--- /dev/null
+/* variables.c -- Functions for hacking shell variables. */
+
+/* Copyright (C) 1987-2013 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#include "bashtypes.h"
+#include "posixstat.h"
+#include "posixtime.h"
+
+#if defined (__QNX__)
+# if defined (__QNXNTO__)
+# include <sys/netmgr.h>
+# else
+# include <sys/vc.h>
+# endif /* !__QNXNTO__ */
+#endif /* __QNX__ */
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include "chartypes.h"
+#if defined (HAVE_PWD_H)
+# include <pwd.h>
+#endif
+#include "bashansi.h"
+#include "bashintl.h"
+
+#define NEED_XTRACE_SET_DECL
+
+#include "shell.h"
+#include "flags.h"
+#include "execute_cmd.h"
+#include "findcmd.h"
+#include "mailcheck.h"
+#include "input.h"
+#include "hashcmd.h"
+#include "pathexp.h"
+#include "alias.h"
+#include "jobs.h"
+
+#include "version.h"
+
+#include "builtins/getopt.h"
+#include "builtins/common.h"
+#include "builtins/builtext.h"
+
+#if defined (READLINE)
+# include "bashline.h"
+# include <readline/readline.h>
+#else
+# include <tilde/tilde.h>
+#endif
+
+#if defined (HISTORY)
+# include "bashhist.h"
+# include <readline/history.h>
+#endif /* HISTORY */
+
+#if defined (PROGRAMMABLE_COMPLETION)
+# include "pcomplete.h"
+#endif
+
+#define 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 int last_command_exit_value;
+extern char *dist_version, *release_status;
+extern char *shell_name;
+extern char *primary_prompt, *secondary_prompt;
+extern char *current_host_name;
+extern sh_builtin_func_t *this_shell_builtin;
+extern SHELL_VAR *this_shell_function;
+extern char *the_printed_command_except_trap;
+extern char *this_command_name;
+extern char *command_execution_string;
+extern time_t shell_start_time;
+extern int assigning_in_environment;
+extern int executing_builtin;
+extern int funcnest_max;
+
+#if defined (READLINE)
+extern int no_line_editing;
+extern int perform_hostname_completion;
+#endif
+
+/* The list of shell variables that the user has created at the global
+ scope, or that came from the environment. */
+VAR_CONTEXT *global_variables = (VAR_CONTEXT *)NULL;
+
+/* The current list of shell variables, including function scopes */
+VAR_CONTEXT *shell_variables = (VAR_CONTEXT *)NULL;
+
+/* The list of shell functions that the user has created, or that came from
+ the environment. */
+HASH_TABLE *shell_functions = (HASH_TABLE *)NULL;
+
+#if defined (DEBUGGER)
+/* The table of shell function definitions that the user defined or that
+ came from the environment. */
+HASH_TABLE *shell_function_defs = (HASH_TABLE *)NULL;
+#endif
+
+/* The current variable context. This is really a count of how deep into
+ executing functions we are. */
+int variable_context = 0;
+
+/* The set of shell assignments which are made only in the environment
+ for a single command. */
+HASH_TABLE *temporary_env = (HASH_TABLE *)NULL;
+
+/* Set to non-zero if an assignment error occurs while putting variables
+ into the temporary environment. */
+int tempenv_assign_error;
+
+/* Some funky variables which are known about specially. Here is where
+ "$*", "$1", and all the cruft is kept. */
+char *dollar_vars[10];
+WORD_LIST *rest_of_args = (WORD_LIST *)NULL;
+
+/* The value of $$. */
+pid_t dollar_dollar_pid;
+
+/* Non-zero means that we have to remake EXPORT_ENV. */
+int array_needs_making = 1;
+
+/* The number of times BASH has been executed. This is set
+ by initialize_variables (). */
+int shell_level = 0;
+
+/* An array which is passed to commands as their environment. It is
+ manufactured from the union of the initial environment and the
+ shell variables that are marked for export. */
+char **export_env = (char **)NULL;
+static int export_env_index;
+static int export_env_size;
+
+#if defined (READLINE)
+static int winsize_assignment; /* currently assigning to LINES or COLUMNS */
