlist)
vlist_add (vlist, var, flags);
}
}
}
void
sort_variables (array)
SHELL_VAR **array;
{
qsort (array, strvec_len ((char **)array), sizeof (SHELL_VAR *), (QSFUNC *)qsort_var_comp);
}
static int
qsort_var_comp (var1, var2)
SHELL_VAR **var1, **var2;
{
int result;
if ((result = (*var1)->name[0] - (*var2)->name[0]) == 0)
result = strcmp ((*var1)->name, (*var2)->name);
return (result);
}
/* Apply FUNC to each variable in SHELL_VARIABLES, adding each one for
which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */
static SHELL_VAR **
vapply (func)
sh_var_map_func_t *func;
{
SHELL_VAR **list;
list = map_over (func, shell_variables);
if (list /* && posixly_correct */)
sort_variables (list);
return (list);
}
/* Apply FUNC to each variable in SHELL_FUNCTIONS, adding each one for
which FUNC succeeds to an array of SHELL_VAR *s. Returns the array. */
static SHELL_VAR **
fapply (func)
sh_var_map_func_t *func;
{
SHELL_VAR **list;
list = map_over_funcs (func);
if (list /* && posixly_correct */)
sort_variables (list);
return (list);
}
/* Create a NULL terminated array of all the shell variables. */
SHELL_VAR **
all_shell_variables ()
{
return (vapply ((sh_var_map_func_t *)NULL));
}
/* Create a NULL terminated array of all the shell functions. */
SHELL_VAR **
all_shell_functions ()
{
return (fapply ((sh_var_map_func_t *)NULL));
}
static int
visible_var (var)
SHELL_VAR *var;
{
return (invisible_p (var) == 0);
}
SHELL_VAR **
all_visible_functions ()
{
return (fapply (visible_var));
}
SHELL_VAR **
all_visible_variables ()
{
return (vapply (visible_var));
}
/* Return non-zero if the variable VAR is visible and exported. Array
variables cannot be exported. */
static int
visible_and_exported (var)
SHELL_VAR *var;
{
return (invisible_p (var) == 0 && exported_p (var));
}
/* Candidate variables for the export environment are either valid variables
with the export attribute or invalid variables inherited from the initial
environment and simply passed through. */
static int
export_environment_candidate (var)
SHELL_VAR *var;
{
return (exported_p (var) && (invisible_p (var) == 0 || imported_p (var)));
}
/* Return non-zero if VAR is a local variable in the current context and
is exported. */
static int
local_and_exported (var)
SHELL_VAR *var;
{
return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context && exported_p (var));
}
SHELL_VAR **
all_exported_variables ()
{
return (vapply (visible_and_exported));
}
SHELL_VAR **
local_exported_variables ()
{
return (vapply (local_and_exported));
}
static int
variable_in_context (var)
SHELL_VAR *var;
{
return (invisible_p (var) == 0 && local_p (var) && var->context == variable_context);
}
SHELL_VAR **
all_local_variables ()
{
VARLIST *vlist;
SHELL_VAR **ret;
VAR_CONTEXT *vc;
vc = shell_variables;
for (vc = shell_variables; vc; vc = vc->down)
if (vc_isfuncenv (vc) && vc->scope == variable_context)
break;
if (vc == 0)
{
internal_error (_("all_local_variables: no function context at current scope"));
return (SHELL_VAR **)NULL;
}
if (vc->table == 0 || HASH_ENTRIES (vc->table) == 0 || vc_haslocals (vc) == 0)
return (SHELL_VAR **)NULL;
vlist = vlist_alloc (HASH_ENTRIES (vc->table));
flatten (vc->table, variable_in_context, vlist, 0);
ret = vlist->list;
free (vlist);
if (ret)
sort_variables (ret);
return ret;
}
#if defined (ARRAY_VARS)
/* Return non-zero if the variable VAR is visible and an array. */
static int
visible_array_vars (var)
SHELL_VAR *var;
{
return (invisible_p (var) == 0 && array_p (var));
}
SHELL_VAR **
all_array_variables ()
{
return (vapply (visible_array_vars));
}
#endif /* ARRAY_VARS */
char **
all_variables_matching_prefix (prefix)
const char *prefix;
{
SHELL_VAR **varlist;
char **rlist;
int vind, rind, plen;
plen = STRLEN (prefix);
varlist = all_visible_variables ();
for (vind = 0; varlist && varlist[vind]; vind++)
;
if (varlist == 0 || vind == 0)
return ((char **)NULL);
rlist = strvec_create (vind + 1);
for (vind = rind = 0; varlist[vind]; vind++)
{
if (plen == 0 || STREQN (prefix, varlist[vind]->name, plen))
rlist[rind++] = savestring (varlist[vind]->name);
}
rlist[rind] = (char *)0;
free (varlist);
return rlist;
}
/* **************************************************************** */
/* */
/* Managing temporary variable scopes */
/* */
/* **************************************************************** */
/* Make variable NAME have VALUE in the temporary environment. */
static SHELL_VAR *
bind_tempenv_variable (name, value)
const char *name;
char *value;
{
SHELL_VAR *var;
var = temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL;
if (var)
{
FREE (value_cell (var));
var_setvalue (var, savestring (value));
INVALIDATE_EXPORTSTR (var);
}
return (var);
}
/* Find a variable in the temporary environment that is named NAME.