+#endif
+
+static HASH_TABLE *last_table_searched; /* hash_lookup sets this */
+
+/* Some forward declarations. */
+static void create_variable_tables __P((void));
+
+static void set_machine_vars __P((void));
+static void set_home_var __P((void));
+static void set_shell_var __P((void));
+static char *get_bash_name __P((void));
+static void initialize_shell_level __P((void));
+static void uidset __P((void));
+#if defined (ARRAY_VARS)
+static void make_vers_array __P((void));
+#endif
+
+static SHELL_VAR *null_assign __P((SHELL_VAR *, char *, arrayind_t, char *));
+#if defined (ARRAY_VARS)
+static SHELL_VAR *null_array_assign __P((SHELL_VAR *, char *, arrayind_t, char *));
+#endif
+static SHELL_VAR *get_self __P((SHELL_VAR *));
+
+#if defined (ARRAY_VARS)
+static SHELL_VAR *init_dynamic_array_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
+static SHELL_VAR *init_dynamic_assoc_var __P((char *, sh_var_value_func_t *, sh_var_assign_func_t *, int));
+#endif
+
+static SHELL_VAR *assign_seconds __P((SHELL_VAR *, char *, arrayind_t, char *));
+static SHELL_VAR *get_seconds __P((SHELL_VAR *));
+static SHELL_VAR *init_seconds_var __P((void));
+
+static int brand __P((void));
+static void sbrand __P((unsigned long)); /* set bash random number generator. */
+static void seedrand __P((void)); /* seed generator randomly */
+static SHELL_VAR *assign_random __P((SHELL_VAR *, char *, arrayind_t, char *));
+static SHELL_VAR *get_random __P((SHELL_VAR *));
+
+static SHELL_VAR *assign_lineno __P((SHELL_VAR *, char *, arrayind_t, char *));
+static SHELL_VAR *get_lineno __P((SHELL_VAR *));
+
+static SHELL_VAR *assign_subshell __P((SHELL_VAR *, char *, arrayind_t, char *));
+static SHELL_VAR *get_subshell __P((SHELL_VAR *));
+
+static SHELL_VAR *get_bashpid __P((SHELL_VAR *));
+
+#if defined (HISTORY)
+static SHELL_VAR *get_histcmd __P((SHELL_VAR *));
+#endif
+
+#if defined (READLINE)
+static SHELL_VAR *get_comp_wordbreaks __P((SHELL_VAR *));
+static SHELL_VAR *assign_comp_wordbreaks __P((SHELL_VAR *, char *, arrayind_t, char *));
+#endif
+
+#if defined (PUSHD_AND_POPD) && defined (ARRAY_VARS)
+static SHELL_VAR *assign_dirstack __P((SHELL_VAR *, char *, arrayind_t, char *));
+static SHELL_VAR *get_dirstack __P((SHELL_VAR *));
+#endif
+
+#if defined (ARRAY_VARS)
+static SHELL_VAR *get_groupset __P((SHELL_VAR *));
+
+static SHELL_VAR *build_hashcmd __P((SHELL_VAR *));
+static SHELL_VAR *get_hashcmd __P((SHELL_VAR *));
+static SHELL_VAR *assign_hashcmd __P((SHELL_VAR *, char *, arrayind_t, char *));
+# if defined (ALIAS)
+static SHELL_VAR *build_aliasvar __P((SHELL_VAR *));
+static SHELL_VAR *get_aliasvar __P((SHELL_VAR *));
+static SHELL_VAR *assign_aliasvar __P((SHELL_VAR *, char *, arrayind_t, char *));
+# endif
+#endif
+
+static SHELL_VAR *get_funcname __P((SHELL_VAR *));
+static SHELL_VAR *init_funcname_var __P((void));
+
+static void initialize_dynamic_variables __P((void));
+
+static SHELL_VAR *hash_lookup __P((const char *, HASH_TABLE *));
+static SHELL_VAR *new_shell_variable __P((const char *));
+static SHELL_VAR *make_new_variable __P((const char *, HASH_TABLE *));
+static SHELL_VAR *bind_variable_internal __P((const char *, char *, HASH_TABLE *, int, int));
+
+static void dispose_variable_value __P((SHELL_VAR *));
+static void free_variable_hash_data __P((PTR_T));
+
+static VARLIST *vlist_alloc __P((int));
+static VARLIST *vlist_realloc __P((VARLIST *, int));
+static void vlist_add __P((VARLIST *, SHELL_VAR *, int));
+
+static void flatten __P((HASH_TABLE *, sh_var_map_func_t *, VARLIST *, int));
+
+static int qsort_var_comp __P((SHELL_VAR **, SHELL_VAR **));
+
+static SHELL_VAR **vapply __P((sh_var_map_func_t *));
+static SHELL_VAR **fapply __P((sh_var_map_func_t *));
+