Return the SHELL_VAR *, or NULL if not found. */
SHELL_VAR *
find_tempenv_variable (name)
const char *name;
{
return (temporary_env ? hash_lookup (name, temporary_env) : (SHELL_VAR *)NULL);
}
char **tempvar_list;
int tvlist_ind;
/* Push the variable described by (SHELL_VAR *)DATA down to the next
variable context from the temporary environment. */
static void
push_temp_var (data)
PTR_T data;
{
SHELL_VAR *var, *v;
HASH_TABLE *binding_table;
var = (SHELL_VAR *)data;
binding_table = shell_variables->table;
if (binding_table == 0)
{
if (shell_variables == global_variables)
/* shouldn't happen */
binding_table = shell_variables->table = global_variables->table = hash_create (0);
else
binding_table = shell_variables->table = hash_create (TEMPENV_HASH_BUCKETS);
}
v = bind_variable_internal (var->name, value_cell (var), binding_table, 0, 0);
/* XXX - should we set the context here? It shouldn't matter because of how
assign_in_env works, but might want to check. */
if (binding_table == global_variables->table) /* XXX */
var->attributes &= ~(att_tempvar|att_propagate);
else
{
var->attributes |= att_propagate;
if (binding_table == shell_variables->table)
shell_variables->flags |= VC_HASTMPVAR;
}
v->attributes |= var->attributes;
if (find_special_var (var->name) >= 0)
tempvar_list[tvlist_ind++] = savestring (var->name);
dispose_variable (var);
}
static void
propagate_temp_var (data)
PTR_T data;
{
SHELL_VAR *var;
var = (SHELL_VAR *)data;
if (tempvar_p (var) && (var->attributes & att_propagate))
push_temp_var (data);
else
{
if (find_special_var (var->name) >= 0)
tempvar_list[tvlist_ind++] = savestring (var->name);
dispose_variable (var);
}
}
/* Free the storage used in the hash table for temporary
environment variables. PUSHF is a function to be called
to free each hash table entry. It takes care of pushing variables
to previous scopes if appropriate. PUSHF stores names of variables
that require special handling (e.g., IFS) on tempvar_list, so this
function can call stupidly_hack_special_variables on all the
variables in the list when the temporary hash table is destroyed. */
static void
dispose_temporary_env (pushf)
sh_free_func_t *pushf;
{
int i;
tempvar_list = strvec_create (HASH_ENTRIES (temporary_env) + 1);
tempvar_list[tvlist_ind = 0] = 0;
hash_flush (temporary_env, pushf);
hash_dispose (temporary_env);
temporary_env = (HASH_TABLE *)NULL;
tempvar_list[tvlist_ind] = 0;
array_needs_making = 1;
#if 0
sv_ifs ("IFS"); /* XXX here for now -- check setifs in assign_in_env */
#endif
for (i = 0; i < tvlist_ind; i++)
stupidly_hack_special_variables (tempvar_list[i]);
strvec_dispose (tempvar_list);
tempvar_list = 0;
tvlist_ind = 0;
}
void
dispose_used_env_vars ()
{
if (temporary_env)
{
dispose_temporary_env (propagate_temp_var);
maybe_make_export_env ();
}
}
/* Take all of the shell variables in the temporary environment HASH_TABLE
and make shell variables from them at the current variable context. */
void
merge_temporary_env ()
{
if (temporary_env)
dispose_temporary_env (push_temp_var);
}
/* **************************************************************** */
/* */
/* Creating and manipulating the environment */
/* */
/* **************************************************************** */
static inline char *
mk_env_string (name, value, isfunc)
const char *name, *value;
int isfunc;
{
size_t name_len, value_len;
char *p, *q;
name_len = strlen (name);
value_len = STRLEN (value);
/* If we are exporting a shell function, construct the encoded function
name. */
if (isfunc && value)
{
p = (char *)xmalloc (BASHFUNC_PREFLEN + name_len + BASHFUNC_SUFFLEN + value_len + 2);
q = p;
memcpy (q, BASHFUNC_PREFIX, BASHFUNC_PREFLEN);
q += BASHFUNC_PREFLEN;
memcpy (q, name, name_len);
q += name_len;
memcpy (q, BASHFUNC_SUFFIX, BASHFUNC_SUFFLEN);
q += BASHFUNC_SUFFLEN;
}
else
{
p = (char *)xmalloc (2 + name_len + value_len);
memcpy (p, name, name_len);
q = p + name_len;
}
q[0] = '=';
if (value && *value)
memcpy (q + 1, value, value_len + 1);
else
q[1] = '\0';
return (p);
}
#ifdef DEBUG
/* Debugging */
static int
valid_exportstr (v)
SHELL_VAR *v;
{
char *s;
s = v->exportstr;
if (s == 0)
{
internal_error (_("%s has null exportstr"), v->name);
return (0);
}
if (legal_variable_starter ((unsigned char)*s) == 0)
{
internal_error (_("invalid character %d in exportstr for %s"), *s, v->name);
return (0);
}
for (s = v->exportstr + 1; s && *s; s++)
{
if (*s == '=')
break;
if (legal_variable_char ((unsigned char)*s) == 0)
{
internal_error (_("invalid character %d in exportstr for %s"), *s, v->name);