+static int visible_var __P((SHELL_VAR *));
+static int visible_and_exported __P((SHELL_VAR *));
+static int export_environment_candidate __P((SHELL_VAR *));
+static int local_and_exported __P((SHELL_VAR *));
+static int variable_in_context __P((SHELL_VAR *));
+#if defined (ARRAY_VARS)
+static int visible_array_vars __P((SHELL_VAR *));
+#endif
+
+static SHELL_VAR *find_nameref_at_context __P((SHELL_VAR *, VAR_CONTEXT *));
+static SHELL_VAR *find_variable_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
+static SHELL_VAR *find_variable_last_nameref_context __P((SHELL_VAR *, VAR_CONTEXT *, VAR_CONTEXT **));
+
+static SHELL_VAR *bind_tempenv_variable __P((const char *, char *));
+static void push_temp_var __P((PTR_T));
+static void propagate_temp_var __P((PTR_T));
+static void dispose_temporary_env __P((sh_free_func_t *));
+
+static inline char *mk_env_string __P((const char *, const char *, int));
+static char **make_env_array_from_var_list __P((SHELL_VAR **));
+static char **make_var_export_array __P((VAR_CONTEXT *));
+static char **make_func_export_array __P((void));
+static void add_temp_array_to_env __P((char **, int, int));
+
+static int n_shell_variables __P((void));
+static int set_context __P((SHELL_VAR *));
+
+static void push_func_var __P((PTR_T));
+static void push_exported_var __P((PTR_T));
+
+static inline int find_special_var __P((const char *));
+
+static void
+create_variable_tables ()
+{
+ if (shell_variables == 0)
+ {
+ shell_variables = global_variables = new_var_context ((char *)NULL, 0);
+ shell_variables->scope = 0;
+ shell_variables->table = hash_create (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, ro;
+ 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, though we still allow them to be defined as shell
+ variables. */
+ if (absolute_program (tname) == 0 && (posixly_correct == 0 || legal_identifier (tname)))
+ parse_and_execute (temp_string, tname, SEVAL_NONINT|SEVAL_NOHIST|SEVAL_FUNCDEF|SEVAL_ONECMD);
+
+ if (temp_var = find_function (tname))
+ {
+ VSETATTR (temp_var, (att_exported|att_imported));
+ array_needs_making = 1;
+ }
+ else
+ {
+ if (temp_var = bind_variable (name, string, 0))
+ {
+ VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
+ array_needs_making = 1;
+ }
+ last_command_exit_value = 1;
+ report_error (_("error importing function definition for `%s'"), tname);
+ }
+
+ /* Restore original suffix */
+ tname[namelen] = BASHFUNC_SUFFIX[0];
+ }
+#if defined (ARRAY_VARS)
+# if ARRAY_EXPORT
+ /* 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 /* ARRAY_EXPORT */
+#endif
+#if 0
+ else if (legal_identifier (name))
+#else
+ else
+#endif
+ {
+ ro = 0;
+ if (posixly_correct && STREQ (name, "SHELLOPTS"))
+ {
+ temp_var = find_variable ("SHELLOPTS");
+ ro = temp_var && readonly_p (temp_var);
+ if (temp_var)
+ VUNSETATTR (temp_var, att_readonly);
+ }
+ temp_var = bind_variable (name, string, 0);
+ if (temp_var)
+ {
+ if (legal_identifier (name))
+ VSETATTR (temp_var, (att_exported | att_imported));
+ else
+ VSETATTR (temp_var, (att_exported | att_imported | att_invisible));
+ if (ro)
+ VSETATTR (temp_var, att_readonly);
+ array_needs_making = 1;
+ }
+ }
+
+ name[char_index] = '=';
+ /* temp_var can be NULL if it was an exported function with a syntax
+ error (a different bug, but it still shouldn't dump core). */
+ if (temp_var && function_p (temp_var) == 0) /* XXX not yet */
+ {
+ CACHE_IMPORTSTR (temp_var, name);
+ }
+ }
+
+ set_pwd ();
+
+ /* Set up initial value of $_ */
+ temp_var = set_if_not ("_", dollar_vars[0]);
+
+ /* Remember this pid. */
+ dollar_dollar_pid = getpid ();
+
+ /* Now make our own defaults in case the vars that we think are
+ important are missing. */
+ temp_var = set_if_not ("PATH", DEFAULT_PATH_VALUE);
+#if 0
+ set_auto_export (temp_var); /* XXX */
+#endif