return (0);
}
}
if (*s != '=')
{
internal_error (_("no `=' in exportstr for %s"), v->name);
return (0);
}
return (1);
}
#endif
static char **
make_env_array_from_var_list (vars)
SHELL_VAR **vars;
{
register int i, list_index;
register SHELL_VAR *var;
char **list, *value;
list = strvec_create ((1 + strvec_len ((char **)vars)));
#define USE_EXPORTSTR (value == var->exportstr)
for (i = 0, list_index = 0; var = vars[i]; i++)
{
#if defined (__CYGWIN__)
/* We don't use the exportstr stuff on Cygwin at all. */
INVALIDATE_EXPORTSTR (var);
#endif
if (var->exportstr)
value = var->exportstr;
else if (function_p (var))
value = named_function_string ((char *)NULL, function_cell (var), 0);
#if defined (ARRAY_VARS)
else if (array_p (var))
# if 0
value = array_to_assignment_string (array_cell (var));
# else
continue; /* XXX array vars cannot yet be exported */
# endif
else if (assoc_p (var))
# if 0
value = assoc_to_assignment_string (assoc_cell (var));
# else
continue; /* XXX associative array vars cannot yet be exported */
# endif
#endif
else
value = value_cell (var);
if (value)
{
/* Gee, I'd like to get away with not using savestring() if we're
using the cached exportstr... */
list[list_index] = USE_EXPORTSTR ? savestring (value)
: mk_env_string (var->name, value, function_p (var));
if (USE_EXPORTSTR == 0)
SAVE_EXPORTSTR (var, list[list_index]);
list_index++;
#undef USE_EXPORTSTR
#if 0 /* not yet */
#if defined (ARRAY_VARS)
if (array_p (var) || assoc_p (var))
free (value);
#endif
#endif
}
}
list[list_index] = (char *)NULL;
return (list);
}
/* Make an array of assignment statements from the hash table
HASHED_VARS which contains SHELL_VARs. Only visible, exported
variables are eligible. */
static char **
make_var_export_array (vcxt)
VAR_CONTEXT *vcxt;
{
char **list;
SHELL_VAR **vars;
#if 0
vars = map_over (visible_and_exported, vcxt);
#else
vars = map_over (export_environment_candidate, vcxt);
#endif
if (vars == 0)
return (char **)NULL;
list = make_env_array_from_var_list (vars);
free (vars);
return (list);
}
static char **
make_func_export_array ()
{
char **list;
SHELL_VAR **vars;
vars = map_over_funcs (visible_and_exported);
if (vars == 0)
return (char **)NULL;
list = make_env_array_from_var_list (vars);
free (vars);
return (list);
}
/* Add ENVSTR to the end of the exported environment, EXPORT_ENV. */
#define add_to_export_env(envstr,do_alloc) \
do \
{ \
if (export_env_index >= (export_env_size - 1)) \
{ \
export_env_size += 16; \
export_env = strvec_resize (export_env, export_env_size); \
environ = export_env; \
} \
export_env[export_env_index++] = (do_alloc) ? savestring (envstr) : envstr; \
export_env[export_env_index] = (char *)NULL; \
} while (0)
/* Add ASSIGN to EXPORT_ENV, or supercede a previous assignment in the
array with the same left-hand side. Return the new EXPORT_ENV. */
char **
add_or_supercede_exported_var (assign, do_alloc)
char *assign;
int do_alloc;
{
register int i;
int equal_offset;
equal_offset = assignment (assign, 0);
if (equal_offset == 0)
return (export_env);
/* If this is a function, then only supersede the function definition.
We do this by including the `=() {' in the comparison, like
initialize_shell_variables does. */
if (assign[equal_offset + 1] == '(' &&
strncmp (assign + equal_offset + 2, ") {", 3) == 0) /* } */
equal_offset += 4;
for (i = 0; i < export_env_index; i++)
{
if (STREQN (assign, export_env[i], equal_offset + 1))
{
free (export_env[i]);
export_env[i] = do_alloc ? savestring (assign) : assign;
return (export_env);
}
}
add_to_export_env (assign, do_alloc);
return (export_env);
}
static void
add_temp_array_to_env (temp_array, do_alloc, do_supercede)
char **temp_array;
int do_alloc, do_supercede;
{
register int i;
if (temp_array == 0)
return;
for (i = 0; temp_array[i]; i++)
{
if (do_supercede)
export_env = add_or_supercede_exported_var (temp_array[i], do_alloc);
else
add_to_export_env (temp_array[i], do_alloc);
}
free (temp_array);
}
/* Make the environment array for the command about to be executed, if the
array needs making. Otherwise, do nothing. If a shell action could
change the array that commands receive for their environment, then the
code should `array_needs_making++'.
The order to add to the array is:
temporary_env
list of var contexts whose head is shell_variables
shell_functions
This is the shell variable lookup order. We add only new variable
names at each step, which allows local variables and variables in
the temporary environments to shadow variables in the global (or
any previous) scope.
*/
static int
n_shell_variables ()
{
VAR_CONTEXT *vc;
int n;
for (n = 0, vc = shell_variables; vc; vc = vc->down)
n += HASH_ENTRIES (vc->table);
return n;
}
void
maybe_make_export_env ()
{
register char **temp_array;
int new_size;
VAR_CONTEXT *tcxt;
if (array_needs_making)
{
if (export_env)
strvec_flush (export_env);
/* Make a guess based on how many shell variables and functions we
have. Since there will always be array variables, and array
variables are not (yet) exported, this will always be big enough
for the exported variables and functions. */
new_size = n_shell_variables () + HASH_ENTRIES (shell_functions) + 1 +
HASH_ENTRIES (temporary_env);
if (new_size > export_env_size)
{
export_env_size = new_size;
export_env = strvec_resize (export_env, export_env_size);
environ = export_env;
}
export_env[export_env_index = 0] = (char *)NULL;
/* Make a dummy variable context from the temporary_env, stick it on
the front of shell_variables, call make_var_export_array on the
whole thing to flatten it, and convert the list of SHELL_VAR *s
to the form needed by the environment. */
if (temporary_env)
{
tcxt = new_var_context ((char *)NULL, 0);
tcxt->table = temporary_env;
tcxt->down = shell_variables;
}
else
tcxt = shell_variables;
temp_array = make_var_export_array (tcxt);
if (temp_array)
add_temp_array_to_env (temp_array, 0, 0);
if (tcxt != shell_variables)
free (tcxt);
#if defined (RESTRICTED_SHELL)
/* Restricted shells may not export shell functions. */
temp_array = restricted ? (char **)0 : make_func_export_array ();
#else
temp_array = make_func_export_array ();
#endif
if (temp_array)
add_temp_array_to_env (temp_array, 0, 0);
array_needs_making = 0;
}
}
/* This is an efficiency hack. PWD and OLDPWD are auto-exported, so
we will need to remake the exported environment every time we
change directories. `_' is always put into the environment for
every external command, so without special treatment it will always
cause the environment to be remade.
If there is no other reason to make the exported environment, we can
just update the variables in place and mark the exported environment
as no longer needing a remake. */
void
update_export_env_inplace (env_prefix, preflen, value)
char *env_prefix;
int preflen;
char *value;
{
char *evar;
evar = (char *)xmalloc (STRLEN (value) + preflen + 1);
strcpy (evar, env_prefix);
if (value)
strcpy (evar + preflen, value);
export_env = add_or_supercede_exported_var (evar, 0);
}
/* We always put _ in the environment as the name of this command. */
void
put_command_name_into_env (command_name)
char *command_name;
{
update_export_env_inplace ("_=", 2, command_name);
}
#if 0 /* UNUSED -- it caused too many problems */
void
put_gnu_argv_flags_into_env (pid, flags_string)
intmax_t pid;
char *flags_string;
{
char *dummy, *pbuf;
int l, fl;
pbuf = itos (pid);
l = strlen (pbuf);
fl = strlen (flags_string);
dummy = (char *)xmalloc (l + fl + 30);
dummy[0] = '_';
strcpy (dummy + 1, pbuf);
strcpy (dummy + 1 + l, "_GNU_nonoption_argv_flags_");
dummy[l + 27] = '=';
strcpy (dummy + l + 28, flags_string);
free (pbuf);
export_env = add_or_supercede_exported_var (dummy, 0);
}
#endif
/* **************************************************************** */
/* */
/* Managing variable contexts */
/* */
/* **************************************************************** */
/* Allocate and return a new variable context with NAME and FLAGS.
NAME can be NULL. */
VAR_CONTEXT *
new_var_context (name, flags)
char *name;
int flags;
{
VAR_CONTEXT *vc;
vc = (VAR_CONTEXT *)xmalloc (sizeof (VAR_CONTEXT));
vc->name = name ? savestring (name) : (char *)NULL;
vc->scope = variable_context;
vc->flags = flags;
vc->up = vc->down = (VAR_CONTEXT *)NULL;
vc->table = (HASH_TABLE *)NULL;
return vc;
}
/* Free a variable context and its data, including the hash table. Dispose
all of the variables. */
void
dispose_var_context (vc)
VAR_CONTEXT *vc;
{
FREE (vc->name);
if (vc->table)
{
delete_all_variables (vc->table);
hash_dispose (vc->table);
}
free (vc);
}
/* Set VAR's scope level to the current variable context. */
static int
set_context (var)
SHELL_VAR *var;
{
return (var->context = variable_context);
}
/* Make a new variable context with NAME and FLAGS and a HASH_TABLE of
temporary variables, and push it onto shell_variables. This is
for shell functions. */
VAR_CONTEXT *
push_var_context (name, flags, tempvars)
char *name;
int flags;
HASH_TABLE *tempvars;
{
VAR_CONTEXT *vc;
vc = new_var_context (name, flags);
vc->table = tempvars;
if (tempvars)
{
/* Have to do this because the temp environment was created before
variable_context was incremented. */
flatten (tempvars, set_context, (VARLIST *)NULL, 0);
vc->flags |= VC_HASTMPVAR;
}
vc->down = shell_variables;
shell_variables->up = vc;
return (shell_variables = vc);
}
static void
push_func_var (data)
PTR_T data;
{
SHELL_VAR *var, *v;
var = (SHELL_VAR *)data;
if (tempvar_p (var) && (posixly_correct || (var->attributes & att_propagate)))
{
/* Make sure we have a hash table to store the variable in while it is
being propagated down to the global variables table. Create one if
we have to */
if ((vc_isfuncenv (shell_variables) || vc_istempenv (shell_variables)) && shell_variables->table == 0)
shell_variables->table = hash_create (0);
/* XXX - should we set v->context here? */
v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0);
if (shell_variables == global_variables)
var->attributes &= ~(att_tempvar|att_propagate);
else