+
+ temp_var = set_if_not ("TERM", "dumb");
+#if 0
+ set_auto_export (temp_var); /* XXX */
+#endif
+
+#if defined (__QNX__)
+ /* set node id -- don't import it from the environment */
+ {
+ char node_name[22];
+# if defined (__QNXNTO__)
+ netmgr_ndtostr(ND2S_LOCAL_STR, ND_LOCAL_NODE, node_name, sizeof(node_name));
+# else
+ qnx_nidtostr (getnid (), node_name, sizeof (node_name));
+# endif
+ temp_var = bind_variable ("NODE", node_name, 0);
+ 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);
+ }
+#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. Initialize 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);
+ /* If we find the name in HASHED_VARS, set LAST_TABLE_SEARCHED to that
+ table. */
+ if (bucket)
+ last_table_searched = hashed_vars;
+ 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_CONTEXT *vc;
+
+ 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);
+
+ vc = shell_variables;
+#if 0
+if (search_tempenv == 0 && /* (subshell_environment & SUBSHELL_COMSUB) && */
+ expanding_redir &&
+ (this_shell_builtin == eval_builtin || this_shell_builtin == command_builtin))
+ {
+ itrace("find_variable_internal: search_tempenv == 0: skipping VC_BLTNENV");
+ while (vc && (vc->flags & VC_BLTNENV))
+ vc = vc->down;
+ if (vc == 0)
+ vc = shell_variables;
+ }
+#endif
+
+ if (var == 0)
+ var = var_lookup (name, vc);
+
+ if (var == 0)
+ return ((SHELL_VAR *)NULL);
+
+ return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
+}
+
+/* Look up and resolve the chain of nameref variables starting at V all the
+ way to NULL or non-nameref. */
+SHELL_VAR *
+find_variable_nameref (v)
+ SHELL_VAR *v;
+{
+ int level;
+ char *newname;
+ SHELL_VAR *orig, *oldv;
+
+ level = 0;
+ orig = v;
+ while (v && nameref_p (v))
+ {
+ level++;
+ if (level > NAMEREF_MAX)
+ return ((SHELL_VAR *)0); /* error message here? */
+ newname = nameref_cell (v);
+ if (newname == 0 || *newname == '\0')
+ return ((SHELL_VAR *)0);
+ oldv = v;
+ v = find_variable_internal (newname, (expanding_redir == 0 && (assigning_in_environment || executing_builtin)));
+ if (v == orig || v == oldv)
+ {
+ internal_warning (_("%s: circular name reference"), orig->name);
+ return ((SHELL_VAR *)0);
+ }
+ }
+ return v;
+}
+
+/* Resolve the chain of nameref variables for NAME. XXX - could change later */
+SHELL_VAR *
+find_variable_last_nameref (name)
+ const char *name;
+{
+ SHELL_VAR *v, *nv;
+ char *newname;
+ int level;
+
+ nv = v = find_variable_noref (name);
+ level = 0;
+ while (v && nameref_p (v))
+ {
+ level++;
+ if (level > NAMEREF_MAX)
+ return ((SHELL_VAR *)0); /* error message here? */
+ newname = nameref_cell (v);
+ if (newname == 0 || *newname == '\0')
+ return ((SHELL_VAR *)0);
+ nv = v;
+ v = find_variable_internal (newname, (expanding_redir == 0 && (assigning_in_environment || executing_builtin)));
+ }
+ return nv;
+}
+
+/* Resolve the chain of nameref variables for NAME. XXX - could change later */
+SHELL_VAR *
+find_global_variable_last_nameref (name)
+ const char *name;
+{
+ SHELL_VAR *v, *nv;
+ char *newname;
+ int level;
+
+ nv = v = find_global_variable_noref (name);
+ level = 0;
+ while (v && nameref_p (v))
+ {
+ level++;
+ if (level > NAMEREF_MAX)
+ return ((SHELL_VAR *)0); /* error message here? */
+ newname = nameref_cell (v);
+ if (newname == 0 || *newname == '\0')
+ return ((SHELL_VAR *)0);
+ nv = v;
+ v = find_global_variable_noref (newname);
+ }
+ return nv;
+}
+
+static SHELL_VAR *
+find_nameref_at_context (v, vc)
+ SHELL_VAR *v;
+ VAR_CONTEXT *vc;
+{
+ SHELL_VAR *nv, *nv2;
+ VAR_CONTEXT *nvc;
+ char *newname;
+ int level;
+
+ nv = v;
+ level = 1;
+ while (nv && nameref_p (nv))
+ {
+ level++;
+ if (level > NAMEREF_MAX)
+ return ((SHELL_VAR *)NULL);
+ newname = nameref_cell (nv);
+ if (newname == 0 || *newname == '\0')