shell_variables->flags |= VC_HASTMPVAR;
v->attributes |= var->attributes;
}
else
stupidly_hack_special_variables (var->name); /* XXX */
dispose_variable (var);
}
/* Pop the top context off of VCXT and dispose of it, returning the rest of
the stack. */
void
pop_var_context ()
{
VAR_CONTEXT *ret, *vcxt;
vcxt = shell_variables;
if (vc_isfuncenv (vcxt) == 0)
{
internal_error (_("pop_var_context: head of shell_variables not a function context"));
return;
}
if (ret = vcxt->down)
{
ret->up = (VAR_CONTEXT *)NULL;
shell_variables = ret;
if (vcxt->table)
hash_flush (vcxt->table, push_func_var);
dispose_var_context (vcxt);
}
else
internal_error (_("pop_var_context: no global_variables context"));
}
/* Delete the HASH_TABLEs for all variable contexts beginning at VCXT, and
all of the VAR_CONTEXTs except GLOBAL_VARIABLES. */
void
delete_all_contexts (vcxt)
VAR_CONTEXT *vcxt;
{
VAR_CONTEXT *v, *t;
for (v = vcxt; v != global_variables; v = t)
{
t = v->down;
dispose_var_context (v);
}
delete_all_variables (global_variables->table);
shell_variables = global_variables;
}
/* **************************************************************** */
/* */
/* Pushing and Popping temporary variable scopes */
/* */
/* **************************************************************** */
VAR_CONTEXT *
push_scope (flags, tmpvars)
int flags;
HASH_TABLE *tmpvars;
{
return (push_var_context ((char *)NULL, flags, tmpvars));
}
static void
push_exported_var (data)
PTR_T data;
{
SHELL_VAR *var, *v;
var = (SHELL_VAR *)data;
/* If a temp var had its export attribute set, or it's marked to be
propagated, bind it in the previous scope before disposing it. */
/* XXX - This isn't exactly right, because all tempenv variables have the
export attribute set. */
#if 0
if (exported_p (var) || (var->attributes & att_propagate))
#else
if (tempvar_p (var) && exported_p (var) && (var->attributes & att_propagate))
#endif
{
var->attributes &= ~att_tempvar; /* XXX */
v = bind_variable_internal (var->name, value_cell (var), shell_variables->table, 0, 0);
if (shell_variables == global_variables)
var->attributes &= ~att_propagate;
v->attributes |= var->attributes;
}
else
stupidly_hack_special_variables (var->name); /* XXX */
dispose_variable (var);
}
void
pop_scope (is_special)
int is_special;
{
VAR_CONTEXT *vcxt, *ret;
vcxt = shell_variables;
if (vc_istempscope (vcxt) == 0)
{
internal_error (_("pop_scope: head of shell_variables not a temporary environment scope"));
return;
}
ret = vcxt->down;
if (ret)
ret->up = (VAR_CONTEXT *)NULL;
shell_variables = ret;
/* Now we can take care of merging variables in VCXT into set of scopes
whose head is RET (shell_variables). */
FREE (vcxt->name);
if (vcxt->table)
{
if (is_special)
hash_flush (vcxt->table, push_func_var);
else
hash_flush (vcxt->table, push_exported_var);
hash_dispose (vcxt->table);
}
free (vcxt);
sv_ifs ("IFS"); /* XXX here for now */
}
/* **************************************************************** */
/* */
/* Pushing and Popping function contexts */
/* */
/* **************************************************************** */
static WORD_LIST **dollar_arg_stack = (WORD_LIST **)NULL;
static int dollar_arg_stack_slots;
static int dollar_arg_stack_index;
/* XXX - we might want to consider pushing and popping the `getopts' state
when we modify the positional parameters. */
void
push_context (name, is_subshell, tempvars)
char *name; /* function name */
int is_subshell;
HASH_TABLE *tempvars;
{
if (is_subshell == 0)
push_dollar_vars ();
variable_context++;
push_var_context (name, VC_FUNCENV, tempvars);
}
/* Only called when subshell == 0, so we don't need to check, and can
unconditionally pop the dollar vars off the stack. */
void
pop_context ()
{
pop_dollar_vars ();
variable_context--;
pop_var_context ();
sv_ifs ("IFS"); /* XXX here for now */
}
/* Save the existing positional parameters on a stack. */
void
push_dollar_vars ()
{
if (dollar_arg_stack_index + 2 > dollar_arg_stack_slots)
{
dollar_arg_stack = (WORD_LIST **)
xrealloc (dollar_arg_stack, (dollar_arg_stack_slots += 10)
* sizeof (WORD_LIST **));
}
dollar_arg_stack[dollar_arg_stack_index++] = list_rest_of_args ();
dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
}
/* Restore the positional parameters from our stack. */
void
pop_dollar_vars ()
{
if (!dollar_arg_stack || dollar_arg_stack_index == 0)
return;
remember_args (dollar_arg_stack[--dollar_arg_stack_index], 1);
dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
set_dollar_vars_unchanged ();
}
void
dispose_saved_dollar_vars ()
{
if (!dollar_arg_stack || dollar_arg_stack_index == 0)
return;
dispose_words (dollar_arg_stack[dollar_arg_stack_index]);
dollar_arg_stack[dollar_arg_stack_index] = (WORD_LIST *)NULL;
}
/* Manipulate the special BASH_ARGV and BASH_ARGC variables. */
void
push_args (list)
WORD_LIST *list;
{
#if defined (ARRAY_VARS) && defined (DEBUGGER)
SHELL_VAR *bash_argv_v, *bash_argc_v;
ARRAY *bash_argv_a, *bash_argc_a;
WORD_LIST *l;
arrayind_t i;
char *t;
GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
for (l = list, i = 0; l; l = l->next, i++)
array_push (bash_argv_a, l->word->word);
t = itos (i);
array_push (bash_argc_a, t);
free (t);
#endif /* ARRAY_VARS && DEBUGGER */
}
/* Remove arguments from BASH_ARGV array. Pop top element off BASH_ARGC
array and use that value as the count of elements to remove from
BASH_ARGV. */
void
pop_args ()
{
#if defined (ARRAY_VARS) && defined (DEBUGGER)
SHELL_VAR *bash_argv_v, *bash_argc_v;
ARRAY *bash_argv_a, *bash_argc_a;
ARRAY_ELEMENT *ce;
intmax_t i;
GET_ARRAY_FROM_VAR ("BASH_ARGV", bash_argv_v, bash_argv_a);
GET_ARRAY_FROM_VAR ("BASH_ARGC", bash_argc_v, bash_argc_a);
ce = array_shift (bash_argc_a, 1, 0);
if (ce == 0 || legal_number (element_value (ce), &i) == 0)
i = 0;
for ( ; i > 0; i--)
array_pop (bash_argv_a);
array_dispose_element (ce);
#endif /* ARRAY_VARS && DEBUGGER */
}
/*************************************************
* *
* Functions to manage special variables *
* *
*************************************************/
/* Extern declarations for variables this code has to manage. */
extern int eof_encountered, eof_encountered_limit, ignoreeof;
#if defined (READLINE)
extern int hostname_list_initialized;
#endif
/* An alist of name.function for each special variable. Most of the
functions don't do much, and in fact, this would be faster with a
switch statement, but by the end of this file, I am sick of switch
statements. */
#define SET_INT_VAR(name, intvar) intvar = find_variable (name) != 0
/* This table will be sorted with qsort() the first time it's accessed. */
struct name_and_function {
char *name;
sh_sv_func_t *function;
};
static struct name_and_function special_vars[] = {
{ "BASH_XTRACEFD", sv_xtracefd },
#if defined (READLINE)
# if defined (STRICT_POSIX)
{ "COLUMNS", sv_winsize },
# endif
{ "COMP_WORDBREAKS", sv_comp_wordbreaks },
#endif
{ "FUNCNEST", sv_funcnest },
{ "GLOBIGNORE", sv_globignore },
#if defined (HISTORY)
{ "HISTCONTROL", sv_history_control },
{ "HISTFILESIZE", sv_histsize },
{ "HISTIGNORE", sv_histignore },
{ "HISTSIZE", sv_histsize },
{ "HISTTIMEFORMAT", sv_histtimefmt },
#endif
#if defined (__CYGWIN__)
{ "HOME", sv_home },
#endif
#if defined (READLINE)
{ "HOSTFILE", sv_hostfile },
#endif
{ "IFS", sv_ifs },
{ "IGNOREEOF", sv_ignoreeof },
{ "LANG", sv_locale },
{ "LC_ALL", sv_locale },
{ "LC_COLLATE", sv_locale },
{ "LC_CTYPE", sv_locale },
{ "LC_MESSAGES", sv_locale },
{ "LC_NUMERIC", sv_locale },
{ "LC_TIME", sv_locale },
#if defined (READLINE) && defined (STRICT_POSIX)
{ "LINES", sv_winsize },
#endif
{ "MAIL", sv_mail },
{ "MAILCHECK", sv_mail },
{ "MAILPATH", sv_mail },
{ "OPTERR", sv_opterr },
{ "OPTIND", sv_optind },
{ "PATH", sv_path },
{ "POSIXLY_CORRECT", sv_strict_posix },
#if defined (READLINE)
{ "TERM", sv_terminal },
{ "TERMCAP", sv_terminal },
{ "TERMINFO", sv_terminal },
#endif /* READLINE */
{ "TEXTDOMAIN", sv_locale },
{ "TEXTDOMAINDIR", sv_locale },
#if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE)
{ "TZ", sv_tz },
#endif
#if defined (HISTORY) && defined (BANG_HISTORY)
{ "histchars", sv_histchars },
#endif /* HISTORY && BANG_HISTORY */
{ "ignoreeof", sv_ignoreeof },
{ (char *)0, (sh_sv_func_t *)0 }
};
#define N_SPECIAL_VARS (sizeof (special_vars) / sizeof (special_vars[0]) - 1)
static int
sv_compare (sv1, sv2)
struct name_and_function *sv1, *sv2;
{
int r;
if ((r = sv1->name[0] - sv2->name[0]) == 0)
r = strcmp (sv1->name, sv2->name);
return r;
}
static inline int
find_special_var (name)
const char *name;
{
register int i, r;
for (i = 0; special_vars[i].name; i++)
{
r = special_vars[i].name[0] - name[0];
if (r == 0)
r = strcmp (special_vars[i].name, name);
if (r == 0)
return i;
else if (r > 0)
/* Can't match any of rest of elements in sorted list. Take this out
if it causes problems in certain environments. */
break;
}
return -1;
}
/* The variable in NAME has just had its state changed. Check to see if it
is one of the special ones where something special happens. */
void
stupidly_hack_special_variables (name)
char *name;
{
static int sv_sorted = 0;
int i;
if (sv_sorted == 0) /* shouldn't need, but it's fairly cheap. */
{
qsort (special_vars, N_SPECIAL_VARS, sizeof (special_vars[0]),
(QSFUNC *)sv_compare);
sv_sorted = 1;
}
i = find_special_var (name);
if (i != -1)
(*(special_vars[i].function)) (name);
}
/* Special variables that need hooks to be run when they are unset as part
of shell reinitialization should have their sv_ functions run here. */
void
reinit_special_variables ()
{
#if defined (READLINE)
sv_comp_wordbreaks ("COMP_WORDBREAKS");
#endif
sv_globignore ("GLOBIGNORE");
sv_opterr ("OPTERR");
}
void
sv_ifs (name)
char *name;
{
SHELL_VAR *v;
v = find_variable ("IFS");
setifs (v);
}
/* What to do just after the PATH variable has changed. */
void
sv_path (name)
char *name;
{
/* hash -r */
phash_flush ();
}
/* What to do just after one of the MAILxxxx variables has changed. NAME
is the name of the variable. This is called with NAME set to one of
MAIL, MAILCHECK, or MAILPATH. */
void
sv_mail (name)
char *name;
{
/* If the time interval for checking the files has changed, then
reset the mail timer. Otherwise, one of the pathname vars
to the users mailbox has changed, so rebuild the array of
filenames. */
if (name[4] == 'C') /* if (strcmp (name, "MAILCHECK") == 0) */
reset_mail_timer ();
else
{
free_mail_files ();
remember_mail_dates ();
}
}
void
sv_funcnest (name)
char *name;
{
SHELL_VAR *v;
intmax_t num;
v = find_variable (name);
if (v == 0)
funcnest_max = 0;
else if (legal_number (value_cell (v), &num) == 0)
funcnest_max = 0;
else
funcnest_max = num;
}
/* What to do when GLOBIGNORE changes. */
void
sv_globignore (name)
char *name;
{
if (privileged_mode == 0)
setup_glob_ignore (name);
}
#if defined (READLINE)
void
sv_comp_wordbreaks (name)
char *name;
{
SHELL_VAR *sv;
sv = find_variable (name);
if (sv == 0)
reset_completer_word_break_chars ();
}
/* What to do just after one of the TERMxxx variables has changed.