+ return ((SHELL_VAR *)NULL);
+ nv2 = hash_lookup (newname, vc->table);
+ if (nv2 == 0)
+ break;
+ nv = nv2;
+ }
+ return nv;
+}
+
+/* Do nameref resolution from the VC, which is the local context for some
+ function or builtin, `up' the chain to the global variables context. If
+ NVCP is not NULL, return the variable context where we finally ended the
+ nameref resolution (so the bind_variable_internal can use the correct
+ variable context and hash table). */
+static SHELL_VAR *
+find_variable_nameref_context (v, vc, nvcp)
+ SHELL_VAR *v;
+ VAR_CONTEXT *vc;
+ VAR_CONTEXT **nvcp;
+{
+ SHELL_VAR *nv, *nv2;
+ VAR_CONTEXT *nvc;
+
+ /* Look starting at the current context all the way `up' */
+ for (nv = v, nvc = vc; nvc; nvc = nvc->down)
+ {
+ nv2 = find_nameref_at_context (nv, nvc);
+ if (nv2 == 0)
+ continue;
+ nv = nv2;
+ if (*nvcp)
+ *nvcp = nvc;
+ if (nameref_p (nv) == 0)
+ break;
+ }
+ return (nameref_p (nv) ? (SHELL_VAR *)NULL : nv);
+}
+
+/* Do nameref resolution from the VC, which is the local context for some
+ function or builtin, `up' the chain to the global variables context. If
+ NVCP is not NULL, return the variable context where we finally ended the
+ nameref resolution (so the bind_variable_internal can use the correct
+ variable context and hash table). */
+static SHELL_VAR *
+find_variable_last_nameref_context (v, vc, nvcp)
+ SHELL_VAR *v;
+ VAR_CONTEXT *vc;
+ VAR_CONTEXT **nvcp;
+{
+ SHELL_VAR *nv, *nv2;
+ VAR_CONTEXT *nvc;
+
+ /* Look starting at the current context all the way `up' */
+ for (nv = v, nvc = vc; nvc; nvc = nvc->down)
+ {
+ nv2 = find_nameref_at_context (nv, nvc);
+ if (nv2 == 0)
+ continue;
+ nv = nv2;
+ if (*nvcp)
+ *nvcp = nvc;
+ }
+ return (nameref_p (nv) ? nv : (SHELL_VAR *)NULL);
+}
+
+/* Find a variable, forcing a search of the temporary environment first */
+SHELL_VAR *
+find_variable_tempenv (name)
+ const char *name;
+{
+ SHELL_VAR *var;
+
+ var = find_variable_internal (name, 1);
+ if (var && nameref_p (var))
+ var = find_variable_nameref (var);
+ return (var);
+}
+
+/* Find a variable, not forcing a search of the temporary environment first */
+SHELL_VAR *
+find_variable_notempenv (name)
+ const char *name;
+{
+ SHELL_VAR *var;
+
+ var = find_variable_internal (name, 0);
+ if (var && nameref_p (var))
+ var = find_variable_nameref (var);
+ return (var);
+}
+
+SHELL_VAR *
+find_global_variable (name)
+ const char *name;
+{
+ SHELL_VAR *var;
+
+ var = var_lookup (name, global_variables);
+ if (var && nameref_p (var))
+ var = find_variable_nameref (var);
+
+ if (var == 0)
+ return ((SHELL_VAR *)NULL);
+
+ return (var->dynamic_value ? (*(var->dynamic_value)) (var) : var);
+}
+
+SHELL_VAR *
+find_global_variable_noref (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);
+}
+
+SHELL_VAR *
+find_shell_variable (name)
+ const char *name;
+{
+ SHELL_VAR *var;
+
+ var = var_lookup (name, shell_variables);
+ if (var && nameref_p (var))
+ var = find_variable_nameref (var);
+
+ 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;
+{
+ SHELL_VAR *v;
+
+ last_table_searched = 0;
+ v = find_variable_internal (name, (expanding_redir == 0 && (assigning_in_environment || executing_builtin)));
+ if (v && nameref_p (v))
+ v = find_variable_nameref (v);
+ return v;
+}
+
+SHELL_VAR *
+find_variable_noref (name)
+ const char *name;
+{
+ SHELL_VAR *v;
+
+ v = find_variable_internal (name, (expanding_redir == 0 && (assigning_in_environment || executing_builtin)));
+ return v;
+}
+
+/* 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)
+ return (old_var);
+
+ was_tmpvar = old_var && tempvar_p (old_var);
+ /* If we're making a local variable in a shell function, the temporary env
+ has already been merged into the function's variable context stack. We
+ can assume that a temporary var in the same context appears in the same