If we are an interactive shell, then try to reset the terminal
information in readline. */
void
sv_terminal (name)
char *name;
{
if (interactive_shell && no_line_editing == 0)
rl_reset_terminal (get_string_value ("TERM"));
}
void
sv_hostfile (name)
char *name;
{
SHELL_VAR *v;
v = find_variable (name);
if (v == 0)
clear_hostname_list ();
else
hostname_list_initialized = 0;
}
#if defined (STRICT_POSIX)
/* In strict posix mode, we allow assignments to LINES and COLUMNS (and values
found in the initial environment) to override the terminal size reported by
the kernel. */
void
sv_winsize (name)
char *name;
{
SHELL_VAR *v;
intmax_t xd;
int d;
if (posixly_correct == 0 || interactive_shell == 0 || no_line_editing)
return;
v = find_variable (name);
if (v == 0 || var_isnull (v))
rl_reset_screen_size ();
else
{
if (legal_number (value_cell (v), &xd) == 0)
return;
winsize_assignment = 1;
d = xd; /* truncate */
if (name[0] == 'L') /* LINES */
rl_set_screen_size (d, -1);
else /* COLUMNS */
rl_set_screen_size (-1, d);
winsize_assignment = 0;
}
}
#endif /* STRICT_POSIX */
#endif /* READLINE */
/* Update the value of HOME in the export environment so tilde expansion will
work on cygwin. */
#if defined (__CYGWIN__)
sv_home (name)
char *name;
{
array_needs_making = 1;
maybe_make_export_env ();
}
#endif
#if defined (HISTORY)
/* What to do after the HISTSIZE or HISTFILESIZE variables change.
If there is a value for this HISTSIZE (and it is numeric), then stifle
the history. Otherwise, if there is NO value for this variable,
unstifle the history. If name is HISTFILESIZE, and its value is
numeric, truncate the history file to hold no more than that many
lines. */
void
sv_histsize (name)
char *name;
{
char *temp;
intmax_t num;
int hmax;
temp = get_string_value (name);
if (temp && *temp)
{
if (legal_number (temp, &num))
{
hmax = num;
if (name[4] == 'S')
{
stifle_history (hmax);
hmax = where_history ();
if (history_lines_this_session > hmax)
history_lines_this_session = hmax;
}
else
{
history_truncate_file (get_string_value ("HISTFILE"), hmax);
if (hmax <= history_lines_in_file)
history_lines_in_file = hmax;
}
}
}
else if (name[4] == 'S')
unstifle_history ();
}
/* What to do after the HISTIGNORE variable changes. */
void
sv_histignore (name)
char *name;
{
setup_history_ignore (name);
}
/* What to do after the HISTCONTROL variable changes. */
void
sv_history_control (name)
char *name;
{
char *temp;
char *val;
int tptr;
history_control = 0;
temp = get_string_value (name);
if (temp == 0 || *temp == 0)
return;
tptr = 0;
while (val = extract_colon_unit (temp, &tptr))
{
if (STREQ (val, "ignorespace"))
history_control |= HC_IGNSPACE;
else if (STREQ (val, "ignoredups"))
history_control |= HC_IGNDUPS;
else if (STREQ (val, "ignoreboth"))
history_control |= HC_IGNBOTH;
else if (STREQ (val, "erasedups"))
history_control |= HC_ERASEDUPS;
free (val);
}
}
#if defined (BANG_HISTORY)
/* Setting/unsetting of the history expansion character. */
void
sv_histchars (name)
char *name;
{
char *temp;
temp = get_string_value (name);
if (temp)
{
history_expansion_char = *temp;
if (temp[0] && temp[1])
{
history_subst_char = temp[1];
if (temp[2])
history_comment_char = temp[2];
}
}
else
{
history_expansion_char = '!';
history_subst_char = '^';
history_comment_char = '#';
}
}
#endif /* BANG_HISTORY */
void
sv_histtimefmt (name)
char *name;
{
SHELL_VAR *v;
v = find_variable (name);
history_write_timestamps = (v != 0);
}
#endif /* HISTORY */
#if defined (HAVE_TZSET) && defined (PROMPT_STRING_DECODE)
void
sv_tz (name)
char *name;
{
tzset ();
}
#endif
/* If the variable exists, then the value of it can be the number
of times we actually ignore the EOF. The default is small,
(smaller than csh, anyway). */
void