+ VAR_CONTEXT and can safely be returned without creating a new variable
+ (which results in duplicate names in the same VAR_CONTEXT->table */
+ /* We can't just test tmpvar_p because variables in the temporary env given
+ to a shell function appear in the function's local variable VAR_CONTEXT
+ but retain their tempvar attribute. We want temporary variables that are
+ found in temporary_env, hence the test for last_table_searched, which is
+ set in hash_lookup and only (so far) checked here. */
+ if (was_tmpvar && old_var->context == variable_context && last_table_searched != temporary_env)
+ {
+ VUNSETATTR (old_var, att_invisible);
+ return (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);
+ else if (noassign_p (old_var))
+ builtin_error (_("%s: variable may not be assigned value"), name);
+#if 0
+ /* Let noassign variables through with a warning */
+ if (readonly_p (old_var))
+#endif
+ 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'. XXX - see above for temporary env
+ variables with the same context level as variable_context */
+ /* XXX - we should only do this if the variable is not an array. */
+ 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);
+
+ if (was_tmpvar == 0)
+ VSETATTR (new_var, att_invisible); /* XXX */
+ 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 responsibility 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, assoc_ok)
+ char *name;
+ int assoc_ok;
+{
+ SHELL_VAR *var;
+ ARRAY *array;
+
+ var = make_local_variable (name);
+ if (var == 0 || array_p (var) || (assoc_ok && assoc_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);
+ }
+ /* This can be fooled if the variable's value changes while evaluating
+ `rval'. We can change it if we move the evaluation of lval to here. */
+ 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);
+ /* Follow the nameref chain here if this is the global variables table */
+ if (entry && nameref_p (entry) && (invisible_p (entry) == 0) && table == global_variables->table)
+ {
+ entry = find_global_variable (entry->name);
+ /* Let's see if we have a nameref referencing a variable that hasn't yet
+ been created. */
+ if (entry == 0)
+ entry = find_variable_last_nameref (name); /* XXX */
+ if (entry == 0) /* just in case */
+ return (entry);
+ }
+
+ /* The first clause handles `declare -n ref; ref=x;' */
+ if (entry && invisible_p (entry) && nameref_p (entry))
+ goto assign_value;
+ else if (entry && nameref_p (entry))
+ {
+ newval = nameref_cell (entry);
+#if defined (ARRAY_VARS)
+ /* declare -n foo=x[2] */
+ if (valid_array_reference (newval))
+ /* XXX - should it be aflags? */
+ entry = assign_array_element (newval, make_variable_value (entry, value, 0), aflags);
+ else
+#endif
+ {
+ entry = make_new_variable (newval, table);
+ var_setvalue (entry, make_variable_value (entry, value, 0));
+ }
+ }
+ else 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
+ {
+assign_value:
+ 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);
+
+#if defined (ARRAY_VARS)
+ if (assoc_p (entry) || array_p (entry))
+ newval = make_array_variable_value (entry, 0, "0", value, aflags);
+ else
+#endif
+
+ 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 (assoc_p (entry))
+ {
+ assoc_insert (assoc_cell (entry), savestring ("0"), newval);
+ free (newval);
+ }
+ else if (array_p (entry))
+ {
+ array_insert (array_cell (entry), 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, *nv;
+ VAR_CONTEXT *vc, *nvc;
+ int level;
+
+ 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);
+ nvc = vc;
+ if (v && nameref_p (v))
+ {
+ nv = find_variable_nameref_context (v, vc, &nvc);
+ if (nv == 0)
+ {
+ nv = find_variable_last_nameref_context (v, vc, &nvc);
+ if (nv && nameref_p (nv))
+ {
+ /* If this nameref variable doesn't have a value yet,
+ set the value. Otherwise, assign using the value as
+ normal. */
+ if (nameref_cell (nv) == 0)
+ return (bind_variable_internal (nv->name, value, nvc->table, 0, flags));
+ return (bind_variable_internal (nameref_cell (nv), value, nvc->table, 0, flags));
+ }
+ else
+ v = nv;
+ }
+ else
+ v = nv;
+ }
+ if (v)
+ return (bind_variable_internal (v->name, value, nvc->table, 0, flags));
+ }
+ }
+ /* bind_variable_internal will handle nameref resolution in this case */
+ return (bind_variable_internal (name, value, global_variables->table, 0, flags));
+}
+
+SHELL_VAR *
+bind_global_variable (name, value, flags)
+ const char *name;
+ char *value;
+ int flags;
+{
+ SHELL_VAR *v, *nv;
+ VAR_CONTEXT *vc, *nvc;
+ int level;
+
+ if (shell_variables == 0)
+ create_variable_tables ();
+
+ /* bind_variable_internal will handle nameref resolution in this case */
+ 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;
+ int invis;
+
+ invis = invisible_p (var);
+ 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);
+#if defined (ARRAY_VARS)
+ if ((aflags & ASS_NAMEREF) && (t == 0 || *t == 0 || (legal_identifier (t) == 0 && valid_array_reference (t) == 0)))
+#else
+ if ((aflags & ASS_NAMEREF) && (t == 0 || *t == 0 || legal_identifier (t) == 0))
+#endif
+ {
+ free (t);
+ if (invis)
+ VSETATTR (var, att_invisible); /* XXX */
+ return ((SHELL_VAR *)NULL);
+ }
+ 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, implicitarray;
+
+ isint = isarr = implicitarray = 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 (array_p (v) && isarr == 0)
+ implicitarray = 1;
+#endif
+ }
+
+#if defined (ARRAY_VARS)
+ if (isarr)
+ v = assign_array_element (lhs, rhs, 0);
+ else if (implicitarray)
+ v = bind_array_variable (lhs, 0, rhs, 0);
+ else
+#endif
+ v = bind_variable (lhs, rhs, 0);
+
+ if (v && isint)
+ VSETATTR (v, att_integer);
+
+ VUNSETATTR (v, att_invisible);
+
+ 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, aflags;
+ char *name, *temp, *value;
+ SHELL_VAR *var;
+ const char *string;
+
+ string = word->word;
+
+ aflags = 0;
+ offset = assignment (string, 0);
+ name = savestring (string);
+ value = (char *)NULL;
+
+ if (name[offset] == '=')
+ {
+ name[offset] = 0;
+
+ /* don't ignore the `+' when assigning temporary environment */
+ if (name[offset - 1] == '+')
+ {
+ name[offset - 1] = '\0';
+ aflags |= ASS_APPEND;
+ }
+
+ 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 (var && (aflags & ASS_APPEND))
+ {
+ temp = make_variable_value (var, value, aflags);
+ FREE (value);
+ value = temp;
+ }
+ }
+
+ 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 (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 (nameref_cell (var)) /* XXX - nameref */
+ var_setref (copy, savestring (nameref_cell (var)));
+ else if (value_cell (var)) /* XXX - nameref */
+ 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 if (nameref_p (var))
+ FREE (nameref_cell (var));
+ 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. Unsetting a nameref variable
+ unsets the variable it resolves to but leaves the nameref alone. */
+int
+unbind_variable (name)
+ const char *name;
+{
+ SHELL_VAR *v, *nv;
+ int r;
+
+ v = var_lookup (name, shell_variables);
+ nv = (v && nameref_p (v)) ? find_variable_nameref (v) : (SHELL_VAR *)NULL;
+
+ r = nv ? makunbound (nv->name, shell_variables) : makunbound (name, shell_variables);
+ return r;
+}
+
+/* Unbind NAME, where NAME is assumed to be a nameref variable */
+int
+unbind_nameref (name)
+ const char *name;
+{
+ SHELL_VAR *v;
+
+ v = var_lookup (name, shell_variables);
+ if (v && nameref_p (v))
+ return makunbound (name, shell_variables);
+ return 0;
+}
+
+/* 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 */
+
+int
+delete_var (name, vc)
+ const char *name;
+ VAR_CONTEXT *vc;