sv_ignoreeof (name)
char *name;
{
SHELL_VAR *tmp_var;
char *temp;
eof_encountered = 0;
tmp_var = find_variable (name);
ignoreeof = tmp_var != 0;
temp = tmp_var ? value_cell (tmp_var) : (char *)NULL;
if (temp)
eof_encountered_limit = (*temp && all_digits (temp)) ? atoi (temp) : 10;
set_shellopts (); /* make sure `ignoreeof' is/is not in $SHELLOPTS */
}
void
sv_optind (name)
char *name;
{
char *tt;
int s;
tt = get_string_value ("OPTIND");
if (tt && *tt)
{
s = atoi (tt);
/* According to POSIX, setting OPTIND=1 resets the internal state
of getopt (). */
if (s < 0 || s == 1)
s = 0;
}
else
s = 0;
getopts_reset (s);
}
void
sv_opterr (name)
char *name;
{
char *tt;
tt = get_string_value ("OPTERR");
sh_opterr = (tt && *tt) ? atoi (tt) : 1;
}
void
sv_strict_posix (name)
char *name;
{
SET_INT_VAR (name, posixly_correct);
posix_initialize (posixly_correct);
#if defined (READLINE)
if (interactive_shell)
posix_readline_initialize (posixly_correct);
#endif /* READLINE */
set_shellopts (); /* make sure `posix' is/is not in $SHELLOPTS */
}
void
sv_locale (name)
char *name;
{
char *v;
v = get_string_value (name);
if (name[0] == 'L' && name[1] == 'A') /* LANG */
set_lang (name, v);
else
set_locale_var (name, v); /* LC_*, TEXTDOMAIN* */
}
#if defined (ARRAY_VARS)
void
set_pipestatus_array (ps, nproc)
int *ps;
int nproc;
{
SHELL_VAR *v;
ARRAY *a;
ARRAY_ELEMENT *ae;
register int i;
char *t, tbuf[INT_STRLEN_BOUND(int) + 1];
v = find_variable ("PIPESTATUS");
if (v == 0)
v = make_new_array_variable ("PIPESTATUS");
if (array_p (v) == 0)
return; /* Do nothing if not an array variable. */
a = array_cell (v);
if (a == 0 || array_num_elements (a) == 0)
{
for (i = 0; i < nproc; i++) /* was ps[i] != -1, not i < nproc */
{
t = inttostr (ps[i], tbuf, sizeof (tbuf));
array_insert (a, i, t);
}
return;
}
/* Fast case */
if (array_num_elements (a) == nproc && nproc == 1)
{
ae = element_forw (a->head);
free (element_value (ae));
ae->value = itos (ps[0]);
}
else if (array_num_elements (a) <= nproc)
{
/* modify in array_num_elements members in place, then add */
ae = a->head;
for (i = 0; i < array_num_elements (a); i++)
{
ae = element_forw (ae);
free (element_value (ae));
ae->value = itos (ps[i]);
}
/* add any more */
for ( ; i < nproc; i++)
{
t = inttostr (ps[i], tbuf, sizeof (tbuf));
array_insert (a, i, t);
}
}
else
{
/* deleting elements. it's faster to rebuild the array. */
array_flush (a);
for (i = 0; ps[i] != -1; i++)
{
t = inttostr (ps[i], tbuf, sizeof (tbuf));
array_insert (a, i, t);
}
}
}
ARRAY *
save_pipestatus_array ()
{
SHELL_VAR *v;
ARRAY *a, *a2;
v = find_variable ("PIPESTATUS");
if (v == 0 || array_p (v) == 0 || array_cell (v) == 0)
return ((ARRAY *)NULL);
a = array_cell (v);
a2 = array_copy (array_cell (v));
return a2;
}
void
restore_pipestatus_array (a)
ARRAY *a;
{
SHELL_VAR *v;
ARRAY *a2;
v = find_variable ("PIPESTATUS");
/* XXX - should we still assign even if existing value is NULL? */
if (v == 0 || array_p (v) == 0 || array_cell (v) == 0)
return;
a2 = array_cell (v);
var_setarray (v, a);
array_dispose (a2);
}
#endif
void
set_pipestatus_from_exit (s)
int s;
{
#if defined (ARRAY_VARS)
static int v[2] = { 0, -1 };
v[0] = s;
set_pipestatus_array (v, 1);
#endif
}
void
sv_xtracefd (name)
char *name;
{
SHELL_VAR *v;
char *t, *e;
int fd;
FILE *fp;
v = find_variable (name);
if (v == 0)
{
xtrace_reset ();
return;
}
t = value_cell (v);
if (t == 0 || *t == 0)
xtrace_reset ();
else
{
fd = (int)strtol (t, &e, 10);
if (e != t && *e == '\0' && sh_validfd (fd))
{
fp = fdopen (fd, "w");
if (fp == 0)
internal_error (_("%s: %s: cannot open as FILE"), name, value_cell (v));
else
xtrace_set (fd, fp);
}
else
internal_error (_("%s: %s: invalid value for trace file descriptor"), name, value_cell (v));
}
}