+{
+ BUCKET_CONTENTS *elt;
+ SHELL_VAR *old_var;
+ VAR_CONTEXT *v;
+
+ 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;
+ free (elt->key);
+ free (elt);
+
+ dispose_variable (old_var);
+ return (0);
+}
+
+/* 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 if (nameref_p (old_var))
+ FREE (nameref_cell (old_var));
+ 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 ARRAY_EXPORT
+ value = array_to_assignment_string (array_cell (var));
+# else
+ continue; /* XXX array vars cannot yet be exported */
+# endif /* ARRAY_EXPORT */
+ 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;
+}
+
+int
+chkexport (name)
+ char *name;
+{
+ SHELL_VAR *v;
+
+ v = find_variable (name);
+ if (v && exported_p (v))
+ {
+ array_needs_making = 1;
+ maybe_make_export_env ();
+ return 1;
+ }
+ return 0;
+}
+
+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);
+}
+
+/* **************************************************************** */
+/* */
+/* 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_COMPAT", sv_shcompat },
+ { "BASH_XTRACEFD", sv_xtracefd },
+
+#if defined (JOB_CONTROL)
+ { "CHILD_MAX", sv_childmax },
+#endif
+
+#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)
+ { "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 (hmax < 0 && name[4] == 'S')
+ unstifle_history (); /* unstifle history if HISTSIZE < 0 */
+ else if (name[4] == 'S')
+ {
+ stifle_history (hmax);
+ hmax = where_history ();
+ if (history_lines_this_session > hmax)
+ history_lines_this_session = hmax;
+ }
+ else if (hmax >= 0) /* truncate HISTFILE if HISTFILESIZE >= 0 */
+ {
+ 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;
+
+ if (v = find_variable (name))
+ {
+ if (history_comment_char == 0)
+ history_comment_char = '#';
+ }
+ history_write_timestamps = (v != 0);
+}
+#endif /* HISTORY */
+
+#if defined (HAVE_TZSET)
+void
+sv_tz (name)
+ char *name;
+{
+ if (chkexport (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;
+ int r;
+
+ v = get_string_value (name);
+ if (name[0] == 'L' && name[1] == 'A') /* LANG */
+ r = set_lang (name, v);
+ else
+ r = set_locale_var (name, v); /* LC_*, TEXTDOMAIN* */
+
+#if 1
+ if (r == 0 && posixly_correct)
+ last_command_exit_value = 1;
+#endif
+}
+
+#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));
+ }
+}
+
+#define MIN_COMPAT_LEVEL 31
+
+void
+sv_shcompat (name)
+ char *name;
+{
+ SHELL_VAR *v;
+ char *val;
+ int tens, ones, compatval;
+
+ v = find_variable (name);
+ if (v == 0)
+ {
+ shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
+ set_compatibility_opts ();
+ return;
+ }
+ val = value_cell (v);
+ if (val == 0 || *val == '\0')
+ {
+ shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
+ set_compatibility_opts ();
+ return;
+ }
+ /* Handle decimal-like compatibility version specifications: 4.2 */
+ if (isdigit (val[0]) && val[1] == '.' && isdigit (val[2]) && val[3] == 0)
+ {
+ tens = val[0] - '0';
+ ones = val[2] - '0';
+ compatval = tens*10 + ones;
+ }
+ /* Handle integer-like compatibility version specifications: 42 */
+ else if (isdigit (val[0]) && isdigit (val[1]) && val[2] == 0)
+ {
+ tens = val[0] - '0';
+ ones = val[1] - '0';
+ compatval = tens*10 + ones;
+ }
+ else
+ {
+compat_error:
+ internal_error (_("%s: %s: compatibility value out of range"), name, val);
+ shell_compatibility_level = DEFAULT_COMPAT_LEVEL;
+ set_compatibility_opts ();
+ return;
+ }
+
+ if (compatval < MIN_COMPAT_LEVEL || compatval > DEFAULT_COMPAT_LEVEL)
+ goto compat_error;
+
+ shell_compatibility_level = compatval;
+ set_compatibility_opts ();
+}
+
+#if defined (JOB_CONTROL)
+void
+sv_childmax (name)
+ char *name;
+{
+ char *tt;
+ int s;
+
+ tt = get_string_value (name);
+ s = (tt && *tt) ? atoi (tt) : 0;
+ set_maxchild (s);
+}
+#endif
projects / thirdparty / bash.git / commitdiff